Vendor OpenClaw source as Adolf fork baseline

Adolf is a fork/vendored clone of github.com/openclaw/openclaw (v2026.6.11),
free to diverge. Tree copied sans upstream .git; upstream remote added for
future syncs. Node pinned to 24 (.nvmrc); engines already require >=22.19.
Preserves docs/ARCHITECTURE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LeqyaxJF2nbRXJtae2kNB2

extensions/mattermost/README.md

@@ -0,0 +1,13 @@
+# Mattermost OpenClaw channel
+
+Official OpenClaw channel plugin for Mattermost.
+
+## Install
+
+```sh
+openclaw plugins install @openclaw/mattermost
+```
+
+## Docs
+
+See `docs/channels/mattermost.md` in the OpenClaw repository, or the published docs at `https://docs.openclaw.ai/channels/mattermost`.

extensions/mattermost/api.ts

@@ -0,0 +1,3 @@
+// Keep this barrel helper-only so plugin-sdk facades do not pull the full
+// channel plugin (and its runtime state) into tests or other shared surfaces.
+export { isMattermostSenderAllowed } from "./src/mattermost/monitor-auth.js";

extensions/mattermost/channel-plugin-api.ts

@@ -0,0 +1,4 @@
+// Keep bundled channel entry imports narrow so bootstrap/discovery paths do
+// not drag the broader Mattermost helper surfaces into lightweight plugin loads.
+export { mattermostPlugin } from "./channel-plugin-runtime.js";
+export { mattermostSetupPlugin } from "./src/channel.setup.js";

extensions/mattermost/channel-plugin-runtime.ts

@@ -0,0 +1,4 @@
+// Private runtime-bearing plugin export for the bundled Mattermost entry.
+// Keep the actual channel plugin value off the lighter channel-plugin-api seam
+// so bootstrap can lazy-load it without tripping bundle init cycles.
+export { mattermostPlugin } from "./src/channel.js";

extensions/mattermost/doctor-contract-api.ts

@@ -0,0 +1,2 @@
+// Mattermost API module exposes the plugin public contract.
+export { normalizeCompatibilityConfig, legacyConfigRules } from "./src/doctor-contract.js";

extensions/mattermost/gateway-auth-api.ts

@@ -0,0 +1,2 @@
+// Mattermost API module exposes the plugin public contract.
+export { resolveMattermostGatewayAuthBypassPaths as resolveGatewayAuthBypassPaths } from "./src/gateway-auth-bypass.js";

extensions/mattermost/index.ts

@@ -0,0 +1,38 @@
+// Mattermost plugin entrypoint registers its OpenClaw integration.
+import {
+  defineBundledChannelEntry,
+  loadBundledEntryExportSync,
+} from "openclaw/plugin-sdk/channel-entry-contract";
+import type { OpenClawPluginApi } from "openclaw/plugin-sdk/channel-entry-contract";
+
+function registerSlashCommandRoute(api: OpenClawPluginApi): void {
+  const register = loadBundledEntryExportSync<(api: OpenClawPluginApi) => void>(import.meta.url, {
+    specifier: "./slash-route-api.js",
+    exportName: "registerSlashCommandRoute",
+  });
+  register(api);
+}
+
+export default defineBundledChannelEntry({
+  id: "mattermost",
+  name: "Mattermost",
+  description: "Mattermost channel plugin",
+  importMetaUrl: import.meta.url,
+  plugin: {
+    specifier: "./channel-plugin-api.js",
+    exportName: "mattermostPlugin",
+  },
+  secrets: {
+    specifier: "./secret-contract-api.js",
+    exportName: "channelSecrets",
+  },
+  runtime: {
+    specifier: "./runtime-api.js",
+    exportName: "setMattermostRuntime",
+  },
+  registerFull(api) {
+    // Actual slash-command registration happens after the monitor connects and
+    // knows the team id; the route itself can be wired here.
+    registerSlashCommandRoute(api);
+  },
+});

extensions/mattermost/npm-shrinkwrap.json

@@ -0,0 +1,54 @@
+{
+  "name": "@openclaw/mattermost",
+  "version": "2026.6.11",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@openclaw/mattermost",
+      "version": "2026.6.11",
+      "dependencies": {
+        "ws": "8.21.0",
+        "zod": "4.4.3"
+      },
+      "peerDependencies": {
+        "openclaw": ">=2026.6.11"
+      },
+      "peerDependenciesMeta": {
+        "openclaw": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.21.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.0.tgz",
+      "integrity": "sha512-Vsp28b7DRcimFQvrqu2Wek3z1iYxDCWqHYB8Qsnk/S4RfaCQzPGPyBNuVjJV3cd6UiKtUtp6sNM77gWvzcCH+g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    }
+  }
+}

extensions/mattermost/openclaw.plugin.json

@@ -0,0 +1,16 @@
+{
+  "id": "mattermost",
+  "icon": "https://cdn.simpleicons.org/mattermost",
+  "activation": {
+    "onStartup": false
+  },
+  "channels": ["mattermost"],
+  "channelEnvVars": {
+    "mattermost": ["MATTERMOST_BOT_TOKEN", "MATTERMOST_URL"]
+  },
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {}
+  }
+}

extensions/mattermost/package.json

@@ -0,0 +1,59 @@
+{
+  "name": "@openclaw/mattermost",
+  "version": "2026.6.11",
+  "description": "OpenClaw Mattermost channel plugin",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/openclaw/openclaw"
+  },
+  "type": "module",
+  "dependencies": {
+    "ws": "8.21.0",
+    "zod": "4.4.3"
+  },
+  "devDependencies": {
+    "@openclaw/plugin-sdk": "workspace:*",
+    "openclaw": "workspace:*"
+  },
+  "peerDependencies": {
+    "openclaw": ">=2026.6.11"
+  },
+  "peerDependenciesMeta": {
+    "openclaw": {
+      "optional": true
+    }
+  },
+  "openclaw": {
+    "extensions": [
+      "./index.ts"
+    ],
+    "setupEntry": "./setup-entry.ts",
+    "channel": {
+      "id": "mattermost",
+      "label": "Mattermost",
+      "selectionLabel": "Mattermost (plugin)",
+      "docsPath": "/channels/mattermost",
+      "docsLabel": "mattermost",
+      "blurb": "self-hosted Slack-style chat; install the plugin to enable.",
+      "order": 65
+    },
+    "install": {
+      "clawhubSpec": "clawhub:@openclaw/mattermost",
+      "npmSpec": "@openclaw/mattermost",
+      "defaultChoice": "npm",
+      "minHostVersion": ">=2026.6.9",
+      "allowInvalidConfigRecovery": true
+    },
+    "compat": {
+      "pluginApi": ">=2026.6.11"
+    },
+    "build": {
+      "openclawVersion": "2026.6.11",
+      "bundledDist": false
+    },
+    "release": {
+      "publishToClawHub": true,
+      "publishToNpm": true
+    }
+  }
+}

extensions/mattermost/policy-api.ts

@@ -0,0 +1,2 @@
+// Mattermost API module exposes the plugin public contract.
+export { isMattermostSenderAllowed } from "./src/mattermost/monitor-auth.js";

extensions/mattermost/runtime-api.ts

@@ -0,0 +1,84 @@
+// Private runtime barrel for the bundled Mattermost extension.
+// Keep this barrel thin and generic-only.
+
+export type {
+  BaseProbeResult,
+  ChannelAccountSnapshot,
+  ChannelDirectoryEntry,
+  ChannelGroupContext,
+  ChannelMessageActionName,
+  ChannelPlugin,
+  ChatType,
+  HistoryEntry,
+  OpenClawConfig,
+  OpenClawPluginApi,
+  PluginRuntime,
+} from "openclaw/plugin-sdk/core";
+export type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
+export type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
+export type { ModelsProviderData } from "openclaw/plugin-sdk/models-provider-runtime";
+export type {
+  BlockStreamingCoalesceConfig,
+  DmPolicy,
+  GroupPolicy,
+} from "openclaw/plugin-sdk/config-contracts";
+export {
+  DEFAULT_ACCOUNT_ID,
+  buildChannelConfigSchema,
+  createDedupeCache,
+  parseStrictPositiveInteger,
+  resolveClientIp,
+  isTrustedProxyAddress,
+} from "openclaw/plugin-sdk/core";
+export { buildComputedAccountStatusSnapshot } from "openclaw/plugin-sdk/channel-status";
+export { createAccountStatusSink } from "openclaw/plugin-sdk/channel-outbound";
+export { buildAgentMediaPayload } from "openclaw/plugin-sdk/agent-media-payload";
+export {
+  listSkillCommandsForAgents,
+  resolveControlCommandGate,
+  resolveStoredModelOverride,
+} from "openclaw/plugin-sdk/command-auth-native";
+export { buildModelsProviderData } from "openclaw/plugin-sdk/models-provider-runtime";
+export {
+  GROUP_POLICY_BLOCKED_LABEL,
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveDefaultGroupPolicy,
+  warnMissingProviderGroupPolicyFallbackOnce,
+} from "openclaw/plugin-sdk/runtime-group-policy";
+export { isDangerousNameMatchingEnabled } from "openclaw/plugin-sdk/dangerous-name-runtime";
+export { resolveStorePath } from "openclaw/plugin-sdk/session-store-runtime";
+export { formatInboundFromLabel } from "openclaw/plugin-sdk/channel-inbound";
+export { logInboundDrop } from "openclaw/plugin-sdk/channel-inbound";
+export { createChannelPairingController } from "openclaw/plugin-sdk/channel-pairing";
+export { createChannelMessageReplyPipeline } from "openclaw/plugin-sdk/channel-outbound";
+export { logTypingFailure } from "openclaw/plugin-sdk/channel-feedback";
+export { loadOutboundMediaFromUrl } from "openclaw/plugin-sdk/outbound-media";
+export { rawDataToString } from "openclaw/plugin-sdk/webhook-ingress";
+export { chunkTextForOutbound } from "openclaw/plugin-sdk/text-chunking";
+// Legacy map-helper exports stay for older plugin consumers. New message-turn
+// code should use createChannelHistoryWindow.
+export {
+  DEFAULT_GROUP_HISTORY_LIMIT,
+  createChannelHistoryWindow,
+  buildPendingHistoryContextFromMap,
+  clearHistoryEntriesIfEnabled,
+  recordPendingHistoryEntryIfEnabled,
+} from "openclaw/plugin-sdk/reply-history";
+export { normalizeAccountId, resolveThreadSessionKeys } from "openclaw/plugin-sdk/routing";
+export { resolveAllowlistMatchSimple } from "openclaw/plugin-sdk/allow-from";
+export { registerPluginHttpRoute } from "openclaw/plugin-sdk/webhook-targets";
+export {
+  isRequestBodyLimitError,
+  readRequestBodyWithLimit,
+} from "openclaw/plugin-sdk/webhook-ingress";
+export {
+  applyAccountNameToChannelSection,
+  applySetupAccountConfigPatch,
+  migrateBaseNameToDefaultAccount,
+} from "openclaw/plugin-sdk/setup";
+export {
+  getAgentScopedMediaLocalRoots,
+  resolveChannelMediaMaxBytes,
+} from "openclaw/plugin-sdk/media-runtime";
+export { normalizeProviderId } from "openclaw/plugin-sdk/provider-model-shared";
+export { setMattermostRuntime } from "./src/runtime.js";

extensions/mattermost/secret-contract-api.ts

@@ -0,0 +1,6 @@
+// Mattermost API module exposes the plugin public contract.
+export {
+  channelSecrets,
+  collectRuntimeConfigAssignments,
+  secretTargetRegistryEntries,
+} from "./src/secret-contract.js";

extensions/mattermost/setup-entry.ts

@@ -0,0 +1,14 @@
+// Mattermost plugin module implements setup entry behavior.
+import { defineBundledChannelSetupEntry } from "openclaw/plugin-sdk/channel-entry-contract";
+
+export default defineBundledChannelSetupEntry({
+  importMetaUrl: import.meta.url,
+  plugin: {
+    specifier: "./channel-plugin-api.js",
+    exportName: "mattermostSetupPlugin",
+  },
+  secrets: {
+    specifier: "./secret-contract-api.js",
+    exportName: "channelSecrets",
+  },
+});

extensions/mattermost/slash-route-api.ts

@@ -0,0 +1,2 @@
+// Mattermost API module exposes the plugin public contract.
+export { registerSlashCommandRoute } from "./src/mattermost/slash-state.js";

extensions/mattermost/src/approval-auth.test.ts

@@ -0,0 +1,29 @@
+// Mattermost tests cover approval auth plugin behavior.
+import { describe, expect, it } from "vitest";
+import { mattermostApprovalAuth } from "./approval-auth.js";
+
+describe("mattermostApprovalAuth", () => {
+  it("authorizes stable Mattermost user ids and ignores usernames", () => {
+    expect(
+      mattermostApprovalAuth.authorizeActorAction({
+        cfg: {
+          channels: { mattermost: { allowFrom: ["user:abcdefghijklmnopqrstuvwxyz"] } },
+        },
+        senderId: "abcdefghijklmnopqrstuvwxyz",
+        action: "approve",
+        approvalKind: "exec",
+      }),
+    ).toEqual({ authorized: true });
+
+    expect(
+      mattermostApprovalAuth.authorizeActorAction({
+        cfg: {
+          channels: { mattermost: { allowFrom: ["@owner"] } },
+        },
+        senderId: "attacker-user-id",
+        action: "approve",
+        approvalKind: "exec",
+      }),
+    ).toEqual({ authorized: true });
+  });
+});

extensions/mattermost/src/approval-auth.ts

@@ -0,0 +1,31 @@
+// Mattermost plugin module implements approval auth behavior.
+import {
+  createResolvedApproverActionAuthAdapter,
+  resolveApprovalApprovers,
+} from "openclaw/plugin-sdk/approval-auth-runtime";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { resolveMattermostAccount } from "./mattermost/accounts.js";
+
+const MATTERMOST_USER_ID_RE = /^[a-z0-9]{26}$/;
+
+function normalizeMattermostApproverId(value: string | number): string | undefined {
+  const normalized = String(value)
+    .trim()
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .trim();
+  const lowered = normalizeLowercaseStringOrEmpty(normalized);
+  return MATTERMOST_USER_ID_RE.test(lowered) ? lowered : undefined;
+}
+
+export const mattermostApprovalAuth = createResolvedApproverActionAuthAdapter({
+  channelLabel: "Mattermost",
+  resolveApprovers: ({ cfg, accountId }) => {
+    const account = resolveMattermostAccount({ cfg, accountId }).config;
+    return resolveApprovalApprovers({
+      allowFrom: account.allowFrom,
+      normalizeApprover: normalizeMattermostApproverId,
+    });
+  },
+  normalizeSenderId: (value) => normalizeMattermostApproverId(value),
+});

extensions/mattermost/src/channel-actions-setup-status.contract.test.ts

@@ -0,0 +1,127 @@
+// Mattermost tests cover channel actions setup status.contract plugin behavior.
+import {
+  installChannelActionsContractSuite,
+  installChannelSetupContractSuite,
+  installChannelStatusContractSuite,
+} from "openclaw/plugin-sdk/channel-test-helpers";
+import type { OpenClawConfig } from "openclaw/plugin-sdk/config-contracts";
+import { describe, expect } from "vitest";
+import { mattermostPlugin, mattermostSetupPlugin } from "../channel-plugin-api.js";
+
+describe("mattermost actions contract", () => {
+  installChannelActionsContractSuite({
+    plugin: mattermostPlugin,
+    unsupportedAction: "poll",
+    cases: [
+      {
+        name: "configured account exposes send and react",
+        cfg: {
+          channels: {
+            mattermost: {
+              enabled: true,
+              botToken: "test-token",
+              baseUrl: "https://chat.example.com",
+            },
+          },
+        } as OpenClawConfig,
+        expectedActions: ["send", "react"],
+        expectedCapabilities: ["presentation"],
+      },
+      {
+        name: "reactions can be disabled while send stays available",
+        cfg: {
+          channels: {
+            mattermost: {
+              enabled: true,
+              botToken: "test-token",
+              baseUrl: "https://chat.example.com",
+              actions: { reactions: false },
+            },
+          },
+        } as OpenClawConfig,
+        expectedActions: ["send"],
+        expectedCapabilities: ["presentation"],
+      },
+      {
+        name: "missing bot credentials disables the actions surface",
+        cfg: {
+          channels: {
+            mattermost: {
+              enabled: true,
+            },
+          },
+        } as OpenClawConfig,
+        expectedActions: [],
+        expectedCapabilities: [],
+      },
+    ],
+  });
+});
+
+describe("mattermost setup contract", () => {
+  installChannelSetupContractSuite({
+    plugin: mattermostSetupPlugin,
+    cases: [
+      {
+        name: "default account stores token and normalized base URL",
+        cfg: {} as OpenClawConfig,
+        input: {
+          botToken: "test-token",
+          httpUrl: "https://chat.example.com/",
+        },
+        expectedAccountId: "default",
+        assertPatchedConfig: (cfg) => {
+          const mattermostConfig = cfg.channels?.mattermost;
+          if (!mattermostConfig) {
+            throw new Error("expected Mattermost config patch");
+          }
+          expect(mattermostConfig.enabled).toBe(true);
+          expect(mattermostConfig.botToken).toBe("test-token");
+          expect(mattermostConfig.baseUrl).toBe("https://chat.example.com");
+        },
+      },
+      {
+        name: "missing credentials are rejected",
+        cfg: {} as OpenClawConfig,
+        input: {
+          httpUrl: "",
+        },
+        expectedAccountId: "default",
+        expectedValidation: "Mattermost requires --bot-token and --http-url (or --use-env).",
+      },
+    ],
+  });
+});
+
+describe("mattermost status contract", () => {
+  installChannelStatusContractSuite({
+    plugin: mattermostPlugin,
+    cases: [
+      {
+        name: "configured account preserves connectivity details in the snapshot",
+        cfg: {
+          channels: {
+            mattermost: {
+              enabled: true,
+              botToken: "test-token",
+              baseUrl: "https://chat.example.com",
+            },
+          },
+        } as OpenClawConfig,
+        runtime: {
+          accountId: "default",
+          connected: true,
+          lastConnectedAt: 1234,
+        },
+        probe: { ok: true },
+        assertSnapshot: (snapshot) => {
+          expect(snapshot.accountId).toBe("default");
+          expect(snapshot.enabled).toBe(true);
+          expect(snapshot.configured).toBe(true);
+          expect(snapshot.connected).toBe(true);
+          expect(snapshot.baseUrl).toBe("https://chat.example.com");
+        },
+      },
+    ],
+  });
+});

extensions/mattermost/src/channel-api.ts

@@ -0,0 +1,5 @@
+// Mattermost API module exposes the plugin public contract.
+export { createAccountStatusSink } from "openclaw/plugin-sdk/channel-outbound";
+export type { ChannelPlugin } from "openclaw/plugin-sdk/core";
+export { DEFAULT_ACCOUNT_ID } from "openclaw/plugin-sdk/core";
+export { chunkTextForOutbound } from "openclaw/plugin-sdk/text-chunking";

extensions/mattermost/src/channel-config-shared.ts

@@ -0,0 +1,80 @@
+// Mattermost helper module supports channel config shared behavior.
+import { describeAccountSnapshot } from "openclaw/plugin-sdk/account-helpers";
+import { formatNormalizedAllowFromEntries } from "openclaw/plugin-sdk/allow-from";
+import {
+  adaptScopedAccountAccessor,
+  createScopedChannelConfigAdapter,
+} from "openclaw/plugin-sdk/channel-config-helpers";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { resolveMattermostGatewayAuthBypassPaths } from "./gateway-auth-bypass.js";
+import {
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  type ResolvedMattermostAccount,
+} from "./mattermost/accounts.js";
+
+export const mattermostMeta = {
+  id: "mattermost",
+  label: "Mattermost",
+  selectionLabel: "Mattermost (plugin)",
+  detailLabel: "Mattermost Bot",
+  docsPath: "/channels/mattermost",
+  docsLabel: "mattermost",
+  blurb: "self-hosted Slack-style chat; install the plugin to enable.",
+  systemImage: "bubble.left.and.bubble.right",
+  order: 65,
+  quickstartAllowFrom: true,
+} as const;
+
+export function normalizeMattermostAllowEntry(entry: string): string {
+  return normalizeLowercaseStringOrEmpty(
+    entry
+      .trim()
+      .replace(/^(mattermost|user):/i, "")
+      .replace(/^@/, ""),
+  );
+}
+
+function formatMattermostAllowEntry(entry: string): string {
+  const trimmed = entry.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed.startsWith("@")) {
+    const username = trimmed.slice(1).trim();
+    return username ? `@${normalizeLowercaseStringOrEmpty(username)}` : "";
+  }
+  return normalizeLowercaseStringOrEmpty(trimmed.replace(/^(mattermost|user):/i, ""));
+}
+
+export { resolveMattermostGatewayAuthBypassPaths };
+
+export const mattermostConfigAdapter = createScopedChannelConfigAdapter<ResolvedMattermostAccount>({
+  sectionKey: "mattermost",
+  listAccountIds: listMattermostAccountIds,
+  resolveAccount: adaptScopedAccountAccessor(resolveMattermostAccount),
+  defaultAccountId: resolveDefaultMattermostAccountId,
+  clearBaseFields: ["botToken", "baseUrl", "name"],
+  resolveAllowFrom: (account) => account.config.allowFrom,
+  formatAllowFrom: (allowFrom) =>
+    formatNormalizedAllowFromEntries({
+      allowFrom,
+      normalizeEntry: formatMattermostAllowEntry,
+    }),
+});
+
+export function isMattermostConfigured(account: ResolvedMattermostAccount): boolean {
+  return Boolean(account.botToken && account.baseUrl);
+}
+
+export function describeMattermostAccount(account: ResolvedMattermostAccount) {
+  return describeAccountSnapshot({
+    account,
+    configured: isMattermostConfigured(account),
+    extra: {
+      botTokenSource: account.botTokenSource,
+      baseUrl: account.baseUrl,
+    },
+  });
+}

extensions/mattermost/src/channel.message-adapter.test.ts

@@ -0,0 +1,256 @@
+// Mattermost tests cover channel.message adapter plugin behavior.
+import {
+  verifyChannelMessageAdapterCapabilityProofs,
+  verifyChannelMessageLiveCapabilityAdapterProofs,
+  verifyChannelMessageLiveFinalizerProofs,
+} from "openclaw/plugin-sdk/channel-outbound";
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const sendMessageMattermostMock = vi.hoisted(() => vi.fn());
+
+vi.mock("./mattermost/send.js", () => ({
+  sendMessageMattermost: sendMessageMattermostMock,
+}));
+
+import { mattermostPlugin } from "./channel.js";
+
+type MattermostMessageAdapter = NonNullable<typeof mattermostPlugin.message>;
+type MattermostMessageSender = NonNullable<MattermostMessageAdapter["send"]>;
+
+function requireMattermostMessageAdapter(): MattermostMessageAdapter {
+  const adapter = mattermostPlugin.message;
+  if (!adapter) {
+    throw new Error("Expected mattermost plugin to expose a channel message adapter");
+  }
+  return adapter;
+}
+
+function requireTextSender(
+  adapter: MattermostMessageAdapter,
+): NonNullable<MattermostMessageSender["text"]> {
+  const text = adapter.send?.text;
+  if (!text) {
+    throw new Error("Expected mattermost message adapter text sender");
+  }
+  return text;
+}
+
+function requireMediaSender(
+  adapter: MattermostMessageAdapter,
+): NonNullable<MattermostMessageSender["media"]> {
+  const media = adapter.send?.media;
+  if (!media) {
+    throw new Error("Expected mattermost message adapter media sender");
+  }
+  return media;
+}
+
+function requirePayloadSender(
+  adapter: MattermostMessageAdapter,
+): NonNullable<MattermostMessageSender["payload"]> {
+  const payload = adapter.send?.payload;
+  if (!payload) {
+    throw new Error("Expected mattermost message adapter payload sender");
+  }
+  return payload;
+}
+
+describe("mattermost channel message adapter", () => {
+  beforeAll(async () => {
+    sendMessageMattermostMock.mockResolvedValue({
+      messageId: "warmup-post",
+      channelId: "channel-1",
+    });
+    await requireTextSender(requireMattermostMessageAdapter())({
+      cfg: {},
+      to: "channel:warmup",
+      text: "warmup",
+      accountId: "default",
+    });
+    sendMessageMattermostMock.mockReset();
+  });
+
+  beforeEach(() => {
+    sendMessageMattermostMock.mockReset();
+    sendMessageMattermostMock.mockResolvedValue({
+      messageId: "post-1",
+      channelId: "channel-1",
+    });
+  });
+
+  it("declares durable-final capabilities covered by outbound proof tests", async () => {
+    const adapter = requireMattermostMessageAdapter();
+    const sendPayload = requirePayloadSender(adapter);
+
+    const provePayload = async () => {
+      sendMessageMattermostMock.mockClear();
+      sendMessageMattermostMock.mockResolvedValueOnce({
+        messageId: "post-1",
+        channelId: "channel-1",
+        receipt: {
+          primaryPlatformMessageId: "post-1",
+          platformMessageIds: ["post-1"],
+          parts: [{ platformMessageId: "post-1", kind: "card", index: 0 }],
+          sentAt: Date.now(),
+        },
+      });
+      const result = await sendPayload({
+        cfg: {},
+        to: "channel:team-1",
+        text: "card",
+        accountId: "default",
+        payload: {
+          text: "card",
+          channelData: {
+            mattermost: {
+              presentationButtons: [[{ text: "Open", callback_data: "open" }]],
+            },
+          },
+        },
+      });
+      expect(sendMessageMattermostMock).toHaveBeenLastCalledWith("channel:team-1", "card", {
+        cfg: {},
+        accountId: "default",
+        mediaUrl: undefined,
+        mediaLocalRoots: undefined,
+        mediaReadFile: undefined,
+        replyToId: undefined,
+        buttons: [[{ text: "Open", callback_data: "open" }]],
+      });
+      expect(result.receipt.platformMessageIds).toEqual(["post-1"]);
+      expect(result.receipt.parts[0]?.kind).toBe("card");
+    };
+
+    await verifyChannelMessageAdapterCapabilityProofs({
+      adapterName: "mattermostMessageAdapter",
+      adapter,
+      proofs: {
+        payload: provePayload,
+        text: () => undefined,
+        media: () => undefined,
+        replyTo: () => undefined,
+        thread: () => undefined,
+        messageSendingHooks: () => {
+          expect(requireTextSender(adapter)).toBeTypeOf("function");
+        },
+      },
+    });
+  });
+
+  it("sends text through Mattermost", async () => {
+    const sendText = requireTextSender(requireMattermostMessageAdapter());
+
+    const result = await sendText({
+      cfg: {},
+      to: "channel:team-1",
+      text: "hello",
+      accountId: "default",
+    });
+
+    expect(sendMessageMattermostMock).toHaveBeenLastCalledWith("channel:team-1", "hello", {
+      cfg: {},
+      accountId: "default",
+      replyToId: undefined,
+    });
+    expect(result.receipt.platformMessageIds).toEqual(["post-1"]);
+    expect(result.receipt.parts[0]?.kind).toBe("text");
+  });
+
+  it("sends media through Mattermost", async () => {
+    const sendMedia = requireMediaSender(requireMattermostMessageAdapter());
+
+    const result = await sendMedia({
+      cfg: {},
+      to: "channel:team-1",
+      text: "caption",
+      mediaUrl: "https://example.com/a.png",
+      mediaLocalRoots: ["/tmp/media"],
+      accountId: "default",
+    });
+
+    expect(sendMessageMattermostMock).toHaveBeenLastCalledWith("channel:team-1", "caption", {
+      cfg: {},
+      accountId: "default",
+      mediaUrl: "https://example.com/a.png",
+      mediaLocalRoots: ["/tmp/media"],
+      replyToId: undefined,
+    });
+    expect(result.receipt.parts[0]?.kind).toBe("media");
+  });
+
+  it("maps thread ids to Mattermost reply targets", async () => {
+    const sendText = requireTextSender(requireMattermostMessageAdapter());
+
+    const result = await sendText({
+      cfg: {},
+      to: "channel:parent-1",
+      text: "threaded",
+      accountId: "default",
+      threadId: "thread-1",
+    });
+
+    expect(sendMessageMattermostMock).toHaveBeenLastCalledWith("channel:parent-1", "threaded", {
+      cfg: {},
+      accountId: "default",
+      replyToId: "thread-1",
+    });
+    expect(result.receipt.threadId).toBe("thread-1");
+  });
+
+  it("prefers explicit Mattermost reply ids over thread ids", async () => {
+    const sendText = requireTextSender(requireMattermostMessageAdapter());
+
+    const result = await sendText({
+      cfg: {},
+      to: "channel:parent-1",
+      text: "reply",
+      accountId: "default",
+      replyToId: "post-parent-1",
+      threadId: "thread-1",
+    });
+
+    expect(sendMessageMattermostMock).toHaveBeenLastCalledWith("channel:parent-1", "reply", {
+      cfg: {},
+      accountId: "default",
+      replyToId: "post-parent-1",
+    });
+    expect(result.receipt.replyToId).toBe("post-parent-1");
+  });
+
+  it("backs declared live preview finalizer capabilities with adapter proofs", async () => {
+    const adapter = requireMattermostMessageAdapter();
+    const sendText = requireTextSender(adapter);
+
+    await verifyChannelMessageLiveCapabilityAdapterProofs({
+      adapterName: "mattermostMessageAdapter",
+      adapter,
+      proofs: {
+        draftPreview: () => {
+          expect(adapter.live?.finalizer?.capabilities?.discardPending).toBe(true);
+        },
+        previewFinalization: () => {
+          expect(adapter.live?.finalizer?.capabilities?.finalEdit).toBe(true);
+        },
+        progressUpdates: () => {
+          expect(adapter.live?.capabilities?.draftPreview).toBe(true);
+        },
+      },
+    });
+
+    await verifyChannelMessageLiveFinalizerProofs({
+      adapterName: "mattermostMessageAdapter",
+      adapter,
+      proofs: {
+        finalEdit: () => {
+          expect(adapter.live?.capabilities?.previewFinalization).toBe(true);
+        },
+        normalFallback: () => {
+          expect(sendText).toBeTypeOf("function");
+        },
+        discardPending: () => {
+          expect(adapter.live?.capabilities?.draftPreview).toBe(true);
+        },
+      },
+    });
+  });
+});

extensions/mattermost/src/channel.runtime.ts

@@ -0,0 +1,10 @@
+// Mattermost plugin module implements channel behavior.
+export {
+  listMattermostDirectoryGroups,
+  listMattermostDirectoryPeers,
+} from "./mattermost/directory.js";
+export { monitorMattermostProvider } from "./mattermost/monitor.js";
+export { probeMattermost } from "./mattermost/probe.js";
+export { addMattermostReaction, removeMattermostReaction } from "./mattermost/reactions.js";
+export { sendMessageMattermost } from "./mattermost/send.js";
+export { resolveMattermostOpaqueTarget } from "./mattermost/target-resolution.js";

extensions/mattermost/src/channel.setup.ts

@@ -0,0 +1,39 @@
+// Mattermost plugin module implements channel.setup behavior.
+import type { ChannelPlugin } from "./channel-api.js";
+import {
+  describeMattermostAccount,
+  isMattermostConfigured,
+  mattermostConfigAdapter,
+  mattermostMeta,
+  resolveMattermostGatewayAuthBypassPaths,
+} from "./channel-config-shared.js";
+import { MattermostChannelConfigSchema } from "./config-surface.js";
+import type { ResolvedMattermostAccount } from "./mattermost/accounts.js";
+import { mattermostSetupAdapter } from "./setup-core.js";
+import { mattermostSetupWizard } from "./setup-surface.js";
+
+export const mattermostSetupPlugin: ChannelPlugin<ResolvedMattermostAccount> = {
+  id: "mattermost",
+  meta: {
+    ...mattermostMeta,
+  },
+  capabilities: {
+    chatTypes: ["direct", "channel", "group", "thread"],
+    reactions: true,
+    threads: true,
+    media: true,
+    nativeCommands: true,
+  },
+  reload: { configPrefixes: ["channels.mattermost"] },
+  configSchema: MattermostChannelConfigSchema,
+  config: {
+    ...mattermostConfigAdapter,
+    isConfigured: isMattermostConfigured,
+    describeAccount: describeMattermostAccount,
+  },
+  gateway: {
+    resolveGatewayAuthBypassPaths: ({ cfg }) => resolveMattermostGatewayAuthBypassPaths(cfg),
+  },
+  setup: mattermostSetupAdapter,
+  setupWizard: mattermostSetupWizard,
+};

extensions/mattermost/src/channel.ts

@@ -0,0 +1,941 @@
+// Mattermost plugin module implements channel behavior.
+import type {
+  ChannelMessageActionAdapter,
+  ChannelMessageActionName,
+  ChannelMessageToolDiscovery,
+  ChannelThreadingContext,
+  ChannelThreadingToolContext,
+  ChannelToolSend,
+} from "openclaw/plugin-sdk/channel-contract";
+import { createChatChannelPlugin } from "openclaw/plugin-sdk/channel-core";
+import { createChannelMessageAdapterFromOutbound } from "openclaw/plugin-sdk/channel-outbound";
+import { createLoggedPairingApprovalNotifier } from "openclaw/plugin-sdk/channel-pairing";
+import { createRestrictSendersChannelSecurity } from "openclaw/plugin-sdk/channel-policy";
+import {
+  attachChannelToResult,
+  createAttachedChannelResultAdapter,
+  type ChannelOutboundAdapter,
+} from "openclaw/plugin-sdk/channel-send-result";
+import type { OpenClawConfig } from "openclaw/plugin-sdk/config-contracts";
+import { createChannelDirectoryAdapter } from "openclaw/plugin-sdk/directory-runtime";
+import { buildPassiveProbedChannelStatusSummary } from "openclaw/plugin-sdk/extension-shared";
+import {
+  type MessagePresentation,
+  normalizeMessagePresentation,
+  renderMessagePresentationFallbackText,
+  resolveMessagePresentationControlValue,
+} from "openclaw/plugin-sdk/interactive-runtime";
+import { createLazyRuntimeModule } from "openclaw/plugin-sdk/lazy-runtime";
+import { resolvePayloadMediaUrls, sendTextMediaPayload } from "openclaw/plugin-sdk/reply-payload";
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import {
+  createComputedAccountStatusAdapter,
+  createDefaultChannelRuntimeState,
+} from "openclaw/plugin-sdk/status-helpers";
+import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { mattermostApprovalAuth } from "./approval-auth.js";
+import {
+  chunkTextForOutbound,
+  createAccountStatusSink,
+  DEFAULT_ACCOUNT_ID,
+  type ChannelPlugin,
+} from "./channel-api.js";
+import {
+  describeMattermostAccount,
+  isMattermostConfigured,
+  mattermostConfigAdapter,
+  mattermostMeta as meta,
+  normalizeMattermostAllowEntry as normalizeAllowEntry,
+  resolveMattermostGatewayAuthBypassPaths,
+} from "./channel-config-shared.js";
+import { MattermostChannelConfigSchema } from "./config-surface.js";
+import { mattermostDoctor } from "./doctor.js";
+import { resolveMattermostGroupRequireMention } from "./group-mentions.js";
+import {
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  resolveMattermostReplyToMode,
+  type ResolvedMattermostAccount,
+} from "./mattermost/accounts.js";
+import { looksLikeMattermostTargetId, normalizeMattermostMessagingTarget } from "./normalize.js";
+import { collectRuntimeConfigAssignments, secretTargetRegistryEntries } from "./secret-contract.js";
+import { resolveMattermostOutboundSessionRoute } from "./session-route.js";
+import { mattermostSetupAdapter } from "./setup-core.js";
+import { mattermostSetupWizard } from "./setup-surface.js";
+import type { MattermostConfig } from "./types.js";
+
+const loadMattermostChannelRuntime = createLazyRuntimeModule(() => import("./channel.runtime.js"));
+
+function buildMattermostPresentationButtons(presentation: MessagePresentation) {
+  return presentation.blocks
+    .filter((block) => block.type === "buttons")
+    .map((block) =>
+      block.buttons.flatMap((button) => {
+        if (button.action) {
+          return [];
+        }
+        const value = resolveMessagePresentationControlValue(button);
+        return value
+          ? [
+              {
+                id: value,
+                text: button.label,
+                callback_data: value,
+                context: {
+                  callback_data: value,
+                },
+                style: button.style,
+              },
+            ]
+          : [];
+      }),
+    )
+    .filter((row) => row.length > 0);
+}
+
+const MATTERMOST_PRESENTATION_CAPABILITIES = {
+  supported: true,
+  buttons: true,
+  selects: false,
+  context: true,
+  divider: false,
+  limits: {
+    text: {
+      markdownDialect: "markdown",
+    },
+  },
+} satisfies ChannelOutboundAdapter["presentationCapabilities"];
+
+function hasMattermostPresentationButtons(presentation: MessagePresentation): boolean {
+  return buildMattermostPresentationButtons(presentation).some((row) => row.length > 0);
+}
+
+function readMattermostPresentationButtons(payload: {
+  channelData?: Record<string, unknown>;
+}): Array<unknown> | undefined {
+  const buttons = (payload.channelData?.mattermost as { presentationButtons?: unknown } | undefined)
+    ?.presentationButtons;
+  return Array.isArray(buttons) ? buttons : undefined;
+}
+
+type MattermostDirectoryListParams = Parameters<
+  NonNullable<NonNullable<ChannelPlugin["directory"]>["listGroups"]>
+>[0];
+
+const mattermostSecurityAdapter = createRestrictSendersChannelSecurity<ResolvedMattermostAccount>({
+  channelKey: "mattermost",
+  resolveDmPolicy: (account) => account.config.dmPolicy,
+  resolveDmAllowFrom: (account) => account.config.allowFrom,
+  resolveGroupPolicy: (account) => account.config.groupPolicy,
+  surface: "Mattermost channels",
+  openScope: "any member",
+  groupPolicyPath: "channels.mattermost.groupPolicy",
+  groupAllowFromPath: "channels.mattermost.groupAllowFrom",
+  policyPathSuffix: "dmPolicy",
+  normalizeDmEntry: (raw) => normalizeAllowEntry(raw),
+});
+
+function describeMattermostMessageTool({
+  cfg,
+  accountId,
+}: Parameters<
+  NonNullable<ChannelMessageActionAdapter["describeMessageTool"]>
+>[0]): ChannelMessageToolDiscovery {
+  const enabledAccounts = (
+    accountId
+      ? [resolveMattermostAccount({ cfg, accountId })]
+      : listMattermostAccountIds(cfg).map((listedAccountId) =>
+          resolveMattermostAccount({ cfg, accountId: listedAccountId }),
+        )
+  )
+    .filter((account) => account.enabled)
+    .filter((account) => Boolean(account.botToken?.trim() && account.baseUrl?.trim()));
+
+  const actions: ChannelMessageActionName[] = [];
+
+  if (enabledAccounts.length > 0) {
+    actions.push("send");
+  }
+
+  const actionsConfig = cfg.channels?.mattermost?.actions as { reactions?: boolean } | undefined;
+  const baseReactions = actionsConfig?.reactions;
+  const hasReactionCapableAccount = enabledAccounts.some((account) => {
+    const accountActions = account.config.actions as { reactions?: boolean } | undefined;
+    return accountActions?.reactions ?? baseReactions ?? true;
+  });
+  if (hasReactionCapableAccount) {
+    actions.push("react");
+  }
+
+  return {
+    actions,
+    capabilities: enabledAccounts.length > 0 ? ["presentation"] : [],
+  };
+}
+
+function hasConfiguredMattermostDirectoryAccount({
+  cfg,
+  accountId,
+}: Pick<MattermostDirectoryListParams, "cfg" | "accountId">): boolean {
+  const accounts = accountId
+    ? [resolveMattermostAccount({ cfg, accountId })]
+    : listMattermostAccountIds(cfg).map((listedAccountId) =>
+        resolveMattermostAccount({ cfg, accountId: listedAccountId }),
+      );
+  return accounts.some((account) =>
+    Boolean(account.enabled && account.botToken?.trim() && account.baseUrl?.trim()),
+  );
+}
+
+function extractMattermostToolSend(args: Record<string, unknown>): ChannelToolSend | null {
+  if (normalizeOptionalString(args.action) !== "send") {
+    return null;
+  }
+  const to = normalizeOptionalString(args.to) ?? normalizeOptionalString(args.target);
+  if (!to) {
+    return null;
+  }
+  const threadId =
+    normalizeOptionalString(args.threadId) ??
+    normalizeOptionalString(args.replyToId) ??
+    normalizeOptionalString(args.replyTo);
+  const threadSuppressed = args.topLevel === true || args.threadId === null;
+  return {
+    to,
+    accountId: normalizeOptionalString(args.accountId),
+    ...(threadId ? { threadId } : {}),
+    ...(!threadId && !threadSuppressed ? { threadImplicit: true } : {}),
+    ...(threadSuppressed ? { threadSuppressed: true } : {}),
+  };
+}
+
+function extractMattermostToolSendResult(
+  result: unknown,
+  send: ChannelToolSend,
+): ChannelToolSend | null {
+  if (!result || typeof result !== "object") {
+    return null;
+  }
+  const details = (result as { details?: unknown }).details;
+  if (!details || typeof details !== "object") {
+    return null;
+  }
+  const toolSend = (details as { toolSend?: unknown }).toolSend;
+  if (!toolSend || typeof toolSend !== "object") {
+    return null;
+  }
+  const record = toolSend as Record<string, unknown>;
+  const to = normalizeOptionalString(record.to);
+  if (!to) {
+    return null;
+  }
+  const threadId = normalizeOptionalString(record.threadId);
+  const originalTarget = normalizeOptionalString(send.to);
+  const preserveOriginalTarget =
+    originalTarget?.startsWith("user:") === true || originalTarget?.startsWith("@") === true;
+  return {
+    to: preserveOriginalTarget ? originalTarget : to,
+    ...(threadId ? { threadId } : {}),
+  };
+}
+
+function resolveMattermostAutoThreadId(params: {
+  to: string;
+  replyToId?: string | null;
+  toolContext?: {
+    currentChannelId?: string;
+    currentThreadTs?: string;
+    currentMessageId?: string | number;
+    replyToMode?: "off" | "first" | "all" | "batched";
+    hasRepliedRef?: { value: boolean };
+  };
+}): string | undefined {
+  const replyToId = normalizeOptionalString(params.replyToId);
+  const context = params.toolContext;
+  const currentThreadId = normalizeOptionalString(context?.currentThreadTs);
+  const currentMessageId =
+    typeof context?.currentMessageId === "number"
+      ? String(context.currentMessageId)
+      : normalizeOptionalString(context?.currentMessageId);
+  const currentTarget = normalizeMattermostThreadTarget(context?.currentChannelId);
+  if (currentThreadId && currentTarget === normalizeMattermostThreadTarget(params.to)) {
+    if (replyToId === currentMessageId) {
+      return currentThreadId;
+    }
+    if (!replyToId) {
+      const replyToMode = context?.replyToMode;
+      const canInheritThread =
+        replyToMode === "all" ||
+        (replyToMode === "first" && context?.hasRepliedRef?.value !== true);
+      return canInheritThread ? currentThreadId : undefined;
+    }
+  }
+  return replyToId;
+}
+
+function normalizeMattermostThreadTarget(raw: string | undefined): string | undefined {
+  const normalized = raw ? normalizeMattermostMessagingTarget(raw) : undefined;
+  if (normalized) {
+    return normalized;
+  }
+  const trimmed = normalizeOptionalString(raw);
+  return trimmed && /^[a-z0-9]{26}$/i.test(trimmed) ? `channel:${trimmed}` : undefined;
+}
+
+function matchesMattermostToolContextTarget(params: {
+  target: string;
+  toolContext: ChannelThreadingToolContext;
+}): boolean {
+  const target = normalizeMattermostThreadTarget(params.target);
+  if (!target) {
+    return false;
+  }
+  return [params.toolContext.currentChannelId, params.toolContext.currentMessagingTarget].some(
+    (currentTarget) => normalizeMattermostThreadTarget(currentTarget) === target,
+  );
+}
+
+function normalizeMattermostThreadId(value: string | number | undefined): string | undefined {
+  return typeof value === "number" ? String(value) : normalizeOptionalString(value);
+}
+
+function buildMattermostThreadingToolContext(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+  context: ChannelThreadingContext;
+  hasRepliedRef?: { value: boolean };
+}): ChannelThreadingToolContext {
+  const account = resolveMattermostAccount({
+    cfg: params.cfg,
+    accountId: params.accountId ?? resolveDefaultMattermostAccountId(params.cfg),
+  });
+  const chatType =
+    params.context.ChatType === "direct" ||
+    params.context.ChatType === "group" ||
+    params.context.ChatType === "channel"
+      ? params.context.ChatType
+      : "channel";
+  const configuredReplyToMode = resolveMattermostReplyToMode(account, chatType);
+  const currentThreadTs =
+    normalizeMattermostThreadId(params.context.MessageThreadId) ??
+    normalizeMattermostThreadId(params.context.TransportThreadId) ??
+    normalizeOptionalString(params.context.ReplyToId);
+  const currentMessageId = normalizeMattermostThreadId(params.context.CurrentMessageId);
+  const hasExistingThread =
+    Boolean(currentThreadTs) && (!currentMessageId || currentThreadTs !== currentMessageId);
+  const currentChannelId = params.context.To
+    ? normalizeMattermostMessagingTarget(params.context.To)
+    : undefined;
+  return {
+    currentChannelId,
+    currentThreadTs,
+    currentMessageId: params.context.CurrentMessageId,
+    replyToMode: hasExistingThread ? "all" : configuredReplyToMode,
+    hasRepliedRef: params.hasRepliedRef,
+    sameChannelThreadRequired: Boolean(currentThreadTs),
+  };
+}
+
+async function listMattermostDirectoryGroups(params: MattermostDirectoryListParams) {
+  if (!hasConfiguredMattermostDirectoryAccount(params)) {
+    return [];
+  }
+  return (await loadMattermostChannelRuntime()).listMattermostDirectoryGroups(params);
+}
+
+async function listMattermostDirectoryPeers(params: MattermostDirectoryListParams) {
+  if (!hasConfiguredMattermostDirectoryAccount(params)) {
+    return [];
+  }
+  return (await loadMattermostChannelRuntime()).listMattermostDirectoryPeers(params);
+}
+
+const mattermostMessageActions: ChannelMessageActionAdapter = {
+  describeMessageTool: describeMattermostMessageTool,
+  extractToolSend: ({ args }) => extractMattermostToolSend(args),
+  extractToolSendResult: ({ result, send }) => extractMattermostToolSendResult(result, send),
+  supportsAction: ({ action }) => {
+    return action === "send" || action === "react";
+  },
+  handleAction: async ({
+    action,
+    params,
+    cfg,
+    accountId,
+    mediaAccess,
+    mediaLocalRoots,
+    mediaReadFile,
+  }) => {
+    if (action === "react") {
+      const resolvedAccountId = accountId ?? resolveDefaultMattermostAccountId(cfg);
+      const mattermostConfig = cfg.channels?.mattermost as MattermostConfig | undefined;
+      const account = resolveMattermostAccount({ cfg, accountId: resolvedAccountId });
+      const reactionsEnabled =
+        account.config.actions?.reactions ?? mattermostConfig?.actions?.reactions ?? true;
+      if (!reactionsEnabled) {
+        throw new Error("Mattermost reactions are disabled in config");
+      }
+
+      const { postId, emojiName, remove } = parseMattermostReactActionParams(params);
+      if (remove) {
+        const result = await (
+          await loadMattermostChannelRuntime()
+        ).removeMattermostReaction({
+          cfg,
+          postId,
+          emojiName,
+          accountId: resolvedAccountId,
+        });
+        if (!result.ok) {
+          throw new Error(result.error);
+        }
+        return {
+          content: [
+            { type: "text" as const, text: `Removed reaction :${emojiName}: from ${postId}` },
+          ],
+          details: {},
+        };
+      }
+
+      const result = await (
+        await loadMattermostChannelRuntime()
+      ).addMattermostReaction({
+        cfg,
+        postId,
+        emojiName,
+        accountId: resolvedAccountId,
+      });
+      if (!result.ok) {
+        throw new Error(result.error);
+      }
+
+      return {
+        content: [{ type: "text" as const, text: `Reacted with :${emojiName}: on ${postId}` }],
+        details: {},
+      };
+    }
+
+    if (action !== "send") {
+      throw new Error(`Unsupported Mattermost action: ${action}`);
+    }
+
+    // Send action with optional interactive buttons
+    const to =
+      typeof params.to === "string"
+        ? params.to.trim()
+        : typeof params.target === "string"
+          ? params.target.trim()
+          : "";
+    if (!to) {
+      throw new Error("Mattermost send requires a target (to).");
+    }
+
+    const presentation = normalizeMessagePresentation(params.presentation);
+    const message = presentation
+      ? renderMessagePresentationFallbackText({
+          text: typeof params.message === "string" ? params.message : "",
+          presentation,
+        })
+      : typeof params.message === "string"
+        ? params.message
+        : "";
+    // Mattermost post root_id is the thread root. A generic replyTo can name
+    // the current child post, so prefer threadId unless the caller supplied the
+    // Mattermost-specific replyToId root directly.
+    const replyToId =
+      normalizeOptionalString(params.replyToId) ??
+      normalizeOptionalString(params.threadId) ??
+      normalizeOptionalString(params.replyTo);
+    const resolvedAccountId = accountId || undefined;
+
+    const attachmentMedia = collectMattermostAttachmentMedia(params);
+    if (attachmentMedia.hasUnsupportedAttachmentPayload) {
+      throw new Error(
+        "Mattermost send attachments require media, mediaUrl, path, filePath, fileUrl, mediaUrls, or attachments[] with one of those fields; buffer/base64 payloads are not supported.",
+      );
+    }
+    if (attachmentMedia.mediaUrls.length > 1) {
+      throw new Error(
+        "Mattermost send supports one attachment per message; split multiple mediaUrls or attachments[] entries into separate sends.",
+      );
+    }
+    const buttons = presentation ? buildMattermostPresentationButtons(presentation) : [];
+
+    const result = await (
+      await loadMattermostChannelRuntime()
+    ).sendMessageMattermost(to, message, {
+      cfg,
+      accountId: resolvedAccountId,
+      replyToId,
+      buttons: buttons.length > 0 ? buttons : undefined,
+      attachmentText: typeof params.attachmentText === "string" ? params.attachmentText : undefined,
+      mediaUrl: attachmentMedia.mediaUrls[0],
+      mediaLocalRoots: mediaLocalRoots ?? mediaAccess?.localRoots,
+      mediaReadFile: mediaReadFile ?? mediaAccess?.readFile,
+      ...(mediaAccess?.workspaceDir ? { workspaceDir: mediaAccess.workspaceDir } : {}),
+      requireMediaUpload: requiresMattermostMediaUpload(attachmentMedia.mediaUrls[0])
+        ? true
+        : undefined,
+    });
+
+    return {
+      content: [
+        {
+          type: "text" as const,
+          text: JSON.stringify({
+            ok: true,
+            channel: "mattermost",
+            messageId: result.messageId,
+            channelId: result.channelId,
+          }),
+        },
+      ],
+      details: {
+        toolSend: {
+          to: `channel:${result.channelId}`,
+          ...(replyToId ? { threadId: replyToId } : {}),
+        },
+      },
+    };
+  },
+};
+
+function parseMattermostReactActionParams(params: Record<string, unknown>): {
+  postId: string;
+  emojiName: string;
+  remove: boolean;
+} {
+  const postId =
+    normalizeOptionalString(params.messageId) ?? normalizeOptionalString(params.postId);
+  if (!postId) {
+    throw new Error("Mattermost react requires messageId (post id)");
+  }
+
+  const emojiName = normalizeOptionalString(params.emoji)?.replace(/^:+|:+$/g, "");
+  if (!emojiName) {
+    throw new Error("Mattermost react requires emoji");
+  }
+
+  return {
+    postId,
+    emojiName,
+    remove: params.remove === true,
+  };
+}
+
+function collectNonBlankStrings(values: Array<string | undefined>): string[] {
+  const collected: string[] = [];
+  const seen = new Set<string>();
+  for (const value of values) {
+    const trimmed = value?.trim();
+    if (trimmed && !seen.has(trimmed)) {
+      seen.add(trimmed);
+      collected.push(trimmed);
+    }
+  }
+  return collected;
+}
+
+function toSnakeCaseKey(key: string): string {
+  return key
+    .replace(/([A-Z]+)([A-Z][a-z])/g, "$1_$2")
+    .replace(/([a-z0-9])([A-Z])/g, "$1_$2")
+    .toLowerCase();
+}
+
+function readMattermostParam(params: Record<string, unknown>, key: string): unknown {
+  if (Object.hasOwn(params, key)) {
+    return params[key];
+  }
+  const snakeKey = toSnakeCaseKey(key);
+  return snakeKey === key || !Object.hasOwn(params, snakeKey) ? undefined : params[snakeKey];
+}
+
+function readMattermostStringParam(
+  params: Record<string, unknown>,
+  key: string,
+): string | undefined {
+  const raw = readMattermostParam(params, key);
+  return typeof raw === "string" ? normalizeOptionalString(raw) : undefined;
+}
+
+function readMattermostStringArrayParam(params: Record<string, unknown>, key: string): string[] {
+  const raw = readMattermostParam(params, key);
+  if (Array.isArray(raw)) {
+    return raw
+      .filter((entry): entry is string => typeof entry === "string")
+      .flatMap((entry) => {
+        const normalized = normalizeOptionalString(entry);
+        return normalized ? [normalized] : [];
+      });
+  }
+  if (typeof raw === "string") {
+    const normalized = normalizeOptionalString(raw);
+    return normalized ? [normalized] : [];
+  }
+  return [];
+}
+
+function requiresMattermostMediaUpload(mediaUrl: string | undefined): boolean {
+  const normalized = normalizeOptionalString(mediaUrl);
+  return Boolean(normalized && !/^https?:\/\//i.test(normalized));
+}
+
+function collectMattermostAttachmentMedia(params: Record<string, unknown>): {
+  mediaUrls: string[];
+  hasUnsupportedAttachmentPayload: boolean;
+} {
+  const mediaUrlCandidates: Array<string | undefined> = [
+    readMattermostStringParam(params, "media"),
+    readMattermostStringParam(params, "mediaUrl"),
+    readMattermostStringParam(params, "path"),
+    readMattermostStringParam(params, "filePath"),
+    readMattermostStringParam(params, "fileUrl"),
+  ];
+  mediaUrlCandidates.push(...readMattermostStringArrayParam(params, "mediaUrls"));
+
+  let hasUnsupportedAttachmentPayload =
+    typeof params.buffer === "string" || typeof params.base64 === "string";
+  if (Array.isArray(params.attachments)) {
+    for (const attachment of params.attachments) {
+      if (!attachment || typeof attachment !== "object" || Array.isArray(attachment)) {
+        continue;
+      }
+      const record = attachment as Record<string, unknown>;
+      mediaUrlCandidates.push(
+        readMattermostStringParam(record, "media"),
+        readMattermostStringParam(record, "mediaUrl"),
+        readMattermostStringParam(record, "path"),
+        readMattermostStringParam(record, "filePath"),
+        readMattermostStringParam(record, "fileUrl"),
+        readMattermostStringParam(record, "url"),
+      );
+      hasUnsupportedAttachmentPayload ||= typeof record.buffer === "string";
+      hasUnsupportedAttachmentPayload ||= typeof record.base64 === "string";
+    }
+  }
+
+  return {
+    mediaUrls: collectNonBlankStrings(mediaUrlCandidates),
+    hasUnsupportedAttachmentPayload,
+  };
+}
+
+const mattermostOutbound: ChannelOutboundAdapter = {
+  deliveryMode: "direct",
+  chunker: chunkTextForOutbound,
+  chunkerMode: "markdown",
+  textChunkLimit: 4000,
+  deliveryCapabilities: {
+    durableFinal: {
+      text: true,
+      media: true,
+      payload: true,
+      replyTo: true,
+      thread: true,
+      messageSendingHooks: true,
+    },
+  },
+  presentationCapabilities: MATTERMOST_PRESENTATION_CAPABILITIES,
+  renderPresentation: ({ payload, presentation }) => {
+    if (payload.mediaUrls && payload.mediaUrls.length > 1) {
+      return null;
+    }
+    const buttons = buildMattermostPresentationButtons(presentation);
+    if (!hasMattermostPresentationButtons(presentation)) {
+      return null;
+    }
+    return {
+      ...payload,
+      text: renderMessagePresentationFallbackText({ text: payload.text, presentation }),
+      channelData: {
+        ...payload.channelData,
+        mattermost: {
+          ...(payload.channelData?.mattermost as Record<string, unknown> | undefined),
+          presentationButtons: buttons,
+        },
+      },
+    };
+  },
+  sendPayload: async (ctx) => {
+    const buttons = readMattermostPresentationButtons(ctx.payload);
+    if (buttons?.length) {
+      const mediaUrl = resolvePayloadMediaUrls({
+        ...ctx.payload,
+        mediaUrl: ctx.payload.mediaUrl ?? ctx.mediaUrl,
+      })
+        .map((url) => url.trim())
+        .find(Boolean);
+      const result = await (
+        await loadMattermostChannelRuntime()
+      ).sendMessageMattermost(ctx.to, ctx.payload.text ?? ctx.text, {
+        cfg: ctx.cfg,
+        accountId: ctx.accountId ?? undefined,
+        mediaUrl,
+        mediaLocalRoots: ctx.mediaLocalRoots ?? ctx.mediaAccess?.localRoots,
+        mediaReadFile: ctx.mediaReadFile ?? ctx.mediaAccess?.readFile,
+        ...(ctx.mediaAccess?.workspaceDir ? { workspaceDir: ctx.mediaAccess.workspaceDir } : {}),
+        requireMediaUpload: requiresMattermostMediaUpload(mediaUrl) ? true : undefined,
+        replyToId: ctx.replyToId ?? (ctx.threadId != null ? String(ctx.threadId) : undefined),
+        buttons,
+      });
+      return attachChannelToResult("mattermost", result);
+    }
+    return await sendTextMediaPayload({ channel: "mattermost", ctx, adapter: mattermostOutbound });
+  },
+  resolveTarget: ({ to }) => {
+    const trimmed = to?.trim();
+    if (!trimmed) {
+      return {
+        ok: false,
+        error: new Error(
+          "Delivering to Mattermost requires --to <channelId|@username|user:ID|channel:ID>",
+        ),
+      };
+    }
+    return { ok: true, to: trimmed };
+  },
+  ...createAttachedChannelResultAdapter({
+    channel: "mattermost",
+    sendText: async ({ cfg, to, text, accountId, replyToId, threadId }) =>
+      await (
+        await loadMattermostChannelRuntime()
+      ).sendMessageMattermost(to, text, {
+        cfg,
+        accountId: accountId ?? undefined,
+        replyToId: replyToId ?? (threadId != null ? String(threadId) : undefined),
+      }),
+    sendMedia: async ({
+      cfg,
+      to,
+      text,
+      mediaUrl,
+      mediaAccess,
+      mediaLocalRoots,
+      mediaReadFile,
+      accountId,
+      replyToId,
+      threadId,
+    }) =>
+      await (
+        await loadMattermostChannelRuntime()
+      ).sendMessageMattermost(to, text, {
+        cfg,
+        accountId: accountId ?? undefined,
+        mediaUrl,
+        mediaLocalRoots: mediaLocalRoots ?? mediaAccess?.localRoots,
+        mediaReadFile: mediaReadFile ?? mediaAccess?.readFile,
+        ...(mediaAccess?.workspaceDir ? { workspaceDir: mediaAccess.workspaceDir } : {}),
+        requireMediaUpload: requiresMattermostMediaUpload(mediaUrl) ? true : undefined,
+        replyToId: replyToId ?? (threadId != null ? String(threadId) : undefined),
+      }),
+  }),
+};
+
+const mattermostMessageAdapter = createChannelMessageAdapterFromOutbound({
+  id: "mattermost",
+  outbound: mattermostOutbound,
+  live: {
+    capabilities: {
+      draftPreview: true,
+      previewFinalization: true,
+      progressUpdates: true,
+    },
+    finalizer: {
+      capabilities: {
+        finalEdit: true,
+        normalFallback: true,
+        discardPending: true,
+      },
+    },
+  },
+});
+
+export const mattermostPlugin: ChannelPlugin<ResolvedMattermostAccount> = createChatChannelPlugin({
+  base: {
+    id: "mattermost",
+    meta: {
+      ...meta,
+    },
+    setup: mattermostSetupAdapter,
+    setupWizard: mattermostSetupWizard,
+    capabilities: {
+      chatTypes: ["direct", "channel", "group", "thread"],
+      reactions: true,
+      threads: true,
+      media: true,
+      nativeCommands: true,
+    },
+    streaming: {
+      blockStreamingCoalesceDefaults: { minChars: 1500, idleMs: 1000 },
+    },
+    reload: { configPrefixes: ["channels.mattermost"] },
+    configSchema: MattermostChannelConfigSchema,
+    config: {
+      ...mattermostConfigAdapter,
+      isConfigured: isMattermostConfigured,
+      describeAccount: describeMattermostAccount,
+    },
+    approvalCapability: mattermostApprovalAuth,
+    doctor: mattermostDoctor,
+    groups: {
+      resolveRequireMention: resolveMattermostGroupRequireMention,
+    },
+    actions: mattermostMessageActions,
+    message: mattermostMessageAdapter,
+    secrets: {
+      secretTargetRegistryEntries,
+      collectRuntimeConfigAssignments,
+    },
+    directory: createChannelDirectoryAdapter({
+      listGroups: listMattermostDirectoryGroups,
+      listGroupsLive: listMattermostDirectoryGroups,
+      listPeers: listMattermostDirectoryPeers,
+      listPeersLive: listMattermostDirectoryPeers,
+    }),
+    messaging: {
+      targetPrefixes: ["mattermost"],
+      defaultMarkdownTableMode: "off",
+      normalizeTarget: normalizeMattermostMessagingTarget,
+      resolveDeliveryTarget: ({ conversationId, parentConversationId }) => {
+        const parent = parentConversationId?.trim();
+        const child = conversationId.trim();
+        return parent && parent !== child
+          ? { to: `channel:${parent}`, threadId: child }
+          : { to: normalizeMattermostMessagingTarget(`channel:${child}`) };
+      },
+      resolveOutboundSessionRoute: (params) => resolveMattermostOutboundSessionRoute(params),
+      targetResolver: {
+        looksLikeId: looksLikeMattermostTargetId,
+        hint: "<channelId|user:ID|channel:ID>",
+        resolveTarget: async ({ cfg, accountId, input }) => {
+          const resolved = await (
+            await loadMattermostChannelRuntime()
+          ).resolveMattermostOpaqueTarget({
+            input,
+            cfg,
+            accountId,
+          });
+          if (!resolved) {
+            return null;
+          }
+          return {
+            to: resolved.to,
+            kind: resolved.kind,
+            source: "directory",
+          };
+        },
+      },
+    },
+    status: createComputedAccountStatusAdapter<ResolvedMattermostAccount>({
+      defaultRuntime: createDefaultChannelRuntimeState(DEFAULT_ACCOUNT_ID, {
+        connected: false,
+        lastConnectedAt: null,
+        lastDisconnect: null,
+      }),
+      buildChannelSummary: ({ snapshot }) =>
+        buildPassiveProbedChannelStatusSummary(snapshot, {
+          botTokenSource: snapshot.botTokenSource ?? "none",
+          connected: snapshot.connected ?? false,
+          baseUrl: snapshot.baseUrl ?? null,
+        }),
+      probeAccount: async ({ account, timeoutMs }) => {
+        const token = account.botToken?.trim();
+        const baseUrl = account.baseUrl?.trim();
+        if (!token || !baseUrl) {
+          return { ok: false, error: "bot token or baseUrl missing" };
+        }
+        return await (
+          await loadMattermostChannelRuntime()
+        ).probeMattermost(baseUrl, token, timeoutMs, isPrivateNetworkOptInEnabled(account.config));
+      },
+      resolveAccountSnapshot: ({ account, runtime }) => ({
+        accountId: account.accountId,
+        name: account.name,
+        enabled: account.enabled,
+        configured: Boolean(account.botToken && account.baseUrl),
+        extra: {
+          botTokenSource: account.botTokenSource,
+          baseUrl: account.baseUrl,
+          dmPolicy: account.config.dmPolicy ?? "pairing",
+          connected: runtime?.connected ?? false,
+          lastConnectedAt: runtime?.lastConnectedAt ?? null,
+          lastDisconnect: runtime?.lastDisconnect ?? null,
+        },
+      }),
+    }),
+    gateway: {
+      resolveGatewayAuthBypassPaths: ({ cfg }) => resolveMattermostGatewayAuthBypassPaths(cfg),
+      startAccount: async (ctx) => {
+        const account = ctx.account;
+        const statusSink = createAccountStatusSink({
+          accountId: ctx.accountId,
+          setStatus: ctx.setStatus,
+        });
+        statusSink({
+          baseUrl: account.baseUrl,
+          botTokenSource: account.botTokenSource,
+        });
+        ctx.log?.info(`[${account.accountId}] starting channel`);
+        return (await loadMattermostChannelRuntime()).monitorMattermostProvider({
+          botToken: account.botToken ?? undefined,
+          baseUrl: account.baseUrl ?? undefined,
+          accountId: account.accountId,
+          config: ctx.cfg,
+          runtime: ctx.runtime,
+          abortSignal: ctx.abortSignal,
+          statusSink,
+        });
+      },
+    },
+  },
+  pairing: {
+    text: {
+      idLabel: "mattermostUserId",
+      message: "OpenClaw: your access has been approved.",
+      normalizeAllowEntry: (entry) => normalizeAllowEntry(entry),
+      notify: createLoggedPairingApprovalNotifier(
+        ({ id }) => `[mattermost] User ${id} approved for pairing`,
+      ),
+    },
+  },
+  threading: {
+    buildToolContext: (params) => buildMattermostThreadingToolContext(params),
+    scopedAccountReplyToMode: {
+      resolveAccount: (cfg, accountId) =>
+        resolveMattermostAccount({
+          cfg,
+          accountId: accountId ?? resolveDefaultMattermostAccountId(cfg),
+        }),
+      resolveReplyToMode: (account, chatType) =>
+        resolveMattermostReplyToMode(
+          account,
+          chatType === "direct" || chatType === "group" || chatType === "channel"
+            ? chatType
+            : "channel",
+        ),
+    },
+    resolveAutoThreadId: ({ to, replyToId, toolContext }) =>
+      resolveMattermostAutoThreadId({ to, replyToId, toolContext }),
+    matchesToolContextTarget: ({ target, toolContext }) =>
+      matchesMattermostToolContextTarget({ target, toolContext }),
+    resolveReplyTransport: ({ threadId, replyToId, replyToIsExplicit, replyDelivery }) => {
+      const ambientThreadId = threadId != null ? String(threadId) : undefined;
+      const resolvedThreadId =
+        replyDelivery?.chatType === "direct"
+          ? undefined
+          : replyDelivery
+            ? replyToIsExplicit
+              ? (replyToId ?? ambientThreadId)
+              : (ambientThreadId ?? replyToId ?? undefined)
+            : (ambientThreadId ?? replyToId);
+      return {
+        replyToId: replyDelivery?.chatType === "direct" ? null : resolvedThreadId,
+        threadId: resolvedThreadId ?? null,
+      };
+    },
+  },
+  security: mattermostSecurityAdapter,
+  outbound: mattermostOutbound,
+});

extensions/mattermost/src/config-schema-core.ts

@@ -0,0 +1,179 @@
+// Mattermost helper module supports config schema core behavior.
+import {
+  BlockStreamingCoalesceSchema,
+  DmPolicySchema,
+  GroupPolicySchema,
+  MarkdownConfigSchema,
+  requireOpenAllowFrom,
+} from "openclaw/plugin-sdk/channel-config-primitives";
+import { z } from "zod";
+import { buildSecretInputSchema } from "./secret-input.js";
+
+const MattermostGroupSchema = z
+  .object({
+    /** Whether mentions are required to trigger the bot in this group. */
+    requireMention: z.boolean().optional(),
+  })
+  .strict();
+
+function requireMattermostOpenAllowFrom(params: {
+  policy?: string;
+  allowFrom?: Array<string | number>;
+  ctx: z.RefinementCtx;
+}) {
+  requireOpenAllowFrom({
+    policy: params.policy,
+    allowFrom: params.allowFrom,
+    ctx: params.ctx,
+    path: ["allowFrom"],
+    message:
+      'channels.mattermost.dmPolicy="open" requires channels.mattermost.allowFrom to include "*"',
+  });
+}
+
+const DmChannelRetrySchema = z
+  .object({
+    /** Maximum number of retry attempts for DM channel creation (default: 3) */
+    maxRetries: z.number().int().min(0).max(10).optional(),
+    /** Initial delay in milliseconds before first retry (default: 1000) */
+    initialDelayMs: z.number().int().min(100).max(60000).optional(),
+    /** Maximum delay in milliseconds between retries (default: 10000) */
+    maxDelayMs: z.number().int().min(1000).max(60000).optional(),
+    /** Timeout for each individual DM channel creation request in milliseconds (default: 30000) */
+    timeoutMs: z.number().int().min(5000).max(120000).optional(),
+  })
+  .strict()
+  .refine(
+    (data) => {
+      if (data.initialDelayMs !== undefined && data.maxDelayMs !== undefined) {
+        return data.initialDelayMs <= data.maxDelayMs;
+      }
+      return true;
+    },
+    {
+      message: "initialDelayMs must be less than or equal to maxDelayMs",
+      path: ["initialDelayMs"],
+    },
+  )
+  .optional();
+
+const MattermostSlashCommandsSchema = z
+  .object({
+    /** Enable native slash commands. "auto" resolves to false (opt-in). */
+    native: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Also register skill-based commands. */
+    nativeSkills: z.union([z.boolean(), z.literal("auto")]).optional(),
+    /** Path for the callback endpoint on the gateway HTTP server. */
+    callbackPath: z.string().optional(),
+    /** Explicit callback URL (e.g. behind reverse proxy). */
+    callbackUrl: z.string().optional(),
+  })
+  .strict()
+  .optional();
+
+const MattermostNetworkSchema = z
+  .object({
+    /** Dangerous opt-in for self-hosted Mattermost on trusted private/internal hosts. */
+    dangerouslyAllowPrivateNetwork: z.boolean().optional(),
+  })
+  .strict()
+  .optional();
+
+const MattermostStreamingModeSchema = z.enum(["off", "partial", "block", "progress"]);
+const MattermostStreamingProgressSchema = z
+  .object({
+    label: z.union([z.string(), z.literal(false)]).optional(),
+    labels: z.array(z.string()).optional(),
+    maxLines: z.number().int().positive().optional(),
+    maxLineChars: z.number().int().positive().optional(),
+    toolProgress: z.boolean().optional(),
+  })
+  .strict();
+const MattermostStreamingPreviewSchema = z
+  .object({
+    toolProgress: z.boolean().optional(),
+  })
+  .strict();
+const MattermostStreamingBlockSchema = z
+  .object({
+    enabled: z.boolean().optional(),
+    coalesce: BlockStreamingCoalesceSchema.optional(),
+  })
+  .strict();
+const MattermostStreamingSchema = z.union([
+  MattermostStreamingModeSchema,
+  z.boolean(),
+  z
+    .object({
+      mode: MattermostStreamingModeSchema.optional(),
+      chunkMode: z.enum(["length", "newline"]).optional(),
+      preview: MattermostStreamingPreviewSchema.optional(),
+      progress: MattermostStreamingProgressSchema.optional(),
+      block: MattermostStreamingBlockSchema.optional(),
+    })
+    .strict(),
+]);
+
+const MattermostAccountSchemaBase = z
+  .object({
+    name: z.string().optional(),
+    capabilities: z.array(z.string()).optional(),
+    dangerouslyAllowNameMatching: z.boolean().optional(),
+    markdown: MarkdownConfigSchema,
+    enabled: z.boolean().optional(),
+    configWrites: z.boolean().optional(),
+    botToken: buildSecretInputSchema().optional(),
+    baseUrl: z.string().optional(),
+    chatmode: z.enum(["oncall", "onmessage", "onchar"]).optional(),
+    oncharPrefixes: z.array(z.string()).optional(),
+    requireMention: z.boolean().optional(),
+    dmPolicy: DmPolicySchema.optional().default("pairing"),
+    allowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
+    groupPolicy: GroupPolicySchema.optional().default("allowlist"),
+    textChunkLimit: z.number().int().positive().optional(),
+    chunkMode: z.enum(["length", "newline"]).optional(),
+    streaming: MattermostStreamingSchema.optional(),
+    blockStreaming: z.boolean().optional(),
+    blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
+    replyToMode: z.enum(["off", "first", "all", "batched"]).optional(),
+    responsePrefix: z.string().optional(),
+    actions: z
+      .object({
+        reactions: z.boolean().optional(),
+      })
+      .optional(),
+    commands: MattermostSlashCommandsSchema,
+    interactions: z
+      .object({
+        callbackBaseUrl: z.string().optional(),
+        allowedSourceIps: z.array(z.string()).optional(),
+      })
+      .optional(),
+    /** Per-group configuration (keyed by Mattermost channel ID or "*" for default). */
+    groups: z.record(z.string(), MattermostGroupSchema.optional()).optional(),
+    /** Network policy overrides for self-hosted Mattermost on trusted private/internal hosts. */
+    network: MattermostNetworkSchema,
+    /** Retry configuration for DM channel creation */
+    dmChannelRetry: DmChannelRetrySchema,
+  })
+  .strict();
+
+const MattermostAccountSchema = MattermostAccountSchemaBase.superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});
+
+export const MattermostConfigSchema = MattermostAccountSchemaBase.extend({
+  accounts: z.record(z.string(), MattermostAccountSchema.optional()).optional(),
+  defaultAccount: z.string().optional(),
+}).superRefine((value, ctx) => {
+  requireMattermostOpenAllowFrom({
+    policy: value.dmPolicy,
+    allowFrom: value.allowFrom,
+    ctx,
+  });
+});

extensions/mattermost/src/config-schema.test.ts

@@ -0,0 +1,117 @@
+// Mattermost tests cover config schema plugin behavior.
+import { describe, expect, it } from "vitest";
+import { MattermostConfigSchema } from "./config-schema-core.js";
+
+describe("MattermostConfigSchema", () => {
+  it("accepts SecretRef botToken at top-level", () => {
+    const result = MattermostConfigSchema.safeParse({
+      botToken: { source: "env", provider: "default", id: "MATTERMOST_BOT_TOKEN" },
+      baseUrl: "https://chat.example.com",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts SecretRef botToken on account", () => {
+    const result = MattermostConfigSchema.safeParse({
+      accounts: {
+        main: {
+          botToken: { source: "env", provider: "default", id: "MATTERMOST_BOT_TOKEN_MAIN" },
+          baseUrl: "https://chat.example.com",
+        },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts replyToMode", () => {
+    const result = MattermostConfigSchema.safeParse({
+      replyToMode: "all",
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects dmPolicy="open" without wildcard allowFrom', () => {
+    const result = MattermostConfigSchema.safeParse({
+      dmPolicy: "open",
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it('accepts dmPolicy="open" with wildcard allowFrom', () => {
+    const result = MattermostConfigSchema.safeParse({
+      dmPolicy: "open",
+      allowFrom: ["*"],
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts documented streaming modes and progress config", () => {
+    const result = MattermostConfigSchema.safeParse({
+      streaming: {
+        mode: "progress",
+        progress: {
+          label: "Shelling",
+          maxLines: 4,
+          toolProgress: false,
+        },
+      },
+      accounts: {
+        quiet: {
+          streaming: "off",
+        },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts groups with requireMention", () => {
+    const result = MattermostConfigSchema.safeParse({
+      groups: {
+        "*": { requireMention: true },
+        "channel-123": { requireMention: false },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("accepts groups on account", () => {
+    const result = MattermostConfigSchema.safeParse({
+      accounts: {
+        main: {
+          baseUrl: "https://chat.example.com",
+          groups: {
+            "*": { requireMention: true },
+          },
+        },
+      },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it("rejects unknown properties inside groups entry", () => {
+    const result = MattermostConfigSchema.safeParse({
+      groups: {
+        "*": { requireMention: true, unknownProp: "bad" },
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("rejects unsupported direct-message reply threading config", () => {
+    const result = MattermostConfigSchema.safeParse({
+      dm: {
+        replyToMode: "all",
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+
+  it("rejects unsupported per-chat-type reply threading config", () => {
+    const result = MattermostConfigSchema.safeParse({
+      replyToModeByChatType: {
+        direct: "all",
+      },
+    });
+    expect(result.success).toBe(false);
+  });
+});

extensions/mattermost/src/config-surface.ts

@@ -0,0 +1,8 @@
+// Mattermost helper module supports config surface behavior.
+import { buildChannelConfigSchema } from "openclaw/plugin-sdk/channel-config-primitives";
+import { MattermostConfigSchema } from "./config-schema-core.js";
+import { mattermostChannelConfigUiHints } from "./config-ui-hints.js";
+
+export const MattermostChannelConfigSchema = buildChannelConfigSchema(MattermostConfigSchema, {
+  uiHints: mattermostChannelConfigUiHints,
+});

extensions/mattermost/src/config-ui-hints.ts

@@ -0,0 +1,61 @@
+// Mattermost helper module supports config ui hints behavior.
+import type { ChannelConfigUiHint } from "openclaw/plugin-sdk/channel-core";
+
+export const mattermostChannelConfigUiHints = {
+  "": {
+    label: "Mattermost",
+    help: "Mattermost channel provider configuration for bot auth, access policy, slash commands, and preview streaming.",
+  },
+  dmPolicy: {
+    label: "Mattermost DM Policy",
+    help: 'Direct message access control ("pairing" recommended). "open" requires channels.mattermost.allowFrom=["*"].',
+  },
+  streaming: {
+    label: "Mattermost Streaming Mode",
+    help: 'Unified Mattermost stream preview mode: "off" | "partial" | "block" | "progress". "progress" keeps a single editable progress draft until final delivery.',
+  },
+  "streaming.mode": {
+    label: "Mattermost Streaming Mode",
+    help: 'Canonical Mattermost preview mode: "off" | "partial" | "block" | "progress".',
+  },
+  "streaming.progress.label": {
+    label: "Mattermost Progress Label",
+    help: 'Initial progress draft title. Use "auto" for built-in single-word labels, a custom string, or false to hide the title.',
+  },
+  "streaming.progress.labels": {
+    label: "Mattermost Progress Label Pool",
+    help: 'Candidate labels for streaming.progress.label="auto". Leave unset to use OpenClaw built-in progress labels.',
+  },
+  "streaming.progress.maxLines": {
+    label: "Mattermost Progress Max Lines",
+    help: "Maximum number of compact progress lines to keep below the draft label (default: 8).",
+  },
+  "streaming.progress.maxLineChars": {
+    label: "Mattermost Progress Max Line Chars",
+    help: "Maximum characters per compact progress line before truncation (default: 120). Prose cuts at word boundaries; commands and paths keep useful suffixes.",
+  },
+  "streaming.progress.toolProgress": {
+    label: "Mattermost Progress Tool Lines",
+    help: "Show compact tool/progress lines in progress draft mode (default: true). Set false to keep only the label until final delivery.",
+  },
+  "streaming.progress.commandText": {
+    label: "Mattermost Progress Command Text",
+    help: 'Command/exec detail in progress draft lines: "raw" preserves released behavior; "status" shows only the tool label.',
+  },
+  "streaming.preview.toolProgress": {
+    label: "Mattermost Draft Tool Progress",
+    help: "Show tool/progress activity in the live draft preview post (default: true). Set false to hide interim tool updates while the draft preview stays active.",
+  },
+  "streaming.preview.commandText": {
+    label: "Mattermost Draft Command Text",
+    help: 'Command/exec detail in preview tool-progress lines: "raw" preserves released behavior; "status" shows only the tool label.',
+  },
+  "streaming.block.enabled": {
+    label: "Mattermost Block Streaming Enabled",
+    help: 'Enable chunked block-style Mattermost preview delivery when channels.mattermost.streaming.mode="block".',
+  },
+  "streaming.block.coalesce": {
+    label: "Mattermost Block Streaming Coalesce",
+    help: "Merge streamed Mattermost block replies before final delivery.",
+  },
+} satisfies Record<string, ChannelConfigUiHint>;

extensions/mattermost/src/doctor-contract.ts

@@ -0,0 +1,10 @@
+// Mattermost plugin module implements doctor contract behavior.
+import { createLegacyPrivateNetworkDoctorContract } from "openclaw/plugin-sdk/ssrf-runtime";
+
+const contract = createLegacyPrivateNetworkDoctorContract({
+  channelKey: "mattermost",
+});
+
+export const legacyConfigRules = contract.legacyConfigRules;
+
+export const normalizeCompatibilityConfig = contract.normalizeCompatibilityConfig;

extensions/mattermost/src/doctor.test.ts

@@ -0,0 +1,51 @@
+// Mattermost tests cover doctor plugin behavior.
+import { describe, expect, it } from "vitest";
+import { mattermostDoctor } from "./doctor.js";
+
+function getMattermostCompatibilityNormalizer(): NonNullable<
+  typeof mattermostDoctor.normalizeCompatibilityConfig
+> {
+  const normalize = mattermostDoctor.normalizeCompatibilityConfig;
+  if (!normalize) {
+    throw new Error("Expected mattermost doctor to expose normalizeCompatibilityConfig");
+  }
+  return normalize;
+}
+
+describe("mattermost doctor", () => {
+  it("normalizes legacy private-network aliases", () => {
+    const normalize = getMattermostCompatibilityNormalizer();
+
+    const result = normalize({
+      cfg: {
+        channels: {
+          mattermost: {
+            allowPrivateNetwork: true,
+            accounts: {
+              work: {
+                allowPrivateNetwork: false,
+              },
+            },
+          },
+        },
+      } as never,
+    });
+
+    const mattermostConfig = result.config.channels?.mattermost;
+    if (!mattermostConfig) {
+      throw new Error("expected normalized Mattermost config");
+    }
+    expect(mattermostConfig.network).toEqual({
+      dangerouslyAllowPrivateNetwork: true,
+    });
+    const workAccount = mattermostConfig.accounts?.work as
+      | { network?: Record<string, unknown> }
+      | undefined;
+    if (!workAccount) {
+      throw new Error("expected Mattermost work account config");
+    }
+    expect(workAccount.network).toEqual({
+      dangerouslyAllowPrivateNetwork: false,
+    });
+  });
+});

extensions/mattermost/src/doctor.ts

@@ -0,0 +1,49 @@
+// Mattermost plugin module implements doctor behavior.
+import type { ChannelDoctorAdapter } from "openclaw/plugin-sdk/channel-contract";
+import { createDangerousNameMatchingMutableAllowlistWarningCollector } from "openclaw/plugin-sdk/channel-policy";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+import {
+  legacyConfigRules as MATTERMOST_LEGACY_CONFIG_RULES,
+  normalizeCompatibilityConfig as normalizeMattermostCompatibilityConfig,
+} from "./doctor-contract.js";
+
+function isMattermostMutableAllowEntry(raw: string): boolean {
+  const text = raw.trim();
+  if (!text || text === "*") {
+    return false;
+  }
+
+  const normalized = text
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .trim();
+  const lowered = normalizeLowercaseStringOrEmpty(normalized);
+
+  if (/^[a-z0-9]{26}$/.test(lowered)) {
+    return false;
+  }
+
+  return true;
+}
+
+const collectMattermostMutableAllowlistWarnings =
+  createDangerousNameMatchingMutableAllowlistWarningCollector({
+    channel: "mattermost",
+    detector: isMattermostMutableAllowEntry,
+    collectLists: (scope) => [
+      {
+        pathLabel: `${scope.prefix}.allowFrom`,
+        list: scope.account.allowFrom,
+      },
+      {
+        pathLabel: `${scope.prefix}.groupAllowFrom`,
+        list: scope.account.groupAllowFrom,
+      },
+    ],
+  });
+
+export const mattermostDoctor: ChannelDoctorAdapter = {
+  legacyConfigRules: MATTERMOST_LEGACY_CONFIG_RULES,
+  normalizeCompatibilityConfig: normalizeMattermostCompatibilityConfig,
+  collectMutableAllowlistWarnings: collectMattermostMutableAllowlistWarnings,
+};

extensions/mattermost/src/gateway-auth-bypass.test.ts

@@ -0,0 +1,39 @@
+// Mattermost tests cover gateway auth bypass plugin behavior.
+import { describe, expect, it } from "vitest";
+import {
+  collectMattermostSlashCallbackPaths,
+  resolveMattermostGatewayAuthBypassPaths,
+} from "./gateway-auth-bypass.js";
+
+describe("Mattermost gateway auth bypass paths", () => {
+  it("normalizes slash callback paths and callback URL paths", () => {
+    expect(
+      collectMattermostSlashCallbackPaths({
+        callbackPath: "api/channels/mattermost/command",
+        callbackUrl: "https://gateway.example.com/api/channels/mattermost/custom",
+      }),
+    ).toEqual(["/api/channels/mattermost/command", "/api/channels/mattermost/custom"]);
+  });
+
+  it("keeps only Mattermost channel callback paths", () => {
+    expect(
+      resolveMattermostGatewayAuthBypassPaths({
+        channels: {
+          mattermost: {
+            commands: {
+              callbackPath: "/api/channels/mattermost/command",
+              callbackUrl: "https://gateway.example.com/api/channels/nostr/default/profile",
+            },
+            accounts: {
+              work: {
+                commands: {
+                  callbackPath: "/api/channels/mattermost/work",
+                },
+              },
+            },
+          },
+        },
+      }),
+    ).toEqual(["/api/channels/mattermost/command", "/api/channels/mattermost/work"]);
+  });
+});

extensions/mattermost/src/gateway-auth-bypass.ts

@@ -0,0 +1,84 @@
+// Mattermost plugin module implements gateway auth bypass behavior.
+const DEFAULT_SLASH_CALLBACK_PATH = "/api/channels/mattermost/command";
+
+type MattermostSlashCommandConfigInput = {
+  callbackPath?: unknown;
+  callbackUrl?: unknown;
+};
+
+type MattermostAccountConfigInput = {
+  commands?: MattermostSlashCommandConfigInput;
+};
+
+type MattermostConfigInput = MattermostAccountConfigInput & {
+  accounts?: Record<string, unknown>;
+};
+
+function readTrimmedString(value: unknown): string | undefined {
+  return typeof value === "string" && value.trim() ? value.trim() : undefined;
+}
+
+function normalizeCallbackPath(value: unknown): string {
+  const trimmed = readTrimmedString(value);
+  if (!trimmed) {
+    return DEFAULT_SLASH_CALLBACK_PATH;
+  }
+  return trimmed.startsWith("/") ? trimmed : `/${trimmed}`;
+}
+
+function readMattermostCommands(value: unknown): MattermostSlashCommandConfigInput | undefined {
+  return value && typeof value === "object" && !Array.isArray(value)
+    ? (value as MattermostSlashCommandConfigInput)
+    : undefined;
+}
+
+function isMattermostBypassPath(path: string): boolean {
+  return path === DEFAULT_SLASH_CALLBACK_PATH || path.startsWith("/api/channels/mattermost/");
+}
+
+export function collectMattermostSlashCallbackPaths(
+  raw?: MattermostSlashCommandConfigInput,
+): string[] {
+  const paths = new Set<string>([normalizeCallbackPath(raw?.callbackPath)]);
+  const callbackUrl = readTrimmedString(raw?.callbackUrl);
+  if (callbackUrl) {
+    try {
+      const pathname = new URL(callbackUrl).pathname;
+      if (pathname) {
+        paths.add(pathname);
+      }
+    } catch {
+      // Keep the normalized callback path when the configured URL is invalid.
+    }
+  }
+  return [...paths];
+}
+
+export function resolveMattermostGatewayAuthBypassPaths(cfg: {
+  channels?: Record<string, unknown>;
+}): string[] {
+  const base =
+    cfg.channels?.mattermost && typeof cfg.channels.mattermost === "object"
+      ? (cfg.channels.mattermost as MattermostConfigInput)
+      : undefined;
+  const callbackPaths = new Set(
+    collectMattermostSlashCallbackPaths(readMattermostCommands(base?.commands)).filter(
+      isMattermostBypassPath,
+    ),
+  );
+  const accounts = base?.accounts ?? {};
+  for (const account of Object.values(accounts)) {
+    const accountConfig =
+      account && typeof account === "object" && !Array.isArray(account)
+        ? (account as MattermostAccountConfigInput)
+        : undefined;
+    for (const path of collectMattermostSlashCallbackPaths(
+      readMattermostCommands(accountConfig?.commands),
+    )) {
+      if (isMattermostBypassPath(path)) {
+        callbackPaths.add(path);
+      }
+    }
+  }
+  return [...callbackPaths];
+}

extensions/mattermost/src/group-mentions.test.ts

@@ -0,0 +1,47 @@
+// Mattermost tests cover group mentions plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../runtime-api.js";
+import { resolveMattermostGroupRequireMention } from "./group-mentions.js";
+
+describe("resolveMattermostGroupRequireMention", () => {
+  it("defaults to requiring mention when no override is configured", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {},
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({ cfg, accountId: "default" });
+    expect(requireMention).toBe(true);
+  });
+
+  it("respects chatmode-derived account override", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "onmessage",
+        },
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({ cfg, accountId: "default" });
+    expect(requireMention).toBe(false);
+  });
+
+  it("prefers an explicit runtime override when provided", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          chatmode: "oncall",
+        },
+      },
+    };
+
+    const requireMention = resolveMattermostGroupRequireMention({
+      cfg,
+      accountId: "default",
+      requireMentionOverride: false,
+    });
+    expect(requireMention).toBe(false);
+  });
+});

extensions/mattermost/src/group-mentions.ts

@@ -0,0 +1,24 @@
+// Mattermost plugin module implements group mentions behavior.
+import { resolveChannelGroupRequireMention } from "openclaw/plugin-sdk/channel-policy";
+import { resolveMattermostAccount } from "./mattermost/accounts.js";
+import type { ChannelGroupContext } from "./runtime-api.js";
+
+export function resolveMattermostGroupRequireMention(
+  params: ChannelGroupContext & { requireMentionOverride?: boolean },
+): boolean | undefined {
+  const account = resolveMattermostAccount({
+    cfg: params.cfg,
+    accountId: params.accountId,
+  });
+  const requireMentionOverride =
+    typeof params.requireMentionOverride === "boolean"
+      ? params.requireMentionOverride
+      : account.requireMention;
+  return resolveChannelGroupRequireMention({
+    cfg: params.cfg,
+    channel: "mattermost",
+    groupId: params.groupId,
+    accountId: params.accountId,
+    requireMentionOverride,
+  });
+}

extensions/mattermost/src/mattermost/accounts.test.ts

@@ -0,0 +1,207 @@
+// Mattermost tests cover accounts plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import {
+  listMattermostAccountIds,
+  resolveDefaultMattermostAccountId,
+  resolveMattermostAccount,
+  resolveMattermostReplyToMode,
+} from "./accounts.js";
+
+describe("resolveDefaultMattermostAccountId", () => {
+  it("prefers channels.mattermost.defaultAccount when it matches a configured account", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "alerts",
+          accounts: {
+            default: { botToken: "tok-default", baseUrl: "https://chat.example.com" },
+            alerts: { botToken: "tok-alerts", baseUrl: "https://alerts.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("alerts");
+  });
+
+  it("normalizes channels.mattermost.defaultAccount before lookup", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "Ops Team",
+          accounts: {
+            "ops-team": { botToken: "tok-ops", baseUrl: "https://chat.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("ops-team");
+  });
+
+  it("falls back when channels.mattermost.defaultAccount is missing", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "missing",
+          accounts: {
+            default: { botToken: "tok-default", baseUrl: "https://chat.example.com" },
+            alerts: { botToken: "tok-alerts", baseUrl: "https://alerts.example.com" },
+          },
+        },
+      },
+    };
+
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("default");
+  });
+
+  it("keeps the implicit default account when named accounts are added to top-level credentials", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          botToken: "tok-default",
+          baseUrl: "https://chat.example.com",
+          accounts: {
+            work: {
+              enabled: false,
+              botToken: "tok-work",
+              baseUrl: "https://work.example.com",
+            },
+          },
+        },
+      },
+    };
+
+    expect(listMattermostAccountIds(cfg)).toEqual(["default", "work"]);
+    expect(resolveDefaultMattermostAccountId(cfg)).toBe("default");
+  });
+
+  it("inherits top-level access policy for named accounts before doctor migration", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          dmPolicy: "open",
+          groupPolicy: "open",
+          allowFrom: ["*"],
+          groupAllowFrom: ["*"],
+          accounts: {
+            tony: {
+              botToken: "tok-tony",
+              baseUrl: "https://chat.example.com",
+            },
+          },
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg, accountId: "tony" });
+
+    expect(account.config.dmPolicy).toBe("open");
+    expect(account.config.groupPolicy).toBe("open");
+    expect(account.config.allowFrom).toEqual(["*"]);
+    expect(account.config.groupAllowFrom).toEqual(["*"]);
+  });
+});
+
+describe("resolveMattermostReplyToMode", () => {
+  it("uses configured defaultAccount when accountId is omitted", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          defaultAccount: "alerts",
+          accounts: {
+            alerts: {
+              botToken: "tok-alerts",
+              baseUrl: "https://alerts.example.com",
+              replyToMode: "all",
+            },
+          },
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg });
+    expect(account.accountId).toBe("alerts");
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("all");
+  });
+
+  it("uses the configured mode for channel and group messages", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          replyToMode: "all",
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("all");
+    expect(resolveMattermostReplyToMode(account, "group")).toBe("all");
+  });
+
+  it("keeps direct messages off even when replyToMode is enabled", () => {
+    const cfg: OpenClawConfig = {
+      channels: {
+        mattermost: {
+          replyToMode: "all",
+        },
+      },
+    };
+
+    const account = resolveMattermostAccount({ cfg, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "direct")).toBe("off");
+  });
+
+  it("defaults to off when replyToMode is unset", () => {
+    const account = resolveMattermostAccount({ cfg: {}, accountId: "default" });
+    expect(resolveMattermostReplyToMode(account, "channel")).toBe("off");
+  });
+
+  it("preserves shared commands config when an account overrides one commands field", () => {
+    const account = resolveMattermostAccount({
+      cfg: {
+        channels: {
+          mattermost: {
+            commands: {
+              native: true,
+            },
+            accounts: {
+              work: {
+                commands: {
+                  callbackPath: "/hooks/work",
+                },
+              },
+            },
+          },
+        },
+      },
+      accountId: "work",
+    });
+
+    expect(account.config.commands).toEqual({
+      native: true,
+      callbackPath: "/hooks/work",
+    });
+  });
+
+  it("resolves documented streaming mode from account config", () => {
+    const account = resolveMattermostAccount({
+      cfg: {
+        channels: {
+          mattermost: {
+            streaming: "partial",
+            accounts: {
+              work: {
+                streaming: "off",
+              },
+            },
+          },
+        },
+      },
+      accountId: "work",
+    });
+
+    expect(account.streamingMode).toBe("off");
+  });
+});

extensions/mattermost/src/mattermost/accounts.ts

@@ -0,0 +1,157 @@
+// Mattermost plugin module implements accounts behavior.
+import {
+  createAccountListHelpers,
+  hasConfiguredAccountValue,
+} from "openclaw/plugin-sdk/account-helpers";
+import { DEFAULT_ACCOUNT_ID, normalizeAccountId } from "openclaw/plugin-sdk/account-id";
+import { resolveMergedAccountConfig } from "openclaw/plugin-sdk/account-resolution";
+import {
+  resolveChannelStreamingBlockCoalesce,
+  resolveChannelStreamingBlockEnabled,
+  resolveChannelStreamingChunkMode,
+  resolveChannelPreviewStreamMode,
+  type StreamingMode,
+} from "openclaw/plugin-sdk/channel-outbound";
+import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { normalizeResolvedSecretInputString, normalizeSecretInputString } from "../secret-input.js";
+import type {
+  MattermostAccountConfig,
+  MattermostChatMode,
+  MattermostChatTypeKey,
+  MattermostReplyToMode,
+} from "../types.js";
+import { normalizeMattermostBaseUrl } from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+type MattermostTokenSource = "env" | "config" | "none";
+type MattermostBaseUrlSource = "env" | "config" | "none";
+
+export type ResolvedMattermostAccount = {
+  accountId: string;
+  enabled: boolean;
+  name?: string;
+  botToken?: string;
+  baseUrl?: string;
+  botTokenSource: MattermostTokenSource;
+  baseUrlSource: MattermostBaseUrlSource;
+  config: MattermostAccountConfig;
+  chatmode?: MattermostChatMode;
+  oncharPrefixes?: string[];
+  requireMention?: boolean;
+  textChunkLimit?: number;
+  chunkMode?: MattermostAccountConfig["chunkMode"];
+  streamingMode: StreamingMode;
+  blockStreaming?: boolean;
+  blockStreamingCoalesce?: MattermostAccountConfig["blockStreamingCoalesce"];
+};
+
+const mattermostAccountHelpers = createAccountListHelpers("mattermost", {
+  hasImplicitDefaultAccount: (cfg) => {
+    const mattermost = cfg.channels?.mattermost;
+    return Boolean(
+      mattermost?.baseUrl?.trim() &&
+      (hasConfiguredAccountValue(mattermost.botToken) || process.env.MATTERMOST_BOT_TOKEN?.trim()),
+    );
+  },
+});
+
+export function listMattermostAccountIds(cfg: OpenClawConfig): string[] {
+  return mattermostAccountHelpers.listAccountIds(cfg);
+}
+
+export function resolveDefaultMattermostAccountId(cfg: OpenClawConfig): string {
+  return mattermostAccountHelpers.resolveDefaultAccountId(cfg);
+}
+
+function mergeMattermostAccountConfig(
+  cfg: OpenClawConfig,
+  accountId: string,
+): MattermostAccountConfig {
+  return resolveMergedAccountConfig<MattermostAccountConfig>({
+    channelConfig: cfg.channels?.mattermost as MattermostAccountConfig | undefined,
+    accounts: cfg.channels?.mattermost?.accounts as
+      | Record<string, Partial<MattermostAccountConfig>>
+      | undefined,
+    accountId,
+    omitKeys: ["defaultAccount"],
+    nestedObjectKeys: ["commands"],
+  });
+}
+
+function resolveMattermostRequireMention(config: MattermostAccountConfig): boolean | undefined {
+  if (config.chatmode === "oncall") {
+    return true;
+  }
+  if (config.chatmode === "onmessage") {
+    return false;
+  }
+  if (config.chatmode === "onchar") {
+    return true;
+  }
+  return config.requireMention;
+}
+
+export function resolveMattermostAccount(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+  allowUnresolvedSecretRef?: boolean;
+}): ResolvedMattermostAccount {
+  const accountId = normalizeAccountId(
+    params.accountId ?? resolveDefaultMattermostAccountId(params.cfg),
+  );
+  const baseEnabled = params.cfg.channels?.mattermost?.enabled !== false;
+  const merged = mergeMattermostAccountConfig(params.cfg, accountId);
+  const accountEnabled = merged.enabled !== false;
+  const enabled = baseEnabled && accountEnabled;
+
+  const allowEnv = accountId === DEFAULT_ACCOUNT_ID;
+  const envToken = allowEnv ? process.env.MATTERMOST_BOT_TOKEN?.trim() : undefined;
+  const envUrl = allowEnv ? process.env.MATTERMOST_URL?.trim() : undefined;
+  const configToken = params.allowUnresolvedSecretRef
+    ? normalizeSecretInputString(merged.botToken)
+    : normalizeResolvedSecretInputString({
+        value: merged.botToken,
+        path: `channels.mattermost.accounts.${accountId}.botToken`,
+      });
+  const configUrl = merged.baseUrl?.trim();
+  const botToken = configToken || envToken;
+  const baseUrl = normalizeMattermostBaseUrl(configUrl || envUrl);
+  const requireMention = resolveMattermostRequireMention(merged);
+
+  const botTokenSource: MattermostTokenSource = configToken ? "config" : envToken ? "env" : "none";
+  const baseUrlSource: MattermostBaseUrlSource = configUrl ? "config" : envUrl ? "env" : "none";
+
+  return {
+    accountId,
+    enabled,
+    name: normalizeOptionalString(merged.name),
+    botToken,
+    baseUrl,
+    botTokenSource,
+    baseUrlSource,
+    config: merged,
+    chatmode: merged.chatmode,
+    oncharPrefixes: merged.oncharPrefixes,
+    requireMention,
+    textChunkLimit: merged.textChunkLimit,
+    chunkMode: resolveChannelStreamingChunkMode(merged) ?? merged.chunkMode,
+    streamingMode: resolveChannelPreviewStreamMode(merged, "partial"),
+    blockStreaming: resolveChannelStreamingBlockEnabled(merged) ?? merged.blockStreaming,
+    blockStreamingCoalesce:
+      resolveChannelStreamingBlockCoalesce(merged) ?? merged.blockStreamingCoalesce,
+  };
+}
+
+/**
+ * Resolve the effective replyToMode for a given chat type.
+ * Mattermost auto-threading only applies to channel and group messages.
+ */
+export function resolveMattermostReplyToMode(
+  account: ResolvedMattermostAccount,
+  kind: MattermostChatTypeKey,
+): MattermostReplyToMode {
+  if (kind === "direct") {
+    return "off";
+  }
+  return account.config.replyToMode ?? "off";
+}

extensions/mattermost/src/mattermost/client.retry.test.ts

@@ -0,0 +1,491 @@
+// Mattermost tests cover client.retry plugin behavior.
+import { MAX_TIMER_TIMEOUT_MS } from "openclaw/plugin-sdk/number-runtime";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import {
+  createMattermostClient,
+  createMattermostDirectChannelWithRetry,
+  resolveMattermostReplyDeliveryBarrierTimeoutMs,
+} from "./client.js";
+
+describe("resolveMattermostReplyDeliveryBarrierTimeoutMs", () => {
+  it("uses the default barrier for non-DM deliveries", () => {
+    expect(
+      resolveMattermostReplyDeliveryBarrierTimeoutMs({
+        isDirect: false,
+        queuedCounts: { tool: 1, block: 1, final: 1 },
+      }),
+    ).toBeUndefined();
+  });
+
+  it("uses the default barrier when no deliveries were queued", () => {
+    expect(
+      resolveMattermostReplyDeliveryBarrierTimeoutMs({
+        isDirect: true,
+        queuedCounts: { tool: 0, block: 0, final: 0 },
+      }),
+    ).toBeUndefined();
+  });
+
+  it("covers the default retry envelope plus scheduling slack", () => {
+    expect(
+      resolveMattermostReplyDeliveryBarrierTimeoutMs({
+        isDirect: true,
+        queuedCounts: { tool: 0, block: 0, final: 1 },
+      }),
+    ).toBe(210_000);
+  });
+
+  it("covers one maximum retry envelope per queued delivery", () => {
+    expect(
+      resolveMattermostReplyDeliveryBarrierTimeoutMs({
+        isDirect: true,
+        dmRetryOptions: {
+          maxRetries: 10,
+          maxDelayMs: 60_000,
+          timeoutMs: 120_000,
+        },
+        queuedCounts: { tool: 1, block: 0, final: 1 },
+      }),
+    ).toBe(3_960_000);
+  });
+
+  it("includes the configured inter-block delay budget", () => {
+    expect(
+      resolveMattermostReplyDeliveryBarrierTimeoutMs({
+        isDirect: true,
+        queuedCounts: { tool: 0, block: 2, final: 0 },
+        humanDelayBudgetMs: 180_000,
+      }),
+    ).toBe(600_000);
+  });
+});
+
+describe("createMattermostDirectChannelWithRetry", () => {
+  const mockFetch = vi.fn<typeof fetch>();
+
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.clearAllMocks();
+    vi.useFakeTimers();
+  });
+
+  afterEach(async () => {
+    await vi.runOnlyPendingTimersAsync();
+    vi.useRealTimers();
+    vi.restoreAllMocks();
+  });
+
+  function createMockClient() {
+    return createMattermostClient({
+      baseUrl: "https://mattermost.example.com",
+      botToken: "test-token",
+      fetchImpl: mockFetch,
+    });
+  }
+
+  function createFetchFailedError(params: { message: string; code?: string }): TypeError {
+    const cause = Object.assign(new Error(params.message), {
+      code: params.code,
+    });
+    return Object.assign(new TypeError("fetch failed"), { cause });
+  }
+
+  async function resolveRetryRun<T>(run: Promise<T>): Promise<T> {
+    await vi.runAllTimersAsync();
+    return await run;
+  }
+
+  function suppressUnhandled<T>(run: Promise<T>): Promise<T> {
+    run.catch(() => {});
+    return run;
+  }
+
+  function jsonResponse(body: unknown, status = 200): Response {
+    return Response.json(body, { status });
+  }
+
+  it("succeeds on first attempt without retries", async () => {
+    mockFetch.mockResolvedValueOnce(jsonResponse({ id: "dm-channel-123" }, 201));
+
+    const client = createMockClient();
+    const onRetry = vi.fn();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        onRetry,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-123");
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    expect(onRetry).not.toHaveBeenCalled();
+  });
+
+  it("retries on 429 rate limit error and succeeds", async () => {
+    mockFetch
+      .mockResolvedValueOnce(jsonResponse({ message: "Too many requests" }, 429))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-456" }, 201));
+
+    const client = createMockClient();
+    const onRetry = vi.fn();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+        onRetry,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-456");
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(onRetry).toHaveBeenCalledTimes(1);
+    const retryCall = onRetry.mock.calls[0];
+    expect(retryCall?.[0]).toBe(1);
+    expect(retryCall?.[1]).toBeGreaterThanOrEqual(10);
+    expect(retryCall?.[1]).toBeLessThanOrEqual(20);
+    expect(retryCall?.[2]).toBeInstanceOf(Error);
+    expect((retryCall?.[2] as Error | undefined)?.message).toContain("Too many requests");
+  });
+
+  it("retries on port 443 connection errors (not misclassified as 4xx)", async () => {
+    // This tests that port numbers like :443 don't trigger false 4xx classification
+    mockFetch
+      .mockRejectedValueOnce(new Error("connect ECONNRESET 104.18.32.10:443"))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-port" }, 201));
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    // Should retry and succeed on second attempt (port 443 should NOT be treated as 4xx)
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(result.id).toBe("dm-channel-port");
+  });
+
+  it("does not retry on 400 even if error message contains '429' text", async () => {
+    // This tests that "429" in error detail doesn't trigger false rate-limit retry
+    // e.g., "Invalid user ID: 4294967295" should NOT be retried
+    mockFetch.mockResolvedValueOnce(jsonResponse({ message: "Invalid user ID: 4294967295" }, 400));
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("Mattermost API 400");
+
+    // Should not retry - only called once (400 is a client error, even though message contains "429")
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("retries on 5xx server errors", async () => {
+    mockFetch
+      .mockResolvedValueOnce(jsonResponse({ message: "Service unavailable" }, 503))
+      .mockResolvedValueOnce(jsonResponse({ message: "Bad gateway" }, 502))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-789" }, 201));
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-789");
+    expect(mockFetch).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries on network errors", async () => {
+    mockFetch
+      .mockRejectedValueOnce(new Error("Network error: connection refused"))
+      .mockRejectedValueOnce(new Error("ECONNRESET"))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-abc" }, 201));
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-abc");
+    expect(mockFetch).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries on fetch failed errors when the cause carries a transient code", async () => {
+    mockFetch
+      .mockRejectedValueOnce(
+        createFetchFailedError({
+          message: "connect ECONNREFUSED 127.0.0.1:81",
+          code: "ECONNREFUSED",
+        }),
+      )
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-fetch-failed" }, 201));
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    expect(result.id).toBe("dm-channel-fetch-failed");
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+  });
+
+  it("does not retry on 4xx client errors (except 429)", async () => {
+    mockFetch.mockResolvedValueOnce(jsonResponse({ message: "Bad request" }, 400));
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("400");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not retry on 404 not found", async () => {
+    mockFetch.mockResolvedValueOnce(jsonResponse({ message: "User not found" }, 404));
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("404");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("throws after exhausting all retries", async () => {
+    mockFetch.mockImplementation(async () => jsonResponse({ message: "Service unavailable" }, 503));
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 2,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("Mattermost API 503");
+
+    expect(mockFetch).toHaveBeenCalledTimes(3); // initial + 2 retries
+  });
+
+  it("respects custom timeout option and aborts fetch", async () => {
+    let abortSignal: AbortSignal | undefined;
+    let abortListenerCalled = false;
+
+    mockFetch.mockImplementationOnce((url, init) => {
+      abortSignal = init?.signal ?? undefined;
+      if (abortSignal) {
+        abortSignal.addEventListener("abort", () => {
+          abortListenerCalled = true;
+        });
+      }
+      // Return a promise that rejects when aborted, otherwise never resolves
+      return new Promise((_, reject) => {
+        if (abortSignal) {
+          const checkAbort = () => {
+            if (abortSignal?.aborted) {
+              reject(new Error("AbortError"));
+            } else {
+              setTimeout(checkAbort, 10);
+            }
+          };
+          setTimeout(checkAbort, 10);
+        }
+      });
+    });
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        timeoutMs: 50,
+        maxRetries: 0,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("AbortError");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    expect(abortSignal).toBeInstanceOf(AbortSignal);
+    expect(abortSignal?.aborted).toBe(true);
+    expect(abortListenerCalled).toBe(true);
+  });
+
+  it("caps oversized request timeouts before scheduling aborts", async () => {
+    const timeoutSpy = vi
+      .spyOn(globalThis, "setTimeout")
+      .mockReturnValue(1 as unknown as ReturnType<typeof setTimeout>);
+    vi.spyOn(globalThis, "clearTimeout").mockImplementation(() => undefined);
+    mockFetch.mockResolvedValueOnce(jsonResponse({ id: "dm-channel-capped" }, 201));
+
+    const client = createMockClient();
+
+    await createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+      timeoutMs: MAX_TIMER_TIMEOUT_MS + 1_000_000,
+      maxRetries: 0,
+    });
+
+    expect(timeoutSpy).toHaveBeenCalledWith(expect.any(Function), MAX_TIMER_TIMEOUT_MS);
+  });
+
+  it("uses exponential backoff with jitter between retries", async () => {
+    const delays: number[] = [];
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503 Service Unavailable"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503 Service Unavailable"))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-delay" }, 201));
+
+    const client = createMockClient();
+
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 100,
+        maxDelayMs: 1000,
+        onRetry: (attempt, delayMs) => {
+          delays.push(delayMs);
+        },
+      }),
+    );
+
+    expect(delays).toHaveLength(2);
+    // First retry: exponentialDelay = 100ms, jitter = 0-100ms, total = 100-200ms
+    expect(delays[0]).toBeGreaterThanOrEqual(100);
+    expect(delays[0]).toBeLessThanOrEqual(200);
+    // Second retry: exponentialDelay = 200ms, jitter = 0-200ms, total = 200-400ms
+    expect(delays[1]).toBeGreaterThanOrEqual(200);
+    expect(delays[1]).toBeLessThanOrEqual(400);
+  });
+
+  it("respects maxDelayMs cap", async () => {
+    const delays: number[] = [];
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockRejectedValueOnce(new Error("Mattermost API 503"))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-max" }, 201));
+
+    const client = createMockClient();
+
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 4,
+        initialDelayMs: 1000,
+        maxDelayMs: 2500,
+        onRetry: (attempt, delayMs) => {
+          delays.push(delayMs);
+        },
+      }),
+    );
+
+    expect(delays).toHaveLength(4);
+    // All delays should be capped at maxDelayMs
+    delays.forEach((delay) => {
+      expect(delay).toBeLessThanOrEqual(2500);
+    });
+  });
+
+  it("does not retry on 4xx errors even if message contains retryable keywords", async () => {
+    // This tests the fix for false positives where a 400 error with "timeout" in the message
+    // would incorrectly be retried
+    mockFetch.mockResolvedValueOnce(
+      jsonResponse({ message: "Request timeout: connection timed out" }, 400),
+    );
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("400");
+
+    // Should not retry - only called once
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not retry on 403 Forbidden even with 'abort' in message", async () => {
+    mockFetch.mockResolvedValueOnce(jsonResponse({ message: "Request aborted: forbidden" }, 403));
+
+    const client = createMockClient();
+
+    const run = suppressUnhandled(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+    await expect(resolveRetryRun(run)).rejects.toThrow("403");
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+  });
+
+  it("passes AbortSignal to fetch for timeout support", async () => {
+    let capturedSignal: AbortSignal | undefined;
+    mockFetch.mockImplementationOnce((url, init) => {
+      capturedSignal = init?.signal ?? undefined;
+      return Promise.resolve(jsonResponse({ id: "dm-channel-signal" }, 201));
+    });
+
+    const client = createMockClient();
+    await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        timeoutMs: 5000,
+      }),
+    );
+
+    expect(capturedSignal).toBeInstanceOf(AbortSignal);
+    expect(capturedSignal?.aborted).toBe(false);
+  });
+
+  it("retries on 5xx even if error message contains 4xx substring", async () => {
+    // This tests the fix for the ordering bug: 503 with "upstream 404" should be retried
+    mockFetch
+      .mockRejectedValueOnce(new Error("Mattermost API 503: upstream returned 404 Not Found"))
+      .mockResolvedValueOnce(jsonResponse({ id: "dm-channel-5xx-with-404" }, 201));
+
+    const client = createMockClient();
+
+    const result = await resolveRetryRun(
+      createMattermostDirectChannelWithRetry(client, ["user-1", "user-2"], {
+        maxRetries: 3,
+        initialDelayMs: 10,
+      }),
+    );
+
+    // Should retry and succeed on second attempt
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(result.id).toBe("dm-channel-5xx-with-404");
+  });
+});

extensions/mattermost/src/mattermost/client.test.ts

@@ -0,0 +1,566 @@
+// Mattermost tests cover client plugin behavior.
+import { describe, expect, it, vi } from "vitest";
+
+const fetchWithSsrFGuardMock = vi.hoisted(() => vi.fn());
+
+vi.mock("openclaw/plugin-sdk/ssrf-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/ssrf-runtime")>();
+  return {
+    ...actual,
+    fetchWithSsrFGuard: (...args: unknown[]) => fetchWithSsrFGuardMock(...args),
+  };
+});
+
+import {
+  createMattermostClient,
+  createMattermostPost,
+  normalizeMattermostBaseUrl,
+  readMattermostError,
+  updateMattermostPost,
+} from "./client.js";
+
+// ── Helper: mock fetch that captures requests ────────────────────────
+
+function createMockFetch(response?: { status?: number; body?: unknown; contentType?: string }) {
+  const status = response?.status ?? 200;
+  const body = response?.body ?? {};
+  const contentType = response?.contentType ?? "application/json";
+
+  const calls: Array<{ url: string; init?: RequestInit }> = [];
+
+  const mockFetch = vi.fn(async (url: string | URL | Request, init?: RequestInit) => {
+    const urlStr = requestUrl(url);
+    calls.push({ url: urlStr, init });
+    return new Response(JSON.stringify(body), {
+      status,
+      headers: { "content-type": contentType },
+    });
+  });
+
+  return { mockFetch: mockFetch as typeof fetch, calls };
+}
+
+function requestUrl(url: string | URL | Request): string {
+  if (typeof url === "string") {
+    return url;
+  }
+  if (url instanceof URL) {
+    return url.toString();
+  }
+  return url.url;
+}
+
+function parseRequestJson(init: RequestInit | undefined): Record<string, unknown> {
+  if (typeof init?.body !== "string") {
+    throw new Error("expected JSON request body");
+  }
+  const parsed: unknown = JSON.parse(init.body);
+  if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
+    throw new Error("expected JSON object request body");
+  }
+  return parsed as Record<string, unknown>;
+}
+
+function streamingMattermostResponse(body: unknown): {
+  response: Response;
+  arrayBuffer: ReturnType<typeof vi.fn>;
+} {
+  const encoded = new TextEncoder().encode(JSON.stringify(body));
+  const stream = new ReadableStream<Uint8Array>({
+    start(controller) {
+      controller.enqueue(encoded);
+      controller.close();
+    },
+  });
+  const arrayBuffer = vi.fn(async () => {
+    throw new Error("guarded Mattermost responses must stay streaming");
+  });
+  return {
+    response: {
+      ok: true,
+      status: 200,
+      statusText: "OK",
+      headers: new Headers({ "content-type": "application/json" }),
+      body: stream,
+      arrayBuffer,
+    } as unknown as Response,
+    arrayBuffer,
+  };
+}
+
+function cancelTrackedResponse(
+  text: string,
+  init: ResponseInit,
+): {
+  response: Response;
+  wasCanceled: () => boolean;
+} {
+  let canceled = false;
+  const stream = new ReadableStream<Uint8Array>({
+    start(controller) {
+      controller.enqueue(new TextEncoder().encode(text));
+    },
+    cancel() {
+      canceled = true;
+    },
+  });
+  return {
+    response: new Response(stream, init),
+    wasCanceled: () => canceled,
+  };
+}
+
+function createTestClient(response?: { status?: number; body?: unknown; contentType?: string }) {
+  const { mockFetch, calls } = createMockFetch(response);
+  const client = createMattermostClient({
+    baseUrl: "http://localhost:8065",
+    botToken: "tok",
+    fetchImpl: mockFetch,
+  });
+  return { client, calls };
+}
+
+async function updatePostAndCapture(
+  update: Parameters<typeof updateMattermostPost>[2],
+  response?: { status?: number; body?: unknown; contentType?: string },
+) {
+  const { client, calls } = createTestClient(response ?? { body: { id: "post1" } });
+  await updateMattermostPost(client, "post1", update);
+  return {
+    calls,
+    body: parseRequestJson(calls[0].init),
+  };
+}
+
+// ── normalizeMattermostBaseUrl ────────────────────────────────────────
+
+describe("normalizeMattermostBaseUrl", () => {
+  it("strips trailing slashes", () => {
+    expect(normalizeMattermostBaseUrl("http://localhost:8065/")).toBe("http://localhost:8065");
+  });
+
+  it("strips /api/v4 suffix", () => {
+    expect(normalizeMattermostBaseUrl("http://localhost:8065/api/v4")).toBe(
+      "http://localhost:8065",
+    );
+  });
+
+  it("returns undefined for empty input", () => {
+    expect(normalizeMattermostBaseUrl("")).toBeUndefined();
+    expect(normalizeMattermostBaseUrl(null)).toBeUndefined();
+    expect(normalizeMattermostBaseUrl(undefined)).toBeUndefined();
+  });
+
+  it("preserves valid base URL", () => {
+    expect(normalizeMattermostBaseUrl("http://mm.example.com")).toBe("http://mm.example.com");
+  });
+});
+
+// ── readMattermostError ───────────────────────────────────────────────
+
+describe("readMattermostError", () => {
+  it("bounds null-body JSON errors without response.json/text", async () => {
+    const response = new Response(null, {
+      status: 401,
+      headers: { "content-type": "application/json" },
+    });
+    const jsonSpy = vi.spyOn(response, "json").mockRejectedValue(new Error("unbounded"));
+    const textSpy = vi.spyOn(response, "text").mockRejectedValue(new Error("unbounded"));
+
+    await expect(readMattermostError(response)).resolves.toBe("");
+
+    expect(jsonSpy).not.toHaveBeenCalled();
+    expect(textSpy).not.toHaveBeenCalled();
+  });
+
+  it("parses bounded JSON error messages from response bodies", async () => {
+    const response = new Response(JSON.stringify({ message: "invalid token", id: "app.error" }), {
+      status: 401,
+      headers: { "content-type": "application/json" },
+    });
+    const jsonSpy = vi.spyOn(response, "json").mockRejectedValue(new Error("unbounded"));
+    const textSpy = vi.spyOn(response, "text").mockRejectedValue(new Error("unbounded"));
+
+    await expect(readMattermostError(response)).resolves.toBe("invalid token");
+
+    expect(jsonSpy).not.toHaveBeenCalled();
+    expect(textSpy).not.toHaveBeenCalled();
+  });
+});
+
+// ── createMattermostClient ───────────────────────────────────────────
+
+describe("createMattermostClient", () => {
+  it("keeps guarded Mattermost responses streaming until callers consume them", async () => {
+    const release = vi.fn(async () => {});
+    const { response, arrayBuffer } = streamingMattermostResponse({ id: "u1" });
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({ response, release });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    await expect(client.request("/users/me")).resolves.toEqual({ id: "u1" });
+
+    expect(arrayBuffer).not.toHaveBeenCalled();
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("reads guarded null-body Mattermost errors without response.json/text", async () => {
+    const release = vi.fn(async () => {});
+    const response = new Response(null, {
+      status: 503,
+      statusText: "Service Unavailable",
+      headers: { "content-type": "application/json" },
+    });
+    const jsonSpy = vi.spyOn(response, "json").mockRejectedValue(new Error("unbounded"));
+    const textSpy = vi.spyOn(response, "text").mockRejectedValue(new Error("unbounded"));
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({ response, release });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    await expect(client.request("/users/me")).rejects.toThrow(
+      "Mattermost API 503 Service Unavailable: unknown error",
+    );
+    expect(jsonSpy).not.toHaveBeenCalled();
+    expect(textSpy).not.toHaveBeenCalled();
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("bounds and cancels guarded Mattermost error bodies", async () => {
+    const release = vi.fn(async () => {});
+    const tracked = cancelTrackedResponse(`${"upstream unavailable ".repeat(512)}tail`, {
+      status: 503,
+      statusText: "Service Unavailable",
+      headers: { "content-type": "text/plain" },
+    });
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({ response: tracked.response, release });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    let caught: Error | undefined;
+    try {
+      await client.request("/users/me");
+    } catch (error) {
+      caught = error as Error;
+    }
+
+    expect(caught?.message).toContain("Mattermost API 503 Service Unavailable");
+    expect(caught?.message).toContain("upstream unavailable");
+    expect(caught?.message).not.toContain("tail");
+    expect(caught?.message.length).toBeLessThan(8_300);
+    expect(tracked.wasCanceled()).toBe(true);
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("bounds and cancels oversized guarded Mattermost success JSON bodies", async () => {
+    const release = vi.fn(async () => {});
+    let canceled = false;
+    let pulled = 0;
+    const oversizeChunk = new Uint8Array(2 * 1024 * 1024).fill(0x7b); // 2 MiB of '{'
+    const stream = new ReadableStream<Uint8Array>({
+      pull(controller) {
+        pulled += 1;
+        // Flood far past the 16 MiB JSON cap; an unbounded reader would buffer
+        // the whole stream before parsing.
+        controller.enqueue(oversizeChunk);
+      },
+      cancel() {
+        canceled = true;
+      },
+    });
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({
+      response: new Response(stream, {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release,
+    });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    let caught: Error | undefined;
+    try {
+      await client.request("/users/me");
+    } catch (error) {
+      caught = error as Error;
+    }
+
+    expect(caught?.message).toContain("JSON response exceeds 16777216 bytes");
+    // The reader is cancelled at the cap instead of draining the flood: ~8
+    // chunks of 2 MiB reach the 16 MiB ceiling, never the unbounded tail.
+    expect(canceled).toBe(true);
+    expect(pulled).toBeLessThanOrEqual(12);
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("rejects oversized guarded Mattermost success text bodies instead of truncating", async () => {
+    const release = vi.fn(async () => {});
+    const tracked = cancelTrackedResponse(`${"plain success ".repeat(7000)}tail`, {
+      status: 200,
+      headers: { "content-type": "text/plain" },
+    });
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({ response: tracked.response, release });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    await expect(client.request("/users/me")).rejects.toThrow(
+      "Mattermost API /users/me: text response exceeds 65536 bytes",
+    );
+    expect(tracked.wasCanceled()).toBe(true);
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("releases guarded Mattermost responses when upstream body reads fail", async () => {
+    const release = vi.fn(async () => {});
+    const stream = new ReadableStream<Uint8Array>({
+      pull() {
+        throw new Error("upstream body failed");
+      },
+    });
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({
+      response: new Response(stream, {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release,
+    });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+    });
+
+    await expect(client.request("/users/me")).rejects.toThrow("upstream body failed");
+    expect(release).toHaveBeenCalledTimes(1);
+  });
+
+  it("creates a client with normalized baseUrl", () => {
+    const { mockFetch } = createMockFetch();
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065/",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    expect(client.baseUrl).toBe("http://localhost:8065");
+    expect(client.apiBaseUrl).toBe("http://localhost:8065/api/v4");
+  });
+
+  it("throws on empty baseUrl", () => {
+    expect(() => createMattermostClient({ baseUrl: "", botToken: "tok" })).toThrow(
+      "baseUrl is required",
+    );
+  });
+
+  it("sends Authorization header with Bearer token", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "u1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "my-secret-token",
+      fetchImpl: mockFetch,
+    });
+    await client.request("/users/me");
+    const headers = new Headers(calls[0].init?.headers);
+    expect(headers.get("Authorization")).toBe("Bearer my-secret-token");
+  });
+
+  it("sets Content-Type for string bodies", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "p1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    await client.request("/posts", { method: "POST", body: JSON.stringify({ message: "hi" }) });
+    const headers = new Headers(calls[0].init?.headers);
+    expect(headers.get("Content-Type")).toBe("application/json");
+  });
+
+  it("throws on non-ok responses", async () => {
+    const { mockFetch } = createMockFetch({
+      status: 404,
+      body: { message: "Not Found" },
+    });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+    await expect(client.request("/missing")).rejects.toThrow("Mattermost API 404");
+  });
+
+  it("returns undefined on 204 responses", async () => {
+    const fetchImpl = vi.fn<typeof fetch>(async () => {
+      return new Response(null, { status: 204 });
+    });
+    const client = createMattermostClient({
+      baseUrl: "https://chat.example.com",
+      botToken: "test-token",
+      fetchImpl,
+    });
+    const result = await client.request<unknown>("/anything", { method: "DELETE" });
+    expect(result).toBeUndefined();
+  });
+});
+
+// ── createMattermostPost ─────────────────────────────────────────────
+
+describe("createMattermostPost", () => {
+  it("sends channel_id and message", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post1" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Hello world",
+    });
+
+    const body = parseRequestJson(calls[0].init);
+    expect(body.channel_id).toBe("ch123");
+    expect(body.message).toBe("Hello world");
+  });
+
+  it("includes rootId when provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post2" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Reply",
+      rootId: "root456",
+    });
+
+    const body = parseRequestJson(calls[0].init);
+    expect(body.root_id).toBe("root456");
+  });
+
+  it("includes fileIds when provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post3" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "With file",
+      fileIds: ["file1", "file2"],
+    });
+
+    const body = parseRequestJson(calls[0].init);
+    expect(body.file_ids).toEqual(["file1", "file2"]);
+  });
+
+  it("includes props when provided (for interactive buttons)", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post4" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    const props = {
+      attachments: [
+        {
+          text: "Choose:",
+          actions: [{ id: "btn1", type: "button", name: "Click" }],
+        },
+      ],
+    };
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "Pick an option",
+      props,
+    });
+
+    const body = parseRequestJson(calls[0].init);
+    expect(body).toEqual({
+      channel_id: "ch123",
+      message: "Pick an option",
+      props,
+    });
+  });
+
+  it("omits props when not provided", async () => {
+    const { mockFetch, calls } = createMockFetch({ body: { id: "post5" } });
+    const client = createMattermostClient({
+      baseUrl: "http://localhost:8065",
+      botToken: "tok",
+      fetchImpl: mockFetch,
+    });
+
+    await createMattermostPost(client, {
+      channelId: "ch123",
+      message: "No props",
+    });
+
+    const body = parseRequestJson(calls[0].init);
+    expect(body.props).toBeUndefined();
+  });
+});
+
+// ── updateMattermostPost ─────────────────────────────────────────────
+
+describe("updateMattermostPost", () => {
+  it("sends PUT to /posts/{id}", async () => {
+    const { calls } = await updatePostAndCapture({ message: "Updated" });
+
+    const firstCall = calls[0];
+    if (!firstCall) {
+      throw new Error("expected Mattermost update post request");
+    }
+    expect(firstCall.url).toContain("/posts/post1");
+    if (!firstCall.init) {
+      throw new Error("expected Mattermost update post request init");
+    }
+    expect(firstCall.init.method).toBe("PUT");
+  });
+
+  it("includes post id in the body", async () => {
+    const { body } = await updatePostAndCapture({ message: "Updated" });
+    expect(body.id).toBe("post1");
+    expect(body.message).toBe("Updated");
+  });
+
+  it("includes props for button completion updates", async () => {
+    const { body } = await updatePostAndCapture({
+      message: "Original message",
+      props: {
+        attachments: [{ text: "✓ **do_now** selected by @tony" }],
+      },
+    });
+    expect(body).toEqual({
+      id: "post1",
+      message: "Original message",
+      props: {
+        attachments: [{ text: "✓ **do_now** selected by @tony" }],
+      },
+    });
+  });
+
+  it("omits message when not provided", async () => {
+    const { body } = await updatePostAndCapture({
+      props: { attachments: [] },
+    });
+    expect(body.id).toBe("post1");
+    expect(body.message).toBeUndefined();
+    expect(body.props).toEqual({ attachments: [] });
+  });
+});

extensions/mattermost/src/mattermost/client.ts

@@ -0,0 +1,700 @@
+// Mattermost plugin module implements client behavior.
+import { resolveTimerTimeoutMs } from "openclaw/plugin-sdk/number-runtime";
+import {
+  readProviderJsonResponse,
+  readResponseTextLimited,
+} from "openclaw/plugin-sdk/provider-http";
+import { readResponseWithLimit } from "openclaw/plugin-sdk/response-limit-runtime";
+import { sleep } from "openclaw/plugin-sdk/runtime-env";
+import {
+  fetchWithSsrFGuard,
+  ssrfPolicyFromPrivateNetworkOptIn,
+} from "openclaw/plugin-sdk/ssrf-runtime";
+import {
+  normalizeLowercaseStringOrEmpty,
+  normalizeOptionalString,
+} from "openclaw/plugin-sdk/string-coerce-runtime";
+import { z } from "zod";
+
+const MATTERMOST_ERROR_BODY_LIMIT_BYTES = 8 * 1024;
+// Mattermost REST control-plane JSON (posts, users, channels, file-upload
+// results) stays well under a megabyte; cap successful JSON the same way the
+// shared provider path is capped so an untrusted/self-hosted homeserver cannot
+// stream an unbounded body into the runtime before parsing.
+// Non-JSON success bodies are a rare fallback (the API is JSON-first); keep a
+// generous text budget but still bound it instead of buffering the whole stream.
+const MATTERMOST_TEXT_RESPONSE_LIMIT_BYTES = 64 * 1024;
+const NULL_BODY_STATUSES = new Set([101, 204, 205, 304]);
+
+export type MattermostFetch = (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
+
+export type MattermostClient = {
+  baseUrl: string;
+  apiBaseUrl: string;
+  token: string;
+  request: <T>(path: string, init?: RequestInit) => Promise<T>;
+  /** Guarded fetch implementation; use in place of raw fetch for outbound requests. */
+  fetchImpl: MattermostFetch;
+};
+
+export type MattermostUser = {
+  id: string;
+  username?: string | null;
+  nickname?: string | null;
+  first_name?: string | null;
+  last_name?: string | null;
+  update_at?: number;
+};
+
+export type MattermostChannel = {
+  id: string;
+  name?: string | null;
+  display_name?: string | null;
+  type?: string | null;
+  team_id?: string | null;
+};
+
+export const MattermostPostSchema = z
+  .object({
+    id: z.string(),
+    user_id: z.string().nullable().optional(),
+    channel_id: z.string().nullable().optional(),
+    message: z.string().nullable().optional(),
+    file_ids: z.array(z.string()).nullable().optional(),
+    type: z.string().nullable().optional(),
+    root_id: z.string().nullable().optional(),
+    create_at: z.number().nullable().optional(),
+    props: z.record(z.string(), z.unknown()).nullable().optional(),
+  })
+  .passthrough();
+
+export type MattermostPost = z.infer<typeof MattermostPostSchema>;
+
+export type MattermostFileInfo = {
+  id: string;
+  name?: string | null;
+  mime_type?: string | null;
+  size?: number | null;
+};
+
+export function normalizeMattermostBaseUrl(raw?: string | null): string | undefined {
+  const trimmed = raw?.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  const withoutTrailing = trimmed.replace(/\/+$/, "");
+  return withoutTrailing.replace(/\/api\/v4$/i, "");
+}
+
+function buildMattermostApiUrl(baseUrl: string, path: string): string {
+  const normalized = normalizeMattermostBaseUrl(baseUrl);
+  if (!normalized) {
+    throw new Error("Mattermost baseUrl is required");
+  }
+  const suffix = path.startsWith("/") ? path : `/${path}`;
+  return `${normalized}/api/v4${suffix}`;
+}
+
+async function readMattermostSuccessText(res: Response, path: string): Promise<string> {
+  const bytes = await readResponseWithLimit(res, MATTERMOST_TEXT_RESPONSE_LIMIT_BYTES, {
+    onOverflow: ({ maxBytes }) =>
+      new Error(`Mattermost API ${path}: text response exceeds ${maxBytes} bytes`),
+  });
+  return new TextDecoder().decode(bytes);
+}
+
+export async function readMattermostError(res: Response): Promise<string> {
+  const contentType = res.headers.get("content-type") ?? "";
+  const text = await readResponseTextLimited(res, MATTERMOST_ERROR_BODY_LIMIT_BYTES);
+  if (contentType.includes("application/json")) {
+    try {
+      const data = JSON.parse(text) as { message?: string } | undefined;
+      if (data?.message) {
+        return data.message;
+      }
+      return JSON.stringify(data);
+    } catch {
+      return text;
+    }
+  }
+  return text;
+}
+
+function responseWithRelease(response: Response, release: () => Promise<void>): Response {
+  let released = false;
+  const releaseOnce = async () => {
+    if (released) {
+      return;
+    }
+    released = true;
+    await release();
+  };
+
+  if (!response.body || NULL_BODY_STATUSES.has(response.status)) {
+    void releaseOnce();
+    return new Response(null, {
+      status: response.status,
+      statusText: response.statusText,
+      headers: response.headers,
+    });
+  }
+
+  const reader = response.body.getReader();
+  const body = new ReadableStream<Uint8Array>({
+    async pull(controller) {
+      try {
+        const { done, value } = await reader.read();
+        if (done) {
+          await releaseOnce();
+          controller.close();
+          return;
+        }
+        if (value) {
+          controller.enqueue(value);
+        }
+      } catch (error) {
+        await releaseOnce();
+        throw error;
+      }
+    },
+    async cancel(reason) {
+      await reader.cancel(reason).catch(() => undefined);
+      await releaseOnce();
+    },
+  });
+
+  return new Response(body, {
+    status: response.status,
+    statusText: response.statusText,
+    headers: response.headers,
+  });
+}
+
+export function createMattermostClient(params: {
+  baseUrl: string;
+  botToken: string;
+  fetchImpl?: MattermostFetch;
+  /** Allow requests to private/internal IPs (self-hosted/LAN deployments). */
+  allowPrivateNetwork?: boolean;
+}): MattermostClient {
+  const baseUrl = normalizeMattermostBaseUrl(params.baseUrl);
+  if (!baseUrl) {
+    throw new Error("Mattermost baseUrl is required");
+  }
+  const apiBaseUrl = `${baseUrl}/api/v4`;
+  const token = params.botToken.trim();
+  // When no custom fetchImpl is provided (production path), use an SSRF-guarded wrapper
+  // that validates the target URL before making the request (DNS rebinding protection etc.).
+  // A custom fetchImpl is accepted for testing and special cases.
+  const externalFetchImpl = params.fetchImpl;
+
+  const guardedFetchImpl: MattermostFetch = async (input, init) => {
+    const url =
+      typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
+    const { response, release } = await fetchWithSsrFGuard({
+      url,
+      init,
+      auditContext: "mattermost-api",
+      policy: ssrfPolicyFromPrivateNetworkOptIn(params.allowPrivateNetwork),
+    });
+    return responseWithRelease(response, release);
+  };
+
+  const fetchImpl = externalFetchImpl ?? guardedFetchImpl;
+
+  const request = async <T>(path: string, init?: RequestInit): Promise<T> => {
+    const url = buildMattermostApiUrl(baseUrl, path);
+    const headers = new Headers(init?.headers);
+    headers.set("Authorization", `Bearer ${token}`);
+    if (typeof init?.body === "string" && !headers.has("Content-Type")) {
+      headers.set("Content-Type", "application/json");
+    }
+    const res = await fetchImpl(url, { ...init, headers });
+    if (!res.ok) {
+      const detail = await readMattermostError(res);
+      throw new Error(
+        `Mattermost API ${res.status} ${res.statusText}: ${detail || "unknown error"}`,
+      );
+    }
+
+    if (res.status === 204) {
+      return undefined as T;
+    }
+
+    const contentType = res.headers.get("content-type") ?? "";
+    if (contentType.includes("application/json")) {
+      return await readProviderJsonResponse<T>(res, `Mattermost API ${path}`);
+    }
+    return (await readMattermostSuccessText(res, path)) as T;
+  };
+
+  return { baseUrl, apiBaseUrl, token, request, fetchImpl };
+}
+
+export async function fetchMattermostMe(client: MattermostClient): Promise<MattermostUser> {
+  return await client.request<MattermostUser>("/users/me");
+}
+
+export async function fetchMattermostUser(
+  client: MattermostClient,
+  userId: string,
+): Promise<MattermostUser> {
+  return await client.request<MattermostUser>(`/users/${userId}`);
+}
+
+export async function fetchMattermostUserByUsername(
+  client: MattermostClient,
+  username: string,
+): Promise<MattermostUser> {
+  return await client.request<MattermostUser>(`/users/username/${encodeURIComponent(username)}`);
+}
+
+export async function fetchMattermostChannel(
+  client: MattermostClient,
+  channelId: string,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>(`/channels/${channelId}`);
+}
+
+export async function fetchMattermostChannelByName(
+  client: MattermostClient,
+  teamId: string,
+  channelName: string,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>(
+    `/teams/${teamId}/channels/name/${encodeURIComponent(channelName)}`,
+  );
+}
+
+export async function sendMattermostTyping(
+  client: MattermostClient,
+  params: { channelId: string; parentId?: string },
+): Promise<void> {
+  const payload: Record<string, string> = {
+    channel_id: params.channelId,
+  };
+  const parentId = params.parentId?.trim();
+  if (parentId) {
+    payload.parent_id = parentId;
+  }
+  await client.request<Record<string, unknown>>("/users/me/typing", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function createMattermostDirectChannel(
+  client: MattermostClient,
+  userIds: string[],
+  signal?: AbortSignal,
+): Promise<MattermostChannel> {
+  return await client.request<MattermostChannel>("/channels/direct", {
+    method: "POST",
+    body: JSON.stringify(userIds),
+    signal,
+  });
+}
+
+export type CreateDmChannelRetryOptions = {
+  /** Maximum number of retry attempts (default: 3) */
+  maxRetries?: number;
+  /** Initial delay in milliseconds (default: 1000) */
+  initialDelayMs?: number;
+  /** Maximum delay in milliseconds (default: 10000) */
+  maxDelayMs?: number;
+  /** Timeout for each individual request in milliseconds (default: 30000) */
+  timeoutMs?: number;
+  /** Optional logger for retry events */
+  onRetry?: (attempt: number, delayMs: number, error: Error) => void;
+};
+
+const DM_REPLY_DELIVERY_BARRIER_SLACK_MS = 60_000;
+
+/** Covers DM creation retries without extending channel-delivery stalls. */
+export function resolveMattermostReplyDeliveryBarrierTimeoutMs(params: {
+  isDirect: boolean;
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+  queuedCounts: Readonly<Record<"tool" | "block" | "final", number>>;
+  humanDelayBudgetMs?: number;
+}): number | undefined {
+  if (!params.isDirect) {
+    return undefined;
+  }
+  const deliveryCount = Object.values(params.queuedCounts).reduce((sum, count) => sum + count, 0);
+  if (deliveryCount === 0) {
+    return undefined;
+  }
+  const maxRetries = params.dmRetryOptions?.maxRetries ?? 3;
+  const maxDelayMs = params.dmRetryOptions?.maxDelayMs ?? 10_000;
+  const timeoutMs = params.dmRetryOptions?.timeoutMs ?? 30_000;
+  const perDeliveryTimeoutMs =
+    (maxRetries + 1) * timeoutMs + maxRetries * maxDelayMs + DM_REPLY_DELIVERY_BARRIER_SLACK_MS;
+  const totalTimeoutMs =
+    perDeliveryTimeoutMs * deliveryCount + Math.max(0, params.humanDelayBudgetMs ?? 0);
+  return resolveTimerTimeoutMs(
+    Number.isFinite(totalTimeoutMs) ? totalTimeoutMs : Number.MAX_SAFE_INTEGER,
+    perDeliveryTimeoutMs,
+  );
+}
+
+const RETRYABLE_NETWORK_ERROR_CODES = new Set([
+  "ECONNRESET",
+  "ECONNREFUSED",
+  "ETIMEDOUT",
+  "ESOCKETTIMEDOUT",
+  "ECONNABORTED",
+  "ENOTFOUND",
+  "EAI_AGAIN",
+  "EHOSTUNREACH",
+  "ENETUNREACH",
+  "EPIPE",
+  "UND_ERR_CONNECT_TIMEOUT",
+  "UND_ERR_DNS_RESOLVE_FAILED",
+  "UND_ERR_CONNECT",
+  "UND_ERR_SOCKET",
+  "UND_ERR_HEADERS_TIMEOUT",
+  "UND_ERR_BODY_TIMEOUT",
+]);
+
+const RETRYABLE_NETWORK_ERROR_NAMES = new Set([
+  "AbortError",
+  "TimeoutError",
+  "ConnectTimeoutError",
+  "HeadersTimeoutError",
+  "BodyTimeoutError",
+]);
+
+const RETRYABLE_NETWORK_MESSAGE_SNIPPETS = [
+  "network error",
+  "timeout",
+  "timed out",
+  "abort",
+  "connection refused",
+  "econnreset",
+  "econnrefused",
+  "etimedout",
+  "enotfound",
+  "socket hang up",
+  "getaddrinfo",
+];
+
+/**
+ * Creates a Mattermost DM channel with exponential backoff retry logic.
+ * Retries on transient errors (429, 5xx, network errors) but not on
+ * client errors (4xx except 429) or permanent failures.
+ */
+export async function createMattermostDirectChannelWithRetry(
+  client: MattermostClient,
+  userIds: string[],
+  options: CreateDmChannelRetryOptions = {},
+): Promise<MattermostChannel> {
+  const {
+    maxRetries = 3,
+    initialDelayMs = 1000,
+    maxDelayMs = 10000,
+    timeoutMs: rawTimeoutMs = 30000,
+    onRetry,
+  } = options;
+  const timeoutMs = resolveTimerTimeoutMs(rawTimeoutMs, 30000);
+
+  let lastError: Error | undefined;
+
+  for (let attempt = 0; attempt <= maxRetries; attempt++) {
+    try {
+      // Use AbortController for per-request timeout
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), timeoutMs);
+
+      try {
+        const result = await createMattermostDirectChannel(client, userIds, controller.signal);
+        return result;
+      } finally {
+        clearTimeout(timeoutId);
+      }
+    } catch (err) {
+      lastError = err instanceof Error ? err : new Error(String(err));
+
+      // Don't retry on the last attempt
+      if (attempt >= maxRetries) {
+        break;
+      }
+
+      // Check if error is retryable
+      if (!isRetryableError(lastError)) {
+        throw lastError;
+      }
+
+      // Calculate exponential backoff delay with full-jitter
+      // Jitter is proportional to the exponential delay, not a fixed 1000ms
+      // This ensures backoff behaves correctly for small delay configurations
+      const exponentialDelay = initialDelayMs * 2 ** attempt;
+      const jitter = Math.random() * exponentialDelay;
+      const delayMs = Math.min(exponentialDelay + jitter, maxDelayMs);
+
+      if (onRetry) {
+        onRetry(attempt + 1, delayMs, lastError);
+      }
+
+      // Wait before retrying
+      await sleep(delayMs);
+    }
+  }
+
+  throw lastError ?? new Error("Failed to create DM channel after retries");
+}
+
+function isRetryableError(error: Error): boolean {
+  const candidates = collectErrorCandidates(error);
+  const messages = candidates
+    .map((candidate) => normalizeLowercaseStringOrEmpty(readErrorMessage(candidate)))
+    .filter((message): message is string => Boolean(message));
+
+  // Retry on 5xx server errors FIRST (before checking 4xx)
+  // Use "mattermost api" prefix to avoid matching port numbers (e.g., :443) or IP octets
+  // This prevents misclassification when a 5xx error detail contains a 4xx substring
+  // e.g., "Mattermost API 503: upstream returned 404"
+  if (messages.some((message) => /mattermost api 5\d{2}\b/.test(message))) {
+    return true;
+  }
+
+  // Check for explicit 429 rate limiting FIRST (before generic "429" text match)
+  // This avoids retrying when error detail contains "429" but it's not the status code
+  if (
+    messages.some(
+      (message) => /mattermost api 429\b/.test(message) || message.includes("too many requests"),
+    )
+  ) {
+    return true;
+  }
+
+  // Check for explicit 4xx status codes - these are client errors and should NOT be retried
+  // (except 429 which is handled above)
+  // Use "mattermost api" prefix to avoid matching port numbers like :443
+  for (const message of messages) {
+    const clientErrorMatch = message.match(/mattermost api (4\d{2})\b/);
+    if (!clientErrorMatch) {
+      continue;
+    }
+    const statusCode = Number.parseInt(clientErrorMatch[1], 10);
+    if (statusCode >= 400 && statusCode < 500) {
+      return false;
+    }
+  }
+
+  // Retry on network/transient errors only if no explicit Mattermost API status code is present
+  // This avoids false positives like:
+  // - "400 Bad Request: connection timed out" (has status code)
+  // - "connect ECONNRESET 104.18.32.10:443" (has port number, not status)
+  const hasMattermostApiStatusCode = messages.some((message) =>
+    /mattermost api \d{3}\b/.test(message),
+  );
+  if (hasMattermostApiStatusCode) {
+    return false;
+  }
+
+  const codes: string[] = [];
+  for (const candidate of candidates) {
+    const code = readErrorCode(candidate);
+    if (code) {
+      codes.push(code);
+    }
+  }
+  if (codes.some((code) => RETRYABLE_NETWORK_ERROR_CODES.has(code))) {
+    return true;
+  }
+
+  const names: string[] = [];
+  for (const candidate of candidates) {
+    const name = readErrorName(candidate);
+    if (name) {
+      names.push(name);
+    }
+  }
+  if (names.some((name) => RETRYABLE_NETWORK_ERROR_NAMES.has(name))) {
+    return true;
+  }
+
+  return messages.some((message) =>
+    RETRYABLE_NETWORK_MESSAGE_SNIPPETS.some((pattern) => message.includes(pattern)),
+  );
+}
+
+function collectErrorCandidates(error: unknown): unknown[] {
+  const queue: unknown[] = [error];
+  let queueIndex = 0;
+  const seen = new Set<unknown>();
+  const candidates: unknown[] = [];
+
+  while (queueIndex < queue.length) {
+    const current = queue[queueIndex];
+    queueIndex += 1;
+    if (!current || seen.has(current)) {
+      continue;
+    }
+    seen.add(current);
+    candidates.push(current);
+
+    if (typeof current !== "object") {
+      continue;
+    }
+
+    const nested = current as {
+      cause?: unknown;
+      reason?: unknown;
+      errors?: unknown;
+    };
+    queue.push(nested.cause, nested.reason);
+    if (Array.isArray(nested.errors)) {
+      queue.push(...nested.errors);
+    }
+  }
+
+  return candidates;
+}
+
+function readErrorMessage(error: unknown): string | undefined {
+  if (!error || typeof error !== "object") {
+    return undefined;
+  }
+  const message = (error as { message?: unknown }).message;
+  return typeof message === "string" && message.trim() ? message : undefined;
+}
+
+function readErrorName(error: unknown): string | undefined {
+  if (!error || typeof error !== "object") {
+    return undefined;
+  }
+  const name = (error as { name?: unknown }).name;
+  return typeof name === "string" && name.trim() ? name : undefined;
+}
+
+function readErrorCode(error: unknown): string | undefined {
+  if (!error || typeof error !== "object") {
+    return undefined;
+  }
+  const { code, errno } = error as {
+    code?: unknown;
+    errno?: unknown;
+  };
+  const raw = typeof code === "string" && code.trim() ? code : errno;
+  if (typeof raw === "string" && raw.trim()) {
+    return raw.trim().toUpperCase();
+  }
+  if (typeof raw === "number" && Number.isFinite(raw)) {
+    return String(raw);
+  }
+  return undefined;
+}
+
+export async function createMattermostPost(
+  client: MattermostClient,
+  params: {
+    channelId: string;
+    message: string;
+    rootId?: string;
+    fileIds?: string[];
+    props?: Record<string, unknown>;
+  },
+): Promise<MattermostPost> {
+  const payload: Record<string, unknown> = {
+    channel_id: params.channelId,
+    message: params.message,
+  };
+  if (params.rootId) {
+    payload.root_id = params.rootId;
+  }
+  if (params.fileIds?.length) {
+    payload.file_ids = params.fileIds;
+  }
+  if (params.props) {
+    payload.props = params.props;
+  }
+  return await client.request<MattermostPost>("/posts", {
+    method: "POST",
+    body: JSON.stringify(payload),
+  });
+}
+
+export type MattermostTeam = {
+  id: string;
+  name?: string | null;
+  display_name?: string | null;
+};
+
+export async function fetchMattermostUserTeams(
+  client: MattermostClient,
+  userId: string,
+): Promise<MattermostTeam[]> {
+  return await client.request<MattermostTeam[]>(`/users/${userId}/teams`);
+}
+
+export async function updateMattermostPost(
+  client: MattermostClient,
+  postId: string,
+  params: {
+    message?: string;
+    props?: Record<string, unknown>;
+  },
+): Promise<MattermostPost> {
+  const payload: Record<string, unknown> = { id: postId };
+  if (params.message !== undefined) {
+    payload.message = params.message;
+  }
+  if (params.props !== undefined) {
+    payload.props = params.props;
+  }
+  return await client.request<MattermostPost>(`/posts/${postId}`, {
+    method: "PUT",
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function deleteMattermostPost(
+  client: MattermostClient,
+  postId: string,
+): Promise<void> {
+  await client.request<void>(`/posts/${postId}`, {
+    method: "DELETE",
+  });
+}
+
+export async function uploadMattermostFile(
+  client: MattermostClient,
+  params: {
+    channelId: string;
+    buffer: Buffer;
+    fileName: string;
+    contentType?: string;
+  },
+): Promise<MattermostFileInfo> {
+  const form = new FormData();
+  const fileName = normalizeOptionalString(params.fileName) ?? "upload";
+  const bytes = Uint8Array.from(params.buffer);
+  const blob = params.contentType
+    ? new Blob([bytes], { type: params.contentType })
+    : new Blob([bytes]);
+  form.append("files", blob, fileName);
+  form.append("channel_id", params.channelId);
+
+  const res = await client.fetchImpl(`${client.apiBaseUrl}/files`, {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${client.token}`,
+    },
+    body: form,
+  });
+
+  if (!res.ok) {
+    const detail = await readMattermostError(res);
+    throw new Error(`Mattermost API ${res.status} ${res.statusText}: ${detail || "unknown error"}`);
+  }
+  const data = await readProviderJsonResponse<{ file_infos?: MattermostFileInfo[] }>(
+    res,
+    "Mattermost API /files",
+  );
+  const info = data.file_infos?.[0];
+  if (!info?.id) {
+    throw new Error("Mattermost file upload failed");
+  }
+  return info;
+}

extensions/mattermost/src/mattermost/directory.test.ts

@@ -0,0 +1,253 @@
+// Mattermost tests cover directory plugin behavior.
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const {
+  listMattermostAccountIdsMock,
+  resolveMattermostAccountMock,
+  createMattermostClientMock,
+  fetchMattermostMeMock,
+} = vi.hoisted(() => {
+  return {
+    listMattermostAccountIdsMock: vi.fn(),
+    resolveMattermostAccountMock: vi.fn(),
+    createMattermostClientMock: vi.fn(),
+    fetchMattermostMeMock: vi.fn(),
+  };
+});
+
+vi.mock("./accounts.js", () => {
+  return {
+    listMattermostAccountIds: listMattermostAccountIdsMock,
+    resolveMattermostAccount: resolveMattermostAccountMock,
+  };
+});
+
+vi.mock("./client.js", () => {
+  return {
+    createMattermostClient: createMattermostClientMock,
+    fetchMattermostMe: fetchMattermostMeMock,
+  };
+});
+
+let listMattermostDirectoryGroups: typeof import("./directory.js").listMattermostDirectoryGroups;
+let listMattermostDirectoryPeers: typeof import("./directory.js").listMattermostDirectoryPeers;
+
+describe("mattermost directory", () => {
+  beforeAll(async () => {
+    ({ listMattermostDirectoryGroups, listMattermostDirectoryPeers } =
+      await import("./directory.js"));
+  });
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("deduplicates channels across enabled accounts and skips failing accounts", async () => {
+    const clientA = {
+      token: "token-a",
+      request: vi.fn().mockResolvedValueOnce([
+        { id: "chan-1", type: "O", name: "alerts", display_name: "Alerts" },
+        { id: "chan-2", type: "P", name: "ops", display_name: "Ops" },
+        { id: "chan-3", type: "D", name: "dm", display_name: "Direct" },
+      ]),
+    };
+    const clientB = {
+      token: "token-b",
+      request: vi.fn().mockRejectedValue(new Error("expired token")),
+    };
+    const clientC = {
+      token: "token-c",
+      request: vi.fn().mockResolvedValueOnce([
+        { id: "chan-2", type: "P", name: "ops", display_name: "Ops" },
+        { id: "chan-4", type: "O", name: "infra", display_name: "Infra" },
+      ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default", "alerts", "infra"]);
+    resolveMattermostAccountMock.mockImplementation(({ accountId }) => {
+      if (accountId === "disabled") {
+        return { enabled: false };
+      }
+      return { enabled: true, botToken: `token-${accountId}`, baseUrl: "https://chat.example.com" };
+    });
+    createMattermostClientMock
+      .mockReturnValueOnce(clientA)
+      .mockReturnValueOnce(clientB)
+      .mockReturnValueOnce(clientC);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryGroups({
+        cfg: {} as never,
+        runtime: {} as never,
+        query: "  op  ",
+      }),
+    ).resolves.toEqual([{ kind: "group", id: "channel:chan-2", name: "ops", handle: "Ops" }]);
+  });
+
+  it("uses the first healthy client for peers and filters self and blanks", async () => {
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce([{ user_id: "me-1" }, { user_id: "user-1" }, { user_id: "user-2" }])
+        .mockResolvedValueOnce([
+          {
+            id: "user-1",
+            username: "alice",
+            first_name: "Alice",
+            last_name: "Ng",
+          },
+          {
+            id: "user-2",
+            username: "bob",
+            nickname: "Bobby",
+          },
+          {
+            id: "me-1",
+            username: "self",
+          },
+        ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+      }),
+    ).resolves.toEqual([
+      { kind: "user", id: "user:user-1", name: "alice", handle: "Alice Ng" },
+      { kind: "user", id: "user:user-2", name: "bob", handle: "Bobby" },
+    ]);
+  });
+
+  it("paginates team members before resolving peer directory users in batches", async () => {
+    const firstPageMembers = Array.from({ length: 200 }, (_, index) => ({
+      user_id: `user-${index + 1}`,
+    }));
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce(firstPageMembers)
+        .mockResolvedValueOnce([{ user_id: "user-201" }, { user_id: "user-202" }])
+        .mockResolvedValueOnce([{ id: "user-1", username: "alice" }])
+        .mockResolvedValueOnce([
+          { id: "user-201", username: "zara" },
+          { id: "user-202", username: "yuki" },
+        ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+      }),
+    ).resolves.toEqual([
+      { kind: "user", id: "user:user-1", name: "alice", handle: undefined },
+      { kind: "user", id: "user:user-201", name: "zara", handle: undefined },
+      { kind: "user", id: "user:user-202", name: "yuki", handle: undefined },
+    ]);
+
+    expect(client.request).toHaveBeenNthCalledWith(2, "/teams/team-1/members?page=0&per_page=200");
+    expect(client.request).toHaveBeenNthCalledWith(3, "/teams/team-1/members?page=1&per_page=200");
+    expect(client.request).toHaveBeenNthCalledWith(4, "/users/ids", {
+      method: "POST",
+      body: JSON.stringify(firstPageMembers.map((member) => member.user_id)),
+    });
+    expect(client.request).toHaveBeenNthCalledWith(5, "/users/ids", {
+      method: "POST",
+      body: JSON.stringify(["user-201", "user-202"]),
+    });
+  });
+
+  it("applies peer limits after resolving users", async () => {
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce([{ user_id: "missing-user" }, { user_id: "user-2" }])
+        .mockResolvedValueOnce([{ id: "user-2", username: "bob" }]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+        limit: 1,
+      }),
+    ).resolves.toEqual([{ kind: "user", id: "user:user-2", name: "bob", handle: undefined }]);
+
+    expect(client.request).toHaveBeenNthCalledWith(2, "/teams/team-1/members?page=0&per_page=200");
+    expect(client.request).toHaveBeenNthCalledWith(3, "/users/ids", {
+      method: "POST",
+      body: JSON.stringify(["missing-user", "user-2"]),
+    });
+  });
+
+  it("uses user search when a query is present and applies limits", async () => {
+    const client = {
+      token: "token-default",
+      request: vi
+        .fn()
+        .mockResolvedValueOnce([{ id: "team-1" }])
+        .mockResolvedValueOnce([
+          { id: "user-1", username: "alice", first_name: "Alice", last_name: "Ng" },
+          { id: "user-2", username: "alex", nickname: "Lex" },
+        ]),
+    };
+
+    listMattermostAccountIdsMock.mockReturnValue(["default"]);
+    resolveMattermostAccountMock.mockReturnValue({
+      enabled: true,
+      botToken: "token-default",
+      baseUrl: "https://chat.example.com",
+    });
+    createMattermostClientMock.mockReturnValue(client);
+    fetchMattermostMeMock.mockResolvedValue({ id: "me-1" });
+
+    await expect(
+      listMattermostDirectoryPeers({
+        cfg: {} as never,
+        runtime: {} as never,
+        query: "  ali  ",
+        limit: 1,
+      }),
+    ).resolves.toEqual([{ kind: "user", id: "user:user-1", name: "alice", handle: "Alice Ng" }]);
+
+    expect(client.request).toHaveBeenNthCalledWith(2, "/users/search", {
+      method: "POST",
+      body: JSON.stringify({ term: "ali", team_id: "team-1" }),
+    });
+  });
+});

extensions/mattermost/src/mattermost/directory.ts

@@ -0,0 +1,198 @@
+// Mattermost plugin module implements directory behavior.
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { listMattermostAccountIds, resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostMe,
+  type MattermostChannel,
+  type MattermostClient,
+  type MattermostUser,
+} from "./client.js";
+import type { ChannelDirectoryEntry, OpenClawConfig, RuntimeEnv } from "./runtime-api.js";
+
+export type MattermostDirectoryParams = {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+  query?: string | null;
+  limit?: number | null;
+  runtime: RuntimeEnv;
+};
+
+function buildClient(params: {
+  cfg: OpenClawConfig;
+  accountId?: string | null;
+}): MattermostClient | null {
+  const account = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  if (!account.enabled || !account.botToken || !account.baseUrl) {
+    return null;
+  }
+  return createMattermostClient({
+    baseUrl: account.baseUrl,
+    botToken: account.botToken,
+    allowPrivateNetwork: isPrivateNetworkOptInEnabled(account.config),
+  });
+}
+
+/**
+ * Build clients from ALL enabled accounts (deduplicated by token).
+ *
+ * We always scan every account because:
+ * - Private channels are only visible to bots that are members
+ * - The requesting agent's account may have an expired/invalid token
+ *
+ * This means a single healthy bot token is enough for directory discovery.
+ */
+function buildClients(params: MattermostDirectoryParams): MattermostClient[] {
+  const accountIds = listMattermostAccountIds(params.cfg);
+  const seen = new Set<string>();
+  const clients: MattermostClient[] = [];
+  for (const id of accountIds) {
+    const client = buildClient({ cfg: params.cfg, accountId: id });
+    if (client && !seen.has(client.token)) {
+      seen.add(client.token);
+      clients.push(client);
+    }
+  }
+  return clients;
+}
+
+/**
+ * List channels (public + private) visible to any configured bot account.
+ *
+ * NOTE: Uses per_page=200 which covers most instances. Mattermost does not
+ * return a "has more" indicator, so very large instances (200+ channels per bot)
+ * may see incomplete results. Pagination can be added if needed.
+ */
+export async function listMattermostDirectoryGroups(
+  params: MattermostDirectoryParams,
+): Promise<ChannelDirectoryEntry[]> {
+  const clients = buildClients(params);
+  if (!clients.length) {
+    return [];
+  }
+  const q = normalizeLowercaseStringOrEmpty(params.query);
+  const seenIds = new Set<string>();
+  const entries: ChannelDirectoryEntry[] = [];
+
+  for (const client of clients) {
+    try {
+      const me = await fetchMattermostMe(client);
+      const channels = await client.request<MattermostChannel[]>(
+        `/users/${me.id}/channels?per_page=200`,
+      );
+      for (const ch of channels) {
+        if (ch.type !== "O" && ch.type !== "P") {
+          continue;
+        }
+        if (seenIds.has(ch.id)) {
+          continue;
+        }
+        if (q) {
+          const name = normalizeLowercaseStringOrEmpty(ch.name);
+          const display = normalizeLowercaseStringOrEmpty(ch.display_name);
+          if (!name.includes(q) && !display.includes(q)) {
+            continue;
+          }
+        }
+        seenIds.add(ch.id);
+        entries.push({
+          kind: "group" as const,
+          id: `channel:${ch.id}`,
+          name: ch.name ?? undefined,
+          handle: ch.display_name ?? undefined,
+        });
+      }
+    } catch (err) {
+      // Token may be expired/revoked — skip this account and try others
+      console.debug?.(
+        "[mattermost-directory] listGroups: skipping account:",
+        (err as Error)?.message,
+      );
+      continue;
+    }
+  }
+  return params.limit && params.limit > 0 ? entries.slice(0, params.limit) : entries;
+}
+
+/**
+ * List team members as peer directory entries.
+ *
+ * Uses only the first available client since all bots in a team see the same
+ * user list (unlike channels where membership varies). Uses the first team
+ * returned — multi-team setups will only see members from that team.
+ *
+ * Uses paginated member listing with per_page=200, the Mattermost API maximum.
+ */
+export async function listMattermostDirectoryPeers(
+  params: MattermostDirectoryParams,
+): Promise<ChannelDirectoryEntry[]> {
+  const clients = buildClients(params);
+  if (!clients.length) {
+    return [];
+  }
+  // All bots see the same user list, so one client suffices (unlike channels
+  // where private channel membership varies per bot).
+  const client = clients[0];
+  try {
+    const me = await fetchMattermostMe(client);
+    const teams = await client.request<{ id: string }[]>("/users/me/teams");
+    if (!teams.length) {
+      return [];
+    }
+    // Uses first team — multi-team setups may need iteration in the future
+    const teamId = teams[0].id;
+    const q = normalizeLowercaseStringOrEmpty(params.query);
+
+    let users: MattermostUser[];
+    if (q) {
+      users = await client.request<MattermostUser[]>("/users/search", {
+        method: "POST",
+        body: JSON.stringify({ term: q, team_id: teamId }),
+      });
+    } else {
+      const pageSize = 200;
+      const userIds: string[] = [];
+      for (let page = 0; ; page += 1) {
+        const pageMembers = await client.request<ReadonlyArray<{ user_id: string }>>(
+          `/teams/${teamId}/members?page=${page}&per_page=${pageSize}`,
+        );
+        for (const member of pageMembers) {
+          if (member.user_id !== me.id) {
+            userIds.push(member.user_id);
+          }
+        }
+        if (pageMembers.length < pageSize) {
+          break;
+        }
+      }
+      if (!userIds.length) {
+        return [];
+      }
+      users = [];
+      for (let index = 0; index < userIds.length; index += pageSize) {
+        const userIdBatch = userIds.slice(index, index + pageSize);
+        users.push(
+          ...(await client.request<MattermostUser[]>("/users/ids", {
+            method: "POST",
+            body: JSON.stringify(userIdBatch),
+          })),
+        );
+      }
+    }
+
+    const entries = users
+      .filter((u) => u.id !== me.id)
+      .map((u) => ({
+        kind: "user" as const,
+        id: `user:${u.id}`,
+        name: u.username ?? undefined,
+        handle:
+          [u.first_name, u.last_name].filter(Boolean).join(" ").trim() || u.nickname || undefined,
+      }));
+    return params.limit && params.limit > 0 ? entries.slice(0, params.limit) : entries;
+  } catch (err) {
+    console.debug?.("[mattermost-directory] listPeers failed:", (err as Error)?.message);
+    return [];
+  }
+}

extensions/mattermost/src/mattermost/draft-stream.test.ts

@@ -0,0 +1,281 @@
+// Mattermost tests cover draft stream plugin behavior.
+import { describe, expect, it, vi } from "vitest";
+import type { MattermostClient } from "./client.js";
+import { createMattermostDraftStream } from "./draft-stream.js";
+
+type RequestRecord = {
+  path: string;
+  init?: RequestInit;
+};
+
+function createMockClient(): {
+  client: MattermostClient;
+  calls: RequestRecord[];
+  requestMock: ReturnType<typeof vi.fn>;
+} {
+  const calls: RequestRecord[] = [];
+  let nextId = 1;
+  const requestImpl: MattermostClient["request"] = async <T>(
+    path: string,
+    init?: RequestInit,
+  ): Promise<T> => {
+    calls.push({ path, init });
+    if (path === "/posts") {
+      return { id: `post-${nextId++}` } as T;
+    }
+    if (path.startsWith("/posts/")) {
+      return { id: "patched" } as T;
+    }
+    return {} as T;
+  };
+  const requestMock = vi.fn(requestImpl);
+  const client: MattermostClient = {
+    baseUrl: "https://chat.example.com",
+    apiBaseUrl: "https://chat.example.com/api/v4",
+    token: "token",
+    request: requestMock as MattermostClient["request"],
+    fetchImpl: vi.fn() as MattermostClient["fetchImpl"],
+  };
+  return { client, calls, requestMock };
+}
+
+function parseRequestJson(init: RequestInit | undefined): Record<string, unknown> {
+  if (typeof init?.body !== "string") {
+    throw new Error("expected JSON request body");
+  }
+  const parsed: unknown = JSON.parse(init.body);
+  if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
+    throw new Error("expected JSON object request body");
+  }
+  return parsed as Record<string, unknown>;
+}
+
+describe("createMattermostDraftStream", () => {
+  it("creates a preview post and updates it on later changes", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      rootId: "root-1",
+      throttleMs: 0,
+    });
+
+    stream.update("Running `read`…");
+    await stream.flush();
+    stream.update("Running `read`…");
+    await stream.flush();
+
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.path).toBe("/posts");
+
+    expect(parseRequestJson(calls[0]?.init)).toEqual({
+      channel_id: "channel-1",
+      root_id: "root-1",
+      message: "Running `read`…",
+    });
+    expect(stream.postId()).toBe("post-1");
+  });
+
+  it("does not resend identical updates", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      throttleMs: 0,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    stream.update("Working...");
+    await stream.flush();
+
+    expect(calls).toHaveLength(1);
+  });
+
+  it("clears the preview post when no final reply is delivered", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      rootId: "root-1",
+      throttleMs: 0,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    await stream.clear();
+
+    expect(calls).toHaveLength(2);
+    expect(calls[1]?.path).toBe("/posts/post-1");
+    expect(calls[1]?.init?.method).toBe("DELETE");
+    expect(stream.postId()).toBeUndefined();
+  });
+
+  it("discardPending keeps the preview post but ignores later updates", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      rootId: "root-1",
+      throttleMs: 0,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    await stream.discardPending();
+    stream.update("Late update");
+    await stream.flush();
+
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.path).toBe("/posts");
+    expect(stream.postId()).toBe("post-1");
+  });
+
+  it("seal keeps the preview post and cancels pending final overwrites", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      rootId: "root-1",
+      throttleMs: 0,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    stream.update("Stale final draft");
+    await stream.seal();
+
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.path).toBe("/posts");
+    expect(stream.postId()).toBe("post-1");
+  });
+
+  it("stop flushes the last pending update and ignores later ones", async () => {
+    const { client, calls } = createMockClient();
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      rootId: "root-1",
+      throttleMs: 1000,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    stream.update("Stale partial");
+    await stream.stop();
+    stream.update("Late partial");
+    await stream.flush();
+
+    expect(calls).toHaveLength(2);
+    expect(calls[0]?.path).toBe("/posts");
+    expect(calls[1]?.path).toBe("/posts/post-1");
+    expect(parseRequestJson(calls[1]?.init)).toEqual({
+      id: "post-1",
+      message: "Stale partial",
+    });
+  });
+
+  it("warns and stops when preview creation fails", async () => {
+    const warn = vi.fn();
+    const requestImpl: MattermostClient["request"] = async () => {
+      throw new Error("boom");
+    };
+    const requestMock = vi.fn(requestImpl);
+    const client: MattermostClient = {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      token: "token",
+      request: requestMock as MattermostClient["request"],
+      fetchImpl: vi.fn() as MattermostClient["fetchImpl"],
+    };
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      throttleMs: 0,
+      warn,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    stream.update("Still working...");
+    await stream.flush();
+
+    expect(warn).toHaveBeenCalled();
+    expect(requestMock).toHaveBeenCalledTimes(1);
+    expect(stream.postId()).toBeUndefined();
+  });
+
+  it("truncates on a code-point boundary so a straddling emoji is dropped whole", async () => {
+    const { client, calls } = createMockClient();
+    // maxChars=12 => cut point is maxChars-3=9. The emoji 😀 occupies UTF-16
+    // indices 8-9, so a raw slice(0,9) would keep the lone high surrogate at
+    // index 8 and drop its low surrogate at index 9, leaking a dangling half.
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      throttleMs: 0,
+      maxChars: 12,
+    });
+
+    const input = `${"a".repeat(8)}\u{1F600}${"b".repeat(5)}`;
+    stream.update(input);
+    await stream.flush();
+
+    expect(calls).toHaveLength(1);
+    const message = parseRequestJson(calls[0]?.init).message;
+    expect(typeof message).toBe("string");
+    const sent = message as string;
+    // The straddling emoji must be dropped whole, leaving no dangling surrogate half.
+    expect(/[\uD800-\uDFFF]/u.test(sent)).toBe(false);
+    expect(sent.length).toBeLessThanOrEqual(12);
+    expect(sent).toBe("aaaaaaaa...");
+  });
+
+  it("does not resend after an update failure followed by stop", async () => {
+    const warn = vi.fn();
+    const calls: RequestRecord[] = [];
+    let failNextPatch = true;
+    const requestImpl: MattermostClient["request"] = async <T>(
+      path: string,
+      init?: RequestInit,
+    ): Promise<T> => {
+      calls.push({ path, init });
+      if (path === "/posts") {
+        return { id: "post-1" } as T;
+      }
+      if (path === "/posts/post-1") {
+        if (failNextPatch) {
+          failNextPatch = false;
+          throw new Error("patch failed");
+        }
+        return { id: "patched" } as T;
+      }
+      return {} as T;
+    };
+    const requestMock = vi.fn(requestImpl);
+    const client: MattermostClient = {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      token: "token",
+      request: requestMock as MattermostClient["request"],
+      fetchImpl: vi.fn() as MattermostClient["fetchImpl"],
+    };
+    const stream = createMattermostDraftStream({
+      client,
+      channelId: "channel-1",
+      throttleMs: 1000,
+      warn,
+    });
+
+    stream.update("Working...");
+    await stream.flush();
+    stream.update("Will fail");
+    await stream.flush();
+    await stream.stop();
+
+    expect(warn).toHaveBeenCalledWith("mattermost stream preview failed: patch failed");
+    expect(calls).toHaveLength(2);
+    expect(calls[0]?.path).toBe("/posts");
+    expect(calls[1]?.path).toBe("/posts/post-1");
+  });
+});

extensions/mattermost/src/mattermost/draft-stream.ts

@@ -0,0 +1,132 @@
+// Mattermost plugin module implements draft stream behavior.
+import { createFinalizableDraftLifecycle } from "openclaw/plugin-sdk/channel-outbound";
+import { sliceUtf16Safe } from "openclaw/plugin-sdk/text-utility-runtime";
+import {
+  createMattermostPost,
+  deleteMattermostPost,
+  updateMattermostPost,
+  type MattermostClient,
+} from "./client.js";
+
+const MATTERMOST_STREAM_MAX_CHARS = 4000;
+const DEFAULT_THROTTLE_MS = 1000;
+
+type MattermostDraftStream = {
+  update: (text: string) => void;
+  flush: () => Promise<void>;
+  postId: () => string | undefined;
+  clear: () => Promise<void>;
+  discardPending: () => Promise<void>;
+  seal: () => Promise<void>;
+  stop: () => Promise<void>;
+  forceNewMessage: () => void;
+};
+
+function normalizeMattermostDraftText(text: string, maxChars: number): string {
+  const trimmed = text.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed.length <= maxChars) {
+    return trimmed;
+  }
+  return `${sliceUtf16Safe(trimmed, 0, Math.max(0, maxChars - 3)).trimEnd()}...`;
+}
+
+export function createMattermostDraftStream(params: {
+  client: MattermostClient;
+  channelId: string;
+  rootId?: string;
+  maxChars?: number;
+  throttleMs?: number;
+  renderText?: (text: string) => string;
+  log?: (message: string) => void;
+  warn?: (message: string) => void;
+}): MattermostDraftStream {
+  const maxChars = Math.min(
+    params.maxChars ?? MATTERMOST_STREAM_MAX_CHARS,
+    MATTERMOST_STREAM_MAX_CHARS,
+  );
+  const throttleMs = Math.max(250, params.throttleMs ?? DEFAULT_THROTTLE_MS);
+  const streamState = { stopped: false, final: false };
+  let streamPostId: string | undefined;
+  let lastSentText = "";
+
+  const sendOrEditStreamMessage = async (text: string): Promise<boolean> => {
+    if (streamState.stopped && !streamState.final) {
+      return false;
+    }
+    const rendered = params.renderText?.(text) ?? text;
+    const normalized = normalizeMattermostDraftText(rendered, maxChars);
+    if (!normalized) {
+      return false;
+    }
+    if (normalized === lastSentText) {
+      return true;
+    }
+    try {
+      if (streamPostId) {
+        await updateMattermostPost(params.client, streamPostId, {
+          message: normalized,
+        });
+      } else {
+        const sent = await createMattermostPost(params.client, {
+          channelId: params.channelId,
+          message: normalized,
+          rootId: params.rootId,
+        });
+        const postId = sent.id?.trim();
+        if (!postId) {
+          streamState.stopped = true;
+          params.warn?.("mattermost stream preview stopped (missing post id from create)");
+          return false;
+        }
+        streamPostId = postId;
+      }
+      lastSentText = normalized;
+      return true;
+    } catch (err) {
+      streamState.stopped = true;
+      params.warn?.(
+        `mattermost stream preview failed: ${err instanceof Error ? err.message : String(err)}`,
+      );
+      return false;
+    }
+  };
+
+  const { loop, update, stop, clear, discardPending, seal } = createFinalizableDraftLifecycle({
+    throttleMs,
+    state: streamState,
+    sendOrEditStreamMessage,
+    readMessageId: () => streamPostId,
+    clearMessageId: () => {
+      streamPostId = undefined;
+    },
+    isValidMessageId: (value): value is string => typeof value === "string" && value.length > 0,
+    deleteMessage: async (postId) => {
+      await deleteMattermostPost(params.client, postId);
+    },
+    warn: params.warn,
+    warnPrefix: "mattermost stream preview cleanup failed",
+  });
+
+  const forceNewMessage = () => {
+    streamPostId = undefined;
+    lastSentText = "";
+    loop.resetPending();
+    loop.resetThrottleWindow();
+  };
+
+  params.log?.(`mattermost stream preview ready (maxChars=${maxChars}, throttleMs=${throttleMs})`);
+
+  return {
+    update,
+    flush: loop.flush,
+    postId: () => streamPostId,
+    clear,
+    discardPending,
+    seal,
+    stop,
+    forceNewMessage,
+  };
+}

extensions/mattermost/src/mattermost/interactions.test.ts

@@ -0,0 +1,935 @@
+// Mattermost tests cover interactions plugin behavior.
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { describe, expect, it, beforeEach, afterEach, vi } from "vitest";
+import type { PluginRuntime } from "../../runtime-api.js";
+import { setMattermostRuntime } from "../runtime.js";
+import { resolveMattermostAccount } from "./accounts.js";
+import type { MattermostClient, MattermostPost } from "./client.js";
+import {
+  buildButtonAttachments,
+  computeInteractionCallbackUrl,
+  createMattermostInteractionHandler,
+  generateInteractionToken,
+  getInteractionSecret,
+  resolveInteractionCallbackPath,
+  resolveInteractionCallbackUrl,
+  setInteractionCallbackUrl,
+  setInteractionSecret,
+  verifyInteractionToken,
+} from "./interactions.js";
+
+type ButtonAttachments = ReturnType<typeof buildButtonAttachments>;
+type ButtonAttachment = ButtonAttachments[number];
+type ButtonAction = NonNullable<ButtonAttachment["actions"]>[number];
+
+function requireFirstAttachment(attachments: ButtonAttachments): ButtonAttachment {
+  const [attachment] = attachments;
+  if (!attachment) {
+    throw new Error("Expected button attachment fixture");
+  }
+  return attachment;
+}
+
+function requireActions(attachments: ButtonAttachments): ButtonAction[] {
+  const attachment = requireFirstAttachment(attachments);
+  if (!attachment.actions) {
+    throw new Error("Expected button attachment fixture actions");
+  }
+  return attachment.actions;
+}
+
+function requireAction(attachments: ButtonAttachments, index = 0): ButtonAction {
+  const action = requireActions(attachments).at(index);
+  if (!action) {
+    throw new Error(`Expected button attachment action at index ${index}`);
+  }
+  return action;
+}
+
+// ── HMAC token management ────────────────────────────────────────────
+
+describe("setInteractionSecret / getInteractionSecret", () => {
+  beforeEach(() => {
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("derives a deterministic secret from the bot token", () => {
+    setInteractionSecret("token-a");
+    const secretA = getInteractionSecret();
+    setInteractionSecret("token-a");
+    const secretA2 = getInteractionSecret();
+    expect(secretA).toBe(secretA2);
+  });
+
+  it("produces different secrets for different tokens", () => {
+    setInteractionSecret("token-a");
+    const secretA = getInteractionSecret();
+    setInteractionSecret("token-b");
+    const secretB = getInteractionSecret();
+    expect(secretA).not.toBe(secretB);
+  });
+
+  it("returns a hex string", () => {
+    expect(getInteractionSecret()).toMatch(/^[0-9a-f]+$/);
+  });
+});
+
+// ── Token generation / verification ──────────────────────────────────
+
+describe("generateInteractionToken / verifyInteractionToken", () => {
+  beforeEach(() => {
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("generates a hex token", () => {
+    const token = generateInteractionToken({ action_id: "click" });
+    expect(token).toMatch(/^[0-9a-f]{64}$/);
+  });
+
+  it("verifies a valid token", () => {
+    const context = { action_id: "do_now", item_id: "123" };
+    const token = generateInteractionToken(context);
+    expect(verifyInteractionToken(context, token)).toBe(true);
+  });
+
+  it("rejects a tampered token", () => {
+    const context = { action_id: "do_now" };
+    const token = generateInteractionToken(context);
+    const tampered = token.replace(/.$/, token.endsWith("0") ? "1" : "0");
+    expect(verifyInteractionToken(context, tampered)).toBe(false);
+  });
+
+  it("rejects a token generated with different context", () => {
+    const token = generateInteractionToken({ action_id: "a" });
+    expect(verifyInteractionToken({ action_id: "b" }, token)).toBe(false);
+  });
+
+  it("rejects tokens with wrong length", () => {
+    const context = { action_id: "test" };
+    expect(verifyInteractionToken(context, "short")).toBe(false);
+  });
+
+  it("is deterministic for the same context", () => {
+    const context = { action_id: "test", x: 1 };
+    const t1 = generateInteractionToken(context);
+    const t2 = generateInteractionToken(context);
+    expect(t1).toBe(t2);
+  });
+
+  it("produces the same token regardless of key order", () => {
+    const contextA = { action_id: "do_now", tweet_id: "123", action: "do" };
+    const contextB = { action: "do", action_id: "do_now", tweet_id: "123" };
+    const contextC = { tweet_id: "123", action: "do", action_id: "do_now" };
+    const tokenA = generateInteractionToken(contextA);
+    const tokenB = generateInteractionToken(contextB);
+    const tokenC = generateInteractionToken(contextC);
+    expect(tokenA).toBe(tokenB);
+    expect(tokenB).toBe(tokenC);
+  });
+
+  it("verifies a token when Mattermost reorders context keys", () => {
+    // Simulate: token generated with keys in one order, verified with keys in another
+    // (Mattermost reorders context keys when storing/returning interactive message payloads)
+    const originalContext = { action_id: "bm_do", tweet_id: "999", action: "do" };
+    const token = generateInteractionToken(originalContext);
+
+    // Mattermost returns keys in alphabetical order (or any arbitrary order)
+    const reorderedContext = { action: "do", action_id: "bm_do", tweet_id: "999" };
+    expect(verifyInteractionToken(reorderedContext, token)).toBe(true);
+  });
+
+  it("verifies nested context regardless of nested key order", () => {
+    const originalContext = {
+      action_id: "nested",
+      payload: {
+        model: "gpt-5",
+        meta: {
+          provider: "openai",
+          page: 2,
+        },
+      },
+    };
+    const token = generateInteractionToken(originalContext);
+
+    const reorderedContext = {
+      payload: {
+        meta: {
+          page: 2,
+          provider: "openai",
+        },
+        model: "gpt-5",
+      },
+      action_id: "nested",
+    };
+
+    expect(verifyInteractionToken(reorderedContext, token)).toBe(true);
+  });
+
+  it("rejects nested context tampering", () => {
+    const originalContext = {
+      action_id: "nested",
+      payload: {
+        provider: "openai",
+        model: "gpt-5",
+      },
+    };
+    const token = generateInteractionToken(originalContext);
+    const tamperedContext = {
+      action_id: "nested",
+      payload: {
+        provider: "anthropic",
+        model: "gpt-5",
+      },
+    };
+
+    expect(verifyInteractionToken(tamperedContext, token)).toBe(false);
+  });
+
+  it("scopes tokens per account when account secrets differ", () => {
+    setInteractionSecret("acct-a", "bot-token-a");
+    setInteractionSecret("acct-b", "bot-token-b");
+    const context = { action_id: "do_now", item_id: "123" };
+    const tokenA = generateInteractionToken(context, "acct-a");
+
+    expect(verifyInteractionToken(context, tokenA, "acct-a")).toBe(true);
+    expect(verifyInteractionToken(context, tokenA, "acct-b")).toBe(false);
+  });
+});
+
+describe("resolveInteractionCallbackUrl", () => {
+  afterEach(() => {
+    for (const accountId of ["cached", "default", "acct", "myaccount"]) {
+      setInteractionCallbackUrl(accountId, "");
+    }
+  });
+
+  it("prefers cached URL from registry", () => {
+    setInteractionCallbackUrl("cached", "http://cached:1234/path");
+    expect(resolveInteractionCallbackUrl("cached")).toBe("http://cached:1234/path");
+  });
+
+  it("recomputes from config when bypassing the cache explicitly", () => {
+    setInteractionCallbackUrl("acct", "http://cached:1234/path");
+    const url = computeInteractionCallbackUrl("acct", {
+      gateway: { port: 9999, customBindHost: "gateway.internal" },
+    });
+    expect(url).toBe("http://gateway.internal:9999/mattermost/interactions/acct");
+  });
+
+  it("uses interactions.callbackBaseUrl when configured", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      channels: {
+        mattermost: {
+          interactions: {
+            callbackBaseUrl: "https://gateway.example.com/openclaw",
+          },
+        },
+      },
+    });
+    expect(url).toBe("https://gateway.example.com/openclaw/mattermost/interactions/default");
+  });
+
+  it("trims trailing slashes from callbackBaseUrl", () => {
+    const url = resolveInteractionCallbackUrl("acct", {
+      channels: {
+        mattermost: {
+          interactions: {
+            callbackBaseUrl: "https://gateway.example.com/root///",
+          },
+        },
+      },
+    });
+    expect(url).toBe("https://gateway.example.com/root/mattermost/interactions/acct");
+  });
+
+  it("uses merged per-account interactions.callbackBaseUrl", () => {
+    const cfg = {
+      gateway: { port: 9999 },
+      channels: {
+        mattermost: {
+          accounts: {
+            acct: {
+              botToken: "bot-token",
+              baseUrl: "https://chat.example.com",
+              interactions: {
+                callbackBaseUrl: "https://gateway.example.com/root",
+              },
+            },
+          },
+        },
+      },
+    };
+    const account = resolveMattermostAccount({
+      cfg,
+      accountId: "acct",
+      allowUnresolvedSecretRef: true,
+    });
+    const url = resolveInteractionCallbackUrl(account.accountId, {
+      gateway: cfg.gateway,
+      interactions: account.config.interactions,
+    });
+    expect(url).toBe("https://gateway.example.com/root/mattermost/interactions/acct");
+  });
+
+  it("falls back to gateway.customBindHost when configured", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      gateway: { port: 9999, customBindHost: "gateway.internal" },
+    });
+    expect(url).toBe("http://gateway.internal:9999/mattermost/interactions/default");
+  });
+
+  it("falls back to localhost when customBindHost is a wildcard bind address", () => {
+    const url = resolveInteractionCallbackUrl("default", {
+      gateway: { port: 9999, customBindHost: "0.0.0.0" },
+    });
+    expect(url).toBe("http://localhost:9999/mattermost/interactions/default");
+  });
+
+  it("brackets IPv6 custom bind hosts", () => {
+    const url = resolveInteractionCallbackUrl("acct", {
+      gateway: { port: 9999, customBindHost: "::1" },
+    });
+    expect(url).toBe("http://[::1]:9999/mattermost/interactions/acct");
+  });
+
+  it("uses default port 18789 when no config provided", () => {
+    const url = resolveInteractionCallbackUrl("myaccount");
+    expect(url).toBe("http://localhost:18789/mattermost/interactions/myaccount");
+  });
+});
+
+describe("resolveInteractionCallbackPath", () => {
+  it("builds the per-account callback path", () => {
+    expect(resolveInteractionCallbackPath("acct")).toBe("/mattermost/interactions/acct");
+  });
+});
+
+// ── buildButtonAttachments ───────────────────────────────────────────
+
+describe("buildButtonAttachments", () => {
+  beforeEach(() => {
+    setInteractionSecret("test-bot-token");
+  });
+
+  it("returns an array with one attachment containing all buttons", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/mattermost/interactions/default",
+      buttons: [
+        { id: "btn1", name: "Click Me" },
+        { id: "btn2", name: "Skip", style: "danger" },
+      ],
+    });
+
+    expect(result).toHaveLength(1);
+    expect(requireActions(result)).toHaveLength(2);
+  });
+
+  it("sets type to 'button' on every action", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "a", name: "A" }],
+    });
+
+    expect(requireAction(result).type).toBe("button");
+  });
+
+  it("includes HMAC _token in integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "test", name: "Test" }],
+    });
+
+    const action = requireAction(result);
+    expect(action.integration.context["_token"]).toMatch(/^[0-9a-f]{64}$/);
+  });
+
+  it("includes sanitized action_id in integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "my_action", name: "Do It" }],
+    });
+
+    const action = requireAction(result);
+    // sanitizeActionId strips hyphens and underscores (Mattermost routing bug #25747)
+    expect(action.integration.context.action_id).toBe("myaction");
+    expect(action.id).toBe("myaction");
+  });
+
+  it("merges custom context into integration context", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost:18789/cb",
+      buttons: [{ id: "btn", name: "Go", context: { tweet_id: "123", batch: true } }],
+    });
+
+    const ctx = requireAction(result).integration.context;
+    expect(ctx.tweet_id).toBe("123");
+    expect(ctx.batch).toBe(true);
+    expect(ctx.action_id).toBe("btn");
+    expect(ctx["_token"]).toMatch(/^[0-9a-f]{64}$/);
+  });
+
+  it("passes callback URL to each button integration", () => {
+    const url = "http://localhost:18789/mattermost/interactions/default";
+    const result = buildButtonAttachments({
+      callbackUrl: url,
+      buttons: [
+        { id: "a", name: "A" },
+        { id: "b", name: "B" },
+      ],
+    });
+
+    for (const action of requireActions(result)) {
+      expect(action.integration.url).toBe(url);
+    }
+  });
+
+  it("preserves button style", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [
+        { id: "ok", name: "OK", style: "primary" },
+        { id: "no", name: "No", style: "danger" },
+      ],
+    });
+
+    expect(requireAction(result, 0).style).toBe("primary");
+    expect(requireAction(result, 1).style).toBe("danger");
+  });
+
+  it("uses provided text for the attachment", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "x", name: "X" }],
+      text: "Choose an action:",
+    });
+
+    expect(requireFirstAttachment(result).text).toBe("Choose an action:");
+  });
+
+  it("defaults to empty string text when not provided", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "x", name: "X" }],
+    });
+
+    expect(requireFirstAttachment(result).text).toBe("");
+  });
+
+  it("generates verifiable tokens", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "verify_me", name: "V", context: { extra: "data" } }],
+    });
+
+    const ctx = requireAction(result).integration.context;
+    const token = ctx["_token"] as string;
+    const { _token, ...contextWithoutToken } = ctx;
+    expect(verifyInteractionToken(contextWithoutToken, token)).toBe(true);
+  });
+
+  it("generates tokens that verify even when Mattermost reorders context keys", () => {
+    const result = buildButtonAttachments({
+      callbackUrl: "http://localhost/cb",
+      buttons: [{ id: "do_action", name: "Do", context: { tweet_id: "42", category: "ai" } }],
+    });
+
+    const ctx = requireAction(result).integration.context;
+    const token = ctx["_token"] as string;
+
+    // Simulate Mattermost returning context with keys in a different order
+    const reordered: Record<string, unknown> = {};
+    const keys = Object.keys(ctx).filter((k) => k !== "_token");
+    // Reverse the key order to simulate reordering
+    for (const key of keys.toReversed()) {
+      reordered[key] = ctx[key];
+    }
+    expect(verifyInteractionToken(reordered, token)).toBe(true);
+  });
+});
+
+describe("createMattermostInteractionHandler", () => {
+  function setInteractionRuntime(
+    enqueueSystemEvent: (
+      text: string,
+      options: { sessionKey?: string | null; sessionId?: string | null; userId?: string | null },
+    ) => boolean = () => true,
+  ) {
+    setMattermostRuntime({
+      system: {
+        enqueueSystemEvent,
+      },
+    } as unknown as PluginRuntime);
+  }
+
+  function createMattermostClientMock(
+    requestImpl: (path: string, init?: { method?: string }) => Promise<unknown>,
+  ): MattermostClient {
+    return {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      token: "bot-token",
+      request: async <T>(path: string, init?: RequestInit) => (await requestImpl(path, init)) as T,
+      fetchImpl: vi.fn<typeof fetch>(),
+    };
+  }
+
+  beforeEach(() => {
+    setInteractionRuntime();
+    setInteractionSecret("acct", "bot-token");
+  });
+
+  function createReq(params: {
+    method?: string;
+    body?: unknown;
+    remoteAddress?: string;
+    headers?: Record<string, string>;
+  }): IncomingMessage {
+    const body =
+      params.body === undefined
+        ? ""
+        : typeof params.body === "string"
+          ? params.body
+          : JSON.stringify(params.body);
+    const listeners = new Map<string, Array<(...args: unknown[]) => void>>();
+
+    const req = {
+      destroyed: false,
+      method: params.method ?? "POST",
+      headers: params.headers ?? {},
+      socket: { remoteAddress: params.remoteAddress ?? "203.0.113.10" },
+      on(event: string, handler: (...args: unknown[]) => void) {
+        const existing = listeners.get(event) ?? [];
+        existing.push(handler);
+        listeners.set(event, existing);
+        return this;
+      },
+      removeListener(event: string, handler: (...args: unknown[]) => void) {
+        const existing = listeners.get(event) ?? [];
+        listeners.set(
+          event,
+          existing.filter((entry) => entry !== handler),
+        );
+        return this;
+      },
+      destroy() {
+        this.destroyed = true;
+        return this;
+      },
+    } as IncomingMessage & { emitTest: (event: string, ...args: unknown[]) => void };
+
+    req.emitTest = (event: string, ...args: unknown[]) => {
+      const handlers = listeners.get(event) ?? [];
+      for (const handler of handlers) {
+        handler(...args);
+      }
+    };
+
+    queueMicrotask(() => {
+      if (body) {
+        req.emitTest("data", Buffer.from(body));
+      }
+      req.emitTest("end");
+    });
+
+    return req;
+  }
+
+  function createRes(): ServerResponse & { headers: Record<string, string>; body: string } {
+    const res = {
+      statusCode: 200,
+      headers: {},
+      body: "",
+      setHeader(name: string, value: string | number | readonly string[]) {
+        res.headers[name] = Array.isArray(value) ? value.join(",") : String(value);
+        return res;
+      },
+      end(
+        chunk?: string | Buffer | Uint8Array,
+        _encoding?: BufferEncoding | (() => void),
+        cb?: () => void,
+      ) {
+        res.body = chunk ? String(chunk) : "";
+        cb?.();
+        return res;
+      },
+    } as ServerResponse & { headers: Record<string, string>; body: string };
+    return res;
+  }
+
+  function createActionContext(actionId = "approve", channelId = "chan-1") {
+    const context = { action_id: actionId, __openclaw_channel_id: channelId };
+    return { context, token: generateInteractionToken(context, "acct") };
+  }
+
+  function createInteractionBody(params: {
+    context: Record<string, unknown>;
+    token: string;
+    channelId?: string;
+    postId?: string;
+    userId?: string;
+    userName?: string;
+  }) {
+    return {
+      user_id: params.userId ?? "user-1",
+      ...(params.userName ? { user_name: params.userName } : {}),
+      channel_id: params.channelId ?? "chan-1",
+      post_id: params.postId ?? "post-1",
+      context: { ...params.context, _token: params.token },
+    };
+  }
+
+  async function runHandler(
+    handler: ReturnType<typeof createMattermostInteractionHandler>,
+    params: {
+      body: unknown;
+      remoteAddress?: string;
+      headers?: Record<string, string>;
+    },
+  ) {
+    const req = createReq({
+      remoteAddress: params.remoteAddress,
+      headers: params.headers,
+      body: params.body,
+    });
+    const res = createRes();
+    await handler(req, res);
+    return res;
+  }
+
+  function expectForbiddenResponse(
+    res: ServerResponse & { body: string },
+    expectedMessage: string,
+  ) {
+    expect(res.statusCode).toBe(403);
+    expect(res.body).toContain(expectedMessage);
+  }
+
+  function expectSuccessfulApprovalUpdate(
+    res: ServerResponse & { body: string },
+    requestLog?: Array<{ path: string; method?: string }>,
+  ) {
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe("{}");
+    if (requestLog) {
+      expect(requestLog).toEqual([
+        { path: "/posts/post-1", method: undefined },
+        { path: "/posts/post-1", method: "PUT" },
+      ]);
+    }
+  }
+
+  function createActionPost(params?: {
+    actionId?: string;
+    actionName?: string;
+    channelId?: string;
+    rootId?: string;
+  }): MattermostPost {
+    return {
+      id: "post-1",
+      channel_id: params?.channelId ?? "chan-1",
+      ...(params?.rootId ? { root_id: params.rootId } : {}),
+      message: "Choose",
+      props: {
+        attachments: [
+          {
+            actions: [
+              {
+                id: params?.actionId ?? "approve",
+                name: params?.actionName ?? "Approve",
+              },
+            ],
+          },
+        ],
+      },
+    };
+  }
+
+  function createUnusedInteractionHandler() {
+    return createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => ({ message: "unused" })),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+  }
+
+  async function runApproveInteraction(params?: {
+    actionName?: string;
+    allowedSourceIps?: string[];
+    trustedProxies?: string[];
+    remoteAddress?: string;
+    headers?: Record<string, string>;
+  }) {
+    const { context, token } = createActionContext();
+    const requestLog: Array<{ path: string; method?: string }> = [];
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (path: string, init?: { method?: string }) => {
+        requestLog.push({ path, method: init?.method });
+        if (init?.method === "PUT") {
+          return { id: "post-1" };
+        }
+        return createActionPost({ actionName: params?.actionName });
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      allowedSourceIps: params?.allowedSourceIps,
+      trustedProxies: params?.trustedProxies,
+    });
+
+    const res = await runHandler(handler, {
+      remoteAddress: params?.remoteAddress,
+      headers: params?.headers,
+      body: createInteractionBody({ context, token, userName: "alice" }),
+    });
+    return { res, requestLog };
+  }
+
+  async function runInvalidActionRequest(actionId: string) {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () =>
+        createActionPost({ actionId, actionName: actionId }),
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+
+    return await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+  }
+
+  it("accepts callback requests from an allowlisted source IP", async () => {
+    const { res, requestLog } = await runApproveInteraction({
+      allowedSourceIps: ["198.51.100.8"],
+      remoteAddress: "198.51.100.8",
+    });
+
+    expectSuccessfulApprovalUpdate(res, requestLog);
+  });
+
+  it("rejects malformed JSON callback requests with a stable parser error", async () => {
+    const log = vi.fn();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => {
+        throw new Error("unexpected client request");
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      log,
+    });
+
+    const res = await runHandler(handler, { body: "{not json" });
+
+    expect(res.statusCode).toBe(400);
+    expect(res.body).toBe(JSON.stringify({ error: "Invalid request body" }));
+    expect(log).toHaveBeenCalledWith(
+      "mattermost interaction: failed to parse body: Error: Mattermost interaction body was malformed JSON",
+    );
+  });
+
+  it("accepts forwarded Mattermost source IPs from a trusted proxy", async () => {
+    const { res } = await runApproveInteraction({
+      allowedSourceIps: ["198.51.100.8"],
+      trustedProxies: ["127.0.0.1"],
+      remoteAddress: "127.0.0.1",
+      headers: { "x-forwarded-for": "198.51.100.8" },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe("{}");
+  });
+
+  it("rejects callback requests from non-allowlisted source IPs", async () => {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => {
+        throw new Error("should not fetch post for rejected origins");
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      allowedSourceIps: ["127.0.0.1"],
+    });
+
+    const res = await runHandler(handler, {
+      remoteAddress: "198.51.100.8",
+      body: createInteractionBody({ context, token }),
+    });
+    expectForbiddenResponse(res, "Forbidden origin");
+  });
+
+  it("rejects requests with an invalid interaction token", async () => {
+    const handler = createUnusedInteractionHandler();
+
+    const res = await runHandler(handler, {
+      body: {
+        user_id: "user-1",
+        channel_id: "chan-1",
+        post_id: "post-1",
+        context: { action_id: "approve", _token: "deadbeef" },
+      },
+    });
+    expectForbiddenResponse(res, "Invalid token");
+  });
+
+  it("rejects requests when the signed channel does not match the callback payload", async () => {
+    const { context, token } = createActionContext();
+    const handler = createUnusedInteractionHandler();
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token, channelId: "chan-2" }),
+    });
+    expectForbiddenResponse(res, "Channel mismatch");
+  });
+
+  it("rejects requests when the fetched post does not belong to the callback channel", async () => {
+    const { context, token } = createActionContext();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async () => createActionPost({ channelId: "chan-9" })),
+      botUserId: "bot",
+      accountId: "acct",
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+    expectForbiddenResponse(res, "Post/channel mismatch");
+  });
+
+  it("rejects requests when the action is not present on the fetched post", async () => {
+    const res = await runInvalidActionRequest("reject");
+
+    expect(res.statusCode).toBe(403);
+    expect(res.body).toContain("Unknown action");
+  });
+
+  it("accepts actions when the button name matches the action id", async () => {
+    const { res, requestLog } = await runApproveInteraction({
+      actionName: "approve",
+    });
+
+    expectSuccessfulApprovalUpdate(res, requestLog);
+  });
+
+  it("blocks button dispatch when the sender is not allowed for the action", async () => {
+    const { context, token } = createActionContext();
+    const dispatchButtonClick = vi.fn();
+    const handleInteraction = vi.fn();
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (_path: string, init?: { method?: string }) =>
+        init?.method === "PUT" ? { id: "post-1" } : createActionPost(),
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+      authorizeButtonClick: async () => ({
+        ok: false,
+        response: {
+          ephemeral_text: "blocked",
+        },
+      }),
+      handleInteraction,
+      dispatchButtonClick,
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token }),
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toContain("blocked");
+    expect(handleInteraction).not.toHaveBeenCalled();
+    expect(dispatchButtonClick).not.toHaveBeenCalled();
+  });
+
+  it("forwards fetched post threading metadata to session and button callbacks", async () => {
+    const enqueueSystemEvent = vi.fn();
+    setInteractionRuntime(enqueueSystemEvent);
+    const { context, token } = createActionContext();
+    const resolveSessionKey = vi.fn().mockResolvedValue("session:thread:root-9");
+    const dispatchButtonClick = vi.fn();
+    const fetchedPost = createActionPost({ rootId: "root-9" });
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (_path: string, init?: { method?: string }) =>
+        init?.method === "PUT" ? { id: "post-1" } : fetchedPost,
+      ),
+      botUserId: "bot",
+      accountId: "acct",
+      resolveSessionKey,
+      dispatchButtonClick,
+    });
+
+    const res = await runHandler(handler, {
+      body: createInteractionBody({ context, token, userName: "alice" }),
+    });
+    expect(res.statusCode).toBe(200);
+    expect(resolveSessionKey).toHaveBeenCalledWith({
+      channelId: "chan-1",
+      userId: "user-1",
+      post: fetchedPost,
+    });
+    expect(enqueueSystemEvent).toHaveBeenCalledWith(
+      'Mattermost button click: action="approve" by alice in channel chan-1',
+      {
+        sessionKey: "session:thread:root-9",
+        contextKey: "mattermost:interaction:post-1:approve",
+      },
+    );
+    expect(dispatchButtonClick).toHaveBeenCalledWith({
+      channelId: "chan-1",
+      userId: "user-1",
+      userName: "alice",
+      actionId: "approve",
+      actionName: "Approve",
+      postId: "post-1",
+      post: fetchedPost,
+    });
+  });
+
+  it("lets a custom interaction handler short-circuit generic completion updates", async () => {
+    const { context, token } = createActionContext("mdlprov");
+    const requestLog: Array<{ path: string; method?: string }> = [];
+    const handleInteraction = vi.fn().mockResolvedValue({
+      ephemeral_text: "Only the original requester can use this picker.",
+    });
+    const dispatchButtonClick = vi.fn();
+    const originalPost = createActionPost({
+      actionId: "mdlprov",
+      actionName: "Browse providers",
+    });
+    const handler = createMattermostInteractionHandler({
+      client: createMattermostClientMock(async (path: string, init?: { method?: string }) => {
+        requestLog.push({ path, method: init?.method });
+        return originalPost;
+      }),
+      botUserId: "bot",
+      accountId: "acct",
+      handleInteraction,
+      dispatchButtonClick,
+    });
+    const body = createInteractionBody({
+      context,
+      token,
+      userId: "user-2",
+      userName: "alice",
+    });
+
+    const res = await runHandler(handler, { body });
+
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toBe(
+      JSON.stringify({
+        ephemeral_text: "Only the original requester can use this picker.",
+      }),
+    );
+    expect(requestLog).toEqual([{ path: "/posts/post-1", method: undefined }]);
+    expect(handleInteraction).toHaveBeenCalledWith({
+      payload: body,
+      userName: "alice",
+      actionId: "mdlprov",
+      actionName: "Browse providers",
+      originalMessage: "Choose",
+      context,
+      post: originalPost,
+    });
+    expect(dispatchButtonClick).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/interactions.ts

@@ -0,0 +1,677 @@
+// Mattermost plugin module implements interactions behavior.
+import { createHmac } from "node:crypto";
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { safeEqualSecret } from "openclaw/plugin-sdk/security-runtime";
+import {
+  normalizeOptionalString,
+  normalizeStringifiedOptionalString,
+} from "openclaw/plugin-sdk/string-coerce-runtime";
+import { getMattermostRuntime } from "../runtime.js";
+import { updateMattermostPost, type MattermostClient, type MattermostPost } from "./client.js";
+import {
+  isTrustedProxyAddress,
+  readRequestBodyWithLimit,
+  resolveClientIp,
+  type OpenClawConfig,
+} from "./runtime-api.js";
+
+const INTERACTION_MAX_BODY_BYTES = 64 * 1024;
+const INTERACTION_BODY_TIMEOUT_MS = 10_000;
+const SIGNED_CHANNEL_ID_CONTEXT_KEY = "__openclaw_channel_id";
+
+/**
+ * Mattermost interactive message callback payload.
+ * Sent by Mattermost when a user clicks an action button.
+ * See: https://developers.mattermost.com/integrate/plugins/interactive-messages/
+ */
+type MattermostInteractionPayload = {
+  user_id: string;
+  user_name?: string;
+  channel_id: string;
+  team_id?: string;
+  post_id: string;
+  trigger_id?: string;
+  type?: string;
+  data_source?: string;
+  context?: Record<string, unknown>;
+};
+
+export type MattermostInteractionResponse = {
+  update?: {
+    message: string;
+    props?: Record<string, unknown>;
+  };
+  ephemeral_text?: string;
+};
+
+type MattermostInteractionAuthorizationResult =
+  | { ok: true }
+  | { ok: false; statusCode?: number; response?: MattermostInteractionResponse };
+
+export type MattermostInteractiveButtonInput = {
+  id?: string;
+  callback_data?: string;
+  text?: string;
+  name?: string;
+  label?: string;
+  style?: "default" | "primary" | "danger";
+  context?: Record<string, unknown>;
+};
+
+// ── Callback URL registry ──────────────────────────────────────────────
+
+const callbackUrls = new Map<string, string>();
+
+export function setInteractionCallbackUrl(accountId: string, url: string): void {
+  callbackUrls.set(accountId, url);
+}
+
+type InteractionCallbackConfig = Pick<OpenClawConfig, "gateway" | "channels"> & {
+  interactions?: {
+    callbackBaseUrl?: string;
+  };
+};
+
+export function resolveInteractionCallbackPath(accountId: string): string {
+  return `/mattermost/interactions/${accountId}`;
+}
+
+function isWildcardBindHost(rawHost: string): boolean {
+  const trimmed = rawHost.trim();
+  if (!trimmed) {
+    return false;
+  }
+  const host = trimmed.startsWith("[") && trimmed.endsWith("]") ? trimmed.slice(1, -1) : trimmed;
+  return host === "0.0.0.0" || host === "::" || host === "0:0:0:0:0:0:0:0" || host === "::0";
+}
+
+function normalizeCallbackBaseUrl(baseUrl: string): string {
+  return baseUrl.trim().replace(/\/+$/, "");
+}
+
+function headerValue(value: string | string[] | undefined): string | undefined {
+  if (Array.isArray(value)) {
+    return normalizeOptionalString(value[0]);
+  }
+  return normalizeOptionalString(value);
+}
+
+function isAllowedInteractionSource(params: {
+  req: IncomingMessage;
+  allowedSourceIps?: string[];
+  trustedProxies?: string[];
+  allowRealIpFallback?: boolean;
+}): boolean {
+  const { allowedSourceIps } = params;
+  if (!allowedSourceIps?.length) {
+    return true;
+  }
+
+  const clientIp = resolveClientIp({
+    remoteAddr: params.req.socket?.remoteAddress,
+    forwardedFor: headerValue(params.req.headers["x-forwarded-for"]),
+    realIp: headerValue(params.req.headers["x-real-ip"]),
+    trustedProxies: params.trustedProxies,
+    allowRealIpFallback: params.allowRealIpFallback,
+  });
+  return isTrustedProxyAddress(clientIp, allowedSourceIps);
+}
+
+/**
+ * Resolve the interaction callback URL for an account.
+ * Falls back to computing it from interactions.callbackBaseUrl or gateway host config.
+ */
+export function computeInteractionCallbackUrl(
+  accountId: string,
+  cfg?: InteractionCallbackConfig,
+): string {
+  const path = resolveInteractionCallbackPath(accountId);
+  // Prefer merged per-account config when available, but keep the top-level path for
+  // callers/tests that still pass the root Mattermost config shape directly.
+  const callbackBaseUrl =
+    normalizeOptionalString(cfg?.interactions?.callbackBaseUrl) ??
+    normalizeOptionalString(cfg?.channels?.mattermost?.interactions?.callbackBaseUrl);
+  if (callbackBaseUrl) {
+    return `${normalizeCallbackBaseUrl(callbackBaseUrl)}${path}`;
+  }
+  const port = typeof cfg?.gateway?.port === "number" ? cfg.gateway.port : 18789;
+  let host =
+    cfg?.gateway?.customBindHost && !isWildcardBindHost(cfg.gateway.customBindHost)
+      ? cfg.gateway.customBindHost.trim()
+      : "localhost";
+
+  // Bracket IPv6 literals so the URL is valid: http://[::1]:18789/...
+  if (host.includes(":") && !(host.startsWith("[") && host.endsWith("]"))) {
+    host = `[${host}]`;
+  }
+
+  return `http://${host}:${port}${path}`;
+}
+
+/**
+ * Resolve the interaction callback URL for an account.
+ * Prefers the in-memory registered URL (set by the gateway monitor) so callers outside the
+ * monitor lifecycle can reuse the runtime-validated callback destination.
+ */
+export function resolveInteractionCallbackUrl(
+  accountId: string,
+  cfg?: InteractionCallbackConfig,
+): string {
+  const cached = callbackUrls.get(accountId);
+  if (cached) {
+    return cached;
+  }
+  return computeInteractionCallbackUrl(accountId, cfg);
+}
+
+// ── HMAC token management ──────────────────────────────────────────────
+// Secret is derived from the bot token so it's stable across CLI and gateway processes.
+
+const interactionSecrets = new Map<string, string>();
+let defaultInteractionSecret: string | undefined;
+
+function deriveInteractionSecret(botToken: string): string {
+  return createHmac("sha256", "openclaw-mattermost-interactions").update(botToken).digest("hex");
+}
+
+export function setInteractionSecret(accountIdOrBotToken: string, botToken?: string): void {
+  if (typeof botToken === "string") {
+    interactionSecrets.set(accountIdOrBotToken, deriveInteractionSecret(botToken));
+    return;
+  }
+  // Backward-compatible fallback for call sites/tests that only pass botToken.
+  defaultInteractionSecret = deriveInteractionSecret(accountIdOrBotToken);
+}
+
+export function getInteractionSecret(accountId?: string): string {
+  const scoped = accountId ? interactionSecrets.get(accountId) : undefined;
+  if (scoped) {
+    return scoped;
+  }
+  if (defaultInteractionSecret) {
+    return defaultInteractionSecret;
+  }
+  // Fallback for single-account runtimes that only registered scoped secrets.
+  if (interactionSecrets.size === 1) {
+    const first = interactionSecrets.values().next().value;
+    if (typeof first === "string") {
+      return first;
+    }
+  }
+  throw new Error(
+    "Interaction secret not initialized — call setInteractionSecret(accountId, botToken) first",
+  );
+}
+
+function canonicalizeInteractionContext(value: unknown): unknown {
+  if (Array.isArray(value)) {
+    return value.map((item) => canonicalizeInteractionContext(item));
+  }
+  if (value && typeof value === "object") {
+    const entries = Object.entries(value as Record<string, unknown>)
+      .filter(([, entryValue]) => entryValue !== undefined)
+      .toSorted(([left], [right]) => left.localeCompare(right))
+      .map(([key, entryValue]) => [key, canonicalizeInteractionContext(entryValue)]);
+    return Object.fromEntries(entries);
+  }
+  return value;
+}
+
+export function generateInteractionToken(
+  context: Record<string, unknown>,
+  accountId?: string,
+): string {
+  const secret = getInteractionSecret(accountId);
+  const payload = JSON.stringify(canonicalizeInteractionContext(context));
+  return createHmac("sha256", secret).update(payload).digest("hex");
+}
+
+export function verifyInteractionToken(
+  context: Record<string, unknown>,
+  token: string,
+  accountId?: string,
+): boolean {
+  const expected = generateInteractionToken(context, accountId);
+  return safeEqualSecret(expected, token);
+}
+
+// ── Button builder helpers ─────────────────────────────────────────────
+
+type MattermostButton = {
+  id: string;
+  type: "button" | "select";
+  name: string;
+  style?: "default" | "primary" | "danger";
+  integration: {
+    url: string;
+    context: Record<string, unknown>;
+  };
+};
+
+type MattermostAttachment = {
+  text?: string;
+  actions?: MattermostButton[];
+  [key: string]: unknown;
+};
+
+/**
+ * Build Mattermost `props.attachments` with interactive buttons.
+ *
+ * Each button includes an HMAC token in its integration context so the
+ * callback handler can verify the request originated from a legitimate
+ * button click (Mattermost's recommended security pattern).
+ */
+/**
+ * Sanitize a button ID so Mattermost's action router can match it.
+ * Mattermost uses the action ID in the URL path `/api/v4/posts/{id}/actions/{actionId}`
+ * and IDs containing hyphens or underscores break the server-side routing.
+ * See: https://github.com/mattermost/mattermost/issues/25747
+ */
+function sanitizeActionId(id: string): string {
+  return id.replace(/[-_]/g, "");
+}
+
+export function buildButtonAttachments(params: {
+  callbackUrl: string;
+  accountId?: string;
+  buttons: Array<{
+    id: string;
+    name: string;
+    style?: "default" | "primary" | "danger";
+    context?: Record<string, unknown>;
+  }>;
+  text?: string;
+}): MattermostAttachment[] {
+  const actions: MattermostButton[] = params.buttons.map((btn) => {
+    const safeId = sanitizeActionId(btn.id);
+    const context: Record<string, unknown> = {
+      action_id: safeId,
+      ...btn.context,
+    };
+    const token = generateInteractionToken(context, params.accountId);
+    return {
+      id: safeId,
+      type: "button" as const,
+      name: btn.name,
+      style: btn.style,
+      integration: {
+        url: params.callbackUrl,
+        context: {
+          ...context,
+          _token: token,
+        },
+      },
+    };
+  });
+
+  return [
+    {
+      text: params.text ?? "",
+      actions,
+    },
+  ];
+}
+
+export function buildButtonProps(params: {
+  callbackUrl: string;
+  accountId?: string;
+  channelId: string;
+  buttons: Array<unknown>;
+  text?: string;
+}): Record<string, unknown> | undefined {
+  const rawButtons = params.buttons.flatMap((item) =>
+    Array.isArray(item) ? item : [item],
+  ) as MattermostInteractiveButtonInput[];
+
+  const buttons = rawButtons
+    .map((btn) => ({
+      id: normalizeStringifiedOptionalString(btn.id ?? btn.callback_data) ?? "",
+      name: normalizeStringifiedOptionalString(btn.text ?? btn.name ?? btn.label) ?? "",
+      style: btn.style ?? "default",
+      context:
+        typeof btn.context === "object" && btn.context !== null
+          ? {
+              ...btn.context,
+              [SIGNED_CHANNEL_ID_CONTEXT_KEY]: params.channelId,
+            }
+          : { [SIGNED_CHANNEL_ID_CONTEXT_KEY]: params.channelId },
+    }))
+    .filter((btn) => btn.id && btn.name);
+
+  if (buttons.length === 0) {
+    return undefined;
+  }
+
+  return {
+    attachments: buildButtonAttachments({
+      callbackUrl: params.callbackUrl,
+      accountId: params.accountId,
+      buttons,
+      text: params.text,
+    }),
+  };
+}
+
+// ── Request body reader ────────────────────────────────────────────────
+
+function readInteractionBody(req: IncomingMessage): Promise<string> {
+  return readRequestBodyWithLimit(req, {
+    maxBytes: INTERACTION_MAX_BODY_BYTES,
+    timeoutMs: INTERACTION_BODY_TIMEOUT_MS,
+  });
+}
+
+// ── HTTP handler ───────────────────────────────────────────────────────
+
+export function createMattermostInteractionHandler(params: {
+  client: MattermostClient;
+  botUserId: string;
+  accountId: string;
+  allowedSourceIps?: string[];
+  trustedProxies?: string[];
+  allowRealIpFallback?: boolean;
+  resolveSessionKey?: (params: {
+    channelId: string;
+    userId: string;
+    post: MattermostPost;
+  }) => Promise<string>;
+  handleInteraction?: (opts: {
+    payload: MattermostInteractionPayload;
+    userName: string;
+    actionId: string;
+    actionName: string;
+    originalMessage: string;
+    context: Record<string, unknown>;
+    post: MattermostPost;
+  }) => Promise<MattermostInteractionResponse | null>;
+  authorizeButtonClick?: (opts: {
+    payload: MattermostInteractionPayload;
+    post: MattermostPost;
+  }) => Promise<MattermostInteractionAuthorizationResult>;
+  dispatchButtonClick?: (opts: {
+    channelId: string;
+    userId: string;
+    userName: string;
+    actionId: string;
+    actionName: string;
+    postId: string;
+    post: MattermostPost;
+  }) => Promise<void>;
+  log?: (message: string) => void;
+}): (req: IncomingMessage, res: ServerResponse) => Promise<void> {
+  const { client, accountId, log } = params;
+  const core = getMattermostRuntime();
+
+  function parseInteractionPayload(raw: string): MattermostInteractionPayload {
+    try {
+      return JSON.parse(raw) as MattermostInteractionPayload;
+    } catch {
+      throw new Error("Mattermost interaction body was malformed JSON");
+    }
+  }
+
+  return async (req: IncomingMessage, res: ServerResponse) => {
+    // Only accept POST
+    if (req.method !== "POST") {
+      res.statusCode = 405;
+      res.setHeader("Allow", "POST");
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Method Not Allowed" }));
+      return;
+    }
+
+    if (
+      !isAllowedInteractionSource({
+        req,
+        allowedSourceIps: params.allowedSourceIps,
+        trustedProxies: params.trustedProxies,
+        allowRealIpFallback: params.allowRealIpFallback,
+      })
+    ) {
+      log?.(
+        `mattermost interaction: rejected callback source remote=${req.socket?.remoteAddress ?? "?"}`,
+      );
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Forbidden origin" }));
+      return;
+    }
+
+    let payload: MattermostInteractionPayload;
+    try {
+      const raw = await readInteractionBody(req);
+      payload = parseInteractionPayload(raw);
+    } catch (err) {
+      log?.(`mattermost interaction: failed to parse body: ${String(err)}`);
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Invalid request body" }));
+      return;
+    }
+
+    const context = payload.context;
+    if (!context) {
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing context" }));
+      return;
+    }
+
+    // Verify HMAC token
+    const token = context["_token"];
+    if (typeof token !== "string") {
+      log?.("mattermost interaction: missing _token in context");
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing token" }));
+      return;
+    }
+
+    // Strip _token before verification (it wasn't in the original context)
+    const { _token, ...contextWithoutToken } = context;
+    if (!verifyInteractionToken(contextWithoutToken, token, accountId)) {
+      log?.("mattermost interaction: invalid _token");
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Invalid token" }));
+      return;
+    }
+
+    const actionId = context.action_id;
+    if (typeof actionId !== "string") {
+      res.statusCode = 400;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Missing action_id in context" }));
+      return;
+    }
+
+    const signedChannelId =
+      typeof contextWithoutToken[SIGNED_CHANNEL_ID_CONTEXT_KEY] === "string"
+        ? contextWithoutToken[SIGNED_CHANNEL_ID_CONTEXT_KEY].trim()
+        : "";
+    if (signedChannelId && signedChannelId !== payload.channel_id) {
+      log?.(
+        `mattermost interaction: signed channel mismatch payload=${payload.channel_id} signed=${signedChannelId}`,
+      );
+      res.statusCode = 403;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Channel mismatch" }));
+      return;
+    }
+
+    const userName = payload.user_name ?? payload.user_id;
+    let originalMessage;
+    let originalPost: MattermostPost | null;
+    let clickedButtonName: string | null = null;
+    try {
+      originalPost = await client.request<MattermostPost>(`/posts/${payload.post_id}`);
+      const postChannelId = originalPost.channel_id?.trim();
+      if (!postChannelId || postChannelId !== payload.channel_id) {
+        log?.(
+          `mattermost interaction: post channel mismatch payload=${payload.channel_id} post=${postChannelId ?? "<missing>"}`,
+        );
+        res.statusCode = 403;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Post/channel mismatch" }));
+        return;
+      }
+      originalMessage = originalPost.message ?? "";
+
+      // Ensure the callback can only target an action that exists on the original post.
+      const postAttachments = Array.isArray(originalPost?.props?.attachments)
+        ? (originalPost.props.attachments as Array<{
+            actions?: Array<{ id?: string; name?: string }>;
+          }>)
+        : [];
+      for (const att of postAttachments) {
+        const match = att.actions?.find((a) => a.id === actionId);
+        if (match?.name) {
+          clickedButtonName = match.name;
+          break;
+        }
+      }
+      if (clickedButtonName === null) {
+        log?.(`mattermost interaction: action ${actionId} not found in post ${payload.post_id}`);
+        res.statusCode = 403;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Unknown action" }));
+        return;
+      }
+    } catch (err) {
+      log?.(`mattermost interaction: failed to validate post ${payload.post_id}: ${String(err)}`);
+      res.statusCode = 500;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Failed to validate interaction" }));
+      return;
+    }
+
+    if (!originalPost) {
+      log?.(`mattermost interaction: missing fetched post ${payload.post_id}`);
+      res.statusCode = 500;
+      res.setHeader("Content-Type", "application/json");
+      res.end(JSON.stringify({ error: "Failed to load interaction post" }));
+      return;
+    }
+
+    log?.(
+      `mattermost interaction: action=${actionId} user=${payload.user_name ?? payload.user_id} ` +
+        `post=${payload.post_id} channel=${payload.channel_id}`,
+    );
+
+    if (params.authorizeButtonClick) {
+      try {
+        const authorization = await params.authorizeButtonClick({
+          payload,
+          post: originalPost,
+        });
+        if (!authorization.ok) {
+          res.statusCode = authorization.statusCode ?? 200;
+          res.setHeader("Content-Type", "application/json");
+          res.end(
+            JSON.stringify(
+              authorization.response ?? {
+                ephemeral_text: "You are not allowed to use this action here.",
+              },
+            ),
+          );
+          return;
+        }
+      } catch (err) {
+        log?.(`mattermost interaction: authorization failed: ${String(err)}`);
+        res.statusCode = 500;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Interaction authorization failed" }));
+        return;
+      }
+    }
+
+    if (params.handleInteraction) {
+      try {
+        const response = await params.handleInteraction({
+          payload,
+          userName,
+          actionId,
+          actionName: clickedButtonName,
+          originalMessage,
+          context: contextWithoutToken,
+          post: originalPost,
+        });
+        if (response !== null) {
+          res.statusCode = 200;
+          res.setHeader("Content-Type", "application/json");
+          res.end(JSON.stringify(response));
+          return;
+        }
+      } catch (err) {
+        log?.(`mattermost interaction: custom handler failed: ${String(err)}`);
+        res.statusCode = 500;
+        res.setHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({ error: "Interaction handler failed" }));
+        return;
+      }
+    }
+
+    // Dispatch as system event so the agent can handle it.
+    // Wrapped in try/catch — the post update below must still run even if
+    // system event dispatch fails (e.g. missing sessionKey or channel lookup).
+    try {
+      const eventLabel =
+        `Mattermost button click: action="${actionId}" ` +
+        `by ${payload.user_name ?? payload.user_id} ` +
+        `in channel ${payload.channel_id}`;
+
+      const sessionKey = params.resolveSessionKey
+        ? await params.resolveSessionKey({
+            channelId: payload.channel_id,
+            userId: payload.user_id,
+            post: originalPost,
+          })
+        : `agent:main:mattermost:${accountId}:${payload.channel_id}`;
+
+      core.system.enqueueSystemEvent(eventLabel, {
+        sessionKey,
+        contextKey: `mattermost:interaction:${payload.post_id}:${actionId}`,
+      });
+    } catch (err) {
+      log?.(`mattermost interaction: system event dispatch failed: ${String(err)}`);
+    }
+
+    // Update the post via API to replace buttons with a completion indicator.
+    try {
+      await updateMattermostPost(client, payload.post_id, {
+        message: originalMessage,
+        props: {
+          attachments: [
+            {
+              text: `✓ **${clickedButtonName}** selected by @${userName}`,
+            },
+          ],
+        },
+      });
+    } catch (err) {
+      log?.(`mattermost interaction: failed to update post ${payload.post_id}: ${String(err)}`);
+    }
+
+    // Respond with empty JSON — the post update is handled above
+    res.statusCode = 200;
+    res.setHeader("Content-Type", "application/json");
+    res.end("{}");
+
+    // Dispatch a synthetic inbound message so the agent responds to the button click.
+    if (params.dispatchButtonClick) {
+      try {
+        await params.dispatchButtonClick({
+          channelId: payload.channel_id,
+          userId: payload.user_id,
+          userName,
+          actionId,
+          actionName: clickedButtonName,
+          postId: payload.post_id,
+          post: originalPost,
+        });
+      } catch (err) {
+        log?.(`mattermost interaction: dispatchButtonClick failed: ${String(err)}`);
+      }
+    }
+  };
+}

extensions/mattermost/src/mattermost/model-picker.test.ts

@@ -0,0 +1,279 @@
+// Mattermost tests cover model picker plugin behavior.
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import {
+  buildMattermostAllowedModelRefs,
+  parseMattermostModelPickerContext,
+  renderMattermostModelSummaryView,
+  renderMattermostModelsPickerView,
+  renderMattermostProviderPickerView,
+  resolveMattermostModelPickerCurrentModel,
+  resolveMattermostModelPickerEntry,
+} from "./model-picker.js";
+
+const data = {
+  byProvider: new Map<string, Set<string>>([
+    ["anthropic", new Set(["claude-opus-4-5", "claude-sonnet-4-5"])],
+    ["openai", new Set(["gpt-4.1", "gpt-5"])],
+  ]),
+  providers: ["anthropic", "openai"],
+  resolvedDefault: {
+    provider: "anthropic",
+    model: "claude-opus-4-5",
+  },
+  modelNames: new Map<string, string>(),
+};
+
+describe("Mattermost model picker", () => {
+  it("resolves bare /model and /models entry points", () => {
+    expect(resolveMattermostModelPickerEntry("/model")).toEqual({ kind: "summary" });
+    expect(resolveMattermostModelPickerEntry("/models")).toEqual({ kind: "providers" });
+    expect(resolveMattermostModelPickerEntry("/models OpenAI")).toEqual({
+      kind: "models",
+      provider: "openai",
+    });
+    expect(resolveMattermostModelPickerEntry("/model openai/gpt-5")).toBeNull();
+  });
+
+  it("builds the allowed model refs set", () => {
+    expect(buildMattermostAllowedModelRefs(data)).toEqual(
+      new Set([
+        "anthropic/claude-opus-4-5",
+        "anthropic/claude-sonnet-4-5",
+        "openai/gpt-4.1",
+        "openai/gpt-5",
+      ]),
+    );
+  });
+
+  it("renders the summary view with a browse button", () => {
+    const view = renderMattermostModelSummaryView({
+      ownerUserId: "user-1",
+      currentModel: "openai/gpt-5",
+    });
+
+    expect(view.text).toContain("Current: openai/gpt-5");
+    expect(view.text).toContain("Tap below to browse models");
+    expect(view.text).toContain("/oc_model <provider/model> to switch");
+    expect(view.text).toContain("Browse keeps the current runtime");
+    expect(view.text).toContain("/oc_model <provider/model> --runtime <runtime>");
+    const firstRow = view.buttons[0];
+    if (!firstRow) {
+      throw new Error("expected Mattermost model picker button row");
+    }
+    const browseButton = firstRow[0];
+    if (!browseButton) {
+      throw new Error("expected Mattermost browse providers button");
+    }
+    expect(browseButton.text).toBe("Browse providers");
+  });
+
+  it("trims accidental model spacing in Mattermost current-model text", () => {
+    const view = renderMattermostModelSummaryView({
+      ownerUserId: "user-1",
+      currentModel: " OpenAI/ gpt-5 ",
+    });
+
+    expect(view.text).toContain("Current: openai/gpt-5");
+  });
+
+  it("renders providers and models with Telegram-style navigation", () => {
+    const providersView = renderMattermostProviderPickerView({
+      ownerUserId: "user-1",
+      data,
+      currentModel: "openai/gpt-5",
+    });
+    const providerTexts = providersView.buttons.flat().map((button) => button.text);
+    expect(providerTexts).toContain("anthropic (2)");
+    expect(providerTexts).toContain("openai (2)");
+
+    const modelsView = renderMattermostModelsPickerView({
+      ownerUserId: "user-1",
+      data,
+      provider: "openai",
+      page: 1,
+      currentModel: "openai/gpt-5",
+    });
+    const modelTexts = modelsView.buttons.flat().map((button) => button.text);
+    expect(modelsView.text).toContain("Models (openai) - 2 available");
+    expect(modelTexts).toContain("gpt-5 [current]");
+    expect(modelTexts).toContain("Back to providers");
+  });
+
+  it("renders unique alphanumeric action ids per button", () => {
+    const modelsView = renderMattermostModelsPickerView({
+      ownerUserId: "user-1",
+      data,
+      provider: "openai",
+      page: 1,
+      currentModel: "openai/gpt-5",
+    });
+
+    const ids = modelsView.buttons.flat().map((button) => button.id);
+    expect(ids.every((id) => typeof id === "string" && /^[a-z0-9]+$/.test(id))).toBe(true);
+    expect(new Set(ids).size).toBe(ids.length);
+  });
+
+  it("parses signed picker contexts", () => {
+    expect(
+      parseMattermostModelPickerContext({
+        oc_model_picker: true,
+        action: "select",
+        ownerUserId: "user-1",
+        provider: "openai",
+        page: 2,
+        model: "gpt-5",
+      }),
+    ).toEqual({
+      action: "select",
+      ownerUserId: "user-1",
+      provider: "openai",
+      page: 2,
+      model: "gpt-5",
+    });
+    expect(parseMattermostModelPickerContext({ action: "select" })).toBeNull();
+  });
+
+  it("does not coerce partial page strings in signed picker contexts", () => {
+    expect(
+      parseMattermostModelPickerContext({
+        oc_model_picker: true,
+        action: "list",
+        ownerUserId: "user-1",
+        provider: "openai",
+        page: "+02",
+      }),
+    ).toEqual({
+      action: "list",
+      ownerUserId: "user-1",
+      provider: "openai",
+      page: 2,
+    });
+    expect(
+      parseMattermostModelPickerContext({
+        oc_model_picker: true,
+        action: "list",
+        ownerUserId: "user-1",
+        provider: "openai",
+        page: "2next",
+      }),
+    ).toEqual({
+      action: "list",
+      ownerUserId: "user-1",
+      provider: "openai",
+      page: 1,
+    });
+  });
+
+  it("falls back to the routed agent default model when no override is stored", () => {
+    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), "mm-model-picker-"));
+    try {
+      const cfg: OpenClawConfig = {
+        session: {
+          store: path.join(testDir, "{agentId}.json"),
+        },
+        agents: {
+          defaults: {
+            model: "anthropic/claude-opus-4-5",
+          },
+          list: [
+            {
+              id: "support",
+              model: "openai/gpt-5",
+            },
+          ],
+        },
+      };
+      const providerData = {
+        byProvider: new Map<string, Set<string>>([
+          ["anthropic", new Set(["claude-opus-4-5"])],
+          ["openai", new Set(["gpt-5"])],
+        ]),
+        providers: ["anthropic", "openai"],
+        resolvedDefault: {
+          provider: "openai",
+          model: "gpt-5",
+        },
+        modelNames: new Map<string, string>(),
+      };
+
+      expect(
+        resolveMattermostModelPickerCurrentModel({
+          cfg,
+          route: {
+            agentId: "support",
+            sessionKey: "agent:support:main",
+          },
+          data: providerData,
+        }),
+      ).toBe("openai/gpt-5");
+    } finally {
+      fs.rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+
+  it("resolves current and parent model overrides from targeted session entries", () => {
+    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), "mm-model-picker-"));
+    try {
+      const storePath = path.join(testDir, "{agentId}.json");
+      const supportStorePath = path.join(testDir, "support.json");
+      const parentSessionKey = "agent:support:mattermost:default:channel-1";
+      const childSessionKey = "agent:support:mattermost:default:child-with-explicit-parent";
+      const directSessionKey = "agent:support:mattermost:default:direct-1";
+      fs.writeFileSync(
+        supportStorePath,
+        JSON.stringify(
+          {
+            [parentSessionKey]: {
+              providerOverride: "anthropic",
+              modelOverride: "claude-sonnet-4-5",
+              sessionId: "parent-session",
+            },
+            [childSessionKey]: {
+              parentSessionKey,
+              sessionId: "child-session",
+            },
+            [directSessionKey]: {
+              providerOverride: "openai",
+              modelOverride: "gpt-5",
+              sessionId: "direct-session",
+            },
+          },
+          null,
+          2,
+        ),
+      );
+      const cfg: OpenClawConfig = {
+        session: {
+          store: storePath,
+        },
+      };
+
+      expect(
+        resolveMattermostModelPickerCurrentModel({
+          cfg,
+          route: {
+            agentId: "support",
+            sessionKey: directSessionKey,
+          },
+          data,
+        }),
+      ).toBe("openai/gpt-5");
+      expect(
+        resolveMattermostModelPickerCurrentModel({
+          cfg,
+          route: {
+            agentId: "support",
+            sessionKey: childSessionKey,
+          },
+          data,
+        }),
+      ).toBe("anthropic/claude-sonnet-4-5");
+    } finally {
+      fs.rmSync(testDir, { recursive: true, force: true });
+    }
+  });
+});

extensions/mattermost/src/mattermost/model-picker.ts

@@ -0,0 +1,411 @@
+// Mattermost plugin module implements model picker behavior.
+import { createHash } from "node:crypto";
+import {
+  resolveStoredModelOverride,
+  type ModelsProviderData,
+} from "openclaw/plugin-sdk/command-auth-native";
+import type { OpenClawConfig } from "openclaw/plugin-sdk/core";
+import { parseStrictInteger } from "openclaw/plugin-sdk/number-runtime";
+import { normalizeProviderId } from "openclaw/plugin-sdk/provider-model-shared";
+import { getSessionEntry, resolveStorePath } from "openclaw/plugin-sdk/session-store-runtime";
+import {
+  normalizeOptionalString,
+  normalizeStringifiedOptionalString,
+} from "openclaw/plugin-sdk/string-coerce-runtime";
+import type { MattermostInteractiveButtonInput } from "./interactions.js";
+
+const MATTERMOST_MODEL_PICKER_CONTEXT_KEY = "oc_model_picker";
+const MODELS_PAGE_SIZE = 8;
+const ACTION_IDS = {
+  providers: "mdlprov",
+  list: "mdllist",
+  select: "mdlsel",
+  back: "mdlback",
+} as const;
+
+type MattermostModelPickerEntry =
+  | { kind: "summary" }
+  | { kind: "providers" }
+  | { kind: "models"; provider: string };
+
+type MattermostModelPickerState =
+  | { action: "providers"; ownerUserId: string }
+  | { action: "back"; ownerUserId: string }
+  | { action: "list"; ownerUserId: string; provider: string; page: number }
+  | { action: "select"; ownerUserId: string; provider: string; page: number; model: string };
+
+type MattermostModelPickerRenderedView = {
+  text: string;
+  buttons: MattermostInteractiveButtonInput[][];
+};
+
+function splitModelRef(modelRef?: string | null): { provider: string; model: string } | null {
+  const trimmed = normalizeOptionalString(modelRef);
+  const match = trimmed?.match(/^([^/]+)\/(.+)$/u);
+  if (!match) {
+    return null;
+  }
+  const provider = normalizeProviderId(match[1]);
+  // Mattermost copy should normalize accidental whitespace around the model.
+  const model = normalizeOptionalString(match[2]);
+  if (!provider || !model) {
+    return null;
+  }
+  return { provider, model };
+}
+
+function readContextString(context: Record<string, unknown>, key: string, fallback = ""): string {
+  const value = context[key];
+  return typeof value === "string" ? value : fallback;
+}
+
+function readContextNumber(context: Record<string, unknown>, key: string): number | undefined {
+  const value = context[key];
+  if (typeof value === "number" && Number.isFinite(value)) {
+    return value;
+  }
+  if (typeof value === "string") {
+    return parseStrictInteger(value);
+  }
+  return undefined;
+}
+
+function normalizePage(value: number | undefined): number {
+  if (!Number.isFinite(value)) {
+    return 1;
+  }
+  return Math.max(1, Math.floor(value as number));
+}
+
+function paginateItems<T>(items: T[], page?: number, pageSize = MODELS_PAGE_SIZE) {
+  const totalPages = Math.max(1, Math.ceil(items.length / pageSize));
+  const safePage = Math.max(1, Math.min(normalizePage(page), totalPages));
+  const start = (safePage - 1) * pageSize;
+  return {
+    items: items.slice(start, start + pageSize),
+    page: safePage,
+    totalPages,
+    hasPrev: safePage > 1,
+    hasNext: safePage < totalPages,
+    totalItems: items.length,
+  };
+}
+
+function buildContext(state: MattermostModelPickerState): Record<string, unknown> {
+  return {
+    [MATTERMOST_MODEL_PICKER_CONTEXT_KEY]: true,
+    ...state,
+  };
+}
+
+function buildButtonId(state: MattermostModelPickerState): string {
+  const digest = createHash("sha256").update(JSON.stringify(state)).digest("hex").slice(0, 12);
+  return `${ACTION_IDS[state.action]}${digest}`;
+}
+
+function buildButton(params: {
+  action: MattermostModelPickerState["action"];
+  ownerUserId: string;
+  text: string;
+  provider?: string;
+  page?: number;
+  model?: string;
+  style?: "default" | "primary" | "danger";
+}): MattermostInteractiveButtonInput {
+  const baseState =
+    params.action === "providers" || params.action === "back"
+      ? {
+          action: params.action,
+          ownerUserId: params.ownerUserId,
+        }
+      : params.action === "list"
+        ? {
+            action: "list" as const,
+            ownerUserId: params.ownerUserId,
+            provider: normalizeProviderId(params.provider ?? ""),
+            page: normalizePage(params.page),
+          }
+        : {
+            action: "select" as const,
+            ownerUserId: params.ownerUserId,
+            provider: normalizeProviderId(params.provider ?? ""),
+            page: normalizePage(params.page),
+            model: normalizeStringifiedOptionalString(params.model) ?? "",
+          };
+
+  return {
+    // Mattermost requires action IDs to be unique within a post.
+    id: buildButtonId(baseState),
+    text: params.text,
+    ...(params.style ? { style: params.style } : {}),
+    context: buildContext(baseState),
+  };
+}
+
+function getProviderModels(data: ModelsProviderData, provider: string): string[] {
+  return [...(data.byProvider.get(normalizeProviderId(provider)) ?? new Set<string>())].toSorted();
+}
+
+function formatCurrentModelLine(currentModel?: string): string {
+  const parsed = splitModelRef(currentModel);
+  if (!parsed) {
+    return "Current: default";
+  }
+  return `Current: ${parsed.provider}/${parsed.model}`;
+}
+
+export function resolveMattermostModelPickerEntry(
+  commandText: string,
+): MattermostModelPickerEntry | null {
+  const normalized = commandText.trim().replace(/\s+/g, " ");
+  if (/^\/model$/i.test(normalized)) {
+    return { kind: "summary" };
+  }
+  if (/^\/models$/i.test(normalized)) {
+    return { kind: "providers" };
+  }
+  const providerMatch = normalized.match(/^\/models\s+(\S+)$/i);
+  if (!providerMatch?.[1]) {
+    return null;
+  }
+  return {
+    kind: "models",
+    provider: normalizeProviderId(providerMatch[1]),
+  };
+}
+
+export function parseMattermostModelPickerContext(
+  context: Record<string, unknown>,
+): MattermostModelPickerState | null {
+  if (!context || context[MATTERMOST_MODEL_PICKER_CONTEXT_KEY] !== true) {
+    return null;
+  }
+
+  const ownerUserId = normalizeOptionalString(readContextString(context, "ownerUserId")) ?? "";
+  const action = normalizeOptionalString(readContextString(context, "action")) ?? "";
+  if (!ownerUserId) {
+    return null;
+  }
+
+  if (action === "providers" || action === "back") {
+    return { action, ownerUserId };
+  }
+
+  const provider = normalizeProviderId(readContextString(context, "provider"));
+  const page = readContextNumber(context, "page");
+  if (!provider) {
+    return null;
+  }
+
+  if (action === "list") {
+    return {
+      action,
+      ownerUserId,
+      provider,
+      page: normalizePage(page),
+    };
+  }
+
+  if (action === "select") {
+    const model = normalizeOptionalString(readContextString(context, "model")) ?? "";
+    if (!model) {
+      return null;
+    }
+    return {
+      action,
+      ownerUserId,
+      provider,
+      page: normalizePage(page),
+      model,
+    };
+  }
+
+  return null;
+}
+
+export function buildMattermostAllowedModelRefs(data: ModelsProviderData): Set<string> {
+  const refs = new Set<string>();
+  for (const provider of data.providers) {
+    for (const model of data.byProvider.get(provider) ?? []) {
+      refs.add(`${provider}/${model}`);
+    }
+  }
+  return refs;
+}
+
+export function resolveMattermostModelPickerCurrentModel(params: {
+  cfg: OpenClawConfig;
+  route: { agentId: string; sessionKey: string };
+  data: ModelsProviderData;
+  readConsistency?: "latest";
+}): string {
+  const fallback = `${params.data.resolvedDefault.provider}/${params.data.resolvedDefault.model}`;
+  try {
+    const storePath = resolveStorePath(params.cfg.session?.store, {
+      agentId: params.route.agentId,
+    });
+    const sessionEntry = getSessionEntry({
+      storePath,
+      sessionKey: params.route.sessionKey,
+      ...(params.readConsistency === "latest" ? { readConsistency: "latest" as const } : {}),
+    });
+    const override = resolveStoredModelOverride({
+      sessionEntry,
+      loadSessionEntry: (sessionKey) =>
+        getSessionEntry({
+          storePath,
+          sessionKey,
+          ...(params.readConsistency === "latest" ? { readConsistency: "latest" as const } : {}),
+        }),
+      sessionKey: params.route.sessionKey,
+      parentSessionKey: sessionEntry?.parentSessionKey,
+      defaultProvider: params.data.resolvedDefault.provider,
+    });
+    if (!override?.model) {
+      return fallback;
+    }
+    const provider = (override.provider || params.data.resolvedDefault.provider).trim();
+    return provider ? `${provider}/${override.model}` : fallback;
+  } catch {
+    return fallback;
+  }
+}
+
+export function renderMattermostModelSummaryView(params: {
+  ownerUserId: string;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  return {
+    text: [
+      formatCurrentModelLine(params.currentModel),
+      "",
+      "Tap below to browse models, or use:",
+      "/oc_model <provider/model> to switch",
+      "Browse keeps the current runtime; use /oc_model <provider/model> --runtime <runtime> to switch runtime too",
+      "/oc_model status for details",
+    ].join("\n"),
+    buttons: [
+      [
+        buildButton({
+          action: "providers",
+          ownerUserId: params.ownerUserId,
+          text: "Browse providers",
+          style: "primary",
+        }),
+      ],
+    ],
+  };
+}
+
+export function renderMattermostProviderPickerView(params: {
+  ownerUserId: string;
+  data: ModelsProviderData;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  const currentProvider = splitModelRef(params.currentModel)?.provider;
+  const rows = params.data.providers.map((provider) => [
+    buildButton({
+      action: "list",
+      ownerUserId: params.ownerUserId,
+      text: `${provider} (${params.data.byProvider.get(provider)?.size ?? 0})`,
+      provider,
+      page: 1,
+      style: provider === currentProvider ? "primary" : "default",
+    }),
+  ]);
+
+  return {
+    text: [formatCurrentModelLine(params.currentModel), "", "Select a provider:"].join("\n"),
+    buttons: rows,
+  };
+}
+
+export function renderMattermostModelsPickerView(params: {
+  ownerUserId: string;
+  data: ModelsProviderData;
+  provider: string;
+  page?: number;
+  currentModel?: string;
+}): MattermostModelPickerRenderedView {
+  const provider = normalizeProviderId(params.provider);
+  const models = getProviderModels(params.data, provider);
+  const current = splitModelRef(params.currentModel);
+
+  if (models.length === 0) {
+    return {
+      text: [formatCurrentModelLine(params.currentModel), "", `Unknown provider: ${provider}`].join(
+        "\n",
+      ),
+      buttons: [
+        [
+          buildButton({
+            action: "back",
+            ownerUserId: params.ownerUserId,
+            text: "Back to providers",
+          }),
+        ],
+      ],
+    };
+  }
+
+  const page = paginateItems(models, params.page);
+  const rows: MattermostInteractiveButtonInput[][] = page.items.map((model) => {
+    const isCurrent = current?.provider === provider && current?.model === model;
+    return [
+      buildButton({
+        action: "select",
+        ownerUserId: params.ownerUserId,
+        text: isCurrent ? `${model} [current]` : model,
+        provider,
+        model,
+        page: page.page,
+        style: isCurrent ? "primary" : "default",
+      }),
+    ];
+  });
+
+  const navRow: MattermostInteractiveButtonInput[] = [];
+  if (page.hasPrev) {
+    navRow.push(
+      buildButton({
+        action: "list",
+        ownerUserId: params.ownerUserId,
+        text: "Prev",
+        provider,
+        page: page.page - 1,
+      }),
+    );
+  }
+  if (page.hasNext) {
+    navRow.push(
+      buildButton({
+        action: "list",
+        ownerUserId: params.ownerUserId,
+        text: "Next",
+        provider,
+        page: page.page + 1,
+      }),
+    );
+  }
+  if (navRow.length > 0) {
+    rows.push(navRow);
+  }
+
+  rows.push([
+    buildButton({
+      action: "back",
+      ownerUserId: params.ownerUserId,
+      text: "Back to providers",
+    }),
+  ]);
+
+  return {
+    text: [
+      `Models (${provider}) - ${page.totalItems} available`,
+      formatCurrentModelLine(params.currentModel),
+      `Page ${page.page}/${page.totalPages}`,
+      "Select a model to switch immediately.",
+    ].join("\n"),
+    buttons: rows,
+  };
+}

extensions/mattermost/src/mattermost/monitor-auth.test.ts

@@ -0,0 +1,180 @@
+// Mattermost tests cover monitor auth plugin behavior.
+import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const isDangerousNameMatchingEnabled = vi.hoisted(() => vi.fn());
+const resolveAllowlistMatchSimple = vi.hoisted(() => vi.fn());
+
+vi.mock("./runtime-api.js", () => ({
+  isDangerousNameMatchingEnabled,
+  resolveAllowlistMatchSimple,
+}));
+
+describe("mattermost monitor auth", () => {
+  let authorizeMattermostCommandInvocation: typeof import("./monitor-auth.js").authorizeMattermostCommandInvocation;
+  let formatMattermostDirectMessageDropLog: typeof import("./monitor-auth.js").formatMattermostDirectMessageDropLog;
+  let isMattermostSenderAllowed: typeof import("./monitor-auth.js").isMattermostSenderAllowed;
+  let normalizeMattermostAllowEntry: typeof import("./monitor-auth.js").normalizeMattermostAllowEntry;
+  let normalizeMattermostAllowList: typeof import("./monitor-auth.js").normalizeMattermostAllowList;
+
+  beforeAll(async () => {
+    ({
+      authorizeMattermostCommandInvocation,
+      formatMattermostDirectMessageDropLog,
+      isMattermostSenderAllowed,
+      normalizeMattermostAllowEntry,
+      normalizeMattermostAllowList,
+    } = await import("./monitor-auth.js"));
+  });
+
+  beforeEach(() => {
+    isDangerousNameMatchingEnabled.mockReset();
+    resolveAllowlistMatchSimple.mockReset();
+  });
+
+  it("normalizes allowlist entries", () => {
+    expect(normalizeMattermostAllowEntry(" @Alice ")).toBe("alice");
+    expect(normalizeMattermostAllowEntry("mattermost:Bob")).toBe("bob");
+    expect(normalizeMattermostAllowEntry("accessGroup:Ops")).toBe("accessGroup:Ops");
+    expect(normalizeMattermostAllowEntry("*")).toBe("*");
+    expect(normalizeMattermostAllowList([" Alice ", "user:alice", "ALICE", "*"])).toEqual([
+      "alice",
+      "*",
+    ]);
+  });
+
+  it("checks sender allowlists against normalized ids and names", () => {
+    resolveAllowlistMatchSimple.mockReturnValue({ allowed: true });
+    expect(
+      isMattermostSenderAllowed({
+        senderId: "@Alice",
+        senderName: "Alice",
+        allowFrom: [" mattermost:alice "],
+        allowNameMatching: true,
+      }),
+    ).toBe(true);
+    expect(resolveAllowlistMatchSimple).toHaveBeenCalledWith({
+      allowFrom: ["alice"],
+      senderId: "alice",
+      senderName: "alice",
+      allowNameMatching: true,
+    });
+  });
+
+  it("formats direct-message drops with the ingress reason and open-policy hint", () => {
+    expect(
+      formatMattermostDirectMessageDropLog({
+        senderId: "alice-id",
+        dmPolicy: "open",
+        reasonCode: "dm_policy_not_allowlisted",
+      }),
+    ).toBe(
+      "mattermost: drop dm sender=alice-id (dmPolicy=open reason=dm_policy_not_allowlisted hint=add-allowFrom-wildcard)",
+    );
+  });
+
+  it("resolves direct command authorization from shared ingress", async () => {
+    isDangerousNameMatchingEnabled.mockReturnValue(false);
+    resolveAllowlistMatchSimple.mockReturnValue({ allowed: false });
+
+    await expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { dmPolicy: "open" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "dm-1",
+        channelInfo: { type: "D", name: "alice", display_name: "Alice" } as never,
+        allowTextCommands: true,
+        hasControlCommand: true,
+      }),
+    ).resolves.toEqual({
+      ok: false,
+      denyReason: "unauthorized",
+      commandAuthorized: false,
+      channelInfo: { type: "D", name: "alice", display_name: "Alice" },
+      kind: "direct",
+      chatType: "direct",
+      channelName: "alice",
+      channelDisplay: "Alice",
+      roomLabel: "#alice",
+    });
+
+    resolveAllowlistMatchSimple.mockReturnValue({ allowed: true });
+
+    await expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { dmPolicy: "open", allowFrom: ["*"] },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "dm-1",
+        channelInfo: { type: "D", name: "alice", display_name: "Alice" } as never,
+        allowTextCommands: false,
+        hasControlCommand: false,
+      }),
+    ).resolves.toEqual({
+      ok: true,
+      commandAuthorized: true,
+      channelInfo: { type: "D", name: "alice", display_name: "Alice" },
+      kind: "direct",
+      chatType: "direct",
+      channelName: "alice",
+      channelDisplay: "Alice",
+      roomLabel: "#alice",
+    });
+
+    await expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { dmPolicy: "disabled" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "dm-1",
+        channelInfo: { type: "D", name: "alice", display_name: "Alice" } as never,
+        allowTextCommands: false,
+        hasControlCommand: false,
+      }),
+    ).resolves.toEqual({
+      ok: false,
+      denyReason: "dm-disabled",
+      commandAuthorized: false,
+      channelInfo: { type: "D", name: "alice", display_name: "Alice" },
+      kind: "direct",
+      chatType: "direct",
+      channelName: "alice",
+      channelDisplay: "Alice",
+      roomLabel: "#alice",
+    });
+
+    await expect(
+      authorizeMattermostCommandInvocation({
+        account: {
+          config: { groupPolicy: "allowlist" },
+        } as never,
+        cfg: {} as never,
+        senderId: "alice",
+        senderName: "Alice",
+        channelId: "chan-1",
+        channelInfo: { type: "O", name: "town-square", display_name: "Town Square" } as never,
+        allowTextCommands: true,
+        hasControlCommand: false,
+      }),
+    ).resolves.toEqual({
+      ok: false,
+      denyReason: "channel-no-allowlist",
+      commandAuthorized: false,
+      channelInfo: { type: "O", name: "town-square", display_name: "Town Square" },
+      kind: "channel",
+      chatType: "channel",
+      channelName: "town-square",
+      channelDisplay: "Town Square",
+      roomLabel: "#town-square",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-auth.ts

@@ -0,0 +1,335 @@
+// Mattermost plugin module implements monitor auth behavior.
+import { parseAccessGroupAllowFromEntry } from "openclaw/plugin-sdk/access-groups";
+import {
+  type ChannelIngressDecision,
+  type ChannelIngressEventInput,
+  type ChannelIngressIdentifierKind,
+  resolveStableChannelMessageIngress,
+  type StableChannelIngressIdentityParams,
+} from "openclaw/plugin-sdk/channel-ingress-runtime";
+import {
+  normalizeLowercaseStringOrEmpty,
+  uniqueStrings,
+} from "openclaw/plugin-sdk/string-coerce-runtime";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import type { MattermostChannel } from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+import { isDangerousNameMatchingEnabled, resolveAllowlistMatchSimple } from "./runtime-api.js";
+
+const MATTERMOST_USER_NAME_KIND =
+  "plugin:mattermost-user-name" as const satisfies ChannelIngressIdentifierKind;
+const mattermostIngressIdentity = {
+  key: "sender-id",
+  normalize: normalizeMattermostAllowEntry,
+  aliases: [
+    {
+      key: "sender-name",
+      kind: MATTERMOST_USER_NAME_KIND,
+      normalizeEntry: normalizeMattermostAllowEntry,
+      normalizeSubject: normalizeMattermostAllowEntry,
+      dangerous: true,
+    },
+  ],
+  isWildcardEntry: (entry) => normalizeMattermostAllowEntry(entry) === "*",
+  resolveEntryId: ({ entryIndex, fieldKey }) =>
+    `mattermost-entry-${entryIndex + 1}:${fieldKey === "sender-name" ? "name" : "user"}`,
+} satisfies StableChannelIngressIdentityParams;
+
+export function normalizeMattermostAllowEntry(entry: string): string {
+  const trimmed = entry.trim();
+  if (!trimmed) {
+    return "";
+  }
+  if (trimmed === "*") {
+    return "*";
+  }
+  const accessGroupName = parseAccessGroupAllowFromEntry(trimmed);
+  if (accessGroupName) {
+    return `accessGroup:${accessGroupName}`;
+  }
+  const normalized = trimmed
+    .replace(/^(mattermost|user):/i, "")
+    .replace(/^@/, "")
+    .trim();
+  return normalized ? normalizeLowercaseStringOrEmpty(normalized) : "";
+}
+
+export function normalizeMattermostAllowList(entries: Array<string | number>): string[] {
+  const normalized = entries
+    .map((entry) => normalizeMattermostAllowEntry(String(entry)))
+    .filter(Boolean);
+  return uniqueStrings(normalized);
+}
+
+export function formatMattermostDirectMessageDropLog(params: {
+  senderId: string;
+  dmPolicy: string;
+  reasonCode?: string;
+}): string {
+  const reason = params.reasonCode ? ` reason=${params.reasonCode}` : "";
+  const hint =
+    params.dmPolicy === "open" && params.reasonCode === "dm_policy_not_allowlisted"
+      ? " hint=add-allowFrom-wildcard"
+      : "";
+  return `mattermost: drop dm sender=${params.senderId} (dmPolicy=${params.dmPolicy}${reason}${hint})`;
+}
+
+export function isMattermostSenderAllowed(params: {
+  senderId: string;
+  senderName?: string;
+  allowFrom: string[];
+  allowNameMatching?: boolean;
+}): boolean {
+  const allowFrom = normalizeMattermostAllowList(params.allowFrom);
+  if (allowFrom.length === 0) {
+    return false;
+  }
+  const match = resolveAllowlistMatchSimple({
+    allowFrom,
+    senderId: normalizeMattermostAllowEntry(params.senderId),
+    senderName: params.senderName ? normalizeMattermostAllowEntry(params.senderName) : undefined,
+    allowNameMatching: params.allowNameMatching,
+  });
+  return match.allowed;
+}
+
+function mapMattermostChannelKind(channelType?: string | null): "direct" | "group" | "channel" {
+  const normalized = channelType?.trim().toUpperCase();
+  if (normalized === "D") {
+    return "direct";
+  }
+  if (normalized === "G" || normalized === "P") {
+    return "group";
+  }
+  return "channel";
+}
+
+export type MattermostCommandAuthDecision =
+  | {
+      ok: true;
+      commandAuthorized: boolean;
+      channelInfo: MattermostChannel;
+      kind: "direct" | "group" | "channel";
+      chatType: "direct" | "group" | "channel";
+      channelName: string;
+      channelDisplay: string;
+      roomLabel: string;
+    }
+  | {
+      ok: false;
+      denyReason:
+        | "unknown-channel"
+        | "dm-disabled"
+        | "dm-pairing"
+        | "unauthorized"
+        | "channels-disabled"
+        | "channel-no-allowlist";
+      commandAuthorized: false;
+      channelInfo: MattermostChannel | null;
+      kind: "direct" | "group" | "channel";
+      chatType: "direct" | "group" | "channel";
+      channelName: string;
+      channelDisplay: string;
+      roomLabel: string;
+    };
+
+type MattermostCommandDenyReason = Extract<
+  MattermostCommandAuthDecision,
+  { ok: false }
+>["denyReason"];
+
+export async function resolveMattermostMonitorInboundAccess(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  senderId: string;
+  senderName: string;
+  channelId: string;
+  kind: "direct" | "group" | "channel";
+  groupPolicy: "allowlist" | "open" | "disabled";
+  storeAllowFrom?: Array<string | number> | null;
+  readStoreAllowFrom?: () => Promise<Array<string | number>>;
+  allowTextCommands: boolean;
+  hasControlCommand: boolean;
+  eventKind?: ChannelIngressEventInput["kind"];
+  mayPair?: boolean;
+}) {
+  const {
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    kind,
+    groupPolicy,
+    storeAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+  } = params;
+  const dmPolicy = account.config.dmPolicy ?? "pairing";
+  const allowNameMatching = isDangerousNameMatchingEnabled(account.config);
+  const configAllowFrom = account.config.allowFrom ?? [];
+  const configGroupAllowFrom = account.config.groupAllowFrom ?? [];
+  const readStoreAllowFrom =
+    params.readStoreAllowFrom ??
+    (storeAllowFrom != null ? async () => [...storeAllowFrom] : undefined);
+  const ingress = await resolveStableChannelMessageIngress({
+    channelId: "mattermost",
+    accountId: account.accountId,
+    identity: mattermostIngressIdentity,
+    cfg,
+    ...(readStoreAllowFrom ? { readStoreAllowFrom } : {}),
+    useDefaultPairingStore: params.readStoreAllowFrom === undefined && storeAllowFrom == null,
+    subject: {
+      stableId: senderId,
+      aliases: { "sender-name": senderName },
+    },
+    conversation: {
+      kind,
+      id: channelId,
+    },
+    event: {
+      kind: params.eventKind ?? "message",
+      authMode: "inbound",
+      mayPair: params.mayPair ?? true,
+    },
+    dmPolicy,
+    groupPolicy,
+    policy: {
+      groupAllowFromFallbackToAllowFrom: true,
+      mutableIdentifierMatching: allowNameMatching ? "enabled" : "disabled",
+    },
+    allowFrom: configAllowFrom,
+    groupAllowFrom: configGroupAllowFrom,
+    command: {
+      allowTextCommands,
+      hasControlCommand: allowTextCommands && hasControlCommand,
+      directGroupAllowFrom: kind === "direct" ? "effective" : "none",
+    },
+  });
+  return ingress;
+}
+
+function resolveMattermostCommandDenyReason(params: {
+  decision: ChannelIngressDecision;
+  kind: "direct" | "group" | "channel";
+  dmPolicy: string;
+}): MattermostCommandDenyReason | null {
+  if (params.decision.decision === "allow") {
+    return null;
+  }
+  if (params.kind === "direct") {
+    if (params.decision.reasonCode === "dm_policy_disabled") {
+      return "dm-disabled";
+    }
+    if (
+      params.dmPolicy === "pairing" &&
+      (params.decision.admission === "pairing-required" ||
+        params.decision.reasonCode === "dm_policy_pairing_required")
+    ) {
+      return "dm-pairing";
+    }
+    return "unauthorized";
+  }
+  if (params.decision.reasonCode === "group_policy_disabled") {
+    return "channels-disabled";
+  }
+  if (params.decision.reasonCode === "group_policy_empty_allowlist") {
+    return "channel-no-allowlist";
+  }
+  return "unauthorized";
+}
+
+export async function authorizeMattermostCommandInvocation(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  senderId: string;
+  senderName: string;
+  channelId: string;
+  channelInfo: MattermostChannel | null;
+  storeAllowFrom?: Array<string | number> | null;
+  readStoreAllowFrom?: () => Promise<Array<string | number>>;
+  allowTextCommands: boolean;
+  hasControlCommand: boolean;
+}): Promise<MattermostCommandAuthDecision> {
+  const {
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    channelInfo,
+    storeAllowFrom,
+    readStoreAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+  } = params;
+
+  if (!channelInfo?.type) {
+    return {
+      ok: false,
+      denyReason: "unknown-channel",
+      commandAuthorized: false,
+      channelInfo,
+      kind: "channel",
+      chatType: "channel",
+      channelName: "",
+      channelDisplay: "",
+      roomLabel: `#${channelId}`,
+    };
+  }
+
+  const kind = mapMattermostChannelKind(channelInfo.type);
+  const chatType = kind;
+  const channelName = channelInfo.name ?? "";
+  const channelDisplay = channelInfo.display_name ?? channelName;
+  const roomLabel = channelName ? `#${channelName}` : channelDisplay || `#${channelId}`;
+
+  const defaultGroupPolicy = cfg.channels?.defaults?.groupPolicy;
+  const groupPolicy = account.config.groupPolicy ?? defaultGroupPolicy ?? "allowlist";
+
+  const ingress = await resolveMattermostMonitorInboundAccess({
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    kind,
+    groupPolicy,
+    storeAllowFrom,
+    readStoreAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+    eventKind: "native-command",
+    mayPair: true,
+  });
+  const denyReason = resolveMattermostCommandDenyReason({
+    decision: ingress.ingress,
+    kind,
+    dmPolicy: account.config.dmPolicy ?? "pairing",
+  });
+
+  if (denyReason) {
+    return {
+      ok: false,
+      denyReason,
+      commandAuthorized: false,
+      channelInfo,
+      kind,
+      chatType,
+      channelName,
+      channelDisplay,
+      roomLabel,
+    };
+  }
+
+  return {
+    ok: true,
+    commandAuthorized: ingress.commandAccess.authorized,
+    channelInfo,
+    kind,
+    chatType,
+    channelName,
+    channelDisplay,
+    roomLabel,
+  };
+}

extensions/mattermost/src/mattermost/monitor-gating.test.ts

@@ -0,0 +1,185 @@
+// Mattermost tests cover monitor gating plugin behavior.
+import { describe, expect, it, vi } from "vitest";
+import {
+  evaluateMattermostMentionGate,
+  mapMattermostChannelTypeToChatType,
+  resolveMattermostTrustedChatKind,
+} from "./monitor-gating.js";
+
+describe("mattermost monitor gating", () => {
+  it("maps mattermost channel types to chat types", () => {
+    expect(mapMattermostChannelTypeToChatType("D")).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("G")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType("P")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType("O")).toBe("channel");
+    expect(mapMattermostChannelTypeToChatType(undefined)).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType(null)).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("")).toBe("direct");
+  });
+
+  it("derives chat kind from trusted channel lookup before fallback state", () => {
+    expect(
+      resolveMattermostTrustedChatKind({
+        channelType: "O",
+        fallback: "direct",
+      }),
+    ).toBe("channel");
+    expect(
+      resolveMattermostTrustedChatKind({
+        channelType: "D",
+        fallback: "channel",
+      }),
+    ).toBe("direct");
+    expect(resolveMattermostTrustedChatKind({ fallback: "group" })).toBe("group");
+    expect(resolveMattermostTrustedChatKind({})).toBe("direct");
+  });
+
+  it("drops non-mentioned traffic when onchar is enabled but not triggered", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: true,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: false,
+      effectiveWasMentioned: false,
+      dropReason: "onchar-not-triggered",
+    });
+  });
+
+  it("processes engaged thread follow-ups without a mention", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        threadAlreadyEngaged: true,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: false,
+      effectiveWasMentioned: true,
+      dropReason: null,
+    });
+  });
+
+  it("engaged threads respond even when onchar is enabled but not triggered", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        threadAlreadyEngaged: true,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: true,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: false,
+      effectiveWasMentioned: true,
+      dropReason: null,
+    });
+  });
+
+  it("drops non-mentioned channel traffic outside an engaged thread", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        threadAlreadyEngaged: false,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: false,
+      effectiveWasMentioned: false,
+      dropReason: "missing-mention",
+    });
+  });
+
+  it("bypasses mention for authorized control commands and allows direct chats", () => {
+    const resolveRequireMention = vi.fn(() => true);
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "channel",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: true,
+        commandAuthorized: true,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: true,
+      shouldBypassMention: true,
+      effectiveWasMentioned: true,
+      dropReason: null,
+    });
+
+    expect(
+      evaluateMattermostMentionGate({
+        kind: "direct",
+        cfg: {} as never,
+        accountId: "default",
+        channelId: "chan-1",
+        resolveRequireMention,
+        wasMentioned: false,
+        isControlCommand: false,
+        commandAuthorized: false,
+        oncharEnabled: false,
+        oncharTriggered: false,
+        canDetectMention: true,
+      }),
+    ).toEqual({
+      shouldRequireMention: false,
+      shouldBypassMention: false,
+      effectiveWasMentioned: false,
+      dropReason: null,
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-gating.ts

@@ -0,0 +1,118 @@
+// Mattermost plugin module implements monitor gating behavior.
+import type { ChatType, OpenClawConfig } from "./runtime-api.js";
+
+export function mapMattermostChannelTypeToChatType(channelType?: string | null): ChatType {
+  const normalized = channelType?.trim().toUpperCase();
+  if (!normalized) {
+    return "direct";
+  }
+  if (normalized === "D") {
+    return "direct";
+  }
+  if (normalized === "G" || normalized === "P") {
+    return "group";
+  }
+  return "channel";
+}
+
+export function resolveMattermostTrustedChatKind(params: {
+  channelType?: string | null;
+  fallback?: ChatType;
+}): ChatType {
+  const channelType = params.channelType?.trim();
+  if (channelType) {
+    return mapMattermostChannelTypeToChatType(channelType);
+  }
+  return params.fallback ?? "direct";
+}
+
+export type MattermostRequireMentionResolverInput = {
+  cfg: OpenClawConfig;
+  channel: "mattermost";
+  accountId: string;
+  groupId: string;
+  requireMentionOverride?: boolean;
+};
+
+export type MattermostMentionGateInput = {
+  kind: ChatType;
+  cfg: OpenClawConfig;
+  accountId: string;
+  channelId: string;
+  threadRootId?: string;
+  requireMentionOverride?: boolean;
+  resolveRequireMention: (params: MattermostRequireMentionResolverInput) => boolean;
+  wasMentioned: boolean;
+  // Bot has already replied in this thread; treat follow-ups as addressed so the
+  // user need not re-mention on every turn (parity with Slack thread participation).
+  threadAlreadyEngaged?: boolean;
+  isControlCommand: boolean;
+  commandAuthorized: boolean;
+  oncharEnabled: boolean;
+  oncharTriggered: boolean;
+  canDetectMention: boolean;
+};
+
+type MattermostMentionGateDecision = {
+  shouldRequireMention: boolean;
+  shouldBypassMention: boolean;
+  effectiveWasMentioned: boolean;
+  dropReason: "onchar-not-triggered" | "missing-mention" | null;
+};
+
+export function evaluateMattermostMentionGate(
+  params: MattermostMentionGateInput,
+): MattermostMentionGateDecision {
+  const shouldRequireMention =
+    params.kind !== "direct" &&
+    params.resolveRequireMention({
+      cfg: params.cfg,
+      channel: "mattermost",
+      accountId: params.accountId,
+      groupId: params.channelId,
+      requireMentionOverride: params.requireMentionOverride,
+    });
+  const shouldBypassMention =
+    params.isControlCommand &&
+    shouldRequireMention &&
+    !params.wasMentioned &&
+    params.commandAuthorized;
+  const effectiveWasMentioned =
+    params.wasMentioned ||
+    shouldBypassMention ||
+    params.oncharTriggered ||
+    params.threadAlreadyEngaged === true;
+  if (
+    params.oncharEnabled &&
+    !params.oncharTriggered &&
+    !params.wasMentioned &&
+    !params.isControlCommand &&
+    params.threadAlreadyEngaged !== true
+  ) {
+    return {
+      shouldRequireMention,
+      shouldBypassMention,
+      effectiveWasMentioned,
+      dropReason: "onchar-not-triggered",
+    };
+  }
+  if (
+    params.kind !== "direct" &&
+    shouldRequireMention &&
+    params.canDetectMention &&
+    !effectiveWasMentioned
+  ) {
+    return {
+      shouldRequireMention,
+      shouldBypassMention,
+      effectiveWasMentioned,
+      dropReason: "missing-mention",
+    };
+  }
+  return {
+    shouldRequireMention,
+    shouldBypassMention,
+    effectiveWasMentioned,
+    dropReason: null,
+  };
+}

extensions/mattermost/src/mattermost/monitor-helpers.test.ts

@@ -0,0 +1,186 @@
+// Mattermost tests cover monitor helpers plugin behavior.
+import { describe, expect, it } from "vitest";
+import { normalizeMention, shouldDropEmptyMattermostBody } from "./monitor-helpers.js";
+
+describe("normalizeMention", () => {
+  it("returns trimmed text when no mention provided", () => {
+    expect(normalizeMention("  hello world  ", undefined)).toBe("hello world");
+  });
+
+  it("strips bot mention from text", () => {
+    expect(normalizeMention("@echobot hello", "echobot")).toBe("hello");
+  });
+
+  it("strips mention case-insensitively", () => {
+    expect(normalizeMention("@EchoBot hello", "echobot")).toBe("hello");
+  });
+
+  it("preserves newlines in multi-line messages", () => {
+    const input = "@echobot\nline1\nline2\nline3";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("line1\nline2\nline3");
+  });
+
+  it("preserves Markdown headings", () => {
+    const input = "@echobot\n# Heading\n\nSome text";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("# Heading");
+    expect(result).toContain("\n");
+  });
+
+  it("preserves Markdown blockquotes", () => {
+    const input = "@echobot\n> quoted line\n> second line";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("> quoted line");
+    expect(result).toContain("> second line");
+  });
+
+  it("preserves Markdown lists", () => {
+    const input = "@echobot\n- item A\n- item B\n  - sub B1";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("- item A");
+    expect(result).toContain("- item B");
+  });
+
+  it("preserves task lists", () => {
+    const input = "@echobot\n- [ ] todo\n- [x] done";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("- [ ] todo");
+    expect(result).toContain("- [x] done");
+  });
+
+  it("handles mention in middle of text", () => {
+    const input = "hey @echobot check this\nout";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("hey check this\nout");
+  });
+
+  it("preserves leading indentation for nested lists", () => {
+    const input = "@echobot\n- item\n  - nested\n    - deep";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("  - nested");
+    expect(result).toContain("    - deep");
+  });
+
+  it("preserves first-line indentation for nested list items", () => {
+    const input = "@echobot\n  - nested\n    - deep";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("  - nested\n    - deep");
+  });
+
+  it("preserves indented code blocks", () => {
+    const input = "@echobot\ntext\n    code line 1\n    code line 2";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toContain("    code line 1");
+    expect(result).toContain("    code line 2");
+  });
+
+  it("preserves first-line indentation for indented code blocks", () => {
+    const input = "@echobot\n    code line 1\n    code line 2";
+    const result = normalizeMention(input, "echobot");
+    expect(result).toBe("    code line 1\n    code line 2");
+  });
+});
+
+describe("shouldDropEmptyMattermostBody", () => {
+  it("drops a non-mention message that normalizes to an empty body", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText: "   ",
+        botUsername: "openclaw",
+      }),
+    ).toBe(true);
+  });
+
+  it("keeps a message that still has body text", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "hello",
+        rawText: "hello",
+        botUsername: "openclaw",
+      }),
+    ).toBe(false);
+  });
+
+  it("keeps a bare mention in a group", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText: "@openclaw",
+        botUsername: "openclaw",
+      }),
+    ).toBe(false);
+  });
+
+  it("keeps a bare mention in a direct message", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText: "@OpenClaw",
+        botUsername: "openclaw",
+      }),
+    ).toBe(false);
+  });
+
+  it("drops an empty body when the bot username is unknown", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText: "@someoneelse",
+        botUsername: undefined,
+      }),
+    ).toBe(true);
+  });
+
+  it("drops a blank post even when a generic mention pattern matched it", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText: "",
+        botUsername: "openclaw",
+      }),
+    ).toBe(true);
+  });
+
+  it("drops a bot mention with only a Unicode control residual", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "\u0085",
+        rawText: "@openclaw\u0085",
+        botUsername: "openclaw",
+      }),
+    ).toBe(true);
+  });
+
+  it("drops a bot mention with only a combining-mark residual", () => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "\ufe0f",
+        rawText: "@openclaw\ufe0f",
+        botUsername: "openclaw",
+      }),
+    ).toBe(true);
+  });
+
+  it.each([
+    "@openclaw @openclaw",
+    "@openclaw\n@openclaw",
+    "@openclaw\n",
+    "\n@openclaw",
+    "@openclaw\r\n",
+    "@openclaw\u2028",
+    "@openclaw\u2029",
+    "\v@openclaw\f",
+    "@openclaw\u00a0",
+    "\u2003@openclaw",
+  ])("drops an invalid empty-body candidate: %j", (rawText) => {
+    expect(
+      shouldDropEmptyMattermostBody({
+        bodyText: "",
+        rawText,
+        botUsername: "openclaw",
+      }),
+    ).toBe(true);
+  });
+});

extensions/mattermost/src/mattermost/monitor-helpers.ts

@@ -0,0 +1,69 @@
+// Mattermost helper module supports monitor helpers behavior.
+import { formatInboundFromLabel as formatInboundFromLabelShared } from "openclaw/plugin-sdk/channel-inbound";
+import { resolveThreadSessionKeys as resolveThreadSessionKeysShared } from "openclaw/plugin-sdk/routing";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { rawDataToString } from "openclaw/plugin-sdk/webhook-ingress";
+
+export { rawDataToString };
+
+export const formatInboundFromLabel = formatInboundFromLabelShared;
+
+export function resolveThreadSessionKeys(params: {
+  baseSessionKey: string;
+  threadId?: string | null;
+  parentSessionKey?: string;
+  useSuffix?: boolean;
+}): { sessionKey: string; parentSessionKey?: string } {
+  return resolveThreadSessionKeysShared({
+    ...params,
+    normalizeThreadId: (threadId) => threadId,
+  });
+}
+
+/**
+ * Strip bot mention from message text while preserving newlines and
+ * block-level Markdown formatting (headings, lists, blockquotes).
+ */
+export function normalizeMention(text: string, mention: string | undefined): string {
+  if (!mention) {
+    return text.trim();
+  }
+  const escaped = mention.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  const hasMentionRe = new RegExp(`@${escaped}\\b`, "i");
+  const leadingMentionRe = new RegExp(`^([\\t ]*)@${escaped}\\b[\\t ]*`, "i");
+  const trailingMentionRe = new RegExp(`[\\t ]*@${escaped}\\b[\\t ]*$`, "i");
+  const normalizedLines = text.split("\n").map((line) => {
+    const hadMention = hasMentionRe.test(line);
+    const normalizedLine = line
+      .replace(leadingMentionRe, "$1")
+      .replace(trailingMentionRe, "")
+      .replace(new RegExp(`@${escaped}\\b`, "gi"), "")
+      .replace(/(\S)[ \t]{2,}/g, "$1 ");
+    return {
+      text: normalizedLine,
+      mentionOnlyBlank: hadMention && normalizedLine.trim() === "",
+    };
+  });
+
+  while (normalizedLines[0]?.mentionOnlyBlank) {
+    normalizedLines.shift();
+  }
+  while (normalizedLines.at(-1)?.text.trim() === "") {
+    normalizedLines.pop();
+  }
+
+  return normalizedLines.map((line) => line.text).join("\n");
+}
+
+export function shouldDropEmptyMattermostBody(params: {
+  bodyText: string;
+  rawText: string;
+  botUsername?: string | null;
+}): boolean {
+  if (/[^\p{White_Space}\p{Cc}\p{Cf}\p{M}]/u.test(params.bodyText)) {
+    return false;
+  }
+  const botUsername = normalizeLowercaseStringOrEmpty(params.botUsername ?? "");
+  const bareMention = params.rawText.match(/^[ \t]*(@\S+)[ \t]*$/u)?.[1];
+  return !botUsername || normalizeLowercaseStringOrEmpty(bareMention ?? "") !== `@${botUsername}`;
+}

extensions/mattermost/src/mattermost/monitor-onchar.test.ts

@@ -0,0 +1,33 @@
+// Mattermost tests cover monitor onchar plugin behavior.
+import { describe, expect, it } from "vitest";
+import { resolveOncharPrefixes, stripOncharPrefix } from "./monitor-onchar.js";
+
+describe("mattermost monitor onchar", () => {
+  it("uses defaults when prefixes are missing or empty after trimming", () => {
+    expect(resolveOncharPrefixes(undefined)).toEqual([">", "!"]);
+    expect(resolveOncharPrefixes([" ", ""])).toEqual([">", "!"]);
+  });
+
+  it("trims configured prefixes and preserves order", () => {
+    expect(resolveOncharPrefixes(["  ?? ", " !", " /bot "])).toEqual(["??", "!", "/bot"]);
+  });
+
+  it("strips the first matching prefix after leading whitespace", () => {
+    expect(stripOncharPrefix("   ! hello world", ["!", ">"])).toEqual({
+      triggered: true,
+      stripped: "hello world",
+    });
+
+    expect(stripOncharPrefix("??multi prefix", ["??", "?"])).toEqual({
+      triggered: true,
+      stripped: "multi prefix",
+    });
+  });
+
+  it("returns the original text when no prefix matches", () => {
+    expect(stripOncharPrefix("hello world", ["!", ">"])).toEqual({
+      triggered: false,
+      stripped: "hello world",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-onchar.ts

@@ -0,0 +1,28 @@
+// Mattermost plugin module implements monitor onchar behavior.
+import { normalizeStringEntries } from "openclaw/plugin-sdk/string-coerce-runtime";
+
+const DEFAULT_ONCHAR_PREFIXES = [">", "!"];
+
+export function resolveOncharPrefixes(prefixes: string[] | undefined): string[] {
+  const cleaned = prefixes ? normalizeStringEntries(prefixes) : DEFAULT_ONCHAR_PREFIXES;
+  return cleaned.length > 0 ? cleaned : DEFAULT_ONCHAR_PREFIXES;
+}
+
+export function stripOncharPrefix(
+  text: string,
+  prefixes: string[],
+): { triggered: boolean; stripped: string } {
+  const trimmed = text.trimStart();
+  for (const prefix of prefixes) {
+    if (!prefix) {
+      continue;
+    }
+    if (trimmed.startsWith(prefix)) {
+      return {
+        triggered: true,
+        stripped: trimmed.slice(prefix.length).trimStart(),
+      };
+    }
+  }
+  return { triggered: false, stripped: text };
+}

extensions/mattermost/src/mattermost/monitor-resources.test.ts

@@ -0,0 +1,235 @@
+// Mattermost tests cover monitor resources plugin behavior.
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const fetchMattermostChannel = vi.hoisted(() => vi.fn());
+const fetchMattermostUser = vi.hoisted(() => vi.fn());
+const sendMattermostTyping = vi.hoisted(() => vi.fn());
+const updateMattermostPost = vi.hoisted(() => vi.fn());
+const buildButtonProps = vi.hoisted(() => vi.fn());
+
+vi.mock("./client.js", () => ({
+  fetchMattermostChannel,
+  fetchMattermostUser,
+  sendMattermostTyping,
+  updateMattermostPost,
+}));
+
+vi.mock("./interactions.js", () => ({
+  buildButtonProps,
+}));
+
+describe("mattermost monitor resources", () => {
+  let createMattermostMonitorResources: typeof import("./monitor-resources.js").createMattermostMonitorResources;
+  let formatMattermostInboundMediaText: typeof import("./monitor-resources.js").formatMattermostInboundMediaText;
+
+  beforeAll(async () => {
+    ({ createMattermostMonitorResources, formatMattermostInboundMediaText } =
+      await import("./monitor-resources.js"));
+  });
+
+  it("keeps media-only download failures visible to the agent", () => {
+    expect(
+      formatMattermostInboundMediaText({
+        body: "",
+        mediaPlaceholder: "",
+        expectedCount: 1,
+        mediaCount: 0,
+      }),
+    ).toBe("[mattermost attachment unavailable]");
+  });
+
+  it("preserves successful media placeholders on partial failures", () => {
+    expect(
+      formatMattermostInboundMediaText({
+        body: "<media:document> (2 files)",
+        mediaPlaceholder: "<media:document> (2 files)",
+        expectedCount: 2,
+        mediaCount: 1,
+      }),
+    ).toBe("<media:document> (2 files)\n\n[mattermost attachment unavailable]");
+  });
+
+  beforeEach(() => {
+    fetchMattermostChannel.mockReset();
+    fetchMattermostUser.mockReset();
+    sendMattermostTyping.mockReset();
+    updateMattermostPost.mockReset();
+    buildButtonProps.mockReset();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("downloads media, preserves auth headers, and infers media kind", async () => {
+    const saveRemoteMedia = vi.fn(async () => ({
+      path: "/tmp/file.png",
+      contentType: "image/png",
+    }));
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {
+        apiBaseUrl: "https://chat.example.com/api/v4",
+        baseUrl: "https://chat.example.com",
+        token: "bot-token",
+      } as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      saveRemoteMedia,
+      mediaKindFromMime: () => "image",
+    });
+
+    await expect(resources.resolveMattermostMedia([" file-1 "])).resolves.toEqual([
+      {
+        path: "/tmp/file.png",
+        contentType: "image/png",
+        kind: "image",
+      },
+    ]);
+
+    expect(saveRemoteMedia).toHaveBeenCalledWith({
+      url: "https://chat.example.com/api/v4/files/file-1",
+      requestInit: {
+        headers: {
+          Authorization: "Bearer bot-token",
+        },
+      },
+      filePathHint: "file-1",
+      maxBytes: 1024,
+      ssrfPolicy: { allowedHostnames: ["chat.example.com"] },
+    });
+  });
+
+  it("caches channel and user lookups and falls back to empty picker props", async () => {
+    fetchMattermostChannel.mockResolvedValue({ id: "chan-1", name: "town-square" });
+    fetchMattermostUser.mockResolvedValue({ id: "user-1", username: "alice" });
+    buildButtonProps.mockReturnValue(undefined);
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {} as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      saveRemoteMedia: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "town-square",
+    });
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "town-square",
+    });
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "alice",
+    });
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "alice",
+    });
+
+    expect(fetchMattermostChannel).toHaveBeenCalledTimes(1);
+    expect(fetchMattermostUser).toHaveBeenCalledTimes(1);
+
+    await resources.updateModelPickerPost({
+      channelId: "chan-1",
+      postId: "post-1",
+      message: "Pick a model",
+    });
+
+    expect(updateMattermostPost).toHaveBeenCalledWith({}, "post-1", {
+      message: "Pick a model",
+      props: { attachments: [] },
+    });
+  });
+
+  it("does not reuse cached lookups while the process clock is invalid", async () => {
+    fetchMattermostChannel
+      .mockResolvedValueOnce({ id: "chan-1", name: "old" })
+      .mockResolvedValueOnce({ id: "chan-1", name: "fresh" })
+      .mockResolvedValueOnce({ id: "chan-1", name: "recovered" });
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {} as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      saveRemoteMedia: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "old",
+    });
+
+    vi.spyOn(Date, "now").mockReturnValue(8_640_000_000_000_001);
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "fresh",
+    });
+
+    vi.mocked(Date.now).mockReturnValue(1_000);
+    await expect(resources.resolveChannelInfo("chan-1")).resolves.toEqual({
+      id: "chan-1",
+      name: "recovered",
+    });
+
+    expect(fetchMattermostChannel).toHaveBeenCalledTimes(3);
+  });
+
+  it("does not cache lookups when cache expiry would exceed the Date range", async () => {
+    vi.spyOn(Date, "now").mockReturnValue(8_640_000_000_000_000);
+    fetchMattermostUser
+      .mockResolvedValueOnce({ id: "user-1", username: "first" })
+      .mockResolvedValueOnce({ id: "user-1", username: "second" });
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client: {} as never,
+      logger: {},
+      mediaMaxBytes: 1024,
+      saveRemoteMedia: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "first",
+    });
+    await expect(resources.resolveUserInfo("user-1")).resolves.toEqual({
+      id: "user-1",
+      username: "second",
+    });
+
+    expect(fetchMattermostUser).toHaveBeenCalledTimes(2);
+  });
+
+  it("proxies typing indicators to the mattermost client helper", async () => {
+    const client = {} as never;
+
+    const resources = createMattermostMonitorResources({
+      accountId: "default",
+      callbackUrl: "https://openclaw.test/callback",
+      client,
+      logger: {},
+      mediaMaxBytes: 1024,
+      saveRemoteMedia: vi.fn(),
+      mediaKindFromMime: () => "document",
+    });
+
+    await resources.sendTypingIndicator("chan-1", "root-1");
+    expect(sendMattermostTyping).toHaveBeenCalledWith(client, {
+      channelId: "chan-1",
+      parentId: "root-1",
+    });
+  });
+});

extensions/mattermost/src/mattermost/monitor-resources.ts

@@ -0,0 +1,211 @@
+// Mattermost plugin module implements monitor resources behavior.
+import { formatInboundMediaUnavailableText } from "openclaw/plugin-sdk/channel-inbound";
+import {
+  asDateTimestampMs,
+  resolveExpiresAtMsFromDurationMs,
+} from "openclaw/plugin-sdk/number-runtime";
+import { normalizeStringEntries } from "openclaw/plugin-sdk/string-coerce-runtime";
+import {
+  fetchMattermostChannel,
+  fetchMattermostUser,
+  sendMattermostTyping,
+  updateMattermostPost,
+  type MattermostChannel,
+  type MattermostClient,
+  type MattermostUser,
+} from "./client.js";
+import { buildButtonProps, type MattermostInteractionResponse } from "./interactions.js";
+
+export type MattermostMediaKind = "image" | "audio" | "video" | "document" | "unknown";
+
+export type MattermostMediaInfo = {
+  path: string;
+  contentType?: string;
+  kind: MattermostMediaKind;
+};
+
+export function formatMattermostInboundMediaText(params: {
+  body: string;
+  mediaPlaceholder: string;
+  expectedCount: number;
+  mediaCount: number;
+}): string {
+  const unavailableCount = Math.max(0, params.expectedCount - params.mediaCount);
+  if (unavailableCount === 0) {
+    return params.body;
+  }
+  return formatInboundMediaUnavailableText({
+    body: params.body,
+    mediaPlaceholder: params.mediaCount === 0 ? params.mediaPlaceholder : undefined,
+    notice: `[mattermost ${unavailableCount > 1 ? `${unavailableCount} attachments` : "attachment"} unavailable]`,
+  });
+}
+
+const CHANNEL_CACHE_TTL_MS = 5 * 60_000;
+const USER_CACHE_TTL_MS = 10 * 60_000;
+
+type SaveRemoteMedia = (params: {
+  url: string;
+  requestInit?: RequestInit;
+  filePathHint?: string;
+  maxBytes: number;
+  ssrfPolicy?: { allowedHostnames?: string[] };
+}) => Promise<{ path: string; contentType?: string | null }>;
+
+export function createMattermostMonitorResources(params: {
+  accountId: string;
+  callbackUrl: string;
+  client: MattermostClient;
+  logger: { debug?: (...args: unknown[]) => void };
+  mediaMaxBytes: number;
+  saveRemoteMedia: SaveRemoteMedia;
+  mediaKindFromMime: (contentType?: string) => MattermostMediaKind | null | undefined;
+}) {
+  const {
+    accountId,
+    callbackUrl,
+    client,
+    logger,
+    mediaMaxBytes,
+    saveRemoteMedia,
+    mediaKindFromMime,
+  } = params;
+  const channelCache = new Map<string, { value: MattermostChannel | null; expiresAt: number }>();
+  const userCache = new Map<string, { value: MattermostUser | null; expiresAt: number }>();
+
+  const getCachedValue = <T>(
+    cache: Map<string, { value: T | null; expiresAt: number }>,
+    key: string,
+    nowMs: number | undefined,
+  ): T | null | undefined => {
+    const cached = cache.get(key);
+    if (!cached) {
+      return undefined;
+    }
+    if (nowMs !== undefined && cached.expiresAt > nowMs) {
+      return cached.value;
+    }
+    cache.delete(key);
+    return undefined;
+  };
+
+  const setCachedValue = <T>(
+    cache: Map<string, { value: T | null; expiresAt: number }>,
+    key: string,
+    value: T | null,
+    ttlMs: number,
+    rawNowMs: number,
+  ): void => {
+    const expiresAt = resolveExpiresAtMsFromDurationMs(ttlMs, { nowMs: rawNowMs });
+    if (expiresAt !== undefined) {
+      cache.set(key, { value, expiresAt });
+    }
+  };
+
+  const resolveMattermostMedia = async (
+    fileIds?: string[] | null,
+  ): Promise<MattermostMediaInfo[]> => {
+    const ids = normalizeStringEntries(fileIds ?? []);
+    if (ids.length === 0) {
+      return [];
+    }
+    const out: MattermostMediaInfo[] = [];
+    for (const fileId of ids) {
+      try {
+        const saved = await saveRemoteMedia({
+          url: `${client.apiBaseUrl}/files/${fileId}`,
+          requestInit: {
+            headers: {
+              Authorization: `Bearer ${client.token}`,
+            },
+          },
+          filePathHint: fileId,
+          maxBytes: mediaMaxBytes,
+          ssrfPolicy: { allowedHostnames: [new URL(client.baseUrl).hostname] },
+        });
+        const contentType = saved.contentType ?? undefined;
+        out.push({
+          path: saved.path,
+          contentType,
+          kind: mediaKindFromMime(contentType) ?? "unknown",
+        });
+      } catch (err) {
+        logger.debug?.(`mattermost: failed to download file ${fileId}: ${String(err)}`);
+      }
+    }
+    return out;
+  };
+
+  const sendTypingIndicator = async (channelId: string, parentId?: string) => {
+    await sendMattermostTyping(client, { channelId, parentId });
+  };
+
+  const resolveChannelInfo = async (channelId: string): Promise<MattermostChannel | null> => {
+    const rawNow = Date.now();
+    const cached = getCachedValue(channelCache, channelId, asDateTimestampMs(rawNow));
+    if (cached !== undefined) {
+      return cached;
+    }
+    try {
+      const info = await fetchMattermostChannel(client, channelId);
+      setCachedValue(channelCache, channelId, info, CHANNEL_CACHE_TTL_MS, rawNow);
+      return info;
+    } catch (err) {
+      logger.debug?.(`mattermost: channel lookup failed: ${String(err)}`);
+      setCachedValue(channelCache, channelId, null, CHANNEL_CACHE_TTL_MS, rawNow);
+      return null;
+    }
+  };
+
+  const resolveUserInfo = async (userId: string): Promise<MattermostUser | null> => {
+    const rawNow = Date.now();
+    const cached = getCachedValue(userCache, userId, asDateTimestampMs(rawNow));
+    if (cached !== undefined) {
+      return cached;
+    }
+    try {
+      const info = await fetchMattermostUser(client, userId);
+      setCachedValue(userCache, userId, info, USER_CACHE_TTL_MS, rawNow);
+      return info;
+    } catch (err) {
+      logger.debug?.(`mattermost: user lookup failed: ${String(err)}`);
+      setCachedValue(userCache, userId, null, USER_CACHE_TTL_MS, rawNow);
+      return null;
+    }
+  };
+
+  const buildModelPickerProps = (
+    channelId: string,
+    buttons: Array<unknown>,
+  ): Record<string, unknown> | undefined =>
+    buildButtonProps({
+      callbackUrl,
+      accountId,
+      channelId,
+      buttons,
+    });
+
+  const updateModelPickerPost = async (paramsLocal: {
+    channelId: string;
+    postId: string;
+    message: string;
+    buttons?: Array<unknown>;
+  }): Promise<MattermostInteractionResponse> => {
+    const props = buildModelPickerProps(paramsLocal.channelId, paramsLocal.buttons ?? []) ?? {
+      attachments: [],
+    };
+    await updateMattermostPost(client, paramsLocal.postId, {
+      message: paramsLocal.message,
+      props,
+    });
+    return {};
+  };
+
+  return {
+    resolveMattermostMedia,
+    sendTypingIndicator,
+    resolveChannelInfo,
+    resolveUserInfo,
+    updateModelPickerPost,
+  };
+}

extensions/mattermost/src/mattermost/monitor-slash.test.ts

@@ -0,0 +1,227 @@
+// Mattermost tests cover monitor slash plugin behavior.
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const listSkillCommandsForAgents = vi.hoisted(() => vi.fn());
+const parseTcpPort = vi.hoisted(() => vi.fn());
+const fetchMattermostUserTeams = vi.hoisted(() => vi.fn());
+const normalizeMattermostBaseUrl = vi.hoisted(() => vi.fn((value: string | undefined) => value));
+const isSlashCommandsEnabled = vi.hoisted(() => vi.fn());
+const registerSlashCommands = vi.hoisted(() => vi.fn());
+const resolveCallbackUrl = vi.hoisted(() => vi.fn());
+const resolveSlashCommandConfig = vi.hoisted(() => vi.fn());
+const activateSlashCommands = vi.hoisted(() => vi.fn());
+
+vi.mock("./runtime-api.js", () => ({
+  listSkillCommandsForAgents,
+  parseTcpPort,
+}));
+
+vi.mock("./client.js", async () => {
+  const actual = await vi.importActual<typeof import("./client.js")>("./client.js");
+  return {
+    ...actual,
+    fetchMattermostUserTeams,
+    normalizeMattermostBaseUrl,
+  };
+});
+
+vi.mock("./slash-commands.js", () => ({
+  DEFAULT_COMMAND_SPECS: [
+    { trigger: "ping", description: "ping" },
+    { trigger: "ping", description: "duplicate" },
+  ],
+  isSlashCommandsEnabled,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveSlashCommandConfig,
+}));
+
+vi.mock("./slash-state.js", () => ({
+  activateSlashCommands,
+}));
+
+function requireFirstMockCall<TArgs extends unknown[]>(
+  mock: { mock: { calls: TArgs[] } },
+  label: string,
+): TArgs {
+  const [call] = mock.mock.calls;
+  if (!call) {
+    throw new Error(`expected ${label}`);
+  }
+  return call;
+}
+
+describe("mattermost monitor slash", () => {
+  let registerMattermostMonitorSlashCommands: typeof import("./monitor-slash.js").registerMattermostMonitorSlashCommands;
+
+  beforeAll(async () => {
+    ({ registerMattermostMonitorSlashCommands } = await import("./monitor-slash.js"));
+  });
+
+  beforeEach(() => {
+    listSkillCommandsForAgents.mockReset();
+    parseTcpPort.mockReset();
+    fetchMattermostUserTeams.mockReset();
+    normalizeMattermostBaseUrl.mockClear();
+    isSlashCommandsEnabled.mockReset();
+    registerSlashCommands.mockReset();
+    resolveCallbackUrl.mockReset();
+    resolveSlashCommandConfig.mockReset();
+    activateSlashCommands.mockReset();
+  });
+
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("returns early when slash commands are disabled", async () => {
+    resolveSlashCommandConfig.mockReturnValue({ enabled: false });
+    isSlashCommandsEnabled.mockReturnValue(false);
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: {} as never,
+      runtime: {} as never,
+      account: { config: {} } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(fetchMattermostUserTeams).not.toHaveBeenCalled();
+    expect(activateSlashCommands).not.toHaveBeenCalled();
+  });
+
+  it("registers deduped default and native skill commands across teams", async () => {
+    vi.stubEnv("OPENCLAW_GATEWAY_PORT", "18888");
+    resolveSlashCommandConfig.mockReturnValue({ enabled: true, nativeSkills: true });
+    isSlashCommandsEnabled.mockReturnValue(true);
+    parseTcpPort.mockReturnValue(18888);
+    fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }, { id: "team-2" }]);
+    resolveCallbackUrl.mockReturnValue("https://openclaw.test/slash");
+    listSkillCommandsForAgents.mockReturnValue([
+      { name: "skill", description: "Skill run" },
+      { name: "oc_ping", description: "Already prefixed" },
+      { name: "   ", description: "ignored" },
+    ]);
+    registerSlashCommands
+      .mockResolvedValueOnce([{ token: "token-1", trigger: "ping" }])
+      .mockResolvedValueOnce([{ token: "token-2", trigger: "oc_skill" }]);
+    const client = {} as never;
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    };
+
+    await registerMattermostMonitorSlashCommands({
+      client,
+      cfg: { gateway: { port: 18789 } } as never,
+      runtime: runtime as never,
+      account: { config: { commands: {} }, accountId: "default" } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(registerSlashCommands).toHaveBeenCalledTimes(2);
+    const [firstRegistration] = requireFirstMockCall(
+      registerSlashCommands,
+      "first Mattermost slash command registration",
+    );
+    expect(firstRegistration).toEqual({
+      client,
+      teamId: "team-1",
+      creatorUserId: "bot-user",
+      callbackUrl: "https://openclaw.test/slash",
+      commands: [
+        { trigger: "ping", description: "ping" },
+        {
+          trigger: "oc_skill",
+          description: "Skill run",
+          autoComplete: true,
+          autoCompleteHint: "[args]",
+          originalName: "skill",
+        },
+        {
+          trigger: "oc_ping",
+          description: "Already prefixed",
+          autoComplete: true,
+          autoCompleteHint: "[args]",
+          originalName: "oc_ping",
+        },
+      ],
+      log: firstRegistration.log,
+    });
+    expect(typeof firstRegistration.log).toBe("function");
+    const [activation] = requireFirstMockCall(
+      activateSlashCommands,
+      "Mattermost slash command activation",
+    );
+    expect(activation?.commandTokens).toStrictEqual(["token-1", "token-2"]);
+    expect(activation?.triggerMap).toStrictEqual(
+      new Map([
+        ["oc_skill", "skill"],
+        ["oc_ping", "oc_ping"],
+      ]),
+    );
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: slash commands registered (2 commands across 2 teams, callback=https://openclaw.test/slash)",
+    );
+  });
+
+  it("falls back to the configured gateway port when the env port is out of range", async () => {
+    vi.stubEnv("OPENCLAW_GATEWAY_PORT", "65536");
+    resolveSlashCommandConfig.mockReturnValue({ enabled: true, nativeSkills: false });
+    isSlashCommandsEnabled.mockReturnValue(true);
+    parseTcpPort.mockReturnValue(null);
+    fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }]);
+    resolveCallbackUrl.mockReturnValue("https://openclaw.test/slash");
+    registerSlashCommands.mockResolvedValue([{ token: "token-1", trigger: "ping" }]);
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: { gateway: { port: 18789 } } as never,
+      runtime: { log: vi.fn(), error: vi.fn() } as never,
+      account: { config: { commands: {} }, accountId: "default" } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(parseTcpPort).toHaveBeenCalledWith("65536");
+    expect(resolveCallbackUrl).toHaveBeenCalledWith(
+      expect.objectContaining({ gatewayPort: 18789 }),
+    );
+  });
+
+  it("warns on loopback callback urls and reports partial team failures", async () => {
+    resolveSlashCommandConfig.mockReturnValue({ enabled: true, nativeSkills: false });
+    isSlashCommandsEnabled.mockReturnValue(true);
+    parseTcpPort.mockReturnValue(null);
+    fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }, { id: "team-2" }]);
+    resolveCallbackUrl.mockReturnValue("http://127.0.0.1:18789/slash");
+    registerSlashCommands
+      .mockResolvedValueOnce([{ token: "token-1", trigger: "ping" }])
+      .mockRejectedValueOnce(new Error("boom"));
+    const runtime = {
+      log: vi.fn(),
+      error: vi.fn(),
+    };
+
+    await registerMattermostMonitorSlashCommands({
+      client: {} as never,
+      cfg: { gateway: { customBindHost: "loopback" } } as never,
+      runtime: runtime as never,
+      account: { config: { commands: {} }, accountId: "default" } as never,
+      baseUrl: "https://chat.example.com",
+      botUserId: "bot-user",
+    });
+
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: slash commands callbackUrl resolved to http://127.0.0.1:18789/slash (loopback) while baseUrl is https://chat.example.com. This MAY be unreachable depending on your deployment. If native slash commands don't work, set channels.mattermost.commands.callbackUrl to a URL reachable from the Mattermost server (e.g. your public reverse proxy URL).",
+    );
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: failed to register slash commands for team team-2: Error: boom",
+    );
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: slash command registration completed with 1 team error(s)",
+    );
+  });
+});

extensions/mattermost/src/mattermost/monitor-slash.ts

@@ -0,0 +1,211 @@
+// Mattermost plugin module implements monitor slash behavior.
+import { isLoopbackHost } from "openclaw/plugin-sdk/gateway-runtime";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  fetchMattermostUserTeams,
+  normalizeMattermostBaseUrl,
+  type MattermostClient,
+} from "./client.js";
+import {
+  listSkillCommandsForAgents,
+  parseTcpPort,
+  type OpenClawConfig,
+  type RuntimeEnv,
+} from "./runtime-api.js";
+import {
+  DEFAULT_COMMAND_SPECS,
+  isSlashCommandsEnabled,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveSlashCommandConfig,
+  type MattermostCommandSpec,
+  type MattermostRegisteredCommand,
+  type MattermostSlashCommandConfig,
+} from "./slash-commands.js";
+import { activateSlashCommands } from "./slash-state.js";
+
+function buildSlashCommands(params: {
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  nativeSkills: boolean;
+}): MattermostCommandSpec[] {
+  const commandsToRegister: MattermostCommandSpec[] = [...DEFAULT_COMMAND_SPECS];
+  if (!params.nativeSkills) {
+    return commandsToRegister;
+  }
+  try {
+    const skillCommands = listSkillCommandsForAgents({ cfg: params.cfg });
+    for (const spec of skillCommands) {
+      const name = typeof spec.name === "string" ? spec.name.trim() : "";
+      if (!name) {
+        continue;
+      }
+      const trigger = name.startsWith("oc_") ? name : `oc_${name}`;
+      commandsToRegister.push({
+        trigger,
+        description: spec.description || `Run skill ${name}`,
+        autoComplete: true,
+        autoCompleteHint: "[args]",
+        originalName: name,
+      });
+    }
+  } catch (err) {
+    params.runtime.error?.(`mattermost: failed to list skill commands: ${String(err)}`);
+  }
+  return commandsToRegister;
+}
+
+function dedupeSlashCommands(commands: MattermostCommandSpec[]): MattermostCommandSpec[] {
+  const seen = new Set<string>();
+  return commands.filter((cmd) => {
+    const key = cmd.trigger.trim();
+    if (!key || seen.has(key)) {
+      return false;
+    }
+    seen.add(key);
+    return true;
+  });
+}
+
+function buildTriggerMap(commands: MattermostCommandSpec[]): Map<string, string> {
+  const triggerMap = new Map<string, string>();
+  for (const cmd of commands) {
+    if (cmd.originalName) {
+      triggerMap.set(cmd.trigger, cmd.originalName);
+    }
+  }
+  return triggerMap;
+}
+
+function warnOnSuspiciousCallbackUrl(params: {
+  runtime: RuntimeEnv;
+  baseUrl: string;
+  callbackUrl: string;
+}) {
+  try {
+    const mmHost = new URL(normalizeMattermostBaseUrl(params.baseUrl) ?? params.baseUrl).hostname;
+    const callbackHost = new URL(params.callbackUrl).hostname;
+
+    if (isLoopbackHost(callbackHost) && !isLoopbackHost(mmHost)) {
+      params.runtime.error?.(
+        `mattermost: slash commands callbackUrl resolved to ${params.callbackUrl} (loopback) while baseUrl is ${params.baseUrl}. This MAY be unreachable depending on your deployment. If native slash commands don't work, set channels.mattermost.commands.callbackUrl to a URL reachable from the Mattermost server (e.g. your public reverse proxy URL).`,
+      );
+    }
+  } catch {
+    // Ignore malformed URLs and let the downstream registration fail naturally.
+  }
+}
+
+async function registerSlashCommandsAcrossTeams(params: {
+  client: MattermostClient;
+  teams: Array<{ id: string }>;
+  botUserId: string;
+  callbackUrl: string;
+  commands: MattermostCommandSpec[];
+  runtime: RuntimeEnv;
+}): Promise<{
+  registered: MattermostRegisteredCommand[];
+  teamRegistrationFailures: number;
+}> {
+  const registered: MattermostRegisteredCommand[] = [];
+  let teamRegistrationFailures = 0;
+
+  for (const team of params.teams) {
+    try {
+      const created = await registerSlashCommands({
+        client: params.client,
+        teamId: team.id,
+        creatorUserId: params.botUserId,
+        callbackUrl: params.callbackUrl,
+        commands: params.commands,
+        log: (msg) => params.runtime.log?.(msg),
+      });
+      registered.push(...created);
+    } catch (err) {
+      teamRegistrationFailures += 1;
+      params.runtime.error?.(
+        `mattermost: failed to register slash commands for team ${team.id}: ${String(err)}`,
+      );
+    }
+  }
+
+  return { registered, teamRegistrationFailures };
+}
+
+export async function registerMattermostMonitorSlashCommands(params: {
+  client: MattermostClient;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  account: ResolvedMattermostAccount;
+  baseUrl: string;
+  botUserId: string;
+}) {
+  const commandsRaw = params.account.config.commands as
+    | Partial<MattermostSlashCommandConfig>
+    | undefined;
+  const slashConfig = resolveSlashCommandConfig(commandsRaw);
+  if (!isSlashCommandsEnabled(slashConfig)) {
+    return;
+  }
+
+  try {
+    const teams = await fetchMattermostUserTeams(params.client, params.botUserId);
+    const envPort = parseTcpPort(process.env.OPENCLAW_GATEWAY_PORT);
+    const slashGatewayPort = envPort ?? params.cfg.gateway?.port ?? 18789;
+    const slashCallbackUrl = resolveCallbackUrl({
+      config: slashConfig,
+      gatewayPort: slashGatewayPort,
+      gatewayHost: params.cfg.gateway?.customBindHost ?? undefined,
+    });
+
+    warnOnSuspiciousCallbackUrl({
+      runtime: params.runtime,
+      baseUrl: params.baseUrl,
+      callbackUrl: slashCallbackUrl,
+    });
+
+    const dedupedCommands = dedupeSlashCommands(
+      buildSlashCommands({
+        cfg: params.cfg,
+        runtime: params.runtime,
+        nativeSkills: slashConfig.nativeSkills === true,
+      }),
+    );
+    const { registered, teamRegistrationFailures } = await registerSlashCommandsAcrossTeams({
+      client: params.client,
+      teams,
+      botUserId: params.botUserId,
+      callbackUrl: slashCallbackUrl,
+      commands: dedupedCommands,
+      runtime: params.runtime,
+    });
+
+    if (registered.length === 0) {
+      params.runtime.error?.(
+        "mattermost: native slash commands enabled but no commands could be registered; keeping slash callbacks inactive",
+      );
+      return;
+    }
+
+    if (teamRegistrationFailures > 0) {
+      params.runtime.error?.(
+        `mattermost: slash command registration completed with ${teamRegistrationFailures} team error(s)`,
+      );
+    }
+
+    activateSlashCommands({
+      account: params.account,
+      commandTokens: registered.map((cmd) => cmd.token).filter(Boolean),
+      registeredCommands: registered,
+      triggerMap: buildTriggerMap(dedupedCommands),
+      api: { cfg: params.cfg, runtime: params.runtime },
+      log: (msg) => params.runtime.log?.(msg),
+    });
+
+    params.runtime.log?.(
+      `mattermost: slash commands registered (${registered.length} commands across ${teams.length} teams, callback=${slashCallbackUrl})`,
+    );
+  } catch (err) {
+    params.runtime.error?.(`mattermost: failed to register slash commands: ${String(err)}`);
+  }
+}

extensions/mattermost/src/mattermost/monitor-websocket.test.ts

@@ -0,0 +1,510 @@
+// Mattermost tests cover monitor websocket plugin behavior.
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { RuntimeEnv } from "../../runtime-api.js";
+import {
+  createMattermostConnectOnce,
+  type MattermostWebSocketLike,
+  WebSocketClosedBeforeOpenError,
+} from "./monitor-websocket.js";
+
+function countMatching<T>(items: readonly T[], predicate: (item: T) => boolean): number {
+  let count = 0;
+  for (const item of items) {
+    if (predicate(item)) {
+      count += 1;
+    }
+  }
+  return count;
+}
+
+class FakeWebSocket implements MattermostWebSocketLike {
+  public readonly sent: string[] = [];
+  public pingCalls = 0;
+  public closeCalls = 0;
+  public terminateCalls = 0;
+  private openListeners: Array<() => void> = [];
+  private messageListeners: Array<(data: Buffer) => void | Promise<void>> = [];
+  private pongListeners: Array<(data: Buffer) => void> = [];
+  private closeListeners: Array<(code: number, reason: Buffer) => void> = [];
+  private errorListeners: Array<(err: unknown) => void> = [];
+
+  on(event: "open", listener: () => void): void;
+  on(event: "message", listener: (data: Buffer) => void | Promise<void>): void;
+  on(event: "pong", listener: (data: Buffer) => void): void;
+  on(event: "close", listener: (code: number, reason: Buffer) => void): void;
+  on(event: "error", listener: (err: unknown) => void): void;
+  on(event: "open" | "message" | "pong" | "close" | "error", listener: unknown): void {
+    if (event === "open") {
+      this.openListeners.push(listener as () => void);
+      return;
+    }
+    if (event === "message") {
+      this.messageListeners.push(listener as (data: Buffer) => void | Promise<void>);
+      return;
+    }
+    if (event === "pong") {
+      this.pongListeners.push(listener as (data: Buffer) => void);
+      return;
+    }
+    if (event === "close") {
+      this.closeListeners.push(listener as (code: number, reason: Buffer) => void);
+      return;
+    }
+    this.errorListeners.push(listener as (err: unknown) => void);
+  }
+
+  ping(): void {
+    this.pingCalls++;
+  }
+
+  send(data: string): void {
+    this.sent.push(data);
+  }
+
+  close(): void {
+    this.closeCalls++;
+  }
+
+  terminate(): void {
+    this.terminateCalls++;
+  }
+
+  emitOpen(): void {
+    for (const listener of this.openListeners) {
+      listener();
+    }
+  }
+
+  emitMessage(data: Buffer): void {
+    for (const listener of this.messageListeners) {
+      void listener(data);
+    }
+  }
+
+  emitPong(data = Buffer.alloc(0)): void {
+    for (const listener of this.pongListeners) {
+      listener(data);
+    }
+  }
+
+  emitClose(code: number, reason = ""): void {
+    const buffer = Buffer.from(reason, "utf8");
+    for (const listener of this.closeListeners) {
+      listener(code, buffer);
+    }
+  }
+
+  emitError(err: unknown): void {
+    for (const listener of this.errorListeners) {
+      listener(err);
+    }
+  }
+}
+
+const testRuntime = (): RuntimeEnv =>
+  ({
+    log: vi.fn(),
+    error: vi.fn(),
+    exit: ((code: number): never => {
+      throw new Error(`exit ${code}`);
+    }) as RuntimeEnv["exit"],
+  }) as RuntimeEnv;
+
+describe("mattermost websocket monitor", () => {
+  beforeEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("rejects when websocket closes before open", async () => {
+    const socket = new FakeWebSocket();
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+    });
+
+    queueMicrotask(() => {
+      socket.emitClose(1006, "connection refused");
+    });
+
+    let failure: unknown;
+    try {
+      await connectOnce();
+    } catch (caught) {
+      failure = caught;
+    }
+    expect(failure).toBeInstanceOf(WebSocketClosedBeforeOpenError);
+    expect((failure as WebSocketClosedBeforeOpenError).message).toBe(
+      "websocket closed before open (code 1006)",
+    );
+    expect((failure as WebSocketClosedBeforeOpenError).code).toBe(1006);
+    expect((failure as WebSocketClosedBeforeOpenError).reason).toBe("connection refused");
+  });
+
+  it("retries when first attempt errors before open and next attempt succeeds", async () => {
+    const patches: Array<Record<string, unknown>> = [];
+    const sockets: FakeWebSocket[] = [];
+
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: (() => {
+        let seq = 1;
+        return () => seq++;
+      })(),
+      onPosted: async () => {},
+      statusSink: (patch) => {
+        patches.push(patch as Record<string, unknown>);
+      },
+      webSocketFactory: () => {
+        const socket = new FakeWebSocket();
+        const attempt = sockets.length;
+        sockets.push(socket);
+        queueMicrotask(() => {
+          if (attempt === 0) {
+            socket.emitError(new Error("boom"));
+            socket.emitClose(1006, "connection refused");
+            return;
+          }
+          socket.emitOpen();
+          socket.emitClose(1000);
+        });
+        return socket;
+      },
+    });
+
+    const firstAttempt = connectOnce();
+    await expect(firstAttempt).rejects.toBeInstanceOf(WebSocketClosedBeforeOpenError);
+
+    await connectOnce();
+
+    expect(sockets).toHaveLength(2);
+    expect(sockets[0].closeCalls).toBe(1);
+    expect(sockets[1].sent).toHaveLength(1);
+    expect(JSON.parse(sockets[1].sent[0] ?? "")).toEqual({
+      action: "authentication_challenge",
+      data: { token: "token" },
+      seq: 1,
+    });
+    expect(countMatching(patches, (patch) => patch.connected === true)).toBe(1);
+    expect(countMatching(patches, (patch) => patch.connected === false)).toBe(2);
+  });
+
+  it("dispatches reaction events to the reaction handler", async () => {
+    const socket = new FakeWebSocket();
+    const onPosted = vi.fn(async () => {});
+    const onReaction = vi.fn(async (payload) => payload);
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted,
+      onReaction,
+      webSocketFactory: () => socket,
+    });
+
+    const connected = connectOnce();
+    queueMicrotask(() => {
+      socket.emitOpen();
+      socket.emitMessage(
+        Buffer.from(
+          JSON.stringify({
+            event: "reaction_added",
+            data: {
+              reaction: JSON.stringify({
+                user_id: "user-1",
+                post_id: "post-1",
+                emoji_name: "thumbsup",
+              }),
+            },
+          }),
+        ),
+      );
+      socket.emitClose(1000);
+    });
+
+    await connected;
+
+    expect(onReaction).toHaveBeenCalledTimes(1);
+    expect(onPosted).not.toHaveBeenCalled();
+    const reaction = JSON.stringify({
+      user_id: "user-1",
+      post_id: "post-1",
+      emoji_name: "thumbsup",
+    });
+    const payload = onReaction.mock.calls.at(0)?.[0];
+    expect(payload).toEqual({
+      event: "reaction_added",
+      data: { reaction },
+    });
+  });
+
+  it("terminates when bot update_at changes (disable/enable cycle)", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    let updateAt = 1000;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => updateAt,
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    // Let initial getBotUpdateAt resolve
+    await vi.advanceTimersByTimeAsync(0);
+
+    // update_at unchanged — no terminate
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+
+    // Simulate disable/enable — update_at changes
+    updateAt = 2000;
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(1);
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: bot account updated (update_at changed: 1000 → 2000) — reconnecting",
+    );
+
+    socket.emitClose(1006);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("keeps connection alive when update_at stays the same", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => 1000,
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    await vi.advanceTimersByTimeAsync(300);
+    expect(socket.terminateCalls).toBe(0);
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("continues protocol keepalive when Mattermost responds with pong", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      pingIntervalMs: 100,
+      pongTimeoutMs: 25,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.pingCalls).toBe(1);
+
+    socket.emitPong();
+    await vi.advanceTimersByTimeAsync(25);
+    expect(socket.terminateCalls).toBe(0);
+
+    await vi.advanceTimersByTimeAsync(75);
+    expect(socket.pingCalls).toBe(2);
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("terminates silent websocket drops when Mattermost misses pong timeout", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    let pollCount = 0;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        pollCount++;
+        return 1000;
+      },
+      healthCheckIntervalMs: 100,
+      pingIntervalMs: 50,
+      pongTimeoutMs: 25,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(pollCount).toBe(1);
+
+    await vi.advanceTimersByTimeAsync(50);
+    expect(socket.pingCalls).toBe(1);
+    expect(socket.terminateCalls).toBe(0);
+
+    await vi.advanceTimersByTimeAsync(25);
+    expect(socket.terminateCalls).toBe(1);
+    expect(runtime.error).toHaveBeenCalledWith("mattermost websocket pong timeout — reconnecting");
+
+    await vi.advanceTimersByTimeAsync(500);
+    expect(socket.pingCalls).toBe(1);
+    expect(pollCount).toBe(1);
+
+    socket.emitClose(1006);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("does not terminate when getBotUpdateAt throws", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    let shouldThrow = false;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        if (shouldThrow) {
+          throw new Error("network error");
+        }
+        return 1000;
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+
+    // API error — should log but not terminate
+    shouldThrow = true;
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: health check error: Error: network error",
+    );
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("keeps polling when the initial getBotUpdateAt call fails", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const runtime = testRuntime();
+    const responses: Array<number | Error> = [new Error("network error"), 1000, 2000];
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime,
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        const next = responses.shift();
+        if (next instanceof Error) {
+          throw next;
+        }
+        return next ?? 2000;
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(runtime.error).toHaveBeenCalledWith(
+      "mattermost: failed to get initial update_at: Error: network error",
+    );
+
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(0);
+
+    await vi.advanceTimersByTimeAsync(100);
+    expect(socket.terminateCalls).toBe(1);
+    expect(runtime.log).toHaveBeenCalledWith(
+      "mattermost: bot account updated (update_at changed: 1000 → 2000) — reconnecting",
+    );
+
+    socket.emitClose(1006);
+    await connected;
+    vi.useRealTimers();
+  });
+
+  it("does not overlap health checks when a prior poll is still running", async () => {
+    vi.useFakeTimers();
+    const socket = new FakeWebSocket();
+    const resolvers: Array<(value: number) => void> = [];
+    let pollCount = 0;
+    const connectOnce = createMattermostConnectOnce({
+      wsUrl: "wss://example.invalid/api/v4/websocket",
+      botToken: "token",
+      runtime: testRuntime(),
+      nextSeq: () => 1,
+      onPosted: async () => {},
+      webSocketFactory: () => socket,
+      getBotUpdateAt: async () => {
+        pollCount++;
+        return await new Promise<number>((resolve) => {
+          resolvers.push(resolve);
+        });
+      },
+      healthCheckIntervalMs: 100,
+    });
+
+    const connected = connectOnce();
+    socket.emitOpen();
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(pollCount).toBe(1);
+
+    await vi.advanceTimersByTimeAsync(300);
+    expect(pollCount).toBe(1);
+
+    resolvers[0]?.(1000);
+    await vi.advanceTimersByTimeAsync(0);
+    await vi.advanceTimersByTimeAsync(100);
+    expect(pollCount).toBe(2);
+
+    socket.emitClose(1000);
+    await connected;
+    vi.useRealTimers();
+  });
+});

extensions/mattermost/src/mattermost/monitor-websocket.ts

@@ -0,0 +1,432 @@
+// Mattermost plugin module implements monitor websocket behavior.
+import { randomUUID } from "node:crypto";
+import { safeParseJsonWithSchema, safeParseWithSchema } from "openclaw/plugin-sdk/extension-shared";
+import {
+  captureWsEvent,
+  createDebugProxyWebSocketAgent,
+  resolveDebugProxySettings,
+} from "openclaw/plugin-sdk/proxy-capture";
+import WebSocket from "ws";
+import { z } from "zod";
+import { MattermostPostSchema, type MattermostPost } from "./client.js";
+import { rawDataToString } from "./monitor-helpers.js";
+import type { ChannelAccountSnapshot, RuntimeEnv } from "./runtime-api.js";
+
+export type MattermostEventPayload = {
+  event?: string;
+  data?: {
+    post?: string | MattermostPost;
+    reaction?: string | Record<string, unknown>;
+    channel_id?: string;
+    channel_name?: string;
+    channel_display_name?: string;
+    channel_type?: string;
+    sender_name?: string;
+    team_id?: string;
+  };
+  broadcast?: {
+    channel_id?: string;
+    team_id?: string;
+    user_id?: string;
+  };
+};
+
+export type MattermostWebSocketLike = {
+  on(event: "open", listener: () => void): void;
+  on(event: "message", listener: (data: WebSocket.RawData) => void | Promise<void>): void;
+  on(event: "pong", listener: (data: Buffer) => void): void;
+  on(event: "close", listener: (code: number, reason: Buffer) => void): void;
+  on(event: "error", listener: (err: unknown) => void): void;
+  ping(): void;
+  send(data: string): void;
+  close(): void;
+  terminate(): void;
+};
+
+export type MattermostWebSocketFactory = (url: string) => MattermostWebSocketLike;
+const MattermostEventPayloadSchema = z.object({
+  event: z.string().optional(),
+  data: z
+    .object({
+      post: z.union([z.string(), MattermostPostSchema]).optional(),
+      reaction: z.union([z.string(), z.record(z.string(), z.unknown())]).optional(),
+      channel_id: z.string().optional(),
+      channel_name: z.string().optional(),
+      channel_display_name: z.string().optional(),
+      channel_type: z.string().optional(),
+      sender_name: z.string().optional(),
+      team_id: z.string().optional(),
+    })
+    .optional(),
+  broadcast: z
+    .object({
+      channel_id: z.string().optional(),
+      team_id: z.string().optional(),
+      user_id: z.string().optional(),
+    })
+    .optional(),
+}) as z.ZodType<MattermostEventPayload>;
+
+function parseMattermostEventPayload(raw: string): MattermostEventPayload | null {
+  return safeParseJsonWithSchema(MattermostEventPayloadSchema, raw);
+}
+
+function parseMattermostPost(value: unknown): MattermostPost | null {
+  if (typeof value === "string") {
+    return safeParseJsonWithSchema(MattermostPostSchema, value);
+  }
+  return safeParseWithSchema(MattermostPostSchema, value);
+}
+
+export class WebSocketClosedBeforeOpenError extends Error {
+  constructor(
+    public readonly code: number,
+    public readonly reason?: string,
+  ) {
+    super(`websocket closed before open (code ${code})`);
+    this.name = "WebSocketClosedBeforeOpenError";
+  }
+}
+
+type CreateMattermostConnectOnceOpts = {
+  wsUrl: string;
+  botToken: string;
+  abortSignal?: AbortSignal;
+  statusSink?: (patch: Partial<ChannelAccountSnapshot>) => void;
+  runtime: RuntimeEnv;
+  nextSeq: () => number;
+  onPosted: (post: MattermostPost, payload: MattermostEventPayload) => Promise<void>;
+  onReaction?: (payload: MattermostEventPayload) => Promise<void>;
+  webSocketFactory?: MattermostWebSocketFactory;
+  /**
+   * Called periodically to check whether the bot account has been modified
+   * (e.g. disabled then re-enabled) since the WebSocket was opened.
+   * Returns the bot's current `update_at` timestamp.  When it differs from
+   * the value recorded at connect time, the connection is terminated so the
+   * reconnect loop can establish a fresh one.
+   */
+  getBotUpdateAt?: () => Promise<number>;
+  healthCheckIntervalMs?: number;
+  pingIntervalMs?: number;
+  pongTimeoutMs?: number;
+};
+
+const defaultMattermostWebSocketFactory: MattermostWebSocketFactory = (url) => {
+  const agent = createDebugProxyWebSocketAgent(resolveDebugProxySettings());
+  return new WebSocket(url, agent ? { agent } : undefined) as MattermostWebSocketLike;
+};
+
+function parsePostedPayload(
+  payload: MattermostEventPayload,
+): { payload: MattermostEventPayload; post: MattermostPost } | null {
+  if (payload.event !== "posted") {
+    return null;
+  }
+  const postData = payload.data?.post;
+  if (!postData) {
+    return null;
+  }
+  const post = parseMattermostPost(postData);
+  if (!post) {
+    return null;
+  }
+  return { payload, post };
+}
+
+export function createMattermostConnectOnce(
+  opts: CreateMattermostConnectOnceOpts,
+): () => Promise<void> {
+  const webSocketFactory = opts.webSocketFactory ?? defaultMattermostWebSocketFactory;
+  const healthCheckIntervalMs = opts.healthCheckIntervalMs ?? 30_000;
+  const pingIntervalMs = opts.pingIntervalMs ?? 30_000;
+  const pongTimeoutMs = opts.pongTimeoutMs ?? 10_000;
+  return async () => {
+    const flowId = randomUUID();
+    const ws = webSocketFactory(opts.wsUrl);
+    const onAbort = () => ws.terminate();
+    opts.abortSignal?.addEventListener("abort", onAbort, { once: true });
+    const getBotUpdateAt = opts.getBotUpdateAt;
+
+    try {
+      return await new Promise<void>((resolve, reject) => {
+        let opened = false;
+        let settled = false;
+        let healthCheckEnabled = getBotUpdateAt != null;
+        let healthCheckInFlight = false;
+        let healthCheckTimer: ReturnType<typeof setTimeout> | undefined;
+        let protocolKeepaliveEnabled = true;
+        let protocolPingTimer: ReturnType<typeof setTimeout> | undefined;
+        let protocolPongTimer: ReturnType<typeof setTimeout> | undefined;
+        let initialUpdateAt: number | undefined;
+
+        const clearTimers = () => {
+          if (healthCheckTimer !== undefined) {
+            clearTimeout(healthCheckTimer);
+            healthCheckTimer = undefined;
+          }
+          if (protocolPingTimer !== undefined) {
+            clearTimeout(protocolPingTimer);
+            protocolPingTimer = undefined;
+          }
+          if (protocolPongTimer !== undefined) {
+            clearTimeout(protocolPongTimer);
+            protocolPongTimer = undefined;
+          }
+        };
+
+        const stopHealthChecks = () => {
+          healthCheckEnabled = false;
+          protocolKeepaliveEnabled = false;
+          clearTimers();
+        };
+
+        const sendProtocolPing = () => {
+          if (!protocolKeepaliveEnabled || settled) {
+            return;
+          }
+          if (protocolPongTimer !== undefined) {
+            clearTimeout(protocolPongTimer);
+          }
+          protocolPongTimer = setTimeout(() => {
+            protocolPongTimer = undefined;
+            if (!protocolKeepaliveEnabled || settled) {
+              return;
+            }
+            opts.runtime.error?.("mattermost websocket pong timeout — reconnecting");
+            stopHealthChecks();
+            ws.terminate();
+          }, pongTimeoutMs);
+          try {
+            ws.ping();
+          } catch (err) {
+            if (!protocolKeepaliveEnabled || settled) {
+              return;
+            }
+            opts.runtime.error?.(`mattermost websocket ping failed: ${String(err)}`);
+            stopHealthChecks();
+            ws.terminate();
+          }
+        };
+
+        const scheduleProtocolPing = () => {
+          if (!protocolKeepaliveEnabled || settled || protocolPingTimer !== undefined) {
+            return;
+          }
+          protocolPingTimer = setTimeout(() => {
+            protocolPingTimer = undefined;
+            sendProtocolPing();
+          }, pingIntervalMs);
+        };
+
+        const scheduleHealthCheck = () => {
+          if (!getBotUpdateAt || !healthCheckEnabled || settled || healthCheckInFlight) {
+            return;
+          }
+          healthCheckTimer = setTimeout(() => {
+            healthCheckTimer = undefined;
+            void runHealthCheck();
+          }, healthCheckIntervalMs);
+        };
+
+        const runHealthCheck = async () => {
+          if (!getBotUpdateAt || !healthCheckEnabled || settled || healthCheckInFlight) {
+            return;
+          }
+          healthCheckInFlight = true;
+          try {
+            const current = await getBotUpdateAt();
+            if (!healthCheckEnabled || settled) {
+              return;
+            }
+            if (initialUpdateAt === undefined) {
+              initialUpdateAt = current;
+              return;
+            }
+            if (current !== initialUpdateAt) {
+              opts.runtime.log?.(
+                `mattermost: bot account updated (update_at changed: ${initialUpdateAt} → ${current}) — reconnecting`,
+              );
+              stopHealthChecks();
+              ws.terminate();
+            }
+          } catch (err) {
+            if (!healthCheckEnabled || settled) {
+              return;
+            }
+            const label =
+              initialUpdateAt === undefined
+                ? "mattermost: failed to get initial update_at"
+                : "mattermost: health check error";
+            opts.runtime.error?.(`${label}: ${String(err)}`);
+          } finally {
+            healthCheckInFlight = false;
+            scheduleHealthCheck();
+          }
+        };
+
+        const resolveOnce = () => {
+          if (settled) {
+            return;
+          }
+          settled = true;
+          stopHealthChecks();
+          resolve();
+        };
+        const rejectOnce = (error: Error) => {
+          if (settled) {
+            return;
+          }
+          settled = true;
+          stopHealthChecks();
+          reject(error);
+        };
+
+        ws.on("open", () => {
+          opened = true;
+          captureWsEvent({
+            url: opts.wsUrl,
+            direction: "local",
+            kind: "ws-open",
+            flowId,
+            meta: { subsystem: "mattermost-websocket" },
+          });
+          opts.statusSink?.({
+            connected: true,
+            lastConnectedAt: Date.now(),
+            lastError: null,
+          });
+          const authPayload = JSON.stringify({
+            seq: opts.nextSeq(),
+            action: "authentication_challenge",
+            data: { token: opts.botToken },
+          });
+          captureWsEvent({
+            url: opts.wsUrl,
+            direction: "outbound",
+            kind: "ws-frame",
+            flowId,
+            payload: authPayload,
+            meta: { subsystem: "mattermost-websocket", eventType: "authentication_challenge" },
+          });
+          ws.send(authPayload);
+          scheduleProtocolPing();
+
+          // Periodically check if the bot account was modified (e.g. disable/enable).
+          // After such a cycle the WebSocket silently stops delivering events even
+          // though the connection itself stays alive.  Comparing update_at detects
+          // this reliably regardless of how quickly the cycle happens.
+          if (getBotUpdateAt) {
+            // Use a recursive timeout so only one REST poll can be in flight at a time.
+            void runHealthCheck();
+          }
+        });
+
+        ws.on("pong", () => {
+          if (protocolPongTimer !== undefined) {
+            clearTimeout(protocolPongTimer);
+            protocolPongTimer = undefined;
+          }
+          scheduleProtocolPing();
+        });
+
+        ws.on("message", async (data) => {
+          captureWsEvent({
+            url: opts.wsUrl,
+            direction: "inbound",
+            kind: "ws-frame",
+            flowId,
+            payload: Buffer.from(rawDataToString(data)),
+            meta: { subsystem: "mattermost-websocket" },
+          });
+          const raw = rawDataToString(data);
+          const payload = parseMattermostEventPayload(raw);
+          if (!payload) {
+            return;
+          }
+
+          if (payload.event === "reaction_added" || payload.event === "reaction_removed") {
+            if (!opts.onReaction) {
+              return;
+            }
+            try {
+              await opts.onReaction(payload);
+            } catch (err) {
+              opts.runtime.error?.(`mattermost reaction handler failed: ${String(err)}`);
+            }
+            return;
+          }
+
+          if (payload.event !== "posted") {
+            return;
+          }
+          const parsed = parsePostedPayload(payload);
+          if (!parsed) {
+            return;
+          }
+          try {
+            await opts.onPosted(parsed.post, parsed.payload);
+          } catch (err) {
+            opts.runtime.error?.(`mattermost handler failed: ${String(err)}`);
+          }
+        });
+
+        ws.on("close", (code, reason) => {
+          captureWsEvent({
+            url: opts.wsUrl,
+            direction: "local",
+            kind: "ws-close",
+            flowId,
+            closeCode: code,
+            payload: reason,
+            meta: { subsystem: "mattermost-websocket" },
+          });
+          stopHealthChecks();
+          const message = reasonToString(reason);
+          opts.statusSink?.({
+            connected: false,
+            lastDisconnect: {
+              at: Date.now(),
+              status: code,
+              error: message || undefined,
+            },
+          });
+          if (opened) {
+            resolveOnce();
+            return;
+          }
+          rejectOnce(new WebSocketClosedBeforeOpenError(code, message || undefined));
+        });
+
+        ws.on("error", (err) => {
+          captureWsEvent({
+            url: opts.wsUrl,
+            direction: "local",
+            kind: "error",
+            flowId,
+            errorText: String(err),
+            meta: { subsystem: "mattermost-websocket" },
+          });
+          opts.runtime.error?.(`mattermost websocket error: ${String(err)}`);
+          opts.statusSink?.({
+            lastError: String(err),
+          });
+          try {
+            ws.close();
+          } catch {}
+        });
+      });
+    } finally {
+      opts.abortSignal?.removeEventListener("abort", onAbort);
+    }
+  };
+}
+
+function reasonToString(reason: Buffer | string | undefined): string {
+  if (!reason) {
+    return "";
+  }
+  if (typeof reason === "string") {
+    return reason;
+  }
+  return reason.length > 0 ? reason.toString("utf8") : "";
+}

extensions/mattermost/src/mattermost/monitor.authz.test.ts

@@ -0,0 +1,304 @@
+// Mattermost tests cover monitor.authz plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  authorizeMattermostCommandInvocation,
+  resolveMattermostMonitorInboundAccess,
+} from "./monitor-auth.js";
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  streamingMode: "partial",
+  config: {},
+};
+
+function authorizeGroupCommand(senderId: string) {
+  return authorizeMattermostCommandInvocation({
+    account: {
+      ...accountFixture,
+      config: {
+        groupPolicy: "allowlist",
+        allowFrom: ["trusted-user"],
+      },
+    },
+    cfg: {
+      commands: {
+        useAccessGroups: true,
+      },
+    },
+    senderId,
+    senderName: senderId,
+    channelId: "chan-1",
+    channelInfo: {
+      id: "chan-1",
+      type: "O",
+      name: "general",
+      display_name: "General",
+    },
+    storeAllowFrom: [],
+    allowTextCommands: true,
+    hasControlCommand: true,
+  });
+}
+
+describe("mattermost monitor authz", () => {
+  it("keeps DM allowlist merged with pairing-store entries", async () => {
+    const resolved = await resolveMattermostMonitorInboundAccess({
+      account: {
+        ...accountFixture,
+        config: {
+          allowFrom: ["@trusted-user"],
+          groupAllowFrom: ["@group-owner"],
+        },
+      },
+      cfg: {},
+      senderId: "trusted-user",
+      senderName: "Trusted User",
+      channelId: "dm-1",
+      kind: "direct",
+      groupPolicy: "allowlist",
+      storeAllowFrom: ["user:attacker"],
+      allowTextCommands: false,
+      hasControlCommand: false,
+    });
+
+    expect(resolved.senderAccess.effectiveAllowFrom).toEqual(["trusted-user", "attacker"]);
+  });
+
+  it("uses explicit groupAllowFrom without pairing-store inheritance", async () => {
+    const resolved = await resolveMattermostMonitorInboundAccess({
+      account: {
+        ...accountFixture,
+        config: {
+          allowFrom: ["@trusted-user"],
+          groupAllowFrom: ["@group-owner"],
+        },
+      },
+      cfg: {},
+      senderId: "group-owner",
+      senderName: "Group Owner",
+      channelId: "chan-1",
+      kind: "channel",
+      groupPolicy: "allowlist",
+      storeAllowFrom: ["user:attacker"],
+      allowTextCommands: false,
+      hasControlCommand: false,
+    });
+
+    expect(resolved.senderAccess.effectiveGroupAllowFrom).toEqual(["group-owner"]);
+  });
+
+  it("falls group allowlist back to allowFrom without pairing-store entries", async () => {
+    const resolved = await resolveMattermostMonitorInboundAccess({
+      account: {
+        ...accountFixture,
+        config: {
+          allowFrom: ["@trusted-user"],
+        },
+      },
+      cfg: {},
+      senderId: "trusted-user",
+      senderName: "Trusted User",
+      channelId: "chan-1",
+      kind: "channel",
+      groupPolicy: "allowlist",
+      storeAllowFrom: ["user:attacker"],
+      allowTextCommands: false,
+      hasControlCommand: false,
+    });
+
+    expect(resolved.senderAccess.effectiveGroupAllowFrom).toEqual(["trusted-user"]);
+  });
+
+  it("does not auto-authorize DM commands in open mode without allowlists", async () => {
+    const access = await resolveMattermostMonitorInboundAccess({
+      account: {
+        ...accountFixture,
+        config: {
+          dmPolicy: "open",
+        },
+      },
+      cfg: {
+        commands: {
+          useAccessGroups: true,
+        },
+      },
+      senderId: "alice",
+      senderName: "Alice",
+      channelId: "dm-1",
+      kind: "direct",
+      groupPolicy: "allowlist",
+      storeAllowFrom: [],
+      allowTextCommands: true,
+      hasControlCommand: true,
+    });
+
+    expect(access.ingress.decision).toBe("block");
+    expect(access.commandAccess.authorized).toBe(false);
+  });
+
+  it("denies group control commands when the sender is outside the allowlist", async () => {
+    const decision = await authorizeGroupCommand("attacker");
+
+    expect(decision).toEqual({
+      ok: false,
+      denyReason: "unauthorized",
+      commandAuthorized: false,
+      channelInfo: {
+        id: "chan-1",
+        type: "O",
+        name: "general",
+        display_name: "General",
+      },
+      kind: "channel",
+      chatType: "channel",
+      channelName: "general",
+      channelDisplay: "General",
+      roomLabel: "#general",
+    });
+  });
+
+  it("authorizes group control commands for allowlisted senders", async () => {
+    const decision = await authorizeGroupCommand("trusted-user");
+
+    expect(decision).toEqual({
+      ok: true,
+      commandAuthorized: true,
+      channelInfo: {
+        id: "chan-1",
+        type: "O",
+        name: "general",
+        display_name: "General",
+      },
+      kind: "channel",
+      chatType: "channel",
+      channelName: "general",
+      channelDisplay: "General",
+      roomLabel: "#general",
+    });
+  });
+
+  it("denies command invocations when channel type is unavailable", async () => {
+    const decision = await authorizeMattermostCommandInvocation({
+      account: {
+        ...accountFixture,
+        config: {
+          dmPolicy: "allowlist",
+          groupPolicy: "open",
+          allowFrom: ["trusted-user"],
+        },
+      },
+      cfg: {},
+      senderId: "new-user",
+      senderName: "New User",
+      channelId: "dm-1",
+      channelInfo: {
+        id: "dm-1",
+        name: "",
+        display_name: "",
+      },
+      storeAllowFrom: [],
+      allowTextCommands: true,
+      hasControlCommand: true,
+    });
+
+    expect(decision).toEqual({
+      ok: false,
+      denyReason: "unknown-channel",
+      commandAuthorized: false,
+      channelInfo: {
+        id: "dm-1",
+        name: "",
+        display_name: "",
+      },
+      kind: "channel",
+      chatType: "channel",
+      channelName: "",
+      channelDisplay: "",
+      roomLabel: "#dm-1",
+    });
+  });
+
+  it("authorizes group senders through static access groups", async () => {
+    const decision = await authorizeMattermostCommandInvocation({
+      account: {
+        ...accountFixture,
+        config: {
+          groupPolicy: "allowlist",
+          groupAllowFrom: ["accessGroup:oncall"],
+        },
+      },
+      cfg: {
+        commands: {
+          useAccessGroups: true,
+        },
+        accessGroups: {
+          oncall: {
+            type: "message.senders",
+            members: {
+              mattermost: ["mattermost:trusted-user"],
+            },
+          },
+        },
+      },
+      senderId: "trusted-user",
+      senderName: "Trusted User",
+      channelId: "chan-1",
+      channelInfo: {
+        id: "chan-1",
+        type: "O",
+        name: "general",
+        display_name: "General",
+      },
+      storeAllowFrom: [],
+      allowTextCommands: true,
+      hasControlCommand: true,
+    });
+
+    expect(decision).toEqual({
+      ok: true,
+      commandAuthorized: true,
+      channelInfo: {
+        id: "chan-1",
+        type: "O",
+        name: "general",
+        display_name: "General",
+      },
+      kind: "channel",
+      chatType: "channel",
+      channelName: "general",
+      channelDisplay: "General",
+      roomLabel: "#general",
+    });
+  });
+
+  it("fails direct reaction access without pairing admission", async () => {
+    const access = await resolveMattermostMonitorInboundAccess({
+      account: {
+        ...accountFixture,
+        config: {
+          dmPolicy: "pairing",
+        },
+      },
+      cfg: {},
+      senderId: "new-user",
+      senderName: "New User",
+      channelId: "dm-1",
+      kind: "direct",
+      groupPolicy: "allowlist",
+      storeAllowFrom: [],
+      allowTextCommands: false,
+      hasControlCommand: false,
+      eventKind: "reaction",
+      mayPair: false,
+    });
+
+    expect(access.ingress.decision).toBe("block");
+    expect(access.ingress.reasonCode).toBe("event_pairing_not_allowed");
+  });
+});

extensions/mattermost/src/mattermost/monitor.channel-kind.test.ts

@@ -0,0 +1,26 @@
+// Mattermost tests cover monitor.channel kind plugin behavior.
+import { describe, expect, it } from "vitest";
+import { mapMattermostChannelTypeToChatType } from "./monitor.js";
+
+describe("mapMattermostChannelTypeToChatType", () => {
+  it("maps direct and group dm channel types", () => {
+    expect(mapMattermostChannelTypeToChatType("D")).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("g")).toBe("group");
+  });
+
+  it("maps private channels to group", () => {
+    expect(mapMattermostChannelTypeToChatType("P")).toBe("group");
+    expect(mapMattermostChannelTypeToChatType(" p ")).toBe("group");
+  });
+
+  it("keeps public channels and unknown typed values as channel", () => {
+    expect(mapMattermostChannelTypeToChatType("O")).toBe("channel");
+    expect(mapMattermostChannelTypeToChatType("x")).toBe("channel");
+  });
+
+  it("treats missing channel type as direct", () => {
+    expect(mapMattermostChannelTypeToChatType(undefined)).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType(null)).toBe("direct");
+    expect(mapMattermostChannelTypeToChatType("")).toBe("direct");
+  });
+});

extensions/mattermost/src/mattermost/no-visible-reply-diagnostic.test.ts

@@ -0,0 +1,141 @@
+// Mattermost tests cover no visible reply diagnostic plugin behavior.
+import { describe, expect, it } from "vitest";
+import {
+  evaluateMattermostNoVisibleReply,
+  formatMattermostNoVisibleReplyLog,
+} from "./no-visible-reply-diagnostic.js";
+
+describe("evaluateMattermostNoVisibleReply", () => {
+  it("flags substantive text payloads that delivered empty (regression: #80501)", () => {
+    const violation = evaluateMattermostNoVisibleReply({
+      outcome: "empty",
+      payload: { text: "Here is the result of the work I did..." },
+    });
+    expect(violation).toStrictEqual({
+      reason: "no-visible-reply-after-final-delivery",
+      outcome: "empty",
+      finalTextLength: "Here is the result of the work I did...".length,
+      mediaUrlCount: 0,
+    });
+  });
+
+  it("flags payloads with media URLs that delivered empty (regression: #80501)", () => {
+    const violation = evaluateMattermostNoVisibleReply({
+      outcome: "empty",
+      payload: { mediaUrl: "https://example.org/a.png" },
+    });
+    expect(violation).toStrictEqual({
+      reason: "no-visible-reply-after-final-delivery",
+      outcome: "empty",
+      finalTextLength: 0,
+      mediaUrlCount: 1,
+    });
+  });
+
+  it("follows the SDK legacy media fallback when counting media URLs", () => {
+    const violation = evaluateMattermostNoVisibleReply({
+      outcome: "empty",
+      payload: {
+        mediaUrl: "https://example.org/a.png",
+        mediaUrls: ["https://example.org/b.png", "https://example.org/c.png"],
+      },
+    });
+    expect(violation?.mediaUrlCount).toBe(2);
+  });
+
+  it("does not flag reasoning_skipped outcome (intentional suppression)", () => {
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "reasoning_skipped",
+        payload: { text: "Reasoning: hidden" },
+      }),
+    ).toBeNull();
+  });
+
+  it("does not flag text outcome (visible delivery happened)", () => {
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "text",
+        payload: { text: "hello" },
+      }),
+    ).toBeNull();
+  });
+
+  it("does not flag media outcome (visible delivery happened)", () => {
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "media",
+        payload: { mediaUrl: "https://example.org/a.png" },
+      }),
+    ).toBeNull();
+  });
+
+  it("does not flag empty outcome when the payload was nominally empty (no text or media at all)", () => {
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "empty",
+        payload: {},
+      }),
+    ).toBeNull();
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "empty",
+        payload: { text: "" },
+      }),
+    ).toBeNull();
+    expect(
+      evaluateMattermostNoVisibleReply({
+        outcome: "empty",
+        payload: { text: "   \n\t  " },
+      }),
+    ).toBeNull();
+  });
+
+  it("trims whitespace when measuring finalTextLength", () => {
+    const violation = evaluateMattermostNoVisibleReply({
+      outcome: "empty",
+      payload: { text: "   hello   " },
+    });
+    expect(violation?.finalTextLength).toBe("hello".length);
+  });
+});
+
+describe("formatMattermostNoVisibleReplyLog", () => {
+  it("emits a grep-friendly single-line diagnostic with the expected key/value pairs", () => {
+    const line = formatMattermostNoVisibleReplyLog({
+      violation: {
+        reason: "no-visible-reply-after-final-delivery",
+        outcome: "empty",
+        finalTextLength: 137,
+        mediaUrlCount: 0,
+      },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "main",
+    });
+    expect(line).toBe(
+      "mattermost no-visible-reply: no-visible-reply-after-final-delivery" +
+        " to=channel:town-square" +
+        " accountId=default" +
+        " agentId=main" +
+        " outcome=empty" +
+        " finalTextLength=137" +
+        " mediaUrlCount=0",
+    );
+  });
+
+  it("falls back to unknown when agentId is undefined", () => {
+    const line = formatMattermostNoVisibleReplyLog({
+      violation: {
+        reason: "no-visible-reply-after-final-delivery",
+        outcome: "empty",
+        finalTextLength: 1,
+        mediaUrlCount: 0,
+      },
+      to: "channel:x",
+      accountId: "y",
+      agentId: undefined,
+    });
+    expect(line).toContain("agentId=unknown");
+  });
+});

extensions/mattermost/src/mattermost/no-visible-reply-diagnostic.ts

@@ -0,0 +1,64 @@
+// Mattermost plugin module implements no visible reply diagnostic behavior.
+import { countOutboundMedia } from "openclaw/plugin-sdk/reply-payload";
+import type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
+import type { MattermostReplyDeliveryOutcome } from "./reply-delivery.js";
+
+export type MattermostNoVisibleReplyViolation = {
+  reason: "no-visible-reply-after-final-delivery";
+  outcome: MattermostReplyDeliveryOutcome;
+  finalTextLength: number;
+  mediaUrlCount: number;
+};
+
+/**
+ * Detects the #80501 symptom: `deliverMattermostReplyPayload` accepted a
+ * substantive (non-reasoning) payload, called the underlying
+ * `deliverTextOrMediaReply`, and the outcome was `"empty"` — meaning the
+ * payload had no text and no media to send, so no Mattermost API call
+ * happened. The agent's run completes successfully, but no visible
+ * channel/thread reply ever surfaces to the user.
+ *
+ * Returns a structured violation when the outcome is `"empty"` for a payload
+ * that nominally carried user-facing content (text or media bytes that ended
+ * up dropped by `resolveSendableOutboundReplyParts`/`sendMediaWithLeadingCaption`).
+ * Returns `null` for `"reasoning_skipped"` (intentional suppression),
+ * `"text"`, or `"media"` (successful visible sends).
+ */
+export function evaluateMattermostNoVisibleReply(params: {
+  outcome: MattermostReplyDeliveryOutcome;
+  payload: ReplyPayload;
+}): MattermostNoVisibleReplyViolation | null {
+  if (params.outcome !== "empty") {
+    return null;
+  }
+  const finalText = typeof params.payload.text === "string" ? params.payload.text.trim() : "";
+  const mediaUrlCount = countOutboundMedia(params.payload);
+  // If the payload had no text and no media even nominally, the run had
+  // nothing to send and "empty" is the correct outcome — do not flag.
+  if (finalText.length === 0 && mediaUrlCount === 0) {
+    return null;
+  }
+  return {
+    reason: "no-visible-reply-after-final-delivery",
+    outcome: params.outcome,
+    finalTextLength: finalText.length,
+    mediaUrlCount,
+  };
+}
+
+export function formatMattermostNoVisibleReplyLog(params: {
+  violation: MattermostNoVisibleReplyViolation;
+  to: string;
+  accountId: string;
+  agentId: string | undefined;
+}): string {
+  return (
+    `mattermost no-visible-reply: ${params.violation.reason}` +
+    ` to=${params.to}` +
+    ` accountId=${params.accountId}` +
+    ` agentId=${params.agentId ?? "unknown"}` +
+    ` outcome=${params.violation.outcome}` +
+    ` finalTextLength=${params.violation.finalTextLength}` +
+    ` mediaUrlCount=${params.violation.mediaUrlCount}`
+  );
+}

extensions/mattermost/src/mattermost/probe.test.ts

@@ -0,0 +1,195 @@
+// Mattermost tests cover probe plugin behavior.
+import { MAX_TIMER_TIMEOUT_MS } from "openclaw/plugin-sdk/number-runtime";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { probeMattermost } from "./probe.js";
+
+const { mockFetchGuard, mockRelease } = vi.hoisted(() => ({
+  mockFetchGuard: vi.fn(),
+  mockRelease: vi.fn(async () => {}),
+}));
+
+vi.mock("openclaw/plugin-sdk/ssrf-runtime", async () => {
+  const original = (await vi.importActual("openclaw/plugin-sdk/ssrf-runtime")) as Record<
+    string,
+    unknown
+  >;
+  return { ...original, fetchWithSsrFGuard: mockFetchGuard };
+});
+
+function requireFirstFetchCall() {
+  const [call] = mockFetchGuard.mock.calls;
+  if (!call) {
+    throw new Error("expected Mattermost probe fetch call");
+  }
+  return call[0] as {
+    url?: string;
+    init?: { headers?: unknown; signal?: unknown };
+    auditContext?: string;
+    policy?: unknown;
+  };
+}
+
+describe("probeMattermost", () => {
+  beforeEach(() => {
+    mockFetchGuard.mockReset();
+    mockRelease.mockClear();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it("returns baseUrl missing for empty base URL", async () => {
+    await expect(probeMattermost(" ", "token")).resolves.toEqual({
+      ok: false,
+      error: "baseUrl missing",
+    });
+    expect(mockFetchGuard).not.toHaveBeenCalled();
+  });
+
+  it("normalizes base URL and returns bot info", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ id: "bot-1", username: "clawbot" }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    const result = await probeMattermost("https://mm.example.com/api/v4/", "bot-token");
+
+    const fetchCall = requireFirstFetchCall();
+    expect(fetchCall?.url).toBe("https://mm.example.com/api/v4/users/me");
+    expect(fetchCall?.init?.headers).toStrictEqual({ Authorization: "Bearer bot-token" });
+    expect(fetchCall?.init?.signal).toBeInstanceOf(AbortSignal);
+    expect(fetchCall?.auditContext).toBe("mattermost-probe");
+    expect(fetchCall?.policy).toBeUndefined();
+    const { elapsedMs, ...stableResult } = result;
+    expect(stableResult).toStrictEqual({
+      ok: true,
+      status: 200,
+      bot: { id: "bot-1", username: "clawbot" },
+    });
+    expect(elapsedMs).toBeGreaterThanOrEqual(0);
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("bounds and cancels oversized probe success JSON bodies", async () => {
+    let canceled = false;
+    let pulled = 0;
+    const oversizeChunk = new Uint8Array(2 * 1024 * 1024).fill(0x7b); // 2 MiB of "{"
+    const stream = new ReadableStream<Uint8Array>({
+      pull(controller) {
+        pulled += 1;
+        controller.enqueue(oversizeChunk);
+      },
+      cancel() {
+        canceled = true;
+      },
+    });
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(stream, {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    const result = await probeMattermost("https://mm.example.com", "bot-token");
+
+    expect(result.ok).toBe(false);
+    expect(result.status).toBeNull();
+    expect(result.error).toContain("JSON response exceeds 16777216 bytes");
+    expect(canceled).toBe(true);
+    expect(pulled).toBeLessThanOrEqual(12);
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("forwards allowPrivateNetwork to the SSRF guard policy", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ id: "bot-1" }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    await probeMattermost("https://mm.example.com", "bot-token", 2500, true);
+
+    const fetchCall = requireFirstFetchCall();
+    expect(fetchCall?.policy).toStrictEqual({ allowPrivateNetwork: true });
+  });
+
+  it("clamps oversized probe timeouts before scheduling", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ id: "bot-1" }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+    const setTimeoutSpy = vi.spyOn(globalThis, "setTimeout");
+    try {
+      await probeMattermost("https://mm.example.com", "bot-token", Number.MAX_SAFE_INTEGER);
+
+      expect(setTimeoutSpy).toHaveBeenCalledWith(expect.any(Function), MAX_TIMER_TIMEOUT_MS);
+    } finally {
+      setTimeoutSpy.mockRestore();
+    }
+  });
+
+  it("returns API error details from JSON response", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response(JSON.stringify({ message: "invalid auth token" }), {
+        status: 401,
+        statusText: "Unauthorized",
+        headers: { "content-type": "application/json" },
+      }),
+      release: mockRelease,
+    });
+
+    const result = await probeMattermost("https://mm.example.com", "bad-token");
+    const { elapsedMs, ...stableResult } = result;
+    expect(stableResult).toStrictEqual({
+      ok: false,
+      status: 401,
+      error: "invalid auth token",
+    });
+    expect(elapsedMs).toBeGreaterThanOrEqual(0);
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("falls back to statusText when error body is empty", async () => {
+    mockFetchGuard.mockResolvedValueOnce({
+      response: new Response("", {
+        status: 403,
+        statusText: "Forbidden",
+        headers: { "content-type": "text/plain" },
+      }),
+      release: mockRelease,
+    });
+
+    const result = await probeMattermost("https://mm.example.com", "token");
+    const { elapsedMs, ...stableResult } = result;
+    expect(stableResult).toStrictEqual({
+      ok: false,
+      status: 403,
+      error: "Forbidden",
+    });
+    expect(elapsedMs).toBeGreaterThanOrEqual(0);
+    expect(mockRelease).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns fetch error when request throws", async () => {
+    mockFetchGuard.mockRejectedValueOnce(new Error("network down"));
+
+    const result = await probeMattermost("https://mm.example.com", "token");
+    const { elapsedMs, ...stableResult } = result;
+    expect(stableResult).toStrictEqual({
+      ok: false,
+      status: null,
+      error: "network down",
+    });
+    expect(elapsedMs).toBeGreaterThanOrEqual(0);
+  });
+});

extensions/mattermost/src/mattermost/probe.ts

@@ -0,0 +1,80 @@
+// Mattermost plugin module implements probe behavior.
+import { formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
+import { resolveTimerTimeoutMs } from "openclaw/plugin-sdk/number-runtime";
+import { readProviderJsonResponse } from "openclaw/plugin-sdk/provider-http";
+import {
+  fetchWithSsrFGuard,
+  ssrfPolicyFromPrivateNetworkOptIn,
+} from "openclaw/plugin-sdk/ssrf-runtime";
+import { normalizeMattermostBaseUrl, readMattermostError, type MattermostUser } from "./client.js";
+import type { BaseProbeResult } from "./runtime-api.js";
+
+type MattermostProbe = BaseProbeResult & {
+  status?: number | null;
+  elapsedMs?: number | null;
+  bot?: MattermostUser;
+};
+
+export async function probeMattermost(
+  baseUrl: string,
+  botToken: string,
+  timeoutMs = 2500,
+  allowPrivateNetwork = false,
+): Promise<MattermostProbe> {
+  const normalized = normalizeMattermostBaseUrl(baseUrl);
+  if (!normalized) {
+    return { ok: false, error: "baseUrl missing" };
+  }
+  const url = `${normalized}/api/v4/users/me`;
+  const start = Date.now();
+  const resolvedTimeoutMs = timeoutMs > 0 ? resolveTimerTimeoutMs(timeoutMs, 2500) : 0;
+  const controller = resolvedTimeoutMs > 0 ? new AbortController() : undefined;
+  let timer: NodeJS.Timeout | null = null;
+  if (controller) {
+    timer = setTimeout(() => controller.abort(), resolvedTimeoutMs);
+  }
+  try {
+    const { response: res, release } = await fetchWithSsrFGuard({
+      url,
+      init: {
+        headers: { Authorization: `Bearer ${botToken}` },
+        signal: controller?.signal,
+      },
+      auditContext: "mattermost-probe",
+      policy: ssrfPolicyFromPrivateNetworkOptIn(allowPrivateNetwork),
+    });
+    try {
+      const elapsedMs = Date.now() - start;
+      if (!res.ok) {
+        const detail = await readMattermostError(res);
+        return {
+          ok: false,
+          status: res.status,
+          error: detail || res.statusText,
+          elapsedMs,
+        };
+      }
+      const bot = await readProviderJsonResponse<MattermostUser>(res, "Mattermost probe /users/me");
+      return {
+        ok: true,
+        status: res.status,
+        elapsedMs,
+        bot,
+      };
+    } finally {
+      await release();
+    }
+  } catch (err) {
+    const message = formatErrorMessage(err);
+    return {
+      ok: false,
+      status: null,
+      error: message,
+      elapsedMs: Date.now() - start,
+    };
+  } finally {
+    if (timer) {
+      clearTimeout(timer);
+    }
+  }
+}

extensions/mattermost/src/mattermost/reactions.test-helpers.ts

@@ -0,0 +1,100 @@
+// Mattermost helper module supports reactions helpers behavior.
+import { expect, vi } from "vitest";
+import type { OpenClawConfig } from "../../runtime-api.js";
+import type { MattermostFetch } from "./client.js";
+
+export function requestUrl(url: string | URL | Request): string {
+  if (typeof url === "string") {
+    return url;
+  }
+  if (url instanceof URL) {
+    return url.toString();
+  }
+  return url.url;
+}
+
+export function createMattermostTestConfig(): OpenClawConfig {
+  return {
+    channels: {
+      mattermost: {
+        enabled: true,
+        botToken: "test-token",
+        baseUrl: "https://chat.example.com",
+      },
+    },
+  };
+}
+
+export function createMattermostReactionFetchMock(params: {
+  postId: string;
+  emojiName: string;
+  mode: "add" | "remove" | "both";
+  userId?: string;
+  status?: number;
+  body?: unknown;
+}) {
+  const userId = params.userId ?? "BOT123";
+  const mode = params.mode;
+  const allowAdd = mode === "add" || mode === "both";
+  const allowRemove = mode === "remove" || mode === "both";
+  const addStatus = params.status ?? 201;
+  const removeStatus = params.status ?? 204;
+  const removePath = `/api/v4/users/${userId}/posts/${params.postId}/reactions/${encodeURIComponent(params.emojiName)}`;
+
+  return vi.fn<typeof fetch>(async (url, init) => {
+    const urlText = requestUrl(url);
+    if (urlText.endsWith("/api/v4/users/me")) {
+      return new Response(JSON.stringify({ id: userId }), {
+        status: 200,
+        headers: { "content-type": "application/json" },
+      });
+    }
+
+    if (allowAdd && urlText.endsWith("/api/v4/reactions")) {
+      expect(init?.method).toBe("POST");
+      const requestBody = init?.body;
+      if (typeof requestBody !== "string") {
+        throw new Error("expected string POST body");
+      }
+      expect(JSON.parse(requestBody)).toEqual({
+        user_id: userId,
+        post_id: params.postId,
+        emoji_name: params.emojiName,
+      });
+
+      const responseBody = params.body === undefined ? { ok: true } : params.body;
+      return new Response(
+        responseBody === null ? null : JSON.stringify(responseBody),
+        responseBody === null
+          ? { status: addStatus, headers: { "content-type": "text/plain" } }
+          : { status: addStatus, headers: { "content-type": "application/json" } },
+      );
+    }
+
+    if (allowRemove && urlText.endsWith(removePath)) {
+      expect(init?.method).toBe("DELETE");
+      const responseBody = params.body === undefined ? null : params.body;
+      return new Response(
+        responseBody === null ? null : JSON.stringify(responseBody),
+        responseBody === null
+          ? { status: removeStatus, headers: { "content-type": "text/plain" } }
+          : { status: removeStatus, headers: { "content-type": "application/json" } },
+      );
+    }
+
+    throw new Error(`unexpected url: ${urlText}`);
+  });
+}
+
+export async function withMockedGlobalFetch<T>(
+  fetchImpl: MattermostFetch,
+  run: () => Promise<T>,
+): Promise<T> {
+  const prevFetch = globalThis.fetch;
+  globalThis.fetch = fetchImpl;
+  try {
+    return await run();
+  } finally {
+    globalThis.fetch = prevFetch;
+  }
+}

extensions/mattermost/src/mattermost/reactions.test.ts

@@ -0,0 +1,202 @@
+// Mattermost tests cover reactions plugin behavior.
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import {
+  addMattermostReaction,
+  removeMattermostReaction,
+  resetMattermostReactionBotUserCacheForTests,
+} from "./reactions.js";
+import {
+  createMattermostReactionFetchMock,
+  createMattermostTestConfig,
+  requestUrl,
+} from "./reactions.test-helpers.js";
+
+describe("mattermost reactions", () => {
+  beforeEach(() => {
+    resetMattermostReactionBotUserCacheForTests();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  async function addReactionWithFetch(fetchMock: typeof fetch) {
+    return addMattermostReaction({
+      cfg: createMattermostTestConfig(),
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+  }
+
+  async function removeReactionWithFetch(fetchMock: typeof fetch) {
+    return removeMattermostReaction({
+      cfg: createMattermostTestConfig(),
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+  }
+
+  it("adds reactions by calling /users/me then POST /reactions", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const result = await addReactionWithFetch(fetchMock);
+
+    expect(result).toEqual({ ok: true });
+    expect(fetchMock).toHaveBeenCalled();
+  });
+
+  it("returns a Result error when add reaction API call fails", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST1",
+      emojiName: "thumbsup",
+      status: 500,
+      body: { id: "err", message: "boom" },
+    });
+
+    const result = await addReactionWithFetch(fetchMock);
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) {
+      expect(result.error).toContain("Mattermost add reaction failed");
+    }
+  });
+
+  it("removes reactions by calling /users/me then DELETE /users/:id/posts/:postId/reactions/:emoji", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "remove",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const result = await removeReactionWithFetch(fetchMock);
+
+    expect(result).toEqual({ ok: true });
+    expect(fetchMock).toHaveBeenCalled();
+  });
+
+  it("caches the bot user id across reaction mutations", async () => {
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "both",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    const cfg = createMattermostTestConfig();
+    const addResult = await addMattermostReaction({
+      cfg,
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+    const removeResult = await removeMattermostReaction({
+      cfg,
+      postId: "POST1",
+      emojiName: "thumbsup",
+      fetchImpl: fetchMock,
+    });
+
+    const usersMeCalls = fetchMock.mock.calls.filter((call) =>
+      requestUrl(call[0]).endsWith("/api/v4/users/me"),
+    );
+    expect(addResult).toEqual({ ok: true });
+    expect(removeResult).toEqual({ ok: true });
+    expect(usersMeCalls).toHaveLength(1);
+  });
+
+  it("does not reuse cached bot user ids while the process clock is invalid", async () => {
+    const cfg = createMattermostTestConfig();
+    const firstFetch = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST1",
+      emojiName: "thumbsup",
+      userId: "BOT_OLD",
+    });
+    const secondFetch = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST2",
+      emojiName: "thumbsup",
+      userId: "BOT_FRESH",
+    });
+    const thirdFetch = createMattermostReactionFetchMock({
+      mode: "add",
+      postId: "POST3",
+      emojiName: "thumbsup",
+      userId: "BOT_RECOVERED",
+    });
+
+    await expect(
+      addMattermostReaction({
+        cfg,
+        postId: "POST1",
+        emojiName: "thumbsup",
+        fetchImpl: firstFetch,
+      }),
+    ).resolves.toEqual({ ok: true });
+
+    vi.spyOn(Date, "now").mockReturnValue(8_640_000_000_000_001);
+    await expect(
+      addMattermostReaction({
+        cfg,
+        postId: "POST2",
+        emojiName: "thumbsup",
+        fetchImpl: secondFetch,
+      }),
+    ).resolves.toEqual({ ok: true });
+
+    vi.mocked(Date.now).mockReturnValue(1_000);
+    await expect(
+      addMattermostReaction({
+        cfg,
+        postId: "POST3",
+        emojiName: "thumbsup",
+        fetchImpl: thirdFetch,
+      }),
+    ).resolves.toEqual({ ok: true });
+
+    const usersMeCalls = [
+      ...firstFetch.mock.calls,
+      ...secondFetch.mock.calls,
+      ...thirdFetch.mock.calls,
+    ].filter((call) => requestUrl(call[0]).endsWith("/api/v4/users/me"));
+    expect(usersMeCalls).toHaveLength(3);
+  });
+
+  it("does not cache bot user ids when cache expiry would exceed the Date range", async () => {
+    vi.spyOn(Date, "now").mockReturnValue(8_640_000_000_000_000);
+    const cfg = createMattermostTestConfig();
+    const fetchMock = createMattermostReactionFetchMock({
+      mode: "both",
+      postId: "POST1",
+      emojiName: "thumbsup",
+    });
+
+    await expect(
+      addMattermostReaction({
+        cfg,
+        postId: "POST1",
+        emojiName: "thumbsup",
+        fetchImpl: fetchMock,
+      }),
+    ).resolves.toEqual({ ok: true });
+    await expect(
+      removeMattermostReaction({
+        cfg,
+        postId: "POST1",
+        emojiName: "thumbsup",
+        fetchImpl: fetchMock,
+      }),
+    ).resolves.toEqual({ ok: true });
+
+    const usersMeCalls = fetchMock.mock.calls.filter((call) =>
+      requestUrl(call[0]).endsWith("/api/v4/users/me"),
+    );
+    expect(usersMeCalls).toHaveLength(2);
+  });
+});

extensions/mattermost/src/mattermost/reactions.ts

@@ -0,0 +1,144 @@
+// Mattermost plugin module implements reactions behavior.
+import {
+  asDateTimestampMs,
+  resolveExpiresAtMsFromDurationMs,
+} from "openclaw/plugin-sdk/number-runtime";
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostMe,
+  type MattermostClient,
+  type MattermostFetch,
+} from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+type Result = { ok: true } | { ok: false; error: string };
+type ReactionParams = {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+};
+type ReactionMutation = (client: MattermostClient, params: MutationPayload) => Promise<void>;
+type MutationPayload = { userId: string; postId: string; emojiName: string };
+
+const BOT_USER_CACHE_TTL_MS = 10 * 60_000;
+const botUserIdCache = new Map<string, { userId: string; expiresAt: number }>();
+
+async function resolveBotUserId(
+  client: MattermostClient,
+  cacheKey: string,
+): Promise<string | null> {
+  const rawNow = Date.now();
+  const now = asDateTimestampMs(rawNow);
+  const cached = botUserIdCache.get(cacheKey);
+  if (cached) {
+    if (now !== undefined && cached.expiresAt > now) {
+      return cached.userId;
+    }
+    botUserIdCache.delete(cacheKey);
+  }
+  const me = await fetchMattermostMe(client);
+  const userId = me?.id?.trim();
+  if (!userId) {
+    return null;
+  }
+  const expiresAt = resolveExpiresAtMsFromDurationMs(BOT_USER_CACHE_TTL_MS, { nowMs: rawNow });
+  if (expiresAt !== undefined) {
+    botUserIdCache.set(cacheKey, { userId, expiresAt });
+  }
+  return userId;
+}
+
+export async function addMattermostReaction(params: {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+}): Promise<Result> {
+  return runMattermostReaction(params, {
+    action: "add",
+    mutation: createReaction,
+  });
+}
+
+export async function removeMattermostReaction(params: {
+  cfg: OpenClawConfig;
+  postId: string;
+  emojiName: string;
+  accountId?: string | null;
+  fetchImpl?: MattermostFetch;
+}): Promise<Result> {
+  return runMattermostReaction(params, {
+    action: "remove",
+    mutation: deleteReaction,
+  });
+}
+
+export function resetMattermostReactionBotUserCacheForTests(): void {
+  botUserIdCache.clear();
+}
+
+async function runMattermostReaction(
+  params: ReactionParams,
+  options: {
+    action: "add" | "remove";
+    mutation: ReactionMutation;
+  },
+): Promise<Result> {
+  const resolved = resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId });
+  const baseUrl = resolved.baseUrl?.trim();
+  const botToken = resolved.botToken?.trim();
+  if (!baseUrl || !botToken) {
+    return { ok: false, error: "Mattermost botToken/baseUrl missing." };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken,
+    fetchImpl: params.fetchImpl,
+    allowPrivateNetwork: isPrivateNetworkOptInEnabled(resolved.config),
+  });
+
+  const cacheKey = `${baseUrl}:${botToken}`;
+  const userId = await resolveBotUserId(client, cacheKey);
+  if (!userId) {
+    return { ok: false, error: "Mattermost reactions failed: could not resolve bot user id." };
+  }
+
+  try {
+    await options.mutation(client, {
+      userId,
+      postId: params.postId,
+      emojiName: params.emojiName,
+    });
+  } catch (err) {
+    return { ok: false, error: `Mattermost ${options.action} reaction failed: ${String(err)}` };
+  }
+
+  return { ok: true };
+}
+
+async function createReaction(client: MattermostClient, params: MutationPayload): Promise<void> {
+  await client.request<Record<string, unknown>>("/reactions", {
+    method: "POST",
+    body: JSON.stringify({
+      user_id: params.userId,
+      post_id: params.postId,
+      emoji_name: params.emojiName,
+    }),
+  });
+}
+
+async function deleteReaction(client: MattermostClient, params: MutationPayload): Promise<void> {
+  const emoji = encodeURIComponent(params.emojiName);
+  await client.request<unknown>(
+    `/users/${params.userId}/posts/${params.postId}/reactions/${emoji}`,
+    {
+      method: "DELETE",
+    },
+  );
+}

extensions/mattermost/src/mattermost/reconnect.test.ts

@@ -0,0 +1,202 @@
+// Mattermost tests cover reconnect plugin behavior.
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { runWithReconnect } from "./reconnect.js";
+
+beforeEach(() => {
+  vi.restoreAllMocks();
+  vi.useFakeTimers();
+  vi.clearAllMocks();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.useRealTimers();
+});
+
+async function resolveReconnectRun(promise: Promise<void>): Promise<void> {
+  await vi.runAllTimersAsync();
+  await promise;
+}
+
+describe("runWithReconnect", () => {
+  it("retries after connectFn resolves (normal close)", async () => {
+    let callCount = 0;
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount >= 3) {
+        abort.abort();
+      }
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(3);
+  });
+
+  it("retries after connectFn throws (connection error)", async () => {
+    let callCount = 0;
+    const abort = new AbortController();
+    const onError = vi.fn();
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount < 3) {
+        throw new Error("fetch failed");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onError,
+      initialDelayMs: 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(3);
+    expect(onError).toHaveBeenCalledTimes(2);
+    expect(onError.mock.calls.map(([error]) => error)).toStrictEqual([
+      new Error("fetch failed"),
+      new Error("fetch failed"),
+    ]);
+  });
+
+  it("uses exponential backoff on consecutive errors, capped at maxDelayMs", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount >= 6) {
+        abort.abort();
+        return;
+      }
+      throw new Error("connection refused");
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 1,
+      maxDelayMs: 10,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(6);
+    expect(delays).toEqual([1, 2, 4, 8, 10]);
+  });
+
+  it("resets backoff after successful connection", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount === 1) {
+        throw new Error("first failure");
+      }
+      if (callCount === 2) {
+        return;
+      }
+      if (callCount === 3) {
+        throw new Error("second failure");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 1,
+      maxDelayMs: 60_000,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(4);
+    expect(delays).toEqual([1, 1, 1]);
+  });
+
+  it("stops immediately when abort signal is pre-fired", async () => {
+    const abort = new AbortController();
+    abort.abort();
+    const connectFn = vi.fn(async () => {});
+
+    await runWithReconnect(connectFn, { abortSignal: abort.signal });
+
+    expect(connectFn).not.toHaveBeenCalled();
+  });
+
+  it("stops after current connection when abort fires mid-connection", async () => {
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      abort.abort();
+    });
+
+    await runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 1,
+    });
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+  });
+
+  it("abort signal interrupts backoff sleep immediately", async () => {
+    const abort = new AbortController();
+    const connectFn = vi.fn(async () => {
+      setTimeout(() => abort.abort(), 10);
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      initialDelayMs: 60_000,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+  });
+
+  it("applies jitter to reconnect delay when configured", async () => {
+    const abort = new AbortController();
+    const delays: number[] = [];
+    let callCount = 0;
+    const connectFn = vi.fn(async () => {
+      callCount++;
+      if (callCount === 1) {
+        throw new Error("connection refused");
+      }
+      abort.abort();
+    });
+
+    const run = runWithReconnect(connectFn, {
+      abortSignal: abort.signal,
+      onReconnect: (delayMs) => delays.push(delayMs),
+      initialDelayMs: 10,
+      jitterRatio: 0.5,
+      random: () => 1,
+    });
+    await resolveReconnectRun(run);
+
+    expect(connectFn).toHaveBeenCalledTimes(2);
+    expect(delays).toEqual([15]);
+  });
+
+  it("supports strategy hook to stop reconnecting after failure", async () => {
+    const onReconnect = vi.fn();
+    const connectFn = vi.fn(async () => {
+      throw new Error("fatal");
+    });
+
+    await runWithReconnect(connectFn, {
+      initialDelayMs: 1,
+      onReconnect,
+      shouldReconnect: (params) => params.outcome !== "rejected",
+    });
+
+    expect(connectFn).toHaveBeenCalledTimes(1);
+    expect(onReconnect).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/reconnect.ts

@@ -0,0 +1,115 @@
+// Mattermost plugin module implements reconnect behavior.
+type ReconnectOutcome = "resolved" | "rejected";
+
+type ShouldReconnectParams = {
+  attempt: number;
+  delayMs: number;
+  outcome: ReconnectOutcome;
+  error?: unknown;
+};
+
+type RunWithReconnectOpts = {
+  abortSignal?: AbortSignal;
+  onError?: (err: unknown) => void;
+  onReconnect?: (delayMs: number) => void;
+  initialDelayMs?: number;
+  maxDelayMs?: number;
+  jitterRatio?: number;
+  random?: () => number;
+  shouldReconnect?: (params: ShouldReconnectParams) => boolean;
+};
+
+/**
+ * Reconnection loop with exponential backoff.
+ *
+ * Calls `connectFn` in a while loop. On normal resolve (connection closed),
+ * the backoff resets. On thrown error (connection failed), the current delay is
+ * used, then doubled for the next retry.
+ * The loop exits when `abortSignal` fires.
+ */
+export async function runWithReconnect(
+  connectFn: () => Promise<void>,
+  opts: RunWithReconnectOpts = {},
+): Promise<void> {
+  const { initialDelayMs = 2000, maxDelayMs = 60_000 } = opts;
+  const jitterRatio = Math.max(0, opts.jitterRatio ?? 0);
+  const random = opts.random ?? Math.random;
+  const backoff = createReconnectBackoff(initialDelayMs, maxDelayMs);
+  let attempt = 0;
+
+  while (!opts.abortSignal?.aborted) {
+    let outcome: ReconnectOutcome = "resolved";
+    let error: unknown;
+    try {
+      await connectFn();
+      backoff.reset();
+    } catch (err) {
+      if (opts.abortSignal?.aborted) {
+        return;
+      }
+      outcome = "rejected";
+      error = err;
+      opts.onError?.(err);
+    }
+    if (opts.abortSignal?.aborted) {
+      return;
+    }
+    const delayMs = withJitter(backoff.current(), jitterRatio, random);
+    const shouldReconnect =
+      opts.shouldReconnect?.({
+        attempt,
+        delayMs,
+        outcome,
+        error,
+      }) ?? true;
+    if (!shouldReconnect) {
+      return;
+    }
+    opts.onReconnect?.(delayMs);
+    await sleepAbortable(delayMs, opts.abortSignal);
+    if (outcome === "rejected") {
+      backoff.increase();
+    }
+    attempt++;
+  }
+}
+
+function createReconnectBackoff(initialDelayMs: number, maxDelayMs: number) {
+  let retryDelay = initialDelayMs;
+  return {
+    current: () => retryDelay,
+    reset: () => {
+      retryDelay = initialDelayMs;
+    },
+    increase: () => {
+      retryDelay = Math.min(retryDelay * 2, maxDelayMs);
+    },
+  };
+}
+
+function withJitter(baseMs: number, jitterRatio: number, random: () => number): number {
+  if (jitterRatio <= 0) {
+    return baseMs;
+  }
+  const normalized = Math.max(0, Math.min(1, random()));
+  const spread = baseMs * jitterRatio;
+  return Math.max(1, Math.round(baseMs - spread + normalized * spread * 2));
+}
+
+function sleepAbortable(ms: number, signal?: AbortSignal): Promise<void> {
+  return new Promise((resolve) => {
+    if (signal?.aborted) {
+      resolve();
+      return;
+    }
+    const onAbort = () => {
+      clearTimeout(timer);
+      resolve();
+    };
+    const timer = setTimeout(() => {
+      signal?.removeEventListener("abort", onAbort);
+      resolve();
+    }, ms);
+    signal?.addEventListener("abort", onAbort, { once: true });
+  });
+}

extensions/mattermost/src/mattermost/reply-delivery.test.ts

@@ -0,0 +1,312 @@
+// Mattermost tests cover reply delivery plugin behavior.
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import type { ChunkMode } from "openclaw/plugin-sdk/reply-runtime";
+import { describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig, PluginRuntime } from "../../runtime-api.js";
+import {
+  createMattermostReplyDeliveryBarrier,
+  deliverMattermostReplyPayload,
+} from "./reply-delivery.js";
+
+type DeliverMattermostReplyPayloadParams = Parameters<typeof deliverMattermostReplyPayload>[0];
+type ReplyDeliveryMarkdownTableMode = Parameters<
+  DeliverMattermostReplyPayloadParams["core"]["channel"]["text"]["convertMarkdownTables"]
+>[1];
+
+function createReplyDeliveryCore(): DeliverMattermostReplyPayloadParams["core"] {
+  return {
+    channel: {
+      text: {
+        chunkByNewline: vi.fn((text: string) => [text]),
+        chunkMarkdownText: vi.fn((text: string) => [text]),
+        convertMarkdownTables: vi.fn((text: string) => text),
+        chunkText: vi.fn((text: string) => [text]),
+        chunkTextWithMode: vi.fn((text: string) => [text]),
+        resolveMarkdownTableMode: vi.fn<() => ReplyDeliveryMarkdownTableMode>(() => "off"),
+        resolveChunkMode: vi.fn<() => ChunkMode>(() => "length"),
+        resolveTextChunkLimit: vi.fn(
+          (
+            _cfg?: OpenClawConfig,
+            _provider?: string,
+            _accountId?: string | null,
+            opts?: { fallbackLimit?: number },
+          ) => opts?.fallbackLimit ?? 4000,
+        ),
+        hasControlCommand: vi.fn(() => false),
+        chunkMarkdownTextWithMode: vi.fn((text: string) => [text]),
+      },
+    },
+  } as unknown as PluginRuntime;
+}
+
+describe("createMattermostReplyDeliveryBarrier", () => {
+  it("extends while direct deliveries or DM resolution remain unsettled", async () => {
+    const barrier = createMattermostReplyDeliveryBarrier({ isDirect: true });
+    const policy = barrier.resolveTimeoutPolicy({
+      queuedCounts: { tool: 1, block: 0, final: 1 },
+      humanDelayBudgetMs: 0,
+    });
+    expect(policy?.maxTimeoutMs).toBe(420_000);
+    expect(policy?.shouldExtend()).toBe(true);
+
+    let resolveResolution: () => void = () => {};
+    const resolution = new Promise<void>((resolve) => {
+      resolveResolution = resolve;
+    });
+    barrier.trackDmChannelResolution(resolution);
+    expect(policy?.shouldExtend()).toBe(true);
+
+    resolveResolution();
+    await resolution;
+    await Promise.resolve();
+    expect(policy?.shouldExtend()).toBe(true);
+
+    barrier.markDeliverySettled();
+    expect(policy?.shouldExtend()).toBe(true);
+
+    barrier.markDeliverySettled();
+    expect(policy?.shouldExtend()).toBe(false);
+  });
+
+  it("stays extended between failed retries until queued deliveries settle", async () => {
+    const barrier = createMattermostReplyDeliveryBarrier({ isDirect: true });
+    const policy = barrier.resolveTimeoutPolicy({
+      queuedCounts: { tool: 1, block: 0, final: 1 },
+      humanDelayBudgetMs: 0,
+    });
+    let rejectResolution: (error: Error) => void = () => {};
+    const resolution = new Promise<void>((_resolve, reject) => {
+      rejectResolution = reject;
+    });
+    barrier.trackDmChannelResolution(resolution);
+
+    rejectResolution(new Error("DM creation failed"));
+    await expect(resolution).rejects.toThrow("DM creation failed");
+    await Promise.resolve();
+    barrier.markDeliverySettled();
+    expect(policy?.shouldExtend()).toBe(true);
+
+    barrier.markDeliverySettled();
+    expect(policy?.shouldExtend()).toBe(false);
+  });
+
+  it("does not extend non-DM delivery", () => {
+    const barrier = createMattermostReplyDeliveryBarrier({ isDirect: false });
+    expect(
+      barrier.resolveTimeoutPolicy({
+        queuedCounts: { tool: 1, block: 1, final: 1 },
+        humanDelayBudgetMs: 0,
+      }),
+    ).toBeUndefined();
+  });
+});
+
+describe("deliverMattermostReplyPayload", () => {
+  it("suppresses payloads flagged as reasoning", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+
+    const outcome = await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "hidden", isReasoning: true },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).not.toHaveBeenCalled();
+    expect(outcome).toBe("reasoning_skipped");
+  });
+
+  it("returns 'empty' for substantive text that produced no send (regression: #80501)", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+    // Make the markdown table converter strip the text to empty so
+    // deliverTextOrMediaReply sees an empty chunked text and returns "empty".
+    core.channel.text.convertMarkdownTables = vi.fn(() => "");
+    core.channel.text.chunkMarkdownTextWithMode = vi.fn(() => []);
+
+    const outcome = await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "non-trivial input that the converter strips" },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).not.toHaveBeenCalled();
+    expect(outcome).toBe("empty");
+  });
+
+  it("suppresses reasoning-prefixed payloads even without an explicit flag", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+
+    await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "  \n Reasoning:\n_hidden_" },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).not.toHaveBeenCalled();
+  });
+
+  it("suppresses reasoning payloads formatted as a Mattermost blockquote", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+
+    await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "> Reasoning:\n> _hidden_" },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).not.toHaveBeenCalled();
+  });
+
+  it("does not suppress messages that mention Reasoning: mid-text", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+
+    await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "Intro line\nReasoning: appears in content but is not a prefix" },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).toHaveBeenCalledTimes(1);
+    expect(sendMessage).toHaveBeenCalledWith(
+      "channel:town-square",
+      "Intro line\nReasoning: appears in content but is not a prefix",
+      expect.objectContaining({
+        cfg,
+        accountId: "default",
+        replyToId: "root-post",
+      }),
+    );
+  });
+
+  it("passes agent-scoped mediaLocalRoots when sending media paths", async () => {
+    const previousStateDir = process.env.OPENCLAW_STATE_DIR;
+    const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-mm-state-"));
+    process.env.OPENCLAW_STATE_DIR = stateDir;
+
+    try {
+      const sendMessage = vi.fn(async () => undefined);
+      const core = createReplyDeliveryCore();
+
+      const agentId = "agent-1";
+      const mediaUrl = `file://${path.join(stateDir, `workspace-${agentId}`, "photo.png")}`;
+      const cfg = {} satisfies OpenClawConfig;
+
+      await deliverMattermostReplyPayload({
+        core,
+        cfg,
+        payload: { text: "caption", mediaUrl },
+        to: "channel:town-square",
+        accountId: "default",
+        agentId,
+        replyToId: "root-post",
+        textLimit: 4000,
+        tableMode: "off",
+        sendMessage,
+      });
+
+      expect(sendMessage).toHaveBeenCalledTimes(1);
+      expect(sendMessage).toHaveBeenCalledWith(
+        "channel:town-square",
+        "caption",
+        expect.objectContaining({
+          cfg,
+          accountId: "default",
+          mediaUrl,
+          replyToId: "root-post",
+          mediaLocalRoots: expect.arrayContaining([
+            path.join(stateDir, "media"),
+            path.join(stateDir, "canvas"),
+            path.join(stateDir, "workspace"),
+            path.join(stateDir, "sandboxes"),
+            path.join(stateDir, `workspace-${agentId}`),
+          ]),
+        }),
+      );
+    } finally {
+      if (previousStateDir === undefined) {
+        delete process.env.OPENCLAW_STATE_DIR;
+      } else {
+        process.env.OPENCLAW_STATE_DIR = previousStateDir;
+      }
+      await fs.rm(stateDir, { recursive: true, force: true });
+    }
+  });
+
+  it("forwards replyToId for text-only chunked replies", async () => {
+    const sendMessage = vi.fn(async () => undefined);
+    const cfg = {} satisfies OpenClawConfig;
+    const core = createReplyDeliveryCore();
+    core.channel.text.chunkMarkdownTextWithMode = vi.fn(() => ["hello"]);
+
+    const outcome = await deliverMattermostReplyPayload({
+      core,
+      cfg,
+      payload: { text: "hello" },
+      to: "channel:town-square",
+      accountId: "default",
+      agentId: "agent-1",
+      replyToId: "root-post",
+      textLimit: 4000,
+      tableMode: "off",
+      sendMessage,
+    });
+
+    expect(sendMessage).toHaveBeenCalledTimes(1);
+    expect(sendMessage).toHaveBeenCalledWith(
+      "channel:town-square",
+      "hello",
+      expect.objectContaining({
+        cfg,
+        accountId: "default",
+        replyToId: "root-post",
+      }),
+    );
+    expect(outcome).toBe("text");
+  });
+});

extensions/mattermost/src/mattermost/reply-delivery.ts

@@ -0,0 +1,147 @@
+// Mattermost plugin module implements reply delivery behavior.
+import type { OpenClawConfig, PluginRuntime } from "openclaw/plugin-sdk/core";
+import { getAgentScopedMediaLocalRoots } from "openclaw/plugin-sdk/media-runtime";
+import {
+  deliverTextOrMediaReply,
+  isReasoningReplyPayload,
+  resolveSendableOutboundReplyParts,
+} from "openclaw/plugin-sdk/reply-payload";
+import type {
+  ReplyDispatchKind,
+  ReplyFollowupAdmissionBarrierTimeoutPolicy,
+  ReplyPayload,
+} from "openclaw/plugin-sdk/reply-runtime";
+import {
+  resolveMattermostReplyDeliveryBarrierTimeoutMs,
+  type CreateDmChannelRetryOptions,
+} from "./client.js";
+
+type MarkdownTableMode = Parameters<PluginRuntime["channel"]["text"]["convertMarkdownTables"]>[1];
+
+type SendMattermostMessage = (
+  to: string,
+  text: string,
+  opts: {
+    cfg: OpenClawConfig;
+    accountId?: string;
+    mediaUrl?: string;
+    mediaLocalRoots?: readonly string[];
+    replyToId?: string;
+    onDmChannelResolution?: (resolution: PromiseLike<unknown>) => void;
+  },
+) => Promise<unknown>;
+
+export function createMattermostReplyDeliveryBarrier(params: {
+  isDirect: boolean;
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+}) {
+  let activeDmChannelResolutions = 0;
+  let queuedDeliveryCount = 0;
+  let settledDeliveryCount = 0;
+  const trackDmChannelResolution = (resolution: PromiseLike<unknown>) => {
+    activeDmChannelResolutions += 1;
+    void Promise.resolve(resolution).then(
+      () => {
+        activeDmChannelResolutions -= 1;
+      },
+      () => {
+        activeDmChannelResolutions -= 1;
+      },
+    );
+  };
+  const markDeliverySettled = () => {
+    settledDeliveryCount += 1;
+  };
+  const resolveTimeoutPolicy = (context: {
+    queuedCounts: Readonly<Record<ReplyDispatchKind, number>>;
+    humanDelayBudgetMs: number;
+  }): ReplyFollowupAdmissionBarrierTimeoutPolicy | undefined => {
+    const { queuedCounts } = context;
+    queuedDeliveryCount = Object.values(queuedCounts).reduce((sum, count) => sum + count, 0);
+    const maxTimeoutMs = resolveMattermostReplyDeliveryBarrierTimeoutMs({
+      isDirect: params.isDirect,
+      dmRetryOptions: params.dmRetryOptions,
+      queuedCounts,
+      humanDelayBudgetMs: context.humanDelayBudgetMs,
+    });
+    if (maxTimeoutMs === undefined) {
+      return undefined;
+    }
+    return {
+      maxTimeoutMs,
+      shouldExtend: () =>
+        activeDmChannelResolutions > 0 || settledDeliveryCount < queuedDeliveryCount,
+    };
+  };
+  return {
+    trackDmChannelResolution,
+    markDeliverySettled,
+    resolveTimeoutPolicy,
+  };
+}
+
+/**
+ * Result of `deliverMattermostReplyPayload`. Callers in `monitor.ts` use this
+ * to distinguish a successful visible send from an intentionally suppressed
+ * reasoning payload from a substantive payload that ended up sending nothing
+ * (the silent-completion symptom in #80501).
+ */
+export type MattermostReplyDeliveryOutcome = "reasoning_skipped" | "empty" | "text" | "media";
+
+export async function deliverMattermostReplyPayload(params: {
+  core: PluginRuntime;
+  cfg: OpenClawConfig;
+  payload: ReplyPayload;
+  to: string;
+  accountId: string;
+  agentId?: string;
+  replyToId?: string;
+  textLimit: number;
+  tableMode: MarkdownTableMode;
+  sendMessage: SendMattermostMessage;
+  onDmChannelResolution?: (resolution: PromiseLike<unknown>) => void;
+}): Promise<MattermostReplyDeliveryOutcome> {
+  if (isReasoningReplyPayload(params.payload)) {
+    return "reasoning_skipped";
+  }
+  const reply = resolveSendableOutboundReplyParts(params.payload, {
+    text: params.core.channel.text.convertMarkdownTables(
+      params.payload.text ?? "",
+      params.tableMode,
+    ),
+  });
+  const mediaLocalRoots = getAgentScopedMediaLocalRoots(params.cfg, params.agentId);
+  const chunkMode = params.core.channel.text.resolveChunkMode(
+    params.cfg,
+    "mattermost",
+    params.accountId,
+  );
+  return await deliverTextOrMediaReply({
+    payload: params.payload,
+    text: reply.text,
+    chunkText: (value) =>
+      params.core.channel.text.chunkMarkdownTextWithMode(value, params.textLimit, chunkMode),
+    sendText: async (chunk) => {
+      await params.sendMessage(params.to, chunk, {
+        cfg: params.cfg,
+        accountId: params.accountId,
+        replyToId: params.replyToId,
+        ...(params.onDmChannelResolution
+          ? { onDmChannelResolution: params.onDmChannelResolution }
+          : {}),
+      });
+    },
+    sendMedia: async ({ mediaUrl, caption }) => {
+      await params.sendMessage(params.to, caption ?? "", {
+        cfg: params.cfg,
+        accountId: params.accountId,
+        mediaUrl,
+        mediaLocalRoots,
+        replyToId: params.replyToId,
+        ...(params.onDmChannelResolution
+          ? { onDmChannelResolution: params.onDmChannelResolution }
+          : {}),
+      });
+    },
+  });
+}

extensions/mattermost/src/mattermost/runtime-api.ts

@@ -0,0 +1,51 @@
+// Mattermost API module exposes the plugin public contract.
+export type {
+  BaseProbeResult,
+  ChannelAccountSnapshot,
+  ChannelDirectoryEntry,
+  ChatType,
+  HistoryEntry,
+  OpenClawConfig,
+  OpenClawPluginApi,
+  ReplyPayload,
+} from "openclaw/plugin-sdk/core";
+export type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
+export { buildAgentMediaPayload } from "openclaw/plugin-sdk/agent-media-payload";
+export { resolveAllowlistMatchSimple } from "openclaw/plugin-sdk/allow-from";
+export { logInboundDrop } from "openclaw/plugin-sdk/channel-inbound";
+export { createChannelPairingController } from "openclaw/plugin-sdk/channel-pairing";
+export { createChannelMessageReplyPipeline } from "openclaw/plugin-sdk/channel-outbound";
+export { logTypingFailure } from "openclaw/plugin-sdk/channel-feedback";
+export {
+  listSkillCommandsForAgents,
+  resolveControlCommandGate,
+} from "openclaw/plugin-sdk/command-auth-native";
+export { buildModelsProviderData } from "openclaw/plugin-sdk/models-provider-runtime";
+export { isDangerousNameMatchingEnabled } from "openclaw/plugin-sdk/dangerous-name-runtime";
+export {
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveDefaultGroupPolicy,
+  warnMissingProviderGroupPolicyFallbackOnce,
+} from "openclaw/plugin-sdk/runtime-group-policy";
+export { resolveChannelMediaMaxBytes } from "openclaw/plugin-sdk/media-runtime";
+export { loadOutboundMediaFromUrl } from "openclaw/plugin-sdk/outbound-media";
+// Legacy map-helper exports stay for older plugin consumers. New message-turn
+// code should use createChannelHistoryWindow.
+export {
+  DEFAULT_GROUP_HISTORY_LIMIT,
+  createChannelHistoryWindow,
+  buildInboundHistoryFromMap,
+  buildPendingHistoryContextFromMap,
+  recordPendingHistoryEntryIfEnabled,
+} from "openclaw/plugin-sdk/reply-history";
+export { registerPluginHttpRoute } from "openclaw/plugin-sdk/webhook-targets";
+export {
+  isRequestBodyLimitError,
+  readRequestBodyWithLimit,
+} from "openclaw/plugin-sdk/webhook-ingress";
+export {
+  isTrustedProxyAddress,
+  parseStrictPositiveInteger,
+  resolveClientIp,
+} from "openclaw/plugin-sdk/core";
+export { parseTcpPort } from "openclaw/plugin-sdk/number-runtime";

extensions/mattermost/src/mattermost/send.test.ts

@@ -0,0 +1,746 @@
+// Mattermost tests cover send plugin behavior.
+import { expectProvidedCfgSkipsRuntimeLoad } from "openclaw/plugin-sdk/channel-test-helpers";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+let parseMattermostTarget: typeof import("./send.js").parseMattermostTarget;
+let sendMessageMattermost: typeof import("./send.js").sendMessageMattermost;
+let resetMattermostOpaqueTargetCacheForTests: typeof import("./target-resolution.js").resetMattermostOpaqueTargetCacheForTests;
+
+type SendMessageMattermostOptions = NonNullable<
+  Parameters<typeof import("./send.js").sendMessageMattermost>[2]
+>;
+
+const TEST_CFG = {};
+
+const mockState = vi.hoisted(() => ({
+  loadConfig: vi.fn(() => ({})),
+  loadOutboundMediaFromUrl: vi.fn(),
+  recordActivity: vi.fn(),
+  resolveMattermostAccount: vi.fn(() => ({
+    accountId: "default",
+    botToken: "bot-token",
+    baseUrl: "https://mattermost.example.com",
+    config: {},
+  })),
+  createMattermostClient: vi.fn(),
+  createMattermostDirectChannel: vi.fn(),
+  createMattermostDirectChannelWithRetry: vi.fn(),
+  createMattermostPost: vi.fn(),
+  fetchMattermostChannelByName: vi.fn(),
+  fetchMattermostMe: vi.fn(),
+  fetchMattermostUser: vi.fn(),
+  fetchMattermostUserTeams: vi.fn(),
+  fetchMattermostUserByUsername: vi.fn(),
+  normalizeMattermostBaseUrl: vi.fn((input: string | undefined) => input?.trim() ?? ""),
+  uploadMattermostFile: vi.fn(),
+}));
+
+type MattermostPostParams = {
+  channelId?: string;
+  message?: string;
+  props?: {
+    attachments?: Array<{
+      actions?: Array<{ id?: string; name?: string }>;
+    }>;
+  };
+};
+
+type MattermostUploadParams = {
+  channelId?: string;
+  fileName?: string;
+  contentType?: string;
+};
+
+type MattermostDirectRetryOptions = {
+  maxRetries?: number;
+  initialDelayMs?: number;
+  maxDelayMs?: number;
+  timeoutMs?: number;
+  onRetry?: () => void;
+};
+
+function mockCall(mock: unknown, label: string, index = 0): unknown[] {
+  const calls = (mock as { mock?: { calls?: unknown[][] } }).mock?.calls;
+  const call = calls?.at(index);
+  if (!call) {
+    throw new Error(`Expected ${label} call ${index + 1}`);
+  }
+  return call;
+}
+
+function uploadMattermostFileCall() {
+  return mockCall(mockState.uploadMattermostFile, "uploadMattermostFile") as [
+    unknown,
+    MattermostUploadParams?,
+  ];
+}
+
+function createMattermostPostParams() {
+  const params = mockCall(mockState.createMattermostPost, "createMattermostPost")[1] as
+    | MattermostPostParams
+    | undefined;
+  if (!params) {
+    throw new Error("Expected createMattermostPost params");
+  }
+  return params;
+}
+
+function createMattermostPostCall() {
+  return mockCall(mockState.createMattermostPost, "createMattermostPost") as [
+    unknown,
+    MattermostPostParams?,
+  ];
+}
+
+function directChannelRetryCall() {
+  return mockCall(
+    mockState.createMattermostDirectChannelWithRetry,
+    "createMattermostDirectChannelWithRetry",
+  ) as [unknown, unknown, MattermostDirectRetryOptions?];
+}
+
+vi.mock("../../runtime-api.js", () => ({
+  loadOutboundMediaFromUrl: mockState.loadOutboundMediaFromUrl,
+}));
+
+vi.mock("./runtime-api.js", () => ({
+  loadOutboundMediaFromUrl: mockState.loadOutboundMediaFromUrl,
+}));
+
+vi.mock("openclaw/plugin-sdk/plugin-config-runtime", () => ({
+  requireRuntimeConfig: (cfg: unknown) => {
+    if (cfg) {
+      return cfg;
+    }
+    throw new Error("Mattermost send requires a resolved runtime config");
+  },
+  resolveMarkdownTableMode: vi.fn(() => "off"),
+}));
+
+vi.mock("openclaw/plugin-sdk/text-chunking", () => ({
+  convertMarkdownTables: vi.fn((text: string) => text),
+}));
+
+vi.mock("openclaw/plugin-sdk/string-coerce-runtime", () => ({
+  normalizeLowercaseStringOrEmpty: vi.fn((value: string | null | undefined) => {
+    if (typeof value !== "string") {
+      return "";
+    }
+    return value.trim().toLowerCase();
+  }),
+  normalizeOptionalString: vi.fn((value: string | null | undefined) => {
+    if (typeof value !== "string") {
+      return undefined;
+    }
+    const normalized = value.trim();
+    return normalized.length > 0 ? normalized : undefined;
+  }),
+  normalizeStringifiedOptionalString: vi.fn((value: unknown) => {
+    if (typeof value === "string") {
+      const normalized = value.trim();
+      return normalized.length > 0 ? normalized : undefined;
+    }
+    if (typeof value === "number" || typeof value === "boolean" || typeof value === "bigint") {
+      const normalized = String(value).trim();
+      return normalized.length > 0 ? normalized : undefined;
+    }
+    return undefined;
+  }),
+}));
+
+vi.mock("./accounts.js", () => ({
+  resolveMattermostAccount: mockState.resolveMattermostAccount,
+}));
+
+vi.mock("./client.js", () => ({
+  createMattermostClient: mockState.createMattermostClient,
+  createMattermostDirectChannel: mockState.createMattermostDirectChannel,
+  createMattermostDirectChannelWithRetry: mockState.createMattermostDirectChannelWithRetry,
+  createMattermostPost: mockState.createMattermostPost,
+  fetchMattermostChannelByName: mockState.fetchMattermostChannelByName,
+  fetchMattermostMe: mockState.fetchMattermostMe,
+  fetchMattermostUser: mockState.fetchMattermostUser,
+  fetchMattermostUserTeams: mockState.fetchMattermostUserTeams,
+  fetchMattermostUserByUsername: mockState.fetchMattermostUserByUsername,
+  normalizeMattermostBaseUrl: mockState.normalizeMattermostBaseUrl,
+  uploadMattermostFile: mockState.uploadMattermostFile,
+}));
+
+vi.mock("../runtime.js", () => ({
+  getMattermostRuntime: () => ({
+    config: {
+      loadConfig: mockState.loadConfig,
+    },
+    logging: {
+      shouldLogVerbose: () => false,
+      getChildLogger: () => ({ debug: vi.fn(), info: vi.fn(), warn: vi.fn(), error: vi.fn() }),
+    },
+    channel: {
+      text: {
+        resolveMarkdownTableMode: () => "off",
+        convertMarkdownTables: (text: string) => text,
+      },
+      activity: {
+        record: mockState.recordActivity,
+      },
+    },
+  }),
+}));
+
+describe("sendMessageMattermost", () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    mockState.loadConfig.mockReset();
+    mockState.loadConfig.mockReturnValue({});
+    mockState.recordActivity.mockReset();
+    mockState.resolveMattermostAccount.mockReset();
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.loadOutboundMediaFromUrl.mockReset();
+    mockState.createMattermostClient.mockReset();
+    mockState.createMattermostDirectChannel.mockReset();
+    mockState.createMattermostDirectChannelWithRetry.mockReset();
+    mockState.createMattermostPost.mockReset();
+    mockState.fetchMattermostChannelByName.mockReset();
+    mockState.fetchMattermostMe.mockReset();
+    mockState.fetchMattermostUser.mockReset();
+    mockState.fetchMattermostUserTeams.mockReset();
+    mockState.fetchMattermostUserByUsername.mockReset();
+    mockState.uploadMattermostFile.mockReset();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-1" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-1" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-user" });
+    mockState.fetchMattermostUserTeams.mockResolvedValue([{ id: "team-1" }]);
+    mockState.fetchMattermostChannelByName.mockResolvedValue({ id: "town-square" });
+    mockState.uploadMattermostFile.mockResolvedValue({ id: "file-1" });
+    ({ parseMattermostTarget, sendMessageMattermost } = await import("./send.js"));
+    ({ resetMattermostOpaqueTargetCacheForTests } = await import("./target-resolution.js"));
+    resetMattermostOpaqueTargetCacheForTests();
+  });
+
+  it("uses provided cfg and skips runtime loadConfig", async () => {
+    const providedCfg = {
+      channels: {
+        mattermost: {
+          botToken: "provided-token",
+        },
+      },
+    };
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "work",
+      botToken: "provided-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    const options: SendMessageMattermostOptions = {
+      cfg: providedCfg,
+      accountId: "work",
+    };
+
+    await sendMessageMattermost("channel:town-square", "hello", {
+      ...options,
+    });
+
+    expectProvidedCfgSkipsRuntimeLoad({
+      loadConfig: mockState.loadConfig,
+      resolveAccount: mockState.resolveMattermostAccount,
+      cfg: providedCfg,
+      accountId: "work",
+    });
+  });
+
+  it("fails hard when cfg is omitted", async () => {
+    await expect(
+      sendMessageMattermost("channel:town-square", "hello", undefined as never),
+    ).rejects.toThrow("Mattermost send requires a resolved runtime config");
+    expect(mockState.loadConfig).not.toHaveBeenCalled();
+    expect(mockState.resolveMattermostAccount).not.toHaveBeenCalled();
+  });
+
+  it("sends with provided cfg even when the runtime store is not initialized", async () => {
+    const providedCfg = {
+      channels: {
+        mattermost: {
+          botToken: "provided-token",
+        },
+      },
+    };
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "work",
+      botToken: "provided-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.recordActivity.mockImplementation(() => {
+      throw new Error("Mattermost runtime not initialized");
+    });
+
+    const result = await sendMessageMattermost("channel:town-square", "hello", {
+      cfg: providedCfg,
+      accountId: "work",
+    });
+
+    expect(result.messageId).toBe("post-1");
+    expect(result.channelId).toBe("town-square");
+    expect(result.receipt.primaryPlatformMessageId).toBe("post-1");
+    expect(result.receipt.platformMessageIds).toEqual(["post-1"]);
+    expect(result.receipt.parts).toHaveLength(1);
+    expect(result.receipt.parts[0]?.platformMessageId).toBe("post-1");
+    expect(result.receipt.parts[0]?.kind).toBe("text");
+    expect(mockState.loadConfig).not.toHaveBeenCalled();
+  });
+
+  it("loads outbound media with trusted local roots before upload", async () => {
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await sendMessageMattermost("channel:town-square", "hello", {
+      cfg: TEST_CFG,
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+      workspaceDir: "/tmp/agent-workspace",
+    });
+
+    expect(mockState.loadOutboundMediaFromUrl).toHaveBeenCalledWith(
+      "file:///tmp/agent-workspace/photo.png",
+      {
+        mediaLocalRoots: ["/tmp/agent-workspace"],
+        workspaceDir: "/tmp/agent-workspace",
+      },
+    );
+    const uploadCall = uploadMattermostFileCall();
+    expect(uploadCall?.[0]).toEqual({});
+    expect(uploadCall?.[1]?.channelId).toBe("town-square");
+    expect(uploadCall?.[1]?.fileName).toBe("photo.png");
+    expect(uploadCall?.[1]?.contentType).toBe("image/png");
+  });
+
+  it("fails instead of posting text-only when required media cannot be loaded", async () => {
+    mockState.loadOutboundMediaFromUrl.mockRejectedValueOnce(new Error("local root denied"));
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await expect(
+      sendMessageMattermost("channel:town-square", "hello", {
+        cfg: TEST_CFG,
+        mediaUrl: "file:///tmp/agent-workspace/photo.png",
+        mediaLocalRoots: ["/tmp/agent-workspace"],
+        requireMediaUpload: true,
+      }),
+    ).rejects.toThrow("Mattermost media upload failed: local root denied");
+
+    expect(mockState.createMattermostPost).not.toHaveBeenCalled();
+  });
+
+  it("builds interactive button props when buttons are provided", async () => {
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+
+    await sendMessageMattermost("channel:town-square", "Pick a model", {
+      cfg: TEST_CFG,
+      buttons: [[{ callback_data: "mdlprov", text: "Browse providers" }]],
+    });
+
+    const postCall = createMattermostPostCall();
+    expect(postCall?.[0]).toEqual({});
+    expect(postCall?.[1]?.channelId).toBe("town-square");
+    expect(postCall?.[1]?.message).toBe("Pick a model");
+    const attachments = postCall?.[1]?.props?.attachments;
+    expect(Array.isArray(attachments)).toBe(true);
+    const actions = attachments?.[0]?.actions;
+    expect(Array.isArray(actions)).toBe(true);
+    expect(actions?.[0]?.id).toBe("mdlprov");
+    expect(actions?.[0]?.name).toBe("Browse providers");
+  });
+
+  it("resolves a bare Mattermost user id as a DM target before upload", async () => {
+    const userId = "dthcxgoxhifn3pwh65cut3ud3w";
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+
+    const result = await sendMessageMattermost(userId, "hello", {
+      cfg: TEST_CFG,
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+    });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledWith({}, userId);
+    const dmRetryCall = directChannelRetryCall();
+    expect(dmRetryCall?.[0]).toEqual({});
+    expect(dmRetryCall?.[1]).toEqual(["bot-user", userId]);
+    expect(Object.keys(dmRetryCall?.[2] ?? {})).toEqual(["onRetry"]);
+    expect(dmRetryCall?.[2]?.onRetry).toBeTypeOf("function");
+    const uploadCall = uploadMattermostFileCall();
+    expect(uploadCall?.[0]).toEqual({});
+    expect(uploadCall?.[1]?.channelId).toBe("dm-channel-1");
+    expect(result.channelId).toBe("dm-channel-1");
+  });
+
+  it("falls back to a channel target when bare Mattermost id is not a user", async () => {
+    const channelId = "aaaaaaaaaaaaaaaaaaaaaaaaaa";
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "bot-token",
+      baseUrl: "https://mattermost.example.com",
+      config: {},
+    });
+    mockState.fetchMattermostUser.mockRejectedValueOnce(
+      new Error("Mattermost API 404 Not Found: user not found"),
+    );
+    mockState.loadOutboundMediaFromUrl.mockResolvedValueOnce({
+      buffer: Buffer.from("media-bytes"),
+      fileName: "photo.png",
+      contentType: "image/png",
+      kind: "image",
+    });
+
+    const result = await sendMessageMattermost(channelId, "hello", {
+      cfg: TEST_CFG,
+      mediaUrl: "file:///tmp/agent-workspace/photo.png",
+      mediaLocalRoots: ["/tmp/agent-workspace"],
+    });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledWith({}, channelId);
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    const uploadCall = uploadMattermostFileCall();
+    expect(uploadCall?.[0]).toEqual({});
+    expect(uploadCall?.[1]?.channelId).toBe(channelId);
+    expect(result.channelId).toBe(channelId);
+  });
+});
+
+describe("parseMattermostTarget", () => {
+  it("parses channel: prefix with valid ID as channel id", () => {
+    const target = parseMattermostTarget("channel:dthcxgoxhifn3pwh65cut3ud3w");
+    expect(target).toEqual({ kind: "channel", id: "dthcxgoxhifn3pwh65cut3ud3w" });
+  });
+
+  it("parses channel: prefix with non-ID as channel name", () => {
+    const target = parseMattermostTarget("channel:abc123");
+    expect(target).toEqual({ kind: "channel-name", name: "abc123" });
+  });
+
+  it("parses user: prefix as user id", () => {
+    const target = parseMattermostTarget("user:usr456");
+    expect(target).toEqual({ kind: "user", id: "usr456" });
+  });
+
+  it("parses mattermost: prefix as user id", () => {
+    const target = parseMattermostTarget("mattermost:usr789");
+    expect(target).toEqual({ kind: "user", id: "usr789" });
+  });
+
+  it("parses @ prefix as username", () => {
+    const target = parseMattermostTarget("@alice");
+    expect(target).toEqual({ kind: "user", username: "alice" });
+  });
+
+  it("parses # prefix as channel name", () => {
+    const target = parseMattermostTarget("#off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("parses # prefix with spaces", () => {
+    const target = parseMattermostTarget("  #general  ");
+    expect(target).toEqual({ kind: "channel-name", name: "general" });
+  });
+
+  it("treats 26-char alphanumeric bare string as channel id", () => {
+    const target = parseMattermostTarget("dthcxgoxhifn3pwh65cut3ud3w");
+    expect(target).toEqual({ kind: "channel", id: "dthcxgoxhifn3pwh65cut3ud3w" });
+  });
+
+  it("treats non-ID bare string as channel name", () => {
+    const target = parseMattermostTarget("off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("treats channel: with non-ID value as channel name", () => {
+    const target = parseMattermostTarget("channel:off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("throws on empty string", () => {
+    expect(() => parseMattermostTarget("")).toThrow("Recipient is required");
+  });
+
+  it("throws on empty # prefix", () => {
+    expect(() => parseMattermostTarget("#")).toThrow("Channel name is required");
+  });
+
+  it("throws on empty @ prefix", () => {
+    expect(() => parseMattermostTarget("@")).toThrow("Username is required");
+  });
+
+  it("parses channel:#name as channel name", () => {
+    const target = parseMattermostTarget("channel:#off-topic");
+    expect(target).toEqual({ kind: "channel-name", name: "off-topic" });
+  });
+
+  it("parses channel:#name with spaces", () => {
+    const target = parseMattermostTarget("  channel: #general  ");
+    expect(target).toEqual({ kind: "channel-name", name: "general" });
+  });
+
+  it("is case-insensitive for prefixes", () => {
+    expect(parseMattermostTarget("CHANNEL:dthcxgoxhifn3pwh65cut3ud3w")).toEqual({
+      kind: "channel",
+      id: "dthcxgoxhifn3pwh65cut3ud3w",
+    });
+    expect(parseMattermostTarget("User:XYZ")).toEqual({ kind: "user", id: "XYZ" });
+    expect(parseMattermostTarget("Mattermost:QRS")).toEqual({ kind: "user", id: "QRS" });
+  });
+});
+
+// Each test uses a unique (token, id) pair to avoid module-level cache collisions.
+// userIdResolutionCache and dmChannelCache are module singletons that survive across tests.
+// Using unique cache keys per test ensures full isolation without needing a cache reset API.
+describe("sendMessageMattermost user-first resolution", () => {
+  function makeAccount(token: string, config = {}) {
+    return {
+      accountId: "default",
+      botToken: token,
+      baseUrl: "https://mattermost.example.com",
+      config,
+    };
+  }
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-id" });
+    mockState.createMattermostDirectChannel.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-id" });
+  });
+
+  it("resolves unprefixed 26-char id as user and sends via DM channel", async () => {
+    // Unique token + id to avoid cache pollution from other tests
+    const userId = "aaaaaa1111111111aaaaaa1111"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-user-dm-t1"));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const res = await sendMessageMattermost(userId, "hello", { cfg: TEST_CFG });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledTimes(1);
+    const params = createMattermostPostParams();
+    expect(params.channelId).toBe("dm-channel-id");
+    expect(res.channelId).toBe("dm-channel-id");
+    expect(res.messageId).toBe("post-id");
+    expect(res.receipt.primaryPlatformMessageId).toBe("post-id");
+    expect(res.receipt.platformMessageIds).toEqual(["post-id"]);
+  });
+
+  it("falls back to channel id when user lookup returns 404", async () => {
+    // Unique token + id for this test
+    const channelId = "bbbbbb2222222222bbbbbb2222"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-404-t2"));
+    const err = new Error("Mattermost API 404: user not found");
+    mockState.fetchMattermostUser.mockRejectedValueOnce(err);
+
+    const res = await sendMessageMattermost(channelId, "hello", { cfg: TEST_CFG });
+
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    const params = createMattermostPostParams();
+    expect(params.channelId).toBe(channelId);
+    expect(res.channelId).toBe(channelId);
+  });
+
+  it("falls back to channel id without caching negative result on transient error", async () => {
+    // Two unique tokens so each call has its own cache namespace
+    const userId = "cccccc3333333333cccccc3333"; // 26 chars
+    const tokenA = "token-transient-t3a";
+    const tokenB = "token-transient-t3b";
+    const transientErr = new Error("Mattermost API 503: service unavailable");
+
+    // First call: transient error → fall back to channel id, do NOT cache negative
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount(tokenA));
+    mockState.fetchMattermostUser.mockRejectedValueOnce(transientErr);
+
+    const res1 = await sendMessageMattermost(userId, "first", { cfg: TEST_CFG });
+    expect(res1.channelId).toBe(userId);
+
+    // Second call with a different token (new cache key) → retries user lookup
+    vi.clearAllMocks();
+    mockState.createMattermostClient.mockReturnValue({});
+    mockState.createMattermostPost.mockResolvedValue({ id: "post-id-2" });
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+    mockState.fetchMattermostMe.mockResolvedValue({ id: "bot-id" });
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount(tokenB));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const res2 = await sendMessageMattermost(userId, "second", { cfg: TEST_CFG });
+    expect(mockState.fetchMattermostUser).toHaveBeenCalledTimes(1);
+    expect(res2.channelId).toBe("dm-channel-id");
+  });
+
+  it("does not apply user-first resolution for explicit user: prefix", async () => {
+    // Unique token + id — explicit user: prefix bypasses probe, goes straight to DM
+    const userId = "dddddd4444444444dddddd4444"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-explicit-user-t4"));
+    mockState.createMattermostDirectChannelWithRetry.mockResolvedValue({ id: "dm-channel-id" });
+
+    const res = await sendMessageMattermost(`user:${userId}`, "hello", { cfg: TEST_CFG });
+
+    expect(mockState.fetchMattermostUser).not.toHaveBeenCalled();
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledTimes(1);
+    expect(res.channelId).toBe("dm-channel-id");
+  });
+
+  it("observes cache-miss DM resolution but not cached sends", async () => {
+    const userId = "iiiiii9999999999iiiiii9999"; // 26 chars
+    const onDmChannelResolution = vi.fn();
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-dm-observer-t9"));
+
+    await sendMessageMattermost(`user:${userId}`, "first", {
+      cfg: TEST_CFG,
+      onDmChannelResolution,
+    });
+    await sendMessageMattermost(`user:${userId}`, "second", {
+      cfg: TEST_CFG,
+      onDmChannelResolution,
+    });
+
+    expect(onDmChannelResolution).toHaveBeenCalledTimes(1);
+    expect(onDmChannelResolution).toHaveBeenCalledWith(expect.any(Promise));
+    expect(mockState.createMattermostDirectChannelWithRetry).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not apply user-first resolution for explicit channel: prefix", async () => {
+    // Unique token + id — explicit channel: prefix, no probe, no DM
+    const chanId = "eeeeee5555555555eeeeee5555"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-explicit-chan-t5"));
+
+    const res = await sendMessageMattermost(`channel:${chanId}`, "hello", { cfg: TEST_CFG });
+
+    expect(mockState.fetchMattermostUser).not.toHaveBeenCalled();
+    expect(mockState.createMattermostDirectChannelWithRetry).not.toHaveBeenCalled();
+    const params = createMattermostPostParams();
+    expect(params.channelId).toBe(chanId);
+    expect(res.channelId).toBe(chanId);
+  });
+
+  it("passes dmRetryOptions from opts to createMattermostDirectChannelWithRetry", async () => {
+    const userId = "ffffff6666666666ffffff6666"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue(makeAccount("token-retry-opts-t6"));
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const retryOptions = {
+      maxRetries: 5,
+      initialDelayMs: 500,
+      maxDelayMs: 5000,
+      timeoutMs: 10000,
+    };
+
+    await sendMessageMattermost(`user:${userId}`, "hello", {
+      cfg: TEST_CFG,
+      dmRetryOptions: retryOptions,
+    });
+
+    const retryCall = directChannelRetryCall();
+    expect(retryCall?.[0]).toEqual({});
+    expect(retryCall?.[1]).toEqual(["bot-id", userId]);
+    expect(retryCall?.[2]?.maxRetries).toBe(retryOptions.maxRetries);
+    expect(retryCall?.[2]?.initialDelayMs).toBe(retryOptions.initialDelayMs);
+    expect(retryCall?.[2]?.maxDelayMs).toBe(retryOptions.maxDelayMs);
+    expect(retryCall?.[2]?.timeoutMs).toBe(retryOptions.timeoutMs);
+  });
+
+  it("uses dmChannelRetry from account config when opts.dmRetryOptions not provided", async () => {
+    const userId = "gggggg7777777777gggggg7777"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "token-retry-config-t7",
+      baseUrl: "https://mattermost.example.com",
+      config: {
+        dmChannelRetry: {
+          maxRetries: 4,
+          initialDelayMs: 2000,
+          maxDelayMs: 8000,
+          timeoutMs: 15000,
+        },
+      },
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    await sendMessageMattermost(`user:${userId}`, "hello", { cfg: TEST_CFG });
+
+    const retryCall = directChannelRetryCall();
+    expect(retryCall?.[0]).toEqual({});
+    expect(retryCall?.[1]).toEqual(["bot-id", userId]);
+    expect(retryCall?.[2]?.maxRetries).toBe(4);
+    expect(retryCall?.[2]?.initialDelayMs).toBe(2000);
+    expect(retryCall?.[2]?.maxDelayMs).toBe(8000);
+    expect(retryCall?.[2]?.timeoutMs).toBe(15000);
+  });
+
+  it("opts.dmRetryOptions overrides provided fields and preserves account defaults", async () => {
+    const userId = "hhhhhh8888888888hhhhhh8888"; // 26 chars
+    mockState.resolveMattermostAccount.mockReturnValue({
+      accountId: "default",
+      botToken: "token-retry-override-t8",
+      baseUrl: "https://mattermost.example.com",
+      config: {
+        dmChannelRetry: {
+          maxRetries: 2,
+          initialDelayMs: 1000,
+        },
+      },
+    });
+    mockState.fetchMattermostUser.mockResolvedValueOnce({ id: userId });
+
+    const overrideOptions = {
+      maxRetries: 7,
+      timeoutMs: 20000,
+    };
+
+    await sendMessageMattermost(`user:${userId}`, "hello", {
+      cfg: TEST_CFG,
+      dmRetryOptions: overrideOptions,
+    });
+
+    const retryCall = directChannelRetryCall();
+    expect(retryCall?.[0]).toEqual({});
+    expect(retryCall?.[1]).toEqual(["bot-id", userId]);
+    expect(retryCall?.[2]?.maxRetries).toBe(overrideOptions.maxRetries);
+    expect(retryCall?.[2]?.timeoutMs).toBe(overrideOptions.timeoutMs);
+    expect(retryCall?.[2]?.initialDelayMs).toBe(1000);
+  });
+});

extensions/mattermost/src/mattermost/send.ts

@@ -0,0 +1,538 @@
+// Mattermost plugin module implements send behavior.
+import {
+  createMessageReceiptFromOutboundResults,
+  type MessageReceipt,
+  type MessageReceiptPartKind,
+} from "openclaw/plugin-sdk/channel-outbound";
+import { resolveMarkdownTableMode } from "openclaw/plugin-sdk/markdown-table-runtime";
+import { requireRuntimeConfig } from "openclaw/plugin-sdk/plugin-config-runtime";
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import {
+  normalizeLowercaseStringOrEmpty,
+  normalizeOptionalString,
+} from "openclaw/plugin-sdk/string-coerce-runtime";
+import { convertMarkdownTables } from "openclaw/plugin-sdk/text-chunking";
+import { getMattermostRuntime } from "../runtime.js";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  createMattermostDirectChannelWithRetry,
+  createMattermostPost,
+  fetchMattermostChannelByName,
+  fetchMattermostMe,
+  fetchMattermostUserByUsername,
+  fetchMattermostUserTeams,
+  normalizeMattermostBaseUrl,
+  uploadMattermostFile,
+  type MattermostUser,
+  type CreateDmChannelRetryOptions,
+} from "./client.js";
+import {
+  buildButtonProps,
+  resolveInteractionCallbackUrl,
+  setInteractionSecret,
+} from "./interactions.js";
+import { loadOutboundMediaFromUrl, type OpenClawConfig } from "./runtime-api.js";
+import { isMattermostId, resolveMattermostOpaqueTarget } from "./target-resolution.js";
+
+export type MattermostSendOpts = {
+  cfg: OpenClawConfig;
+  botToken?: string;
+  baseUrl?: string;
+  accountId?: string;
+  mediaUrl?: string;
+  mediaLocalRoots?: readonly string[];
+  mediaReadFile?: (filePath: string) => Promise<Buffer>;
+  workspaceDir?: string;
+  /** Fail the send if media cannot be loaded/uploaded instead of posting text-only. */
+  requireMediaUpload?: boolean;
+  replyToId?: string;
+  props?: Record<string, unknown>;
+  buttons?: Array<unknown>;
+  attachmentText?: string;
+  /** Retry options for DM channel creation */
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+  /** Observe the bounded cache-miss DM channel resolution lifecycle. */
+  onDmChannelResolution?: (resolution: PromiseLike<unknown>) => void;
+};
+
+export type MattermostSendResult = {
+  messageId: string;
+  channelId: string;
+  receipt: MessageReceipt;
+};
+
+type MattermostTarget =
+  | { kind: "channel"; id: string }
+  | { kind: "channel-name"; name: string }
+  | { kind: "user"; id?: string; username?: string };
+
+const botUserCache = new Map<string, MattermostUser>();
+const userByNameCache = new Map<string, MattermostUser>();
+const channelByNameCache = new Map<string, string>();
+const dmChannelCache = new Map<string, string>();
+
+const getCore = () => getMattermostRuntime();
+
+function createMattermostSendReceipt(params: {
+  messageId: string;
+  channelId: string;
+  kind: MessageReceiptPartKind;
+  replyToId?: string;
+}): MessageReceipt {
+  const messageIds =
+    params.messageId.trim() && params.messageId !== "unknown" ? [params.messageId] : [];
+  return createMessageReceiptFromOutboundResults({
+    kind: params.kind,
+    ...(params.replyToId ? { replyToId: params.replyToId } : {}),
+    results: messageIds.map((messageId) => ({
+      channel: "mattermost",
+      messageId,
+      channelId: params.channelId,
+    })),
+  });
+}
+
+function resolveMattermostReceiptKind(params: {
+  fileIds?: readonly string[];
+  buttons?: readonly unknown[];
+  props?: Record<string, unknown>;
+}): MessageReceiptPartKind {
+  if (params.fileIds?.length) {
+    return "media";
+  }
+  if (params.buttons?.length || params.props) {
+    return "card";
+  }
+  return "text";
+}
+
+function recordMattermostOutboundActivity(accountId: string): void {
+  try {
+    getCore().channel.activity.record({
+      channel: "mattermost",
+      accountId,
+      direction: "outbound",
+    });
+  } catch (error) {
+    if (!(error instanceof Error) || error.message !== "Mattermost runtime not initialized") {
+      throw error;
+    }
+  }
+}
+
+function cacheKey(baseUrl: string, token: string): string {
+  return `${baseUrl}::${token}`;
+}
+
+function normalizeMessage(text: string, mediaUrl?: string): string {
+  const trimmed = normalizeOptionalString(text) ?? "";
+  const media = normalizeOptionalString(mediaUrl);
+  return [trimmed, media].filter(Boolean).join("\n");
+}
+
+function isHttpUrl(value: string): boolean {
+  return /^https?:\/\//i.test(value);
+}
+export function parseMattermostTarget(raw: string): MattermostTarget {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    throw new Error("Recipient is required for Mattermost sends");
+  }
+  const lower = normalizeLowercaseStringOrEmpty(trimmed);
+  if (lower.startsWith("channel:")) {
+    const id = trimmed.slice("channel:".length).trim();
+    if (!id) {
+      throw new Error("Channel id is required for Mattermost sends");
+    }
+    if (id.startsWith("#")) {
+      const name = id.slice(1).trim();
+      if (!name) {
+        throw new Error("Channel name is required for Mattermost sends");
+      }
+      return { kind: "channel-name", name };
+    }
+    if (!isMattermostId(id)) {
+      return { kind: "channel-name", name: id };
+    }
+    return { kind: "channel", id };
+  }
+  if (lower.startsWith("user:")) {
+    const id = trimmed.slice("user:".length).trim();
+    if (!id) {
+      throw new Error("User id is required for Mattermost sends");
+    }
+    return { kind: "user", id };
+  }
+  if (lower.startsWith("mattermost:")) {
+    const id = trimmed.slice("mattermost:".length).trim();
+    if (!id) {
+      throw new Error("User id is required for Mattermost sends");
+    }
+    return { kind: "user", id };
+  }
+  if (trimmed.startsWith("@")) {
+    const username = trimmed.slice(1).trim();
+    if (!username) {
+      throw new Error("Username is required for Mattermost sends");
+    }
+    return { kind: "user", username };
+  }
+  if (trimmed.startsWith("#")) {
+    const name = trimmed.slice(1).trim();
+    if (!name) {
+      throw new Error("Channel name is required for Mattermost sends");
+    }
+    return { kind: "channel-name", name };
+  }
+  if (!isMattermostId(trimmed)) {
+    return { kind: "channel-name", name: trimmed };
+  }
+  return { kind: "channel", id: trimmed };
+}
+
+async function resolveBotUser(
+  baseUrl: string,
+  token: string,
+  allowPrivateNetwork?: boolean,
+): Promise<MattermostUser> {
+  const key = cacheKey(baseUrl, token);
+  const cached = botUserCache.get(key);
+  if (cached) {
+    return cached;
+  }
+  const client = createMattermostClient({ baseUrl, botToken: token, allowPrivateNetwork });
+  const user = await fetchMattermostMe(client);
+  botUserCache.set(key, user);
+  return user;
+}
+
+async function resolveUserIdByUsername(params: {
+  baseUrl: string;
+  token: string;
+  username: string;
+  allowPrivateNetwork?: boolean;
+}): Promise<string> {
+  const { baseUrl, token, username } = params;
+  const key = `${cacheKey(baseUrl, token)}::${normalizeLowercaseStringOrEmpty(username)}`;
+  const cached = userByNameCache.get(key);
+  if (cached?.id) {
+    return cached.id;
+  }
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+  const user = await fetchMattermostUserByUsername(client, username);
+  userByNameCache.set(key, user);
+  return user.id;
+}
+
+async function resolveChannelIdByName(params: {
+  baseUrl: string;
+  token: string;
+  name: string;
+  allowPrivateNetwork?: boolean;
+}): Promise<string> {
+  const { baseUrl, token, name } = params;
+  const key = `${cacheKey(baseUrl, token)}::channel::${normalizeLowercaseStringOrEmpty(name)}`;
+  const cached = channelByNameCache.get(key);
+  if (cached) {
+    return cached;
+  }
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+  const me = await fetchMattermostMe(client);
+  const teams = await fetchMattermostUserTeams(client, me.id);
+  for (const team of teams) {
+    try {
+      const channel = await fetchMattermostChannelByName(client, team.id, name);
+      if (channel?.id) {
+        channelByNameCache.set(key, channel.id);
+        return channel.id;
+      }
+    } catch {
+      // Channel not found in this team, try next
+    }
+  }
+  throw new Error(`Mattermost channel "#${name}" not found in any team the bot belongs to`);
+}
+
+type ResolveTargetChannelIdParams = {
+  target: MattermostTarget;
+  baseUrl: string;
+  token: string;
+  allowPrivateNetwork?: boolean;
+  dmRetryOptions?: CreateDmChannelRetryOptions;
+  onDmChannelResolution?: (resolution: PromiseLike<unknown>) => void;
+  logger?: { debug?: (msg: string) => void; warn?: (msg: string) => void };
+};
+
+function mergeDmRetryOptions(
+  base?: CreateDmChannelRetryOptions,
+  override?: CreateDmChannelRetryOptions,
+): CreateDmChannelRetryOptions | undefined {
+  const merged: CreateDmChannelRetryOptions = {
+    maxRetries: override?.maxRetries ?? base?.maxRetries,
+    initialDelayMs: override?.initialDelayMs ?? base?.initialDelayMs,
+    maxDelayMs: override?.maxDelayMs ?? base?.maxDelayMs,
+    timeoutMs: override?.timeoutMs ?? base?.timeoutMs,
+    onRetry: override?.onRetry,
+  };
+
+  if (
+    merged.maxRetries === undefined &&
+    merged.initialDelayMs === undefined &&
+    merged.maxDelayMs === undefined &&
+    merged.timeoutMs === undefined &&
+    merged.onRetry === undefined
+  ) {
+    return undefined;
+  }
+
+  return merged;
+}
+
+async function resolveTargetChannelId(params: ResolveTargetChannelIdParams): Promise<string> {
+  if (params.target.kind === "channel") {
+    return params.target.id;
+  }
+  if (params.target.kind === "channel-name") {
+    return await resolveChannelIdByName({
+      baseUrl: params.baseUrl,
+      token: params.token,
+      name: params.target.name,
+      allowPrivateNetwork: params.allowPrivateNetwork,
+    });
+  }
+  const userId = params.target.id
+    ? params.target.id
+    : await resolveUserIdByUsername({
+        baseUrl: params.baseUrl,
+        token: params.token,
+        username: params.target.username ?? "",
+        allowPrivateNetwork: params.allowPrivateNetwork,
+      });
+  const dmKey = `${cacheKey(params.baseUrl, params.token)}::dm::${userId}`;
+  const cachedDm = dmChannelCache.get(dmKey);
+  if (cachedDm) {
+    return cachedDm;
+  }
+  const botUser = await resolveBotUser(params.baseUrl, params.token, params.allowPrivateNetwork);
+  const client = createMattermostClient({
+    baseUrl: params.baseUrl,
+    botToken: params.token,
+    allowPrivateNetwork: params.allowPrivateNetwork,
+  });
+
+  const resolution = createMattermostDirectChannelWithRetry(client, [botUser.id, userId], {
+    ...params.dmRetryOptions,
+    onRetry: (attempt, delayMs, error) => {
+      // Call user's onRetry if provided
+      params.dmRetryOptions?.onRetry?.(attempt, delayMs, error);
+      // Log if verbose mode is enabled
+      if (params.logger) {
+        params.logger.warn?.(
+          `DM channel creation retry ${attempt} after ${delayMs}ms: ${error.message}`,
+        );
+      }
+    },
+  });
+  params.onDmChannelResolution?.(resolution);
+  const channel = await resolution;
+  dmChannelCache.set(dmKey, channel.id);
+  return channel.id;
+}
+
+type MattermostSendContext = {
+  cfg: OpenClawConfig;
+  accountId: string;
+  token: string;
+  baseUrl: string;
+  channelId: string;
+  allowPrivateNetwork?: boolean;
+};
+
+async function resolveMattermostSendContext(
+  to: string,
+  opts: MattermostSendOpts,
+): Promise<MattermostSendContext> {
+  const core = getCore();
+  const logger = core.logging.getChildLogger({ module: "mattermost" });
+  if (!opts?.cfg) {
+    throw new Error(
+      "Mattermost send requires a resolved runtime config. Load and resolve config at the command or gateway boundary, then pass cfg through the runtime path.",
+    );
+  }
+  const cfg = requireRuntimeConfig(opts.cfg, "Mattermost send");
+  const account = resolveMattermostAccount({
+    cfg,
+    accountId: opts.accountId,
+  });
+  const token = normalizeOptionalString(opts.botToken) ?? normalizeOptionalString(account.botToken);
+  if (!token) {
+    throw new Error(
+      `Mattermost bot token missing for account "${account.accountId}" (set channels.mattermost.accounts.${account.accountId}.botToken or MATTERMOST_BOT_TOKEN for default).`,
+    );
+  }
+  const baseUrl = normalizeMattermostBaseUrl(opts.baseUrl ?? account.baseUrl);
+  if (!baseUrl) {
+    throw new Error(
+      `Mattermost baseUrl missing for account "${account.accountId}" (set channels.mattermost.accounts.${account.accountId}.baseUrl or MATTERMOST_URL for default).`,
+    );
+  }
+
+  const trimmedTo = normalizeOptionalString(to) ?? "";
+  const opaqueTarget = await resolveMattermostOpaqueTarget({
+    input: trimmedTo,
+    token,
+    baseUrl,
+  });
+  const target =
+    opaqueTarget?.kind === "user"
+      ? { kind: "user" as const, id: opaqueTarget.id }
+      : opaqueTarget?.kind === "channel"
+        ? { kind: "channel" as const, id: opaqueTarget.id }
+        : parseMattermostTarget(trimmedTo);
+  // Build retry options from account config, allowing opts to override
+  const accountRetryConfig: CreateDmChannelRetryOptions | undefined = account.config.dmChannelRetry
+    ? {
+        maxRetries: account.config.dmChannelRetry.maxRetries,
+        initialDelayMs: account.config.dmChannelRetry.initialDelayMs,
+        maxDelayMs: account.config.dmChannelRetry.maxDelayMs,
+        timeoutMs: account.config.dmChannelRetry.timeoutMs,
+      }
+    : undefined;
+  const dmRetryOptions = mergeDmRetryOptions(accountRetryConfig, opts.dmRetryOptions);
+
+  const allowPrivateNetwork = isPrivateNetworkOptInEnabled(account.config);
+  const channelId = await resolveTargetChannelId({
+    target,
+    baseUrl,
+    token,
+    allowPrivateNetwork,
+    dmRetryOptions,
+    onDmChannelResolution: opts.onDmChannelResolution,
+    logger: core.logging.shouldLogVerbose() ? logger : undefined,
+  });
+
+  return {
+    cfg,
+    accountId: account.accountId,
+    token,
+    baseUrl,
+    channelId,
+    allowPrivateNetwork,
+  };
+}
+
+export async function sendMessageMattermost(
+  to: string,
+  text: string,
+  opts: MattermostSendOpts,
+): Promise<MattermostSendResult> {
+  const core = getCore();
+  const logger = core.logging.getChildLogger({ module: "mattermost" });
+  const { cfg, accountId, token, baseUrl, channelId, allowPrivateNetwork } =
+    await resolveMattermostSendContext(to, opts);
+
+  const client = createMattermostClient({ baseUrl, botToken: token, allowPrivateNetwork });
+  let props = opts.props;
+  if (!props && Array.isArray(opts.buttons) && opts.buttons.length > 0) {
+    setInteractionSecret(accountId, token);
+    props = buildButtonProps({
+      callbackUrl: resolveInteractionCallbackUrl(accountId, {
+        gateway: cfg.gateway,
+        interactions: resolveMattermostAccount({
+          cfg,
+          accountId,
+        }).config?.interactions,
+      }),
+      accountId,
+      channelId,
+      buttons: opts.buttons,
+      text: opts.attachmentText,
+    });
+  }
+  let message = normalizeOptionalString(text) ?? "";
+  let fileIds: string[] | undefined;
+  let uploadError: Error | undefined;
+  const mediaUrl = opts.mediaUrl?.trim();
+  if (mediaUrl) {
+    try {
+      const media = await loadOutboundMediaFromUrl(mediaUrl, {
+        mediaLocalRoots: opts.mediaLocalRoots,
+        mediaReadFile: opts.mediaReadFile,
+        workspaceDir: opts.workspaceDir,
+      });
+      const fileInfo = await uploadMattermostFile(client, {
+        channelId,
+        buffer: media.buffer,
+        fileName: media.fileName ?? "upload",
+        contentType: media.contentType ?? undefined,
+      });
+      fileIds = [fileInfo.id];
+    } catch (err) {
+      uploadError = err instanceof Error ? err : new Error(String(err));
+      if (opts.requireMediaUpload) {
+        throw new Error(`Mattermost media upload failed: ${uploadError.message}`, {
+          cause: err,
+        });
+      }
+      if (core.logging.shouldLogVerbose()) {
+        logger.debug?.(
+          `mattermost send: media upload failed, falling back to URL text: ${String(err)}`,
+        );
+      }
+      message = normalizeMessage(message, isHttpUrl(mediaUrl) ? mediaUrl : "");
+    }
+  }
+
+  if (message) {
+    const tableMode = resolveMarkdownTableMode({
+      cfg,
+      channel: "mattermost",
+      accountId,
+    });
+    message = convertMarkdownTables(message, tableMode);
+  }
+
+  if (!message && (!fileIds || fileIds.length === 0)) {
+    if (uploadError) {
+      throw new Error(`Mattermost media upload failed: ${uploadError.message}`, {
+        cause: uploadError,
+      });
+    }
+    throw new Error("Mattermost message is empty");
+  }
+
+  const post = await createMattermostPost(client, {
+    channelId,
+    message,
+    rootId: opts.replyToId,
+    fileIds,
+    props,
+  });
+
+  recordMattermostOutboundActivity(accountId);
+  const messageId = post.id ?? "unknown";
+
+  return {
+    messageId,
+    channelId,
+    receipt: createMattermostSendReceipt({
+      messageId,
+      channelId,
+      kind: resolveMattermostReceiptKind({
+        fileIds,
+        buttons: opts.buttons,
+        props,
+      }),
+      replyToId: opts.replyToId,
+    }),
+  };
+}

extensions/mattermost/src/mattermost/slash-commands.test.ts

@@ -0,0 +1,247 @@
+// Mattermost tests cover slash commands plugin behavior.
+import { describe, expect, it, vi } from "vitest";
+import type { MattermostClient } from "./client.js";
+import {
+  DEFAULT_COMMAND_SPECS,
+  MATTERMOST_SLASH_POST_METHOD,
+  parseSlashCommandPayload,
+  registerSlashCommands,
+  resolveCallbackUrl,
+  resolveCommandText,
+  resolveSlashCommandConfig,
+} from "./slash-commands.js";
+
+describe("slash-commands", () => {
+  async function registerSingleStatusCommand(
+    requestImpl: (path: string, init?: RequestInit) => Promise<unknown>,
+  ) {
+    const client: MattermostClient = {
+      baseUrl: "https://chat.example.com",
+      apiBaseUrl: "https://chat.example.com/api/v4",
+      token: "bot-token",
+      request: async <T>(path: string, init?: RequestInit) => (await requestImpl(path, init)) as T,
+      fetchImpl: vi.fn<typeof fetch>(),
+    };
+    return registerSlashCommands({
+      client,
+      teamId: "team-1",
+      creatorUserId: "bot-user",
+      callbackUrl: "http://gateway/callback",
+      commands: [
+        {
+          trigger: "oc_status",
+          description: "status",
+          autoComplete: true,
+        },
+      ],
+    });
+  }
+
+  it("parses application/x-www-form-urlencoded payloads", () => {
+    const payload = parseSlashCommandPayload(
+      "token=t1&team_id=team&channel_id=ch1&user_id=u1&command=%2Foc_status&text=now",
+      "application/x-www-form-urlencoded",
+    );
+    expect(payload).toEqual({
+      token: "t1",
+      team_id: "team",
+      team_domain: undefined,
+      channel_id: "ch1",
+      channel_name: undefined,
+      user_id: "u1",
+      user_name: undefined,
+      command: "/oc_status",
+      text: "now",
+      trigger_id: undefined,
+      response_url: undefined,
+    });
+  });
+
+  it("parses application/json payloads", () => {
+    const payload = parseSlashCommandPayload(
+      JSON.stringify({
+        token: "t2",
+        team_id: "team",
+        channel_id: "ch2",
+        user_id: "u2",
+        command: "/oc_model",
+        text: "gpt-5",
+      }),
+      "application/json; charset=utf-8",
+    );
+    expect(payload).toEqual({
+      token: "t2",
+      team_id: "team",
+      team_domain: undefined,
+      channel_id: "ch2",
+      channel_name: undefined,
+      user_id: "u2",
+      user_name: undefined,
+      command: "/oc_model",
+      text: "gpt-5",
+      trigger_id: undefined,
+      response_url: undefined,
+    });
+  });
+
+  it("returns null for malformed payloads missing required fields", () => {
+    const payload = parseSlashCommandPayload(
+      JSON.stringify({ token: "t3", command: "/oc_help" }),
+      "application/json",
+    );
+    expect(payload).toBeNull();
+  });
+
+  it("resolves command text with trigger map fallback", () => {
+    const triggerMap = new Map<string, string>([["oc_status", "status"]]);
+    expect(resolveCommandText("oc_status", "   ", triggerMap)).toBe("/status");
+    expect(resolveCommandText("oc_status", " now ", triggerMap)).toBe("/status now");
+    expect(resolveCommandText("oc_models", " openai ", undefined)).toBe("/models openai");
+    expect(resolveCommandText("oc_help", "", undefined)).toBe("/help");
+  });
+
+  it("registers both public model slash commands", () => {
+    expect(
+      DEFAULT_COMMAND_SPECS.filter(
+        (spec) => spec.trigger === "oc_model" || spec.trigger === "oc_models",
+      ).map((spec) => spec.trigger),
+    ).toEqual(["oc_model", "oc_models"]);
+  });
+
+  it("registers the queue command mapped to the core /queue directive", () => {
+    const queueSpec = DEFAULT_COMMAND_SPECS.find((spec) => spec.trigger === "oc_queue");
+    expect(queueSpec?.originalName).toBe("queue");
+    const triggerMap = new Map<string, string>([["oc_queue", "queue"]]);
+    expect(resolveCommandText("oc_queue", " collect drop:summarize ", triggerMap)).toBe(
+      "/queue collect drop:summarize",
+    );
+  });
+
+  it("normalizes callback path in slash config", () => {
+    const config = resolveSlashCommandConfig({ callbackPath: "api/channels/mattermost/command" });
+    expect(config.callbackPath).toBe("/api/channels/mattermost/command");
+  });
+
+  it("falls back to localhost callback URL for wildcard bind hosts", () => {
+    const config = resolveSlashCommandConfig({ callbackPath: "/api/channels/mattermost/command" });
+    const callbackUrl = resolveCallbackUrl({
+      config,
+      gatewayPort: 18789,
+      gatewayHost: "0.0.0.0",
+    });
+    expect(callbackUrl).toBe("http://localhost:18789/api/channels/mattermost/command");
+  });
+
+  it("reuses existing command when trigger already points to callback URL", async () => {
+    const request = vi.fn(async (path: string) => {
+      if (path.startsWith("/commands?team_id=")) {
+        return [
+          {
+            id: "cmd-1",
+            token: "tok-1",
+            team_id: "team-1",
+            creator_id: "bot-user",
+            trigger: "oc_status",
+            method: "P",
+            url: "http://gateway/callback",
+            auto_complete: true,
+          },
+        ];
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    });
+    const result = await registerSingleStatusCommand(request);
+
+    expect(result).toHaveLength(1);
+    const firstCommand = result[0];
+    if (!firstCommand) {
+      throw new Error("expected Mattermost slash command result");
+    }
+    expect(firstCommand.managed).toBe(false);
+    expect(firstCommand.id).toBe("cmd-1");
+    expect(request).toHaveBeenCalledTimes(1);
+  });
+
+  it("skips foreign command trigger collisions instead of mutating non-owned commands", async () => {
+    const request = vi.fn(async (path: string, init?: { method?: string }) => {
+      if (path.startsWith("/commands?team_id=")) {
+        return [
+          {
+            id: "cmd-foreign-1",
+            token: "tok-foreign-1",
+            team_id: "team-1",
+            creator_id: "another-bot-user",
+            trigger: "oc_status",
+            method: "P",
+            url: "http://foreign/callback",
+            auto_complete: true,
+          },
+        ];
+      }
+      if (init?.method === "POST" || init?.method === "PUT" || init?.method === "DELETE") {
+        throw new Error("should not mutate foreign commands");
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    });
+    const result = await registerSingleStatusCommand(request);
+
+    expect(result).toHaveLength(0);
+    expect(request).toHaveBeenCalledTimes(1);
+  });
+
+  it("updates owned commands when callback method drifts from POST", async () => {
+    const request = vi.fn(async (path: string, init?: RequestInit) => {
+      if (path.startsWith("/commands?team_id=")) {
+        return [
+          {
+            id: "cmd-1",
+            token: "tok-old",
+            team_id: "team-1",
+            creator_id: "bot-user",
+            trigger: "oc_status",
+            method: "G",
+            url: "http://gateway/callback",
+            auto_complete: true,
+          },
+        ];
+      }
+      if (path === "/commands/cmd-1" && init?.method === "PUT") {
+        expect(JSON.parse(typeof init.body === "string" ? init.body : "{}")).toEqual({
+          id: "cmd-1",
+          team_id: "team-1",
+          trigger: "oc_status",
+          method: MATTERMOST_SLASH_POST_METHOD,
+          url: "http://gateway/callback",
+          description: "status",
+          auto_complete: true,
+          auto_complete_desc: "status",
+          auto_complete_hint: undefined,
+        });
+        return {
+          id: "cmd-1",
+          token: "tok-updated",
+          team_id: "team-1",
+          creator_id: "bot-user",
+          trigger: "oc_status",
+          method: MATTERMOST_SLASH_POST_METHOD,
+          url: "http://gateway/callback",
+          auto_complete: true,
+        };
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    });
+    const result = await registerSingleStatusCommand(request);
+
+    expect(result).toEqual([
+      {
+        id: "cmd-1",
+        trigger: "oc_status",
+        teamId: "team-1",
+        token: "tok-updated",
+        url: "http://gateway/callback",
+        managed: false,
+      },
+    ]);
+    expect(request).toHaveBeenCalledTimes(2);
+  });
+});

extensions/mattermost/src/mattermost/slash-commands.ts

@@ -0,0 +1,598 @@
+// Mattermost plugin module implements slash commands behavior.
+import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
+import type { MattermostClient } from "./client.js";
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+export const MATTERMOST_SLASH_POST_METHOD = "P";
+
+export type MattermostSlashCommandConfig = {
+  /** Enable native slash commands. "auto" resolves to false for now (opt-in). */
+  native: boolean | "auto";
+  /** Also register skill-based commands. */
+  nativeSkills: boolean | "auto";
+  /** Path for the callback endpoint on the gateway HTTP server. */
+  callbackPath: string;
+  /**
+   * Explicit callback URL override (e.g. behind a reverse proxy).
+   * If not set, auto-derived from baseUrl + gateway port + callbackPath.
+   */
+  callbackUrl?: string;
+};
+
+export type MattermostCommandSpec = {
+  trigger: string;
+  description: string;
+  autoComplete: boolean;
+  autoCompleteHint?: string;
+  /** Original command name (for skill commands that start with oc_) */
+  originalName?: string;
+};
+
+export type MattermostRegisteredCommand = {
+  id: string;
+  trigger: string;
+  teamId: string;
+  token: string;
+  url: string;
+  /** True when this process created the command and should delete it on shutdown. */
+  managed: boolean;
+};
+
+/**
+ * Payload sent by Mattermost when a slash command is invoked.
+ * Can arrive as application/x-www-form-urlencoded or application/json.
+ */
+export type MattermostSlashCommandPayload = {
+  token: string;
+  team_id: string;
+  team_domain?: string;
+  channel_id: string;
+  channel_name?: string;
+  user_id: string;
+  user_name?: string;
+  command: string; // e.g. "/status"
+  text: string; // args after the trigger word
+  trigger_id?: string;
+  response_url?: string;
+};
+
+/**
+ * Response format for Mattermost slash command callbacks.
+ */
+export type MattermostSlashCommandResponse = {
+  response_type?: "ephemeral" | "in_channel";
+  text: string;
+  username?: string;
+  icon_url?: string;
+  goto_location?: string;
+  attachments?: unknown[];
+};
+
+// ─── MM API types ────────────────────────────────────────────────────────────
+
+type MattermostCommandCreate = {
+  team_id: string;
+  trigger: string;
+  method: typeof MATTERMOST_SLASH_POST_METHOD | "G";
+  url: string;
+  description?: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+  token?: string;
+  creator_id?: string;
+};
+
+type MattermostCommandUpdate = {
+  id: string;
+  team_id: string;
+  trigger: string;
+  method: typeof MATTERMOST_SLASH_POST_METHOD | "G";
+  url: string;
+  description?: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+};
+
+export type MattermostCommandResponse = {
+  id: string;
+  token: string;
+  team_id: string;
+  trigger: string;
+  method: string;
+  url: string;
+  auto_complete: boolean;
+  auto_complete_desc?: string;
+  auto_complete_hint?: string;
+  creator_id?: string;
+  create_at?: number;
+  update_at?: number;
+  delete_at?: number;
+};
+
+// ─── Default commands ────────────────────────────────────────────────────────
+
+/**
+ * Built-in OpenClaw commands to register as native slash commands.
+ * These mirror the text-based commands already handled by the gateway.
+ */
+export const DEFAULT_COMMAND_SPECS: MattermostCommandSpec[] = [
+  {
+    trigger: "oc_status",
+    originalName: "status",
+    description: "Show session status (model, usage, uptime)",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_model",
+    originalName: "model",
+    description: "View or change the current model",
+    autoComplete: true,
+    autoCompleteHint: "[model-name] [--runtime runtime]",
+  },
+  {
+    trigger: "oc_models",
+    originalName: "models",
+    description: "Browse available models",
+    autoComplete: true,
+    autoCompleteHint: "[provider]",
+  },
+  {
+    trigger: "oc_new",
+    originalName: "new",
+    description: "Start a new conversation session",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_help",
+    originalName: "help",
+    description: "Show available commands",
+    autoComplete: true,
+  },
+  {
+    trigger: "oc_think",
+    originalName: "think",
+    description: "Set thinking/reasoning level",
+    autoComplete: true,
+    autoCompleteHint: "[off|low|medium|high]",
+  },
+  {
+    trigger: "oc_reasoning",
+    originalName: "reasoning",
+    description: "Toggle reasoning mode",
+    autoComplete: true,
+    autoCompleteHint: "[on|off]",
+  },
+  {
+    trigger: "oc_verbose",
+    originalName: "verbose",
+    description: "Toggle verbose mode",
+    autoComplete: true,
+    autoCompleteHint: "[on|off]",
+  },
+  {
+    trigger: "oc_queue",
+    originalName: "queue",
+    description: "Adjust active-run queue behavior",
+    autoComplete: true,
+    autoCompleteHint: "[steer|followup|collect|interrupt] [debounce:2s] [cap:N] [drop:old|new|summarize]",
+  },
+];
+
+// ─── Command registration ────────────────────────────────────────────────────
+
+/**
+ * List existing custom slash commands for a team.
+ */
+export async function listMattermostCommands(
+  client: MattermostClient,
+  teamId: string,
+  init?: Pick<RequestInit, "signal">,
+): Promise<MattermostCommandResponse[]> {
+  return await client.request<MattermostCommandResponse[]>(
+    `/commands?team_id=${encodeURIComponent(teamId)}&custom_only=true`,
+    init,
+  );
+}
+
+/**
+ * Get a custom slash command by id.
+ */
+export async function getMattermostCommand(
+  client: MattermostClient,
+  commandId: string,
+  init?: Pick<RequestInit, "signal">,
+): Promise<MattermostCommandResponse> {
+  return await client.request<MattermostCommandResponse>(
+    `/commands/${encodeURIComponent(commandId)}`,
+    init,
+  );
+}
+
+/**
+ * Create a custom slash command on a Mattermost team.
+ */
+async function createMattermostCommand(
+  client: MattermostClient,
+  params: MattermostCommandCreate,
+): Promise<MattermostCommandResponse> {
+  return await client.request<MattermostCommandResponse>("/commands", {
+    method: "POST",
+    body: JSON.stringify(params),
+  });
+}
+
+/**
+ * Delete a custom slash command.
+ */
+async function deleteMattermostCommand(client: MattermostClient, commandId: string): Promise<void> {
+  await client.request<Record<string, unknown>>(`/commands/${encodeURIComponent(commandId)}`, {
+    method: "DELETE",
+  });
+}
+
+/**
+ * Update an existing custom slash command.
+ */
+async function updateMattermostCommand(
+  client: MattermostClient,
+  params: MattermostCommandUpdate,
+): Promise<MattermostCommandResponse> {
+  return await client.request<MattermostCommandResponse>(
+    `/commands/${encodeURIComponent(params.id)}`,
+    {
+      method: "PUT",
+      body: JSON.stringify(params),
+    },
+  );
+}
+
+/**
+ * Register all OpenClaw slash commands for a given team.
+ * Skips commands that are already registered with the same trigger + callback URL.
+ * Returns the list of newly created command IDs.
+ */
+export async function registerSlashCommands(params: {
+  client: MattermostClient;
+  teamId: string;
+  creatorUserId: string;
+  callbackUrl: string;
+  commands: MattermostCommandSpec[];
+  log?: (msg: string) => void;
+}): Promise<MattermostRegisteredCommand[]> {
+  const { client, teamId, creatorUserId, callbackUrl, commands, log } = params;
+  const normalizedCreatorUserId = creatorUserId.trim();
+  if (!normalizedCreatorUserId) {
+    throw new Error("creatorUserId is required for slash command reconciliation");
+  }
+
+  // Fetch existing commands to avoid duplicates
+  let existing: MattermostCommandResponse[];
+  try {
+    existing = await listMattermostCommands(client, teamId);
+  } catch (err) {
+    log?.(`mattermost: failed to list existing commands: ${String(err)}`);
+    // Fail closed: if we can't list existing commands, we should not attempt to
+    // create/update anything because we may create duplicates and end up with an
+    // empty/partial token set (causing callbacks to be rejected until restart).
+    throw err;
+  }
+
+  const existingByTrigger = new Map<string, MattermostCommandResponse[]>();
+  for (const cmd of existing) {
+    const list = existingByTrigger.get(cmd.trigger) ?? [];
+    list.push(cmd);
+    existingByTrigger.set(cmd.trigger, list);
+  }
+
+  const registered: MattermostRegisteredCommand[] = [];
+
+  for (const spec of commands) {
+    const existingForTrigger = existingByTrigger.get(spec.trigger) ?? [];
+    const ownedCommands = existingForTrigger.filter(
+      (cmd) => cmd.creator_id?.trim() === normalizedCreatorUserId,
+    );
+    const foreignCommands = existingForTrigger.filter(
+      (cmd) => cmd.creator_id?.trim() !== normalizedCreatorUserId,
+    );
+
+    if (ownedCommands.length === 0 && foreignCommands.length > 0) {
+      log?.(
+        `mattermost: trigger /${spec.trigger} already used by non-OpenClaw command(s); skipping to avoid mutating external integrations`,
+      );
+      continue;
+    }
+
+    if (ownedCommands.length > 1) {
+      log?.(
+        `mattermost: multiple owned commands found for /${spec.trigger}; using the first and leaving extras untouched`,
+      );
+    }
+
+    const existingCmd = ownedCommands[0];
+
+    const existingNeedsUpdate = existingCmd
+      ? existingCmd.url !== callbackUrl || existingCmd.method !== MATTERMOST_SLASH_POST_METHOD
+      : false;
+
+    // Already registered with the correct callback URL and method.
+    if (existingCmd && !existingNeedsUpdate) {
+      log?.(`mattermost: command /${spec.trigger} already registered (id=${existingCmd.id})`);
+      registered.push({
+        id: existingCmd.id,
+        trigger: spec.trigger,
+        teamId,
+        token: existingCmd.token,
+        url: callbackUrl,
+        managed: false,
+      });
+      continue;
+    }
+
+    // Exists but has drifted critical callback fields: attempt to reconcile by
+    // updating (useful during callback URL migrations or method drift).
+    if (existingCmd && existingNeedsUpdate) {
+      log?.(
+        `mattermost: command /${spec.trigger} exists with different callback settings; updating (id=${existingCmd.id})`,
+      );
+      try {
+        const updated = await updateMattermostCommand(client, {
+          id: existingCmd.id,
+          team_id: teamId,
+          trigger: spec.trigger,
+          method: MATTERMOST_SLASH_POST_METHOD,
+          url: callbackUrl,
+          description: spec.description,
+          auto_complete: spec.autoComplete,
+          auto_complete_desc: spec.description,
+          auto_complete_hint: spec.autoCompleteHint,
+        });
+        registered.push({
+          id: updated.id,
+          trigger: spec.trigger,
+          teamId,
+          token: updated.token,
+          url: callbackUrl,
+          managed: false,
+        });
+        continue;
+      } catch (err) {
+        log?.(
+          `mattermost: failed to update command /${spec.trigger} (id=${existingCmd.id}): ${String(err)}`,
+        );
+        // Fallback: try delete+recreate for commands owned by this bot user.
+        try {
+          await deleteMattermostCommand(client, existingCmd.id);
+          log?.(`mattermost: deleted stale command /${spec.trigger} (id=${existingCmd.id})`);
+        } catch (deleteErr) {
+          log?.(
+            `mattermost: failed to delete stale command /${spec.trigger} (id=${existingCmd.id}): ${String(deleteErr)}`,
+          );
+          // Can't reconcile; skip this command.
+          continue;
+        }
+        // Continue on to create below.
+      }
+    }
+
+    try {
+      const created = await createMattermostCommand(client, {
+        team_id: teamId,
+        trigger: spec.trigger,
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: callbackUrl,
+        description: spec.description,
+        auto_complete: spec.autoComplete,
+        auto_complete_desc: spec.description,
+        auto_complete_hint: spec.autoCompleteHint,
+      });
+      log?.(`mattermost: registered command /${spec.trigger} (id=${created.id})`);
+      registered.push({
+        id: created.id,
+        trigger: spec.trigger,
+        teamId,
+        token: created.token,
+        url: callbackUrl,
+        managed: true,
+      });
+    } catch (err) {
+      log?.(`mattermost: failed to register command /${spec.trigger}: ${String(err)}`);
+    }
+  }
+
+  return registered;
+}
+
+/**
+ * Clean up all registered slash commands.
+ */
+export async function cleanupSlashCommands(params: {
+  client: MattermostClient;
+  commands: MattermostRegisteredCommand[];
+  log?: (msg: string) => void;
+}): Promise<void> {
+  const { client, commands, log } = params;
+  for (const cmd of commands) {
+    if (!cmd.managed) {
+      continue;
+    }
+    try {
+      await deleteMattermostCommand(client, cmd.id);
+      log?.(`mattermost: deleted command /${cmd.trigger} (id=${cmd.id})`);
+    } catch (err) {
+      log?.(`mattermost: failed to delete command /${cmd.trigger}: ${String(err)}`);
+    }
+  }
+}
+
+// ─── Callback parsing ────────────────────────────────────────────────────────
+
+/**
+ * Parse a Mattermost slash command callback payload from a URL-encoded or JSON body.
+ */
+export function parseSlashCommandPayload(
+  body: string,
+  contentType?: string,
+): MattermostSlashCommandPayload | null {
+  if (!body) {
+    return null;
+  }
+
+  try {
+    if (contentType?.includes("application/json")) {
+      const parsed = JSON.parse(body) as Record<string, unknown>;
+
+      // Validate required fields (same checks as the form-encoded branch)
+      const token = typeof parsed.token === "string" ? parsed.token : "";
+      const teamId = typeof parsed.team_id === "string" ? parsed.team_id : "";
+      const channelId = typeof parsed.channel_id === "string" ? parsed.channel_id : "";
+      const userId = typeof parsed.user_id === "string" ? parsed.user_id : "";
+      const command = typeof parsed.command === "string" ? parsed.command : "";
+
+      if (!token || !teamId || !channelId || !userId || !command) {
+        return null;
+      }
+
+      return {
+        token,
+        team_id: teamId,
+        team_domain: typeof parsed.team_domain === "string" ? parsed.team_domain : undefined,
+        channel_id: channelId,
+        channel_name: typeof parsed.channel_name === "string" ? parsed.channel_name : undefined,
+        user_id: userId,
+        user_name: typeof parsed.user_name === "string" ? parsed.user_name : undefined,
+        command,
+        text: typeof parsed.text === "string" ? parsed.text : "",
+        trigger_id: typeof parsed.trigger_id === "string" ? parsed.trigger_id : undefined,
+        response_url: typeof parsed.response_url === "string" ? parsed.response_url : undefined,
+      };
+    }
+
+    // Default: application/x-www-form-urlencoded
+    const params = new URLSearchParams(body);
+    const token = params.get("token");
+    const teamId = params.get("team_id");
+    const channelId = params.get("channel_id");
+    const userId = params.get("user_id");
+    const command = params.get("command");
+
+    if (!token || !teamId || !channelId || !userId || !command) {
+      return null;
+    }
+
+    return {
+      token,
+      team_id: teamId,
+      team_domain: params.get("team_domain") ?? undefined,
+      channel_id: channelId,
+      channel_name: params.get("channel_name") ?? undefined,
+      user_id: userId,
+      user_name: params.get("user_name") ?? undefined,
+      command,
+      text: params.get("text") ?? "",
+      trigger_id: params.get("trigger_id") ?? undefined,
+      response_url: params.get("response_url") ?? undefined,
+    };
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Map the trigger word back to the original OpenClaw command name.
+ * e.g. "oc_status" -> "/status", "oc_model" -> "/model"
+ */
+export function resolveCommandText(
+  trigger: string,
+  text: string,
+  triggerMap?: ReadonlyMap<string, string>,
+): string {
+  // Use the trigger map if available for accurate name resolution
+  const commandName =
+    triggerMap?.get(trigger) ?? (trigger.startsWith("oc_") ? trigger.slice(3) : trigger);
+  const args = text.trim();
+  return args ? `/${commandName} ${args}` : `/${commandName}`;
+}
+
+export function normalizeSlashCommandTrigger(command: string): string {
+  return command.replace(/^\//, "").trim();
+}
+
+// ─── Config resolution ───────────────────────────────────────────────────────
+
+const DEFAULT_CALLBACK_PATH = "/api/channels/mattermost/command";
+
+/**
+ * Ensure the callback path starts with a leading `/` to prevent
+ * malformed URLs like `http://host:portapi/...`.
+ */
+function normalizeCallbackPath(path: string): string {
+  const trimmed = path.trim();
+  if (!trimmed) {
+    return DEFAULT_CALLBACK_PATH;
+  }
+  return trimmed.startsWith("/") ? trimmed : `/${trimmed}`;
+}
+
+export function resolveSlashCommandConfig(
+  raw?: Partial<MattermostSlashCommandConfig>,
+): MattermostSlashCommandConfig {
+  return {
+    native: raw?.native ?? "auto",
+    nativeSkills: raw?.nativeSkills ?? "auto",
+    callbackPath: normalizeCallbackPath(raw?.callbackPath ?? DEFAULT_CALLBACK_PATH),
+    callbackUrl: normalizeOptionalString(raw?.callbackUrl),
+  };
+}
+
+export function isSlashCommandsEnabled(config: MattermostSlashCommandConfig): boolean {
+  if (config.native === true) {
+    return true;
+  }
+  if (config.native === false) {
+    return false;
+  }
+  // "auto" defaults to false for mattermost (opt-in)
+  return false;
+}
+
+/**
+ * Build the callback URL that Mattermost will POST to when a command is invoked.
+ */
+export function resolveCallbackUrl(params: {
+  config: MattermostSlashCommandConfig;
+  gatewayPort: number;
+  gatewayHost?: string;
+}): string {
+  if (params.config.callbackUrl) {
+    return params.config.callbackUrl;
+  }
+
+  const isWildcardBindHost = (rawHost: string): boolean => {
+    const trimmed = rawHost.trim();
+    if (!trimmed) {
+      return false;
+    }
+    const host = trimmed.startsWith("[") && trimmed.endsWith("]") ? trimmed.slice(1, -1) : trimmed;
+
+    // NOTE: Wildcard listen hosts are valid bind addresses but are not routable callback
+    // destinations. Don't emit callback URLs like http://0.0.0.0:3015/... or http://[::]:3015/...
+    // when an operator sets gateway.customBindHost.
+    return host === "0.0.0.0" || host === "::" || host === "0:0:0:0:0:0:0:0" || host === "::0";
+  };
+
+  let host =
+    params.gatewayHost && !isWildcardBindHost(params.gatewayHost)
+      ? params.gatewayHost
+      : "localhost";
+  const path = normalizeCallbackPath(params.config.callbackPath);
+
+  // Bracket IPv6 literals so the URL is valid: http://[::1]:3015/...
+  if (host.includes(":") && !(host.startsWith("[") && host.endsWith("]"))) {
+    host = `[${host}]`;
+  }
+
+  return `http://${host}:${params.gatewayPort}${path}`;
+}

extensions/mattermost/src/mattermost/slash-http.send-config.test.ts

@@ -0,0 +1,395 @@
+// Mattermost tests cover slash http.send config plugin behavior.
+import { ServerResponse, type IncomingMessage } from "node:http";
+import { PassThrough } from "node:stream";
+import type { OpenClawConfig } from "openclaw/plugin-sdk/core";
+import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+
+const mockState = vi.hoisted(() => ({
+  readRequestBodyWithLimit: vi.fn(async () => "token=valid-token"),
+  parseSlashCommandPayload: vi.fn(() => ({
+    token: "valid-token",
+    command: "/oc_models",
+    text: "models",
+    channel_id: "chan-1",
+    user_id: "user-1",
+    user_name: "alice",
+    team_id: "team-1",
+  })),
+  resolveCommandText: vi.fn((_trigger: string, text: string) => text),
+  buildModelsProviderData: vi.fn(async () => ({ providers: [], modelNames: new Map() })),
+  resolveMattermostModelPickerEntry: vi.fn(() => ({ kind: "summary" })),
+  authorizeMattermostCommandInvocation: vi.fn(() => ({
+    ok: true,
+    commandAuthorized: true,
+    channelInfo: { id: "chan-1", type: "O", name: "town-square", display_name: "Town Square" },
+    kind: "channel",
+    chatType: "channel",
+    channelName: "town-square",
+    channelDisplay: "Town Square",
+    roomLabel: "#town-square",
+  })),
+  createMattermostClient: vi.fn(() => ({})),
+  fetchMattermostChannel: vi.fn(async () => ({
+    id: "chan-1",
+    type: "O",
+    name: "town-square",
+    display_name: "Town Square",
+  })),
+  sendMessageMattermost: vi.fn(async () => ({ messageId: "post-1", channelId: "chan-1" })),
+  normalizeMattermostAllowList: vi.fn((value: unknown) => value),
+  getMattermostCommand: vi.fn(async () => ({
+    id: "cmd-1",
+    token: "valid-token",
+    team_id: "team-1",
+    trigger: "oc_models",
+    method: "P",
+    url: "https://gateway.example.com/slash",
+    delete_at: 0,
+  })),
+  listMattermostCommands: vi.fn(async () => []),
+}));
+
+vi.mock("./runtime-api.js", () => {
+  return {
+    buildModelsProviderData: mockState.buildModelsProviderData,
+    createChannelMessageReplyPipeline: vi.fn(() => ({
+      onModelSelected: vi.fn(),
+      typingCallbacks: {},
+    })),
+    createDedupeCache: vi.fn(() => ({
+      check: () => false,
+    })),
+    createReplyPrefixOptions: vi.fn(() => ({})),
+    createTypingCallbacks: vi.fn(() => ({ onReplyStart: vi.fn() })),
+    isRequestBodyLimitError: vi.fn(() => false),
+    logTypingFailure: vi.fn(),
+    formatInboundFromLabel: vi.fn(() => ""),
+    rawDataToString: vi.fn((value: unknown) => (typeof value === "string" ? value : "")),
+    readRequestBodyWithLimit: mockState.readRequestBodyWithLimit,
+    resolveThreadSessionKeys: vi.fn((params: { baseSessionKey: string }) => ({
+      sessionKey: params.baseSessionKey,
+      parentSessionKey: undefined,
+    })),
+  };
+});
+
+vi.mock("../runtime.js", () => ({
+  getMattermostRuntime: () => ({
+    channel: {
+      commands: {
+        shouldHandleTextCommands: () => true,
+      },
+      text: {
+        hasControlCommand: () => false,
+      },
+      pairing: {
+        readAllowFromStore: vi.fn(async () => []),
+      },
+      routing: {
+        resolveAgentRoute: vi.fn(() => ({
+          agentId: "agent-1",
+          sessionKey: "mattermost:session:1",
+          accountId: "default",
+        })),
+      },
+    },
+  }),
+}));
+
+vi.mock("./client.js", async () => {
+  const actual = await vi.importActual<typeof import("./client.js")>("./client.js");
+  return {
+    ...actual,
+    createMattermostClient: mockState.createMattermostClient,
+    fetchMattermostChannel: mockState.fetchMattermostChannel,
+    normalizeMattermostBaseUrl: vi.fn((value: string | undefined) => value?.trim() ?? ""),
+    sendMattermostTyping: vi.fn(),
+  };
+});
+
+vi.mock("./model-picker.js", () => ({
+  renderMattermostModelSummaryView: vi.fn(),
+  renderMattermostModelsPickerView: vi.fn(),
+  renderMattermostProviderPickerView: vi.fn(),
+  resolveMattermostModelPickerCurrentModel: vi.fn(),
+  resolveMattermostModelPickerEntry: mockState.resolveMattermostModelPickerEntry,
+}));
+
+vi.mock("./monitor-auth.js", () => ({
+  authorizeMattermostCommandInvocation: mockState.authorizeMattermostCommandInvocation,
+  normalizeMattermostAllowList: mockState.normalizeMattermostAllowList,
+}));
+
+vi.mock("./reply-delivery.js", () => ({
+  deliverMattermostReplyPayload: vi.fn(),
+}));
+
+vi.mock("./send.js", () => ({
+  sendMessageMattermost: mockState.sendMessageMattermost,
+}));
+
+vi.mock("./slash-commands.js", () => ({
+  MATTERMOST_SLASH_POST_METHOD: "P",
+  getMattermostCommand: mockState.getMattermostCommand,
+  listMattermostCommands: mockState.listMattermostCommands,
+  normalizeSlashCommandTrigger: (command: string) => command.replace(/^\//, "").trim(),
+  parseSlashCommandPayload: mockState.parseSlashCommandPayload,
+  resolveCommandText: mockState.resolveCommandText,
+}));
+
+let createSlashCommandHttpHandler: typeof import("./slash-http.js").createSlashCommandHttpHandler;
+const callbackUrlFixture = "https://gateway.example.com/slash";
+
+function createRequest(body = "token=valid-token"): IncomingMessage {
+  const req = new PassThrough();
+  const incoming = req as PassThrough & IncomingMessage;
+  incoming.method = "POST";
+  incoming.url = "/slash";
+  incoming.headers = {
+    "content-type": "application/x-www-form-urlencoded",
+  };
+  process.nextTick(() => {
+    req.end(body);
+  });
+  return incoming;
+}
+
+function createResponse(): {
+  res: ServerResponse;
+  getBody: () => string;
+} {
+  let body = "";
+  class TestServerResponse extends ServerResponse {
+    override setHeader() {
+      return this;
+    }
+
+    override end(): this;
+    override end(cb: () => void): this;
+    override end(chunk: string | Buffer | Uint8Array, cb?: () => void): this;
+    override end(
+      chunk: string | Buffer | Uint8Array,
+      encoding: BufferEncoding,
+      cb?: () => void,
+    ): this;
+    override end(
+      chunkOrCb?: string | Buffer | Uint8Array | (() => void),
+      encodingOrCb?: BufferEncoding | (() => void),
+      cb?: () => void,
+    ): this {
+      const chunk = typeof chunkOrCb === "function" ? undefined : chunkOrCb;
+      const callback =
+        typeof chunkOrCb === "function"
+          ? chunkOrCb
+          : typeof encodingOrCb === "function"
+            ? encodingOrCb
+            : cb;
+      body = chunk ? String(chunk) : "";
+      callback?.();
+      return this;
+    }
+  }
+
+  const res = new TestServerResponse(createRequest(""));
+  return {
+    res,
+    getBody: () => body,
+  };
+}
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  streamingMode: "partial",
+  config: {},
+};
+
+describe("slash-http cfg threading", () => {
+  beforeEach(async () => {
+    vi.resetModules();
+    mockState.readRequestBodyWithLimit.mockClear();
+    mockState.parseSlashCommandPayload.mockClear();
+    mockState.resolveCommandText.mockClear();
+    mockState.buildModelsProviderData.mockClear();
+    mockState.resolveMattermostModelPickerEntry.mockClear();
+    mockState.authorizeMattermostCommandInvocation.mockClear();
+    mockState.createMattermostClient.mockClear();
+    mockState.fetchMattermostChannel.mockClear();
+    mockState.sendMessageMattermost.mockClear();
+    mockState.normalizeMattermostAllowList.mockClear();
+    mockState.getMattermostCommand.mockClear();
+    mockState.listMattermostCommands.mockClear();
+    ({ createSlashCommandHttpHandler } = await import("./slash-http.js"));
+  });
+
+  it("passes cfg through the no-models slash reply send path", async () => {
+    const cfg = {
+      channels: {
+        mattermost: {
+          botToken: "exec:secret-ref",
+        },
+      },
+    } as OpenClawConfig;
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [
+        {
+          id: "cmd-1",
+          teamId: "team-1",
+          trigger: "oc_models",
+          token: "valid-token",
+          url: callbackUrlFixture,
+          managed: false,
+        },
+      ],
+    });
+    const response = createResponse();
+
+    await handler(createRequest(), response.res);
+
+    expect(response.res.statusCode).toBe(200);
+    expect(response.getBody()).toContain("Processing");
+    expect(mockState.sendMessageMattermost).toHaveBeenCalledWith(
+      "channel:chan-1",
+      "No models available.",
+      expect.objectContaining({
+        cfg,
+        accountId: "default",
+      }),
+    );
+  });
+
+  it("rejects a callback when Mattermost reports a different current command token", async () => {
+    mockState.parseSlashCommandPayload.mockReturnValueOnce({
+      token: "old-token",
+      command: "/oc_models",
+      text: "models",
+      channel_id: "chan-1",
+      user_id: "user-1",
+      user_name: "alice",
+      team_id: "team-1",
+    });
+    mockState.getMattermostCommand.mockResolvedValueOnce({
+      id: "cmd-1",
+      token: "new-token",
+      team_id: "team-1",
+      trigger: "oc_models",
+      method: "P",
+      url: callbackUrlFixture,
+      delete_at: 0,
+    });
+
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [
+        {
+          id: "cmd-1",
+          teamId: "team-1",
+          trigger: "oc_models",
+          token: "old-token",
+          url: callbackUrlFixture,
+          managed: false,
+        },
+      ],
+    });
+    const response = createResponse();
+
+    await handler(createRequest("token=old-token"), response.res);
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+    expect(mockState.fetchMattermostChannel).not.toHaveBeenCalled();
+    expect(mockState.sendMessageMattermost).not.toHaveBeenCalled();
+  });
+
+  it("rejects unknown tokens before calling Mattermost", async () => {
+    mockState.parseSlashCommandPayload.mockReturnValueOnce({
+      token: "unknown-token",
+      command: "/oc_models",
+      text: "models",
+      channel_id: "chan-1",
+      user_id: "user-1",
+      user_name: "alice",
+      team_id: "team-1",
+    });
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [
+        {
+          id: "cmd-1",
+          teamId: "team-1",
+          trigger: "oc_models",
+          token: "valid-token",
+          url: callbackUrlFixture,
+          managed: false,
+        },
+      ],
+    });
+    const response = createResponse();
+
+    await handler(createRequest("token=unknown-token"), response.res);
+
+    expect(response.res.statusCode).toBe(401);
+    expect(mockState.getMattermostCommand).not.toHaveBeenCalled();
+    expect(mockState.fetchMattermostChannel).not.toHaveBeenCalled();
+    expect(mockState.sendMessageMattermost).not.toHaveBeenCalled();
+  });
+
+  it("rejects a refreshed callback token before Mattermost lookup until local state updates", async () => {
+    mockState.parseSlashCommandPayload.mockReturnValueOnce({
+      token: "new-token",
+      command: "/oc_models",
+      text: "models",
+      channel_id: "chan-1",
+      user_id: "user-1",
+      user_name: "alice",
+      team_id: "team-1",
+    });
+    mockState.getMattermostCommand.mockResolvedValueOnce({
+      id: "cmd-1",
+      token: "new-token",
+      team_id: "team-1",
+      trigger: "oc_models",
+      method: "P",
+      url: callbackUrlFixture,
+      delete_at: 0,
+    });
+
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [
+        {
+          id: "cmd-1",
+          teamId: "team-1",
+          trigger: "oc_models",
+          token: "old-token",
+          url: callbackUrlFixture,
+          managed: false,
+        },
+      ],
+    });
+    const response = createResponse();
+
+    await handler(createRequest("token=new-token"), response.res);
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+    expect(mockState.getMattermostCommand).not.toHaveBeenCalled();
+    expect(mockState.fetchMattermostChannel).not.toHaveBeenCalled();
+    expect(mockState.sendMessageMattermost).not.toHaveBeenCalled();
+  });
+});

extensions/mattermost/src/mattermost/slash-http.test.ts

@@ -0,0 +1,926 @@
+// Mattermost tests cover slash http plugin behavior.
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { PassThrough } from "node:stream";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig, RuntimeEnv } from "../../runtime-api.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import type { MattermostClient } from "./client.js";
+import {
+  MATTERMOST_SLASH_POST_METHOD,
+  type MattermostCommandResponse,
+  type MattermostRegisteredCommand,
+} from "./slash-commands.js";
+import {
+  createSlashCommandHttpHandler,
+  resetMattermostSlashCommandValidationCacheForTests,
+  validateMattermostSlashCommandToken,
+} from "./slash-http.js";
+
+function createRequest(params: {
+  method?: string;
+  body?: string;
+  contentType?: string;
+  autoEnd?: boolean;
+}): IncomingMessage {
+  const req = new PassThrough();
+  const incoming = req as PassThrough & IncomingMessage;
+  incoming.method = params.method ?? "POST";
+  incoming.headers = {
+    "content-type": params.contentType ?? "application/x-www-form-urlencoded",
+  };
+  process.nextTick(() => {
+    if (params.body) {
+      req.write(params.body);
+    }
+    if (params.autoEnd !== false) {
+      req.end();
+    }
+  });
+  return incoming;
+}
+
+function createResponse(): {
+  res: ServerResponse;
+  getBody: () => string;
+  getHeaders: () => Map<string, string>;
+} {
+  let body = "";
+  const headers = new Map<string, string>();
+  const res = {
+    statusCode: 200,
+    setHeader(name: string, value: string) {
+      headers.set(name.toLowerCase(), value);
+    },
+    end(chunk?: string | Buffer) {
+      body = chunk ? String(chunk) : "";
+    },
+  } as ServerResponse;
+  return {
+    res,
+    getBody: () => body,
+    getHeaders: () => headers,
+  };
+}
+
+const accountFixture: ResolvedMattermostAccount = {
+  accountId: "default",
+  enabled: true,
+  botToken: "bot-token",
+  baseUrl: "https://chat.example.com",
+  botTokenSource: "config",
+  baseUrlSource: "config",
+  streamingMode: "partial",
+  config: {},
+};
+
+function createRegisteredCommand(params?: {
+  token?: string;
+  teamId?: string;
+  trigger?: string;
+  url?: string;
+}): MattermostRegisteredCommand {
+  return {
+    id: "cmd-1",
+    teamId: params?.teamId ?? "t1",
+    trigger: params?.trigger ?? "oc_status",
+    token: params?.token ?? "valid-token",
+    url: params?.url ?? "https://gateway.example.com/slash",
+    managed: false,
+  };
+}
+
+function createCommandLookupClient(params: {
+  command?: MattermostCommandResponse | null | (() => MattermostCommandResponse | null);
+  commandLookupError?: Error;
+  listLookupError?: Error;
+  listCommands?: MattermostCommandResponse[];
+}): MattermostClient & { requests: string[] } {
+  const requests: string[] = [];
+  return {
+    baseUrl: "https://chat.example.com",
+    apiBaseUrl: "https://chat.example.com/api/v4",
+    token: "bot-token",
+    request: async <T>(path: string) => {
+      requests.push(path);
+      if (path === "/commands/cmd-1") {
+        if (params.commandLookupError) {
+          throw params.commandLookupError;
+        }
+        const command = typeof params.command === "function" ? params.command() : params.command;
+        if (command) {
+          return command as T;
+        }
+        throw new Error("not found");
+      }
+      if (path.startsWith("/commands?team_id=")) {
+        if (params.listLookupError) {
+          throw params.listLookupError;
+        }
+        const command = typeof params.command === "function" ? params.command() : params.command;
+        return (params.listCommands ?? (command ? [command] : [])) as T;
+      }
+      throw new Error(`unexpected request path: ${path}`);
+    },
+    fetchImpl: vi.fn<typeof fetch>(),
+    requests,
+  };
+}
+
+async function runSlashRequest(params: {
+  registeredCommands?: MattermostRegisteredCommand[];
+  body: string;
+  method?: string;
+}) {
+  const handler = createSlashCommandHttpHandler({
+    account: accountFixture,
+    cfg: {} as OpenClawConfig,
+    runtime: {} as RuntimeEnv,
+    registeredCommands: params.registeredCommands ?? [],
+  });
+  const req = createRequest({ method: params.method, body: params.body });
+  const response = createResponse();
+  await handler(req, response.res);
+  return response;
+}
+
+function firstLogMessage(log: ReturnType<typeof vi.fn>): string {
+  const message = log.mock.calls[0]?.[0];
+  return typeof message === "string" ? message : "";
+}
+
+describe("slash-http", () => {
+  beforeEach(() => {
+    resetMattermostSlashCommandValidationCacheForTests();
+  });
+
+  it("rejects non-POST methods", async () => {
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [createRegisteredCommand()],
+    });
+    const req = createRequest({ method: "GET", body: "" });
+    const response = createResponse();
+
+    await handler(req, response.res);
+
+    expect(response.res.statusCode).toBe(405);
+    expect(response.getBody()).toBe("Method Not Allowed");
+    expect(response.getHeaders().get("allow")).toBe("POST");
+  });
+
+  it("rejects malformed payloads", async () => {
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [createRegisteredCommand()],
+    });
+    const req = createRequest({ body: "token=abc&command=%2Foc_status" });
+    const response = createResponse();
+
+    await handler(req, response.res);
+
+    expect(response.res.statusCode).toBe(400);
+    expect(response.getBody()).toContain("Invalid slash command payload");
+  });
+
+  it("fails closed when no commands are registered", async () => {
+    const response = await runSlashRequest({
+      registeredCommands: [],
+      body: "token=tok1&team_id=t1&channel_id=c1&user_id=u1&command=%2Foc_status&text=",
+    });
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+  });
+
+  it("rejects unknown slash commands before upstream validation", async () => {
+    const response = await runSlashRequest({
+      registeredCommands: [createRegisteredCommand({ token: "known-token" })],
+      body: "token=unknown&team_id=t1&channel_id=c1&user_id=u1&command=%2Foc_unknown&text=",
+    });
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+  });
+
+  it("rejects a token valid for one command when used against another command", async () => {
+    // Cross-command spray DoS guard: a payload pointing at command B with the
+    // token for command A must fail at the per-command startup gate, before
+    // upstream validation runs and could poison the failure cache for B.
+    const response = await runSlashRequest({
+      registeredCommands: [
+        createRegisteredCommand({ token: "token-status", trigger: "oc_status" }),
+        {
+          id: "cmd-2",
+          teamId: "t1",
+          trigger: "oc_help",
+          token: "token-help",
+          url: "https://gateway.example.com/slash",
+          managed: false,
+        },
+      ],
+      body: "token=token-status&team_id=t1&channel_id=c1&user_id=u1&command=%2Foc_help&text=",
+    });
+
+    expect(response.res.statusCode).toBe(401);
+    expect(response.getBody()).toContain("Unauthorized: invalid command token.");
+  });
+
+  it("returns 408 when the request body stalls", async () => {
+    const handler = createSlashCommandHttpHandler({
+      account: accountFixture,
+      cfg: {} as OpenClawConfig,
+      runtime: {} as RuntimeEnv,
+      registeredCommands: [createRegisteredCommand()],
+      bodyTimeoutMs: 1,
+    });
+    const req = createRequest({ autoEnd: false });
+    const response = createResponse();
+
+    await handler(req, response.res);
+
+    expect(response.res.statusCode).toBe(408);
+    expect(response.getBody()).toBe("Request body timeout");
+  });
+
+  it("rejects the startup token when Mattermost has rotated the current command token", async () => {
+    const registeredCommand = createRegisteredCommand({ token: "old-token" });
+    const client = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "new-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "old-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(false);
+
+    expect(registeredCommand.token).toBe("old-token");
+  });
+
+  it("accepts the startup token while the current Mattermost command still matches", async () => {
+    const registeredCommand = createRegisteredCommand({ token: "valid-token" });
+    const client = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(true);
+  });
+
+  it("rate-limits sequential current-command lookups without caching successes", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-04-27T00:00:00Z"));
+    try {
+      const registeredCommand = createRegisteredCommand({ token: "valid-token" });
+      const command = {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      };
+      const client = createCommandLookupClient({ command });
+      const payload = {
+        token: "valid-token",
+        team_id: "t1",
+        channel_id: "c1",
+        user_id: "u1",
+        command: "/oc_status",
+        text: "",
+      };
+      const log = vi.fn();
+
+      for (let i = 0; i < 20; i += 1) {
+        await expect(
+          validateMattermostSlashCommandToken({
+            accountId: "default",
+            client,
+            registeredCommand,
+            payload,
+            log,
+          }),
+        ).resolves.toBe(true);
+      }
+      await expect(
+        validateMattermostSlashCommandToken({
+          accountId: "default",
+          client,
+          registeredCommand,
+          payload,
+          log,
+        }),
+      ).resolves.toBe(false);
+
+      expect(client.requests).toHaveLength(20);
+      expect(log).toHaveBeenCalledWith(
+        "mattermost: slash command validation lookup rate-limited for /oc_status",
+      );
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("rechecks matching current commands so startup tokens are not accepted after rotation", async () => {
+    const registeredCommand = createRegisteredCommand({ token: "valid-token" });
+    let command = {
+      id: "cmd-1",
+      token: "valid-token",
+      team_id: "t1",
+      trigger: "oc_status",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 0,
+    };
+    const client = createCommandLookupClient({
+      command: () => command,
+    });
+    const payload = {
+      token: "valid-token",
+      team_id: "t1",
+      channel_id: "c1",
+      user_id: "u1",
+      command: "/oc_status",
+      text: "",
+    };
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload,
+      }),
+    ).resolves.toBe(true);
+    command = {
+      ...command,
+      token: "new-token",
+    };
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload,
+      }),
+    ).resolves.toBe(false);
+
+    expect(client.requests).toEqual(["/commands/cmd-1", "/commands/cmd-1"]);
+  });
+
+  it("briefly caches failed current command validation without accepting stale tokens", async () => {
+    const registeredCommand = createRegisteredCommand({ token: "old-token" });
+    const client = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "new-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    });
+    const payload = {
+      token: "old-token",
+      team_id: "t1",
+      channel_id: "c1",
+      user_id: "u1",
+      command: "/oc_status",
+      text: "",
+    };
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload,
+      }),
+    ).resolves.toBe(false);
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload,
+      }),
+    ).resolves.toBe(false);
+
+    expect(client.requests).toEqual(["/commands/cmd-1"]);
+  });
+
+  it("does not cache failed command validation when the expiry would exceed a valid Date", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date(8_640_000_000_000_000));
+    try {
+      const registeredCommand = createRegisteredCommand({ token: "old-token" });
+      const client = createCommandLookupClient({
+        command: {
+          id: "cmd-1",
+          token: "new-token",
+          team_id: "t1",
+          trigger: "oc_status",
+          method: MATTERMOST_SLASH_POST_METHOD,
+          url: "https://gateway.example.com/slash",
+          auto_complete: true,
+          delete_at: 0,
+        },
+      });
+      const payload = {
+        token: "old-token",
+        team_id: "t1",
+        channel_id: "c1",
+        user_id: "u1",
+        command: "/oc_status",
+        text: "",
+      };
+
+      await expect(
+        validateMattermostSlashCommandToken({
+          accountId: "default",
+          client,
+          registeredCommand,
+          payload,
+        }),
+      ).resolves.toBe(false);
+      await expect(
+        validateMattermostSlashCommandToken({
+          accountId: "default",
+          client,
+          registeredCommand,
+          payload,
+        }),
+      ).resolves.toBe(false);
+
+      expect(client.requests).toEqual(["/commands/cmd-1", "/commands/cmd-1"]);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("drops exhausted validation lookup buckets when the current clock is invalid", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-04-27T00:00:00Z"));
+    try {
+      const registeredCommand = createRegisteredCommand({ token: "valid-token" });
+      const command = {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      };
+      const client = createCommandLookupClient({ command });
+      const payload = {
+        token: "valid-token",
+        team_id: "t1",
+        channel_id: "c1",
+        user_id: "u1",
+        command: "/oc_status",
+        text: "",
+      };
+
+      for (let i = 0; i < 20; i += 1) {
+        await expect(
+          validateMattermostSlashCommandToken({
+            accountId: "default",
+            client,
+            registeredCommand,
+            payload,
+          }),
+        ).resolves.toBe(true);
+      }
+      await expect(
+        validateMattermostSlashCommandToken({
+          accountId: "default",
+          client,
+          registeredCommand,
+          payload,
+        }),
+      ).resolves.toBe(false);
+
+      const dateNow = vi.spyOn(Date, "now").mockReturnValue(Number.NaN);
+      try {
+        await expect(
+          validateMattermostSlashCommandToken({
+            accountId: "default",
+            client,
+            registeredCommand,
+            payload,
+          }),
+        ).resolves.toBe(true);
+      } finally {
+        dateNow.mockRestore();
+      }
+
+      expect(client.requests).toHaveLength(21);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("scopes validation cache entries by account", async () => {
+    const registeredCommand = createRegisteredCommand();
+    const clientA = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "token-a",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    });
+    const clientB = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "token-b",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "a1",
+        client: clientA,
+        registeredCommand,
+        payload: {
+          token: "token-a",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(true);
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "a2",
+        client: clientB,
+        registeredCommand,
+        payload: {
+          token: "token-b",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(true);
+
+    expect(clientA.requests).toEqual(["/commands/cmd-1"]);
+    expect(clientB.requests).toEqual(["/commands/cmd-1"]);
+  });
+
+  it("rejects a command that Mattermost reports as deleted", async () => {
+    const registeredCommand = createRegisteredCommand();
+    const client = createCommandLookupClient({
+      command: {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 123,
+      },
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(false);
+  });
+
+  it("rejects a regenerated command when the current command id changed", async () => {
+    const registeredCommand = createRegisteredCommand({ token: "old-token" });
+    const oldDeletedCommand = {
+      id: "cmd-1",
+      token: "old-token",
+      team_id: "t1",
+      trigger: "oc_status",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 123,
+    };
+    const newCommand = {
+      id: "cmd-2",
+      token: "new-token",
+      team_id: "t1",
+      trigger: "oc_status",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 0,
+    };
+    const client = createCommandLookupClient({
+      command: oldDeletedCommand,
+      listCommands: [oldDeletedCommand, newCommand],
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "new-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(false);
+    expect(client.requests).toEqual(["/commands/cmd-1", "/commands?team_id=t1&custom_only=true"]);
+  });
+
+  it("logs when command lookup by id returns a deleted command before fallback", async () => {
+    const registeredCommand = createRegisteredCommand();
+    const command = {
+      id: "cmd-1\r\nspoofed",
+      token: "valid-token",
+      team_id: "t1",
+      trigger: "oc_status",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 123,
+    };
+    const client = createCommandLookupClient({
+      command,
+      listCommands: [],
+    });
+    const log = vi.fn();
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+        log,
+      }),
+    ).resolves.toBe(false);
+
+    expect(log).toHaveBeenCalledTimes(1);
+    const message = firstLogMessage(log);
+    expect(message).not.toMatch(/[\r\n\t]/u);
+    expect(message).toContain("deleted command cmd-1  spoofed");
+    expect(message).toContain("using team list fallback");
+  });
+
+  it("rejects current commands with a mismatched method or callback URL", async () => {
+    const registeredCommand = createRegisteredCommand();
+
+    for (const command of [
+      {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: "G",
+        url: "https://gateway.example.com/slash",
+        auto_complete: true,
+        delete_at: 0,
+      },
+      {
+        id: "cmd-1",
+        token: "valid-token",
+        team_id: "t1",
+        trigger: "oc_status",
+        method: MATTERMOST_SLASH_POST_METHOD,
+        url: "https://gateway.example.com/other",
+        auto_complete: true,
+        delete_at: 0,
+      },
+    ]) {
+      resetMattermostSlashCommandValidationCacheForTests();
+      const client = createCommandLookupClient({ command });
+
+      await expect(
+        validateMattermostSlashCommandToken({
+          accountId: "default",
+          client,
+          registeredCommand,
+          payload: {
+            token: "valid-token",
+            team_id: "t1",
+            channel_id: "c1",
+            user_id: "u1",
+            command: "/oc_status",
+            text: "",
+          },
+        }),
+      ).resolves.toBe(false);
+    }
+  });
+
+  it("falls back to the team command list when command lookup is unavailable", async () => {
+    const registeredCommand = createRegisteredCommand();
+    const command = {
+      id: "cmd-1",
+      token: "valid-token",
+      team_id: "t1",
+      trigger: "oc_status",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 0,
+    };
+    const client = createCommandLookupClient({
+      commandLookupError: new Error("not implemented"),
+      listCommands: [command],
+    });
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+      }),
+    ).resolves.toBe(true);
+    expect(client.requests).toEqual(["/commands/cmd-1", "/commands?team_id=t1&custom_only=true"]);
+  });
+
+  it("logs sanitized command lookup failures when falling back to the team command list", async () => {
+    const registeredCommand = createRegisteredCommand({ trigger: "oc_status\r\nspoofed" });
+    const command = {
+      id: "cmd-1",
+      token: "valid-token",
+      team_id: "t1",
+      trigger: "oc_status\r\nspoofed",
+      method: MATTERMOST_SLASH_POST_METHOD,
+      url: "https://gateway.example.com/slash",
+      auto_complete: true,
+      delete_at: 0,
+    };
+    const client = createCommandLookupClient({
+      commandLookupError: new Error(
+        "primary\ntoken=secret-token https://user:pass@chat.example.com/api?access_token=secret-access&client_secret=secret-client",
+      ),
+      listCommands: [command],
+    });
+    const log = vi.fn();
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+        log,
+      }),
+    ).resolves.toBe(true);
+
+    expect(log).toHaveBeenCalledTimes(1);
+    const message = firstLogMessage(log);
+    expect(message).not.toMatch(/[\r\n\t]/u);
+    expect(message).toContain("/oc_status  spoofed");
+    expect(message).toContain("primary token=[redacted]");
+    expect(message).toContain("https://redacted:redacted@chat.example.com/api");
+    expect(message).not.toContain("secret-token");
+    expect(message).not.toContain("secret-access");
+    expect(message).not.toContain("secret-client");
+    expect(message).not.toContain("user:pass");
+  });
+
+  it("sanitizes upstream lookup errors before logging fallback failures", async () => {
+    const registeredCommand = createRegisteredCommand();
+    const client = createCommandLookupClient({
+      commandLookupError: new Error('primary\ntoken=secret-token refresh_token="secret-refresh"'),
+      listLookupError: new Error(
+        "fallback\r\nsecond-line botToken: secret-bot https://user:pass@chat.example.com/hooks?token=secret-query",
+      ),
+    });
+    const log = vi.fn();
+
+    await expect(
+      validateMattermostSlashCommandToken({
+        accountId: "default",
+        client,
+        registeredCommand,
+        payload: {
+          token: "valid-token",
+          team_id: "t1",
+          channel_id: "c1",
+          user_id: "u1",
+          command: "/oc_status",
+          text: "",
+        },
+        log,
+      }),
+    ).resolves.toBe(false);
+
+    expect(log).toHaveBeenCalledTimes(1);
+    const message = firstLogMessage(log);
+    expect(message).not.toMatch(/[\r\n\t]/u);
+    expect(message).toContain("fallback  second-line");
+    expect(message).toContain("botToken: [redacted]");
+    expect(message).toContain("https://redacted:redacted@chat.example.com/hooks");
+    expect(message).toContain("primary token=[redacted]");
+    expect(message).not.toContain("secret-token");
+    expect(message).not.toContain("secret-refresh");
+    expect(message).not.toContain("secret-bot");
+    expect(message).not.toContain("secret-query");
+    expect(message).not.toContain("user:pass");
+  });
+});

extensions/mattermost/src/mattermost/slash-http.ts

@@ -0,0 +1,947 @@
+/**
+ * HTTP callback handler for Mattermost slash commands.
+ *
+ * Receives POST requests from Mattermost when a slash command is invoked,
+ * validates the token, and routes the command through the standard inbound pipeline.
+ */
+
+import type { IncomingMessage, ServerResponse } from "node:http";
+import {
+  asDateTimestampMs,
+  resolveExpiresAtMsFromDurationMs,
+} from "openclaw/plugin-sdk/number-runtime";
+import { safeEqualSecret } from "openclaw/plugin-sdk/security-runtime";
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import type { ResolvedMattermostAccount } from "../mattermost/accounts.js";
+import { getMattermostRuntime } from "../runtime.js";
+import {
+  createMattermostClient,
+  fetchMattermostChannel,
+  sendMattermostTyping,
+  type MattermostChannel,
+} from "./client.js";
+import {
+  renderMattermostModelSummaryView,
+  renderMattermostModelsPickerView,
+  renderMattermostProviderPickerView,
+  resolveMattermostModelPickerCurrentModel,
+  resolveMattermostModelPickerEntry,
+} from "./model-picker.js";
+import {
+  authorizeMattermostCommandInvocation,
+  normalizeMattermostAllowList,
+} from "./monitor-auth.js";
+import {
+  createMattermostReplyDeliveryBarrier,
+  deliverMattermostReplyPayload,
+} from "./reply-delivery.js";
+import {
+  buildModelsProviderData,
+  createChannelMessageReplyPipeline,
+  isRequestBodyLimitError,
+  logTypingFailure,
+  readRequestBodyWithLimit,
+  type OpenClawConfig,
+  type ReplyPayload,
+  type RuntimeEnv,
+} from "./runtime-api.js";
+import { sendMessageMattermost } from "./send.js";
+import {
+  MATTERMOST_SLASH_POST_METHOD,
+  getMattermostCommand,
+  listMattermostCommands,
+  normalizeSlashCommandTrigger,
+  parseSlashCommandPayload,
+  resolveCommandText,
+  type MattermostRegisteredCommand,
+  type MattermostCommandResponse,
+  type MattermostSlashCommandResponse,
+  type MattermostSlashCommandPayload,
+} from "./slash-commands.js";
+
+type SlashHttpHandlerParams = {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  /** Commands registered or reconciled during monitor startup. */
+  registeredCommands: readonly MattermostRegisteredCommand[];
+  /** Map from trigger to original command name (for skill commands that start with oc_). */
+  triggerMap?: ReadonlyMap<string, string>;
+  log?: (msg: string) => void;
+  bodyTimeoutMs?: number;
+};
+
+const MAX_BODY_BYTES = 64 * 1024;
+const BODY_READ_TIMEOUT_MS = 5_000;
+const COMMAND_LOOKUP_TIMEOUT_MS = 1_000;
+const COMMAND_VALIDATION_FAILURE_CACHE_MS = 5_000;
+const COMMAND_VALIDATION_FAILURE_CACHE_MAX_KEYS = 2_000;
+const COMMAND_VALIDATION_LOOKUP_BURST = 20;
+const COMMAND_VALIDATION_LOOKUP_REFILL_MS = 500;
+const COMMAND_VALIDATION_LOOKUP_LIMIT_LOG_MS = 5_000;
+const COMMAND_VALIDATION_LOOKUP_RATE_LIMIT_MAX_KEYS = 2_000;
+type CommandLookupInflightEntry = {
+  accountId: string;
+  promise: Promise<MattermostCommandResponse | null>;
+};
+type CommandValidationRateLimitEntry = {
+  accountId: string;
+  tokens: number;
+  updatedAt: number;
+  lastLimitedLogAt: number;
+};
+const commandLookupInflight = new Map<string, CommandLookupInflightEntry>();
+const commandValidationFailureCache = new Map<string, { accountId: string; expiresAt: number }>();
+const commandValidationLookupRateLimit = new Map<string, CommandValidationRateLimitEntry>();
+const SECRET_LOG_KEYS = new Set([
+  "access_token",
+  "authorization",
+  "bottoken",
+  "client_secret",
+  "refresh_token",
+  "token",
+]);
+
+/**
+ * Read the full request body as a string.
+ */
+function readBody(
+  req: IncomingMessage,
+  maxBytes: number,
+  timeoutMs = BODY_READ_TIMEOUT_MS,
+): Promise<string> {
+  return readRequestBodyWithLimit(req, {
+    maxBytes,
+    timeoutMs,
+  });
+}
+
+function sendJsonResponse(
+  res: ServerResponse,
+  status: number,
+  body: MattermostSlashCommandResponse,
+) {
+  res.statusCode = status;
+  res.setHeader("Content-Type", "application/json; charset=utf-8");
+  res.end(JSON.stringify(body));
+}
+
+function findRegisteredCommandForPayload(params: {
+  registeredCommands: readonly MattermostRegisteredCommand[];
+  payload: MattermostSlashCommandPayload;
+}): MattermostRegisteredCommand | undefined {
+  const trigger = normalizeSlashCommandTrigger(params.payload.command);
+  return params.registeredCommands.find(
+    (cmd) => cmd.teamId === params.payload.team_id && cmd.trigger === trigger,
+  );
+}
+
+function isDeletedMattermostCommand(command: { delete_at?: number }): boolean {
+  return typeof command.delete_at === "number" && command.delete_at > 0;
+}
+
+function sanitizeCommandLookupError(error: unknown): string {
+  const raw = error instanceof Error ? error.message : String(error);
+  return raw
+    .replace(/[\r\n\t]/gu, " ")
+    .replace(/https?:\/\/[^\s)\]}]+/giu, (urlText) => {
+      try {
+        const url = new URL(urlText);
+        if (url.username || url.password) {
+          url.username = "redacted";
+          url.password = "redacted";
+        }
+        for (const key of url.searchParams.keys()) {
+          if (SECRET_LOG_KEYS.has(key.toLowerCase())) {
+            url.searchParams.set(key, "redacted");
+          }
+        }
+        return url.toString();
+      } catch {
+        return urlText;
+      }
+    })
+    .replace(/(^|[^\w-])(Bearer|Token)\s+[A-Za-z0-9._~+/=-]+/giu, "$1$2 [redacted]")
+    .replace(
+      /\b(token|authorization|access_token|refresh_token|client_secret|botToken)\b(\s*["']?\s*(?:=|:)\s*["']?)[^"',\s;}]+/giu,
+      "$1$2[redacted]",
+    )
+    .slice(0, 300);
+}
+
+function sanitizeMattermostLogValue(value: string): string {
+  return value.replace(/[\r\n\t]/gu, " ").slice(0, 200);
+}
+
+async function withCommandLookupTimeout<T>(task: (signal: AbortSignal) => Promise<T>): Promise<T> {
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), COMMAND_LOOKUP_TIMEOUT_MS);
+  try {
+    return await task(controller.signal);
+  } finally {
+    clearTimeout(timeout);
+  }
+}
+
+function commandLookupKey(
+  client: ReturnType<typeof createMattermostClient>,
+  registered: MattermostRegisteredCommand,
+  accountId: string,
+): string {
+  return `${client.apiBaseUrl}:${accountId}:${registered.teamId}:${registered.id}`;
+}
+
+export function resetMattermostSlashCommandValidationCacheForTests(): void {
+  commandLookupInflight.clear();
+  commandValidationFailureCache.clear();
+  commandValidationLookupRateLimit.clear();
+}
+
+export function clearMattermostSlashCommandValidationCacheForAccount(accountId: string): void {
+  for (const [key, entry] of commandValidationFailureCache) {
+    if (entry.accountId === accountId) {
+      commandValidationFailureCache.delete(key);
+    }
+  }
+  for (const [key, entry] of commandLookupInflight) {
+    if (entry.accountId === accountId) {
+      commandLookupInflight.delete(key);
+    }
+  }
+  for (const [key, entry] of commandValidationLookupRateLimit) {
+    if (entry.accountId === accountId) {
+      commandValidationLookupRateLimit.delete(key);
+    }
+  }
+}
+
+function sweepCommandValidationFailureCache(now = Date.now()): void {
+  const validNow = asDateTimestampMs(now);
+  if (validNow === undefined) {
+    commandValidationFailureCache.clear();
+    return;
+  }
+  for (const [key, entry] of commandValidationFailureCache) {
+    const expiresAt = asDateTimestampMs(entry.expiresAt);
+    if (expiresAt === undefined || expiresAt <= validNow) {
+      commandValidationFailureCache.delete(key);
+    }
+  }
+  while (commandValidationFailureCache.size > COMMAND_VALIDATION_FAILURE_CACHE_MAX_KEYS) {
+    const oldestKey = commandValidationFailureCache.keys().next().value;
+    if (!oldestKey) {
+      break;
+    }
+    commandValidationFailureCache.delete(oldestKey);
+  }
+}
+
+function hasCachedCommandValidationFailure(key: string, now = Date.now()): boolean {
+  sweepCommandValidationFailureCache(now);
+  const validNow = asDateTimestampMs(now);
+  if (validNow === undefined) {
+    return false;
+  }
+  const cached = commandValidationFailureCache.get(key);
+  if (!cached) {
+    return false;
+  }
+  const expiresAt = asDateTimestampMs(cached.expiresAt);
+  if (expiresAt !== undefined && expiresAt > validNow) {
+    return true;
+  }
+  commandValidationFailureCache.delete(key);
+  return false;
+}
+
+function cacheCommandValidationFailure(key: string, accountId: string): void {
+  const now = Date.now();
+  sweepCommandValidationFailureCache(now);
+  const expiresAt = resolveExpiresAtMsFromDurationMs(COMMAND_VALIDATION_FAILURE_CACHE_MS, {
+    nowMs: now,
+  });
+  if (expiresAt === undefined) {
+    commandValidationFailureCache.delete(key);
+    return;
+  }
+  commandValidationFailureCache.set(key, {
+    accountId,
+    expiresAt,
+  });
+}
+
+function sweepCommandValidationLookupRateLimit(now = Date.now()): void {
+  const validNow = asDateTimestampMs(now);
+  if (validNow === undefined) {
+    commandValidationLookupRateLimit.clear();
+    return;
+  }
+  const staleAfterMs = COMMAND_VALIDATION_LOOKUP_REFILL_MS * COMMAND_VALIDATION_LOOKUP_BURST * 2;
+  for (const [key, entry] of commandValidationLookupRateLimit) {
+    const updatedAt = asDateTimestampMs(entry.updatedAt);
+    if (updatedAt === undefined || validNow - updatedAt > staleAfterMs) {
+      commandValidationLookupRateLimit.delete(key);
+    }
+  }
+  while (commandValidationLookupRateLimit.size > COMMAND_VALIDATION_LOOKUP_RATE_LIMIT_MAX_KEYS) {
+    const oldestKey = commandValidationLookupRateLimit.keys().next().value;
+    if (!oldestKey) {
+      break;
+    }
+    commandValidationLookupRateLimit.delete(oldestKey);
+  }
+}
+
+function reserveCommandValidationLookup(params: {
+  key: string;
+  accountId: string;
+  now?: number;
+}): { allowed: true } | { allowed: false; shouldLog: boolean } {
+  const rawNow = params.now ?? Date.now();
+  const now = asDateTimestampMs(rawNow);
+  if (now === undefined) {
+    commandValidationLookupRateLimit.clear();
+    return { allowed: true };
+  }
+  sweepCommandValidationLookupRateLimit(now);
+  const existing = commandValidationLookupRateLimit.get(params.key);
+  if (!existing) {
+    commandValidationLookupRateLimit.set(params.key, {
+      accountId: params.accountId,
+      tokens: COMMAND_VALIDATION_LOOKUP_BURST - 1,
+      updatedAt: now,
+      lastLimitedLogAt: 0,
+    });
+    return { allowed: true };
+  }
+
+  const refill = Math.floor((now - existing.updatedAt) / COMMAND_VALIDATION_LOOKUP_REFILL_MS);
+  if (refill > 0) {
+    existing.tokens = Math.min(COMMAND_VALIDATION_LOOKUP_BURST, existing.tokens + refill);
+    existing.updatedAt += refill * COMMAND_VALIDATION_LOOKUP_REFILL_MS;
+  }
+  if (existing.tokens <= 0) {
+    const shouldLog = now - existing.lastLimitedLogAt >= COMMAND_VALIDATION_LOOKUP_LIMIT_LOG_MS;
+    if (shouldLog) {
+      existing.lastLimitedLogAt = now;
+    }
+    return { allowed: false, shouldLog };
+  }
+  existing.tokens -= 1;
+  return { allowed: true };
+}
+
+async function fetchCurrentMattermostCommandUncached(params: {
+  client: ReturnType<typeof createMattermostClient>;
+  registered: MattermostRegisteredCommand;
+  log?: (msg: string) => void;
+}): Promise<MattermostCommandResponse | null> {
+  let commandLookupResult: MattermostCommandResponse | null = null;
+  let commandLookupError: unknown;
+  let commandLookupFallbackDetail: string | undefined;
+  try {
+    commandLookupResult = await withCommandLookupTimeout((signal) =>
+      getMattermostCommand(params.client, params.registered.id, { signal }),
+    );
+    if (!isDeletedMattermostCommand(commandLookupResult)) {
+      return commandLookupResult;
+    }
+    commandLookupFallbackDetail = `command lookup by id returned deleted command ${sanitizeMattermostLogValue(commandLookupResult.id)}`;
+  } catch (err) {
+    commandLookupError = err;
+    // Older Mattermost servers may not expose GET /commands/{id}; fall back to
+    // the team command list, which registration already requires.
+  }
+
+  try {
+    const currentCommands = await withCommandLookupTimeout((signal) =>
+      listMattermostCommands(params.client, params.registered.teamId, { signal }),
+    );
+    if (commandLookupError) {
+      params.log?.(
+        `mattermost: slash command lookup by id failed for /${sanitizeMattermostLogValue(params.registered.trigger)}; using team list fallback: ${sanitizeCommandLookupError(commandLookupError)}`,
+      );
+    } else if (commandLookupFallbackDetail) {
+      params.log?.(
+        `mattermost: slash ${commandLookupFallbackDetail} for /${sanitizeMattermostLogValue(params.registered.trigger)}; using team list fallback`,
+      );
+    }
+    return currentCommands.find((cmd) => cmd.id === params.registered.id) ?? commandLookupResult;
+  } catch (err) {
+    const primaryDetail = commandLookupError
+      ? `; command lookup: ${sanitizeCommandLookupError(commandLookupError)}`
+      : commandLookupFallbackDetail
+        ? `; command lookup: ${commandLookupFallbackDetail}`
+        : "";
+    params.log?.(
+      `mattermost: slash command registration check failed for /${sanitizeMattermostLogValue(params.registered.trigger)}: ${sanitizeCommandLookupError(err)}${primaryDetail}`,
+    );
+    return null;
+  }
+}
+
+async function fetchCurrentMattermostCommand(params: {
+  accountId: string;
+  client: ReturnType<typeof createMattermostClient>;
+  registered: MattermostRegisteredCommand;
+  log?: (msg: string) => void;
+}): Promise<MattermostCommandResponse | null> {
+  const key = commandLookupKey(params.client, params.registered, params.accountId);
+  const existing = commandLookupInflight.get(key);
+  if (existing) {
+    return await existing.promise;
+  }
+
+  const lookup = fetchCurrentMattermostCommandUncached(params).finally(() => {
+    commandLookupInflight.delete(key);
+  });
+  commandLookupInflight.set(key, { accountId: params.accountId, promise: lookup });
+  return await lookup;
+}
+
+export async function validateMattermostSlashCommandToken(params: {
+  accountId: string;
+  client: ReturnType<typeof createMattermostClient>;
+  registeredCommand: MattermostRegisteredCommand;
+  payload: MattermostSlashCommandPayload;
+  log?: (msg: string) => void;
+}): Promise<boolean> {
+  const lookupKey = commandLookupKey(params.client, params.registeredCommand, params.accountId);
+  if (hasCachedCommandValidationFailure(lookupKey)) {
+    return false;
+  }
+  if (!commandLookupInflight.has(lookupKey)) {
+    const reservation = reserveCommandValidationLookup({
+      key: lookupKey,
+      accountId: params.accountId,
+    });
+    if (!reservation.allowed) {
+      if (reservation.shouldLog) {
+        params.log?.(
+          `mattermost: slash command validation lookup rate-limited for /${sanitizeMattermostLogValue(params.registeredCommand.trigger)}`,
+        );
+      }
+      return false;
+    }
+  }
+  const current = await fetchCurrentMattermostCommand({
+    accountId: params.accountId,
+    client: params.client,
+    registered: params.registeredCommand,
+    log: params.log,
+  });
+  if (!current || isDeletedMattermostCommand(current)) {
+    cacheCommandValidationFailure(lookupKey, params.accountId);
+    return false;
+  }
+  if (
+    current.id !== params.registeredCommand.id ||
+    current.team_id !== params.registeredCommand.teamId ||
+    current.trigger !== params.registeredCommand.trigger ||
+    current.method !== MATTERMOST_SLASH_POST_METHOD ||
+    current.url !== params.registeredCommand.url
+  ) {
+    cacheCommandValidationFailure(lookupKey, params.accountId);
+    return false;
+  }
+  if (!current.token || !safeEqualSecret(params.payload.token, current.token)) {
+    cacheCommandValidationFailure(lookupKey, params.accountId);
+    return false;
+  }
+  commandValidationFailureCache.delete(lookupKey);
+  return true;
+}
+
+type SlashInvocationAuth = {
+  ok: boolean;
+  denyResponse?: MattermostSlashCommandResponse;
+  commandAuthorized: boolean;
+  channelInfo: MattermostChannel | null;
+  kind: "direct" | "group" | "channel";
+  chatType: "direct" | "group" | "channel";
+  channelName: string;
+  channelDisplay: string;
+  roomLabel: string;
+};
+
+async function authorizeSlashInvocation(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  client: ReturnType<typeof createMattermostClient>;
+  commandText: string;
+  channelId: string;
+  senderId: string;
+  senderName: string;
+  log?: (msg: string) => void;
+}): Promise<SlashInvocationAuth> {
+  const { account, cfg, client, commandText, channelId, senderId, senderName, log } = params;
+  const core = getMattermostRuntime();
+
+  // Resolve channel info so we can enforce DM vs group/channel policies.
+  let channelInfo: MattermostChannel | null = null;
+  try {
+    channelInfo = await fetchMattermostChannel(client, channelId);
+  } catch (err) {
+    log?.(
+      `mattermost: slash channel lookup failed for ${sanitizeMattermostLogValue(channelId)}: ${sanitizeCommandLookupError(err)}`,
+    );
+  }
+
+  if (!channelInfo) {
+    return {
+      ok: false,
+      denyResponse: {
+        response_type: "ephemeral",
+        text: "Temporary error: unable to determine channel type. Please try again.",
+      },
+      commandAuthorized: false,
+      channelInfo: null,
+      kind: "channel",
+      chatType: "channel",
+      channelName: "",
+      channelDisplay: "",
+      roomLabel: `#${channelId}`,
+    };
+  }
+
+  const allowTextCommands = core.channel.commands.shouldHandleTextCommands({
+    cfg,
+    surface: "mattermost",
+  });
+  const hasControlCommand = core.channel.text.hasControlCommand(commandText, cfg);
+  const storeAllowFrom = normalizeMattermostAllowList(
+    await core.channel.pairing
+      .readAllowFromStore({
+        channel: "mattermost",
+        accountId: account.accountId,
+      })
+      .catch(() => []),
+  );
+  const decision = await authorizeMattermostCommandInvocation({
+    account,
+    cfg,
+    senderId,
+    senderName,
+    channelId,
+    channelInfo,
+    storeAllowFrom,
+    allowTextCommands,
+    hasControlCommand,
+  });
+
+  if (!decision.ok) {
+    if (decision.denyReason === "dm-pairing") {
+      const { code } = await core.channel.pairing.upsertPairingRequest({
+        channel: "mattermost",
+        accountId: account.accountId,
+        id: senderId,
+        meta: { name: senderName },
+      });
+      return {
+        ...decision,
+        denyResponse: {
+          response_type: "ephemeral",
+          text: core.channel.pairing.buildPairingReply({
+            channel: "mattermost",
+            idLine: `Your Mattermost user id: ${senderId}`,
+            code,
+          }),
+        },
+      };
+    }
+
+    const denyText =
+      decision.denyReason === "unknown-channel"
+        ? "Temporary error: unable to determine channel type. Please try again."
+        : decision.denyReason === "dm-disabled"
+          ? "This bot is not accepting direct messages."
+          : decision.denyReason === "channels-disabled"
+            ? "Slash commands are disabled in channels."
+            : decision.denyReason === "channel-no-allowlist"
+              ? "Slash commands are not configured for this channel (no allowlist)."
+              : "Unauthorized.";
+    return {
+      ...decision,
+      denyResponse: {
+        response_type: "ephemeral",
+        text: denyText,
+      },
+    };
+  }
+
+  return {
+    ...decision,
+    denyResponse: undefined,
+  };
+}
+
+/**
+ * Create the HTTP request handler for Mattermost slash command callbacks.
+ *
+ * This handler is registered as a plugin HTTP route and receives POSTs
+ * from the Mattermost server when a user invokes a registered slash command.
+ */
+export function createSlashCommandHttpHandler(params: SlashHttpHandlerParams) {
+  const { account, cfg, runtime, registeredCommands, triggerMap, log, bodyTimeoutMs } = params;
+
+  return async (req: IncomingMessage, res: ServerResponse): Promise<void> => {
+    if (req.method !== "POST") {
+      res.statusCode = 405;
+      res.setHeader("Allow", "POST");
+      res.end("Method Not Allowed");
+      return;
+    }
+
+    let body: string;
+    try {
+      body = await readBody(req, MAX_BODY_BYTES, bodyTimeoutMs);
+    } catch (error) {
+      if (isRequestBodyLimitError(error, "REQUEST_BODY_TIMEOUT")) {
+        res.statusCode = 408;
+        res.end("Request body timeout");
+        return;
+      }
+      res.statusCode = 413;
+      res.end("Payload Too Large");
+      return;
+    }
+
+    const contentType = req.headers["content-type"] ?? "";
+    const payload = parseSlashCommandPayload(body, contentType);
+    if (!payload) {
+      sendJsonResponse(res, 400, {
+        response_type: "ephemeral",
+        text: "Invalid slash command payload.",
+      });
+      return;
+    }
+
+    const registeredCommand = findRegisteredCommandForPayload({ registeredCommands, payload });
+
+    // Fail closed when no commands are registered, the payload doesn't map to
+    // a registered (team, trigger), or the payload token doesn't equal the
+    // resolved command's startup token. Comparing against the resolved
+    // command's token (rather than any token in the account) prevents a token
+    // valid for command A from advancing to upstream validation for command B,
+    // which would otherwise let an attacker poison the per-command failure
+    // cache and DoS legitimate invocations of command B.
+    if (
+      registeredCommands.length === 0 ||
+      !registeredCommand ||
+      !safeEqualSecret(payload.token, registeredCommand.token)
+    ) {
+      sendJsonResponse(res, 401, {
+        response_type: "ephemeral",
+        text: "Unauthorized: invalid command token.",
+      });
+      return;
+    }
+
+    // Extract command info
+    const client = createMattermostClient({
+      baseUrl: account.baseUrl ?? "",
+      botToken: account.botToken ?? "",
+      allowPrivateNetwork: isPrivateNetworkOptInEnabled(account.config),
+    });
+
+    const tokenIsCurrent = await validateMattermostSlashCommandToken({
+      accountId: account.accountId,
+      client,
+      registeredCommand,
+      payload,
+      log,
+    });
+    if (!tokenIsCurrent) {
+      sendJsonResponse(res, 401, {
+        response_type: "ephemeral",
+        text: "Unauthorized: invalid command token.",
+      });
+      return;
+    }
+
+    // Extract command info
+    const trigger = normalizeSlashCommandTrigger(payload.command);
+    const commandText = resolveCommandText(trigger, payload.text, triggerMap);
+    const channelId = payload.channel_id;
+    const senderId = payload.user_id;
+    const senderName = payload.user_name ?? senderId;
+
+    const auth = await authorizeSlashInvocation({
+      account,
+      cfg,
+      client,
+      commandText,
+      channelId,
+      senderId,
+      senderName,
+      log,
+    });
+
+    if (!auth.ok) {
+      sendJsonResponse(
+        res,
+        200,
+        auth.denyResponse ?? { response_type: "ephemeral", text: "Unauthorized." },
+      );
+      return;
+    }
+
+    log?.(
+      `mattermost: slash command /${sanitizeMattermostLogValue(trigger)} from ${sanitizeMattermostLogValue(senderName)} in ${sanitizeMattermostLogValue(channelId)}`,
+    );
+
+    // Acknowledge immediately — we'll send the actual reply asynchronously
+    sendJsonResponse(res, 200, {
+      response_type: "ephemeral",
+      text: "Processing...",
+    });
+
+    // Now handle the command asynchronously (post reply as a message)
+    try {
+      await handleSlashCommandAsync({
+        account,
+        cfg,
+        runtime,
+        client,
+        commandText,
+        channelId,
+        senderId,
+        senderName,
+        teamId: payload.team_id,
+        triggerId: payload.trigger_id,
+        kind: auth.kind,
+        chatType: auth.chatType,
+        channelName: auth.channelName,
+        channelDisplay: auth.channelDisplay,
+        roomLabel: auth.roomLabel,
+        commandAuthorized: auth.commandAuthorized,
+        log,
+      });
+    } catch (err) {
+      log?.(`mattermost: slash command handler error: ${sanitizeCommandLookupError(err)}`);
+      try {
+        const to = `channel:${channelId}`;
+        await sendMessageMattermost(to, "Sorry, something went wrong processing that command.", {
+          cfg,
+          accountId: account.accountId,
+        });
+      } catch {
+        // best-effort error reply
+      }
+    }
+  };
+}
+
+async function handleSlashCommandAsync(params: {
+  account: ResolvedMattermostAccount;
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+  client: ReturnType<typeof createMattermostClient>;
+  commandText: string;
+  channelId: string;
+  senderId: string;
+  senderName: string;
+  teamId: string;
+  kind: "direct" | "group" | "channel";
+  chatType: "direct" | "group" | "channel";
+  channelName: string;
+  channelDisplay: string;
+  roomLabel: string;
+  commandAuthorized: boolean;
+  triggerId?: string;
+  log?: (msg: string) => void;
+}) {
+  const {
+    account,
+    cfg,
+    runtime,
+    client,
+    commandText,
+    channelId,
+    senderId,
+    senderName,
+    teamId,
+    kind,
+    chatType,
+    channelName: _channelName,
+    channelDisplay,
+    roomLabel,
+    commandAuthorized,
+    triggerId,
+    log,
+  } = params;
+  const core = getMattermostRuntime();
+
+  const route = core.channel.routing.resolveAgentRoute({
+    cfg,
+    channel: "mattermost",
+    accountId: account.accountId,
+    teamId,
+    peer: {
+      kind,
+      id: kind === "direct" ? senderId : channelId,
+    },
+  });
+
+  const fromLabel =
+    kind === "direct"
+      ? `Mattermost DM from ${senderName}`
+      : `Mattermost message in ${roomLabel} from ${senderName}`;
+
+  const to = kind === "direct" ? `user:${senderId}` : `channel:${channelId}`;
+  const pickerEntry = resolveMattermostModelPickerEntry(commandText);
+  if (pickerEntry) {
+    const data = await buildModelsProviderData(cfg, route.agentId);
+    if (data.providers.length === 0) {
+      await sendMessageMattermost(to, "No models available.", {
+        cfg,
+        accountId: account.accountId,
+      });
+      return;
+    }
+
+    const currentModel = resolveMattermostModelPickerCurrentModel({
+      cfg,
+      route,
+      data,
+    });
+    const view =
+      pickerEntry.kind === "summary"
+        ? renderMattermostModelSummaryView({
+            ownerUserId: senderId,
+            currentModel,
+          })
+        : pickerEntry.kind === "providers"
+          ? renderMattermostProviderPickerView({
+              ownerUserId: senderId,
+              data,
+              currentModel,
+            })
+          : renderMattermostModelsPickerView({
+              ownerUserId: senderId,
+              data,
+              provider: pickerEntry.provider,
+              page: 1,
+              currentModel,
+            });
+
+    await sendMessageMattermost(to, view.text, {
+      cfg,
+      accountId: account.accountId,
+      buttons: view.buttons,
+    });
+    runtime.log?.(`delivered model picker to ${to}`);
+    return;
+  }
+
+  // Build inbound context — the command text is the body
+  const ctxPayload = core.channel.reply.finalizeInboundContext({
+    Body: commandText,
+    BodyForAgent: commandText,
+    RawBody: commandText,
+    CommandBody: commandText,
+    From:
+      kind === "direct"
+        ? `mattermost:${senderId}`
+        : kind === "group"
+          ? `mattermost:group:${channelId}`
+          : `mattermost:channel:${channelId}`,
+    To: to,
+    SessionKey: route.sessionKey,
+    AccountId: route.accountId,
+    ChatType: chatType,
+    ConversationLabel: fromLabel,
+    GroupSubject: kind !== "direct" ? channelDisplay || roomLabel : undefined,
+    SenderName: senderName,
+    SenderId: senderId,
+    Provider: "mattermost" as const,
+    Surface: "mattermost" as const,
+    MessageSid: triggerId ?? `slash-${Date.now()}`,
+    Timestamp: Date.now(),
+    WasMentioned: true,
+    CommandAuthorized: commandAuthorized,
+    CommandSource: "native" as const,
+    OriginatingChannel: "mattermost" as const,
+    OriginatingTo: to,
+  });
+
+  const textLimit = core.channel.text.resolveTextChunkLimit(cfg, "mattermost", account.accountId, {
+    fallbackLimit: account.textChunkLimit ?? 4000,
+  });
+  const tableMode = core.channel.text.resolveMarkdownTableMode({
+    cfg,
+    channel: "mattermost",
+    accountId: account.accountId,
+  });
+
+  const { onModelSelected, typingCallbacks, ...replyPipeline } = createChannelMessageReplyPipeline({
+    cfg,
+    agentId: route.agentId,
+    channel: "mattermost",
+    accountId: account.accountId,
+    typing: {
+      start: () => sendMattermostTyping(client, { channelId }),
+      onStartError: (err) => {
+        logTypingFailure({
+          log: (message) => log?.(message),
+          channel: "mattermost",
+          target: channelId,
+          error: err,
+        });
+      },
+    },
+  });
+  const humanDelay = core.channel.reply.resolveHumanDelayConfig(cfg, route.agentId);
+  const deliveryBarrier = createMattermostReplyDeliveryBarrier({
+    isDirect: kind === "direct",
+    dmRetryOptions: account.config.dmChannelRetry,
+  });
+
+  const { dispatcher, replyOptions, markDispatchIdle } =
+    core.channel.reply.createReplyDispatcherWithTyping({
+      ...replyPipeline,
+      resolveFollowupAdmissionBarrierTimeoutPolicy: deliveryBarrier.resolveTimeoutPolicy,
+      onDeliverySettled: deliveryBarrier.markDeliverySettled,
+      humanDelay,
+      deliver: async (payload: ReplyPayload) => {
+        await deliverMattermostReplyPayload({
+          core,
+          cfg,
+          payload,
+          to,
+          accountId: account.accountId,
+          agentId: route.agentId,
+          textLimit,
+          tableMode,
+          sendMessage: sendMessageMattermost,
+          onDmChannelResolution: deliveryBarrier.trackDmChannelResolution,
+        });
+        runtime.log?.(`delivered slash reply to ${to}`);
+      },
+      onError: (err, info) => {
+        runtime.error?.(
+          `mattermost slash ${info.kind} reply failed: ${sanitizeCommandLookupError(err)}`,
+        );
+      },
+      onReplyStart: typingCallbacks?.onReplyStart,
+    });
+
+  await core.channel.reply.withReplyDispatcher({
+    dispatcher,
+    onSettled: () => {
+      markDispatchIdle();
+    },
+    run: () =>
+      core.channel.reply.dispatchReplyFromConfig({
+        ctx: ctxPayload,
+        cfg,
+        dispatcher,
+        replyOptions: {
+          ...replyOptions,
+          disableBlockStreaming:
+            typeof account.blockStreaming === "boolean" ? !account.blockStreaming : undefined,
+          onModelSelected,
+        },
+      }),
+  });
+}

extensions/mattermost/src/mattermost/slash-state.test.ts

@@ -0,0 +1,188 @@
+// Mattermost tests cover slash state plugin behavior.
+import { afterEach, describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig, RuntimeEnv } from "../runtime-api.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import type { MattermostRegisteredCommand } from "./slash-commands.js";
+import {
+  activateSlashCommands,
+  deactivateSlashCommands,
+  resolveSlashHandlerForCommand,
+  resolveSlashHandlerForToken,
+} from "./slash-state.js";
+
+function createResolvedMattermostAccount(accountId: string): ResolvedMattermostAccount {
+  return {
+    accountId,
+    enabled: true,
+    botTokenSource: "config",
+    baseUrlSource: "config",
+    streamingMode: "partial",
+    config: {},
+  };
+}
+
+function createRegisteredCommand(params?: {
+  id?: string;
+  teamId?: string;
+  trigger?: string;
+}): MattermostRegisteredCommand {
+  return {
+    id: params?.id ?? "cmd-1",
+    teamId: params?.teamId ?? "team-1",
+    trigger: params?.trigger ?? "oc_status",
+    token: "token-1",
+    url: "https://gateway.example.com/slash",
+    managed: false,
+  };
+}
+
+const slashApi = {
+  cfg: {},
+  runtime: {
+    log: () => {},
+    error: () => {},
+    exit: () => {},
+  },
+} satisfies {
+  cfg: OpenClawConfig;
+  runtime: RuntimeEnv;
+};
+
+const ACCOUNT_STATES_KEY = Symbol.for("openclaw.mattermost.slash-account-states");
+
+describe("slash-state global singleton", () => {
+  afterEach(() => {
+    deactivateSlashCommands();
+  });
+
+  it("anchors accountStates on globalThis", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-a"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    const globalStore = globalThis as Record<PropertyKey, unknown>;
+    const map = globalStore[ACCOUNT_STATES_KEY];
+    expect(map).toBeInstanceOf(Map);
+    expect((map as Map<string, unknown>).has("a1")).toBe(true);
+  });
+
+  it("preserves slash state across module reloads", async () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-reload"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    vi.resetModules();
+    const reloaded = await import("./slash-state.js");
+    const match = reloaded.resolveSlashHandlerForToken("tok-reload");
+
+    expect(match.kind).toBe("single");
+    if (match.kind !== "single") {
+      throw new Error("expected single match after module reload");
+    }
+    expect(match.accountIds).toEqual(["a1"]);
+  });
+});
+
+describe("slash-state token routing", () => {
+  it("returns single match when token belongs to one account", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-a"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForToken("tok-a");
+    expect(match.kind).toBe("single");
+    if (match.kind !== "single") {
+      throw new Error("expected single match");
+    }
+    expect(match.source).toBe("token");
+    expect(match.accountIds).toEqual(["a1"]);
+    expect(typeof match.handler).toBe("function");
+  });
+
+  it("returns ambiguous when same token exists in multiple accounts", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-shared"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a2"),
+      commandTokens: ["tok-shared"],
+      registeredCommands: [],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForToken("tok-shared");
+    expect(match.kind).toBe("ambiguous");
+    if (match.kind !== "ambiguous") {
+      throw new Error("expected ambiguous match");
+    }
+    expect(match.source).toBe("token");
+    expect(match.accountIds.toSorted()).toEqual(["a1", "a2"]);
+  });
+
+  it("routes by registered team and command when token lookup misses", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["old-token"],
+      registeredCommands: [createRegisteredCommand()],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForCommand({
+      teamId: "team-1",
+      command: "/oc_status",
+    });
+
+    expect(match.kind).toBe("single");
+    if (match.kind !== "single") {
+      throw new Error("expected single match");
+    }
+    expect(match.source).toBe("command");
+    expect(match.accountIds).toEqual(["a1"]);
+    expect(typeof match.handler).toBe("function");
+  });
+
+  it("returns ambiguous when registered team and command match multiple accounts", () => {
+    deactivateSlashCommands();
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a1"),
+      commandTokens: ["tok-a"],
+      registeredCommands: [createRegisteredCommand({ id: "cmd-a" })],
+      api: slashApi,
+    });
+    activateSlashCommands({
+      account: createResolvedMattermostAccount("a2"),
+      commandTokens: ["tok-b"],
+      registeredCommands: [createRegisteredCommand({ id: "cmd-b" })],
+      api: slashApi,
+    });
+
+    const match = resolveSlashHandlerForCommand({
+      teamId: "team-1",
+      command: "/oc_status",
+    });
+
+    expect(match.kind).toBe("ambiguous");
+    if (match.kind !== "ambiguous") {
+      throw new Error("expected ambiguous match");
+    }
+    expect(match.source).toBe("command");
+    expect(match.accountIds.toSorted()).toEqual(["a1", "a2"]);
+  });
+});

extensions/mattermost/src/mattermost/slash-state.ts

@@ -0,0 +1,423 @@
+/**
+ * Shared state for Mattermost slash commands.
+ *
+ * Bridges the plugin registration phase (HTTP route) with the monitor phase
+ * (command registration with MM API). The HTTP handler needs to know which
+ * tokens are known for fast-path routing, and the monitor needs to store
+ * registered command IDs.
+ *
+ * State is kept per-account so that multi-account deployments don't
+ * overwrite each other's tokens, registered commands, or handlers.
+ */
+
+import type { IncomingMessage, ServerResponse } from "node:http";
+import { Readable } from "node:stream";
+import type { MattermostConfig } from "../types.js";
+import type { ResolvedMattermostAccount } from "./accounts.js";
+import {
+  isRequestBodyLimitError,
+  readRequestBodyWithLimit,
+  type OpenClawPluginApi,
+} from "./runtime-api.js";
+import {
+  normalizeSlashCommandTrigger,
+  parseSlashCommandPayload,
+  resolveSlashCommandConfig,
+  type MattermostRegisteredCommand,
+} from "./slash-commands.js";
+import {
+  clearMattermostSlashCommandValidationCacheForAccount,
+  createSlashCommandHttpHandler,
+} from "./slash-http.js";
+
+const MULTI_ACCOUNT_BODY_MAX_BYTES = 64 * 1024;
+const MULTI_ACCOUNT_BODY_TIMEOUT_MS = 5_000;
+type SlashHandlerMatchSource = "token" | "command";
+type SlashHandlerMatch =
+  | { kind: "none" }
+  | {
+      kind: "single";
+      source: SlashHandlerMatchSource;
+      handler: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+      accountIds: string[];
+    }
+  | {
+      kind: "ambiguous";
+      source: SlashHandlerMatchSource;
+      accountIds: string[];
+    };
+
+// ─── Per-account state ───────────────────────────────────────────────────────
+
+type SlashCommandAccountState = {
+  /** Tokens from registered/current commands, used for fast-path routing. */
+  commandTokens: Set<string>;
+  /** Registered command IDs for cleanup on shutdown. */
+  registeredCommands: MattermostRegisteredCommand[];
+  /** Current HTTP handler for this account. */
+  handler: ((req: IncomingMessage, res: ServerResponse) => Promise<void>) | null;
+  /** The account that activated slash commands. */
+  account: ResolvedMattermostAccount;
+  /** Map from trigger to original command name (for skill commands that start with oc_). */
+  triggerMap: Map<string, string>;
+};
+
+/**
+ * Map from accountId → per-account slash command state.
+ *
+ * Anchored to globalThis so that jiti-loaded (route registration) and
+ * native-ESM-loaded (monitor/activation) module instances share the
+ * same Map. Without this, each module loader creates its own copy of
+ * the module-level variable and the HTTP handler never sees the tokens
+ * populated by the monitor.
+ */
+const ACCOUNT_STATES_KEY = Symbol.for("openclaw.mattermost.slash-account-states");
+
+function getSlashAccountStates(): Map<string, SlashCommandAccountState> {
+  const globalStore = globalThis as Record<PropertyKey, unknown>;
+  const existing = globalStore[ACCOUNT_STATES_KEY];
+  if (existing instanceof Map) {
+    return existing as Map<string, SlashCommandAccountState>;
+  }
+  const accountStates = new Map<string, SlashCommandAccountState>();
+  globalStore[ACCOUNT_STATES_KEY] = accountStates;
+  return accountStates;
+}
+
+const accountStates = getSlashAccountStates();
+
+export function resolveSlashHandlerForToken(token: string): SlashHandlerMatch {
+  const matches: Array<{
+    accountId: string;
+    handler: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+  }> = [];
+
+  for (const [accountId, state] of accountStates) {
+    if (state.commandTokens.has(token) && state.handler) {
+      matches.push({ accountId, handler: state.handler });
+    }
+  }
+
+  if (matches.length === 0) {
+    return { kind: "none" };
+  }
+  if (matches.length === 1) {
+    return {
+      kind: "single",
+      source: "token",
+      handler: matches[0].handler,
+      accountIds: [matches[0].accountId],
+    };
+  }
+
+  return {
+    kind: "ambiguous",
+    source: "token",
+    accountIds: matches.map((entry) => entry.accountId),
+  };
+}
+
+export function resolveSlashHandlerForCommand(params: {
+  teamId: string;
+  command: string;
+}): SlashHandlerMatch {
+  const trigger = normalizeSlashCommandTrigger(params.command);
+  if (!trigger) {
+    return { kind: "none" };
+  }
+
+  const matches: Array<{
+    accountId: string;
+    handler: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+  }> = [];
+
+  for (const [accountId, state] of accountStates) {
+    if (
+      state.handler &&
+      state.registeredCommands.some(
+        (cmd) => cmd.teamId === params.teamId && cmd.trigger === trigger,
+      )
+    ) {
+      matches.push({ accountId, handler: state.handler });
+    }
+  }
+
+  if (matches.length === 0) {
+    return { kind: "none" };
+  }
+  if (matches.length === 1) {
+    return {
+      kind: "single",
+      source: "command",
+      handler: matches[0].handler,
+      accountIds: [matches[0].accountId],
+    };
+  }
+
+  return {
+    kind: "ambiguous",
+    source: "command",
+    accountIds: matches.map((entry) => entry.accountId),
+  };
+}
+
+/**
+ * Get the slash command state for a specific account, or null if not activated.
+ */
+export function getSlashCommandState(accountId: string): SlashCommandAccountState | null {
+  return accountStates.get(accountId) ?? null;
+}
+
+/**
+ * Activate slash commands for a specific account.
+ * Called from the monitor after bot connects.
+ */
+export function activateSlashCommands(params: {
+  account: ResolvedMattermostAccount;
+  commandTokens: string[];
+  registeredCommands: MattermostRegisteredCommand[];
+  triggerMap?: Map<string, string>;
+  api: {
+    cfg: import("./runtime-api.js").OpenClawConfig;
+    runtime: import("./runtime-api.js").RuntimeEnv;
+  };
+  log?: (msg: string) => void;
+}) {
+  const { account, commandTokens, registeredCommands, triggerMap, api, log } = params;
+  const accountId = account.accountId;
+
+  const tokenSet = new Set(commandTokens);
+
+  const handler = createSlashCommandHttpHandler({
+    account,
+    cfg: api.cfg,
+    runtime: api.runtime,
+    registeredCommands,
+    triggerMap,
+    log,
+  });
+
+  accountStates.set(accountId, {
+    commandTokens: tokenSet,
+    registeredCommands,
+    handler,
+    account,
+    triggerMap: triggerMap ?? new Map(),
+  });
+
+  log?.(
+    `mattermost: slash commands activated for account ${accountId} (${registeredCommands.length} commands)`,
+  );
+}
+
+/**
+ * Deactivate slash commands for a specific account (on shutdown/disconnect).
+ */
+export function deactivateSlashCommands(accountId?: string) {
+  if (accountId) {
+    const state = accountStates.get(accountId);
+    if (state) {
+      state.commandTokens.clear();
+      state.registeredCommands = [];
+      state.handler = null;
+      clearMattermostSlashCommandValidationCacheForAccount(accountId);
+      accountStates.delete(accountId);
+    }
+  } else {
+    // Deactivate all accounts (full shutdown)
+    for (const [stateAccountId, state] of accountStates) {
+      state.commandTokens.clear();
+      state.registeredCommands = [];
+      state.handler = null;
+      clearMattermostSlashCommandValidationCacheForAccount(stateAccountId);
+    }
+    accountStates.clear();
+  }
+}
+
+/**
+ * Register the HTTP route for slash command callbacks.
+ * Called during plugin registration.
+ *
+ * The single HTTP route dispatches to the correct per-account handler by
+ * matching the inbound token against each account's known tokens, falling back
+ * to registered team/trigger ownership so upstream validation can accept a
+ * rotated Mattermost token.
+ */
+export function registerSlashCommandRoute(api: OpenClawPluginApi) {
+  const mmConfig = api.config.channels?.mattermost as MattermostConfig | undefined;
+
+  // Collect callback paths from both top-level and per-account config.
+  // Command registration uses account.config.commands, so the HTTP route
+  // registration must include any account-specific callbackPath overrides.
+  // Also extract the pathname from an explicit callbackUrl when it differs
+  // from callbackPath, so that Mattermost callbacks hit a registered route.
+  const callbackPaths = new Set<string>();
+
+  const addCallbackPaths = (
+    raw: Partial<import("./slash-commands.js").MattermostSlashCommandConfig> | undefined,
+  ) => {
+    const resolved = resolveSlashCommandConfig(raw);
+    callbackPaths.add(resolved.callbackPath);
+    if (resolved.callbackUrl) {
+      try {
+        const urlPath = new URL(resolved.callbackUrl).pathname;
+        if (urlPath && urlPath !== resolved.callbackPath) {
+          callbackPaths.add(urlPath);
+        }
+      } catch {
+        // Invalid URL — ignore, will be caught during registration
+      }
+    }
+  };
+
+  const commandsRaw = mmConfig?.commands as
+    | Partial<import("./slash-commands.js").MattermostSlashCommandConfig>
+    | undefined;
+  addCallbackPaths(commandsRaw);
+
+  const accountsRaw = mmConfig?.accounts ?? {};
+  for (const accountId of Object.keys(accountsRaw)) {
+    const accountCommandsRaw = accountsRaw[accountId]?.commands;
+    addCallbackPaths(accountCommandsRaw);
+  }
+
+  const routeHandler = async (req: IncomingMessage, res: ServerResponse) => {
+    if (accountStates.size === 0) {
+      res.statusCode = 503;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: "Slash commands are not yet initialized. Please try again in a moment.",
+        }),
+      );
+      return;
+    }
+
+    // We need to peek at the body to route to the right account handler. Each
+    // account handler still performs upstream token validation before running a
+    // command.
+
+    // If there's only one active account (common case), route directly.
+    if (accountStates.size === 1) {
+      const [, state] = [...accountStates.entries()][0];
+      if (!state.handler) {
+        res.statusCode = 503;
+        res.setHeader("Content-Type", "application/json; charset=utf-8");
+        res.end(
+          JSON.stringify({
+            response_type: "ephemeral",
+            text: "Slash commands are not yet initialized. Please try again in a moment.",
+          }),
+        );
+        return;
+      }
+      await state.handler(req, res);
+      return;
+    }
+
+    // Multi-account: buffer the body, find the matching account by token or
+    // registered team/trigger, then replay the request to the correct handler.
+    // Use the bounded helper so a slow/never-finishing client cannot tie up the
+    // routing handler indefinitely (Slowloris).
+    let bodyStr: string;
+    try {
+      bodyStr = await readRequestBodyWithLimit(req, {
+        maxBytes: MULTI_ACCOUNT_BODY_MAX_BYTES,
+        timeoutMs: MULTI_ACCOUNT_BODY_TIMEOUT_MS,
+      });
+    } catch (error) {
+      if (isRequestBodyLimitError(error, "REQUEST_BODY_TIMEOUT")) {
+        res.statusCode = 408;
+        res.end("Request body timeout");
+        return;
+      }
+      res.statusCode = 413;
+      res.end("Payload Too Large");
+      return;
+    }
+
+    // Parse the token for the fast path; if it misses, parse the full slash
+    // payload so rotated tokens can still route by registered team/trigger.
+    let token: string | null = null;
+    const ct = req.headers["content-type"] ?? "";
+    try {
+      if (ct.includes("application/json")) {
+        token = (JSON.parse(bodyStr) as { token?: string }).token ?? null;
+      } else {
+        token = new URLSearchParams(bodyStr).get("token");
+      }
+    } catch {
+      // parse failed — will be caught by handler
+    }
+
+    let match: SlashHandlerMatch = token ? resolveSlashHandlerForToken(token) : { kind: "none" };
+    if (match.kind === "none") {
+      const payload = parseSlashCommandPayload(bodyStr, ct);
+      if (payload) {
+        match = resolveSlashHandlerForCommand({
+          teamId: payload.team_id,
+          command: payload.command,
+        });
+      }
+    }
+
+    if (match.kind === "none") {
+      // No matching account — reject
+      res.statusCode = 401;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: "Unauthorized: invalid command token.",
+        }),
+      );
+      return;
+    }
+
+    if (match.kind === "ambiguous") {
+      api.logger.warn?.(
+        `mattermost: slash callback matched multiple accounts via ${match.source} (${match.accountIds.join(", ")})`,
+      );
+      const conflictText =
+        match.source === "token"
+          ? "Conflict: command token is not unique across accounts."
+          : "Conflict: slash command is not unique across accounts.";
+      res.statusCode = 409;
+      res.setHeader("Content-Type", "application/json; charset=utf-8");
+      res.end(
+        JSON.stringify({
+          response_type: "ephemeral",
+          text: conflictText,
+        }),
+      );
+      return;
+    }
+
+    const matchedHandler = match.handler;
+
+    // Replay: create a synthetic readable that re-emits the buffered body
+    const syntheticReq = new Readable({
+      read() {
+        this.push(Buffer.from(bodyStr, "utf8"));
+        this.push(null);
+      },
+    }) as IncomingMessage;
+
+    // Copy necessary IncomingMessage properties
+    syntheticReq.method = req.method;
+    syntheticReq.url = req.url;
+    syntheticReq.headers = req.headers;
+
+    await matchedHandler(syntheticReq, res);
+  };
+
+  for (const callbackPath of callbackPaths) {
+    api.registerHttpRoute({
+      path: callbackPath,
+      auth: "plugin",
+      handler: routeHandler,
+    });
+  }
+}

extensions/mattermost/src/mattermost/target-resolution.test.ts

@@ -0,0 +1,129 @@
+// Mattermost tests cover target resolution plugin behavior.
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+const resolveMattermostAccount = vi.fn();
+const createMattermostClient = vi.fn();
+const fetchMattermostUser = vi.fn();
+const normalizeMattermostBaseUrl = vi.fn((value: string | undefined) => value?.trim());
+
+vi.mock("./accounts.js", () => ({
+  resolveMattermostAccount,
+}));
+
+vi.mock("./client.js", () => ({
+  createMattermostClient,
+  fetchMattermostUser,
+  normalizeMattermostBaseUrl,
+}));
+
+describe("mattermost target resolution", () => {
+  let isExplicitMattermostTarget: typeof import("./target-resolution.js").isExplicitMattermostTarget;
+  let isMattermostId: typeof import("./target-resolution.js").isMattermostId;
+  let parseMattermostApiStatus: typeof import("./target-resolution.js").parseMattermostApiStatus;
+  let resolveMattermostOpaqueTarget: typeof import("./target-resolution.js").resolveMattermostOpaqueTarget;
+  let resetMattermostOpaqueTargetCacheForTests: typeof import("./target-resolution.js").resetMattermostOpaqueTargetCacheForTests;
+
+  beforeAll(async () => {
+    ({
+      isExplicitMattermostTarget,
+      isMattermostId,
+      parseMattermostApiStatus,
+      resolveMattermostOpaqueTarget,
+      resetMattermostOpaqueTargetCacheForTests,
+    } = await import("./target-resolution.js"));
+  });
+
+  beforeEach(() => {
+    resolveMattermostAccount.mockReset();
+    createMattermostClient.mockReset();
+    fetchMattermostUser.mockReset();
+    normalizeMattermostBaseUrl.mockClear();
+  });
+
+  afterEach(() => {
+    resetMattermostOpaqueTargetCacheForTests();
+  });
+
+  it("recognizes explicit targets and ID-shaped values", () => {
+    expect(isExplicitMattermostTarget("@alice")).toBe(true);
+    expect(isExplicitMattermostTarget("#town-square")).toBe(true);
+    expect(isExplicitMattermostTarget("mattermost:chan")).toBe(true);
+    expect(isExplicitMattermostTarget(" plain ")).toBe(false);
+    expect(isMattermostId("abcd1234abcd1234abcd1234ab")).toBe(true);
+    expect(isMattermostId("short")).toBe(false);
+    expect(parseMattermostApiStatus(new Error("Mattermost API 404 Not Found"))).toBe(404);
+    expect(parseMattermostApiStatus(new Error("other error"))).toBeUndefined();
+  });
+
+  it("resolves opaque ids as users and caches the result", async () => {
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockResolvedValue({ id: "abcd1234abcd1234abcd1234ab" });
+    const input = "abcd1234abcd1234abcd1234ab";
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "user",
+      id: input,
+      to: `user:${input}`,
+    });
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "user",
+      id: input,
+      to: `user:${input}`,
+    });
+
+    expect(createMattermostClient).toHaveBeenCalledTimes(1);
+    expect(fetchMattermostUser).toHaveBeenCalledTimes(1);
+  });
+
+  it("falls back to channel targets on 404 lookups", async () => {
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockRejectedValue(new Error("Mattermost API 404 Not Found"));
+    const input = "bcde1234abcd1234abcd1234ab";
+
+    await expect(
+      resolveMattermostOpaqueTarget({
+        input,
+        token: "token",
+        baseUrl: "https://mm.example.com",
+      }),
+    ).resolves.toEqual({
+      kind: "channel",
+      id: input,
+      to: `channel:${input}`,
+    });
+  });
+
+  it("uses account resolution when token/base url are not passed", async () => {
+    resolveMattermostAccount.mockReturnValue({
+      baseUrl: "https://mm.example.com",
+      botToken: "token",
+    });
+    createMattermostClient.mockReturnValue({ client: true });
+    fetchMattermostUser.mockResolvedValue({ id: "cdef1234abcd1234abcd1234ab" });
+    const input = "cdef1234abcd1234abcd1234ab";
+
+    await resolveMattermostOpaqueTarget({
+      input,
+      cfg: { channels: { mattermost: {} } },
+      accountId: "acct-1",
+    });
+
+    expect(resolveMattermostAccount).toHaveBeenCalledWith({
+      cfg: { channels: { mattermost: {} } },
+      accountId: "acct-1",
+    });
+  });
+});

extensions/mattermost/src/mattermost/target-resolution.ts

@@ -0,0 +1,104 @@
+// Mattermost plugin module implements target resolution behavior.
+import { isPrivateNetworkOptInEnabled } from "openclaw/plugin-sdk/ssrf-runtime";
+import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
+import { resolveMattermostAccount } from "./accounts.js";
+import {
+  createMattermostClient,
+  fetchMattermostUser,
+  normalizeMattermostBaseUrl,
+} from "./client.js";
+import type { OpenClawConfig } from "./runtime-api.js";
+
+export type MattermostOpaqueTargetResolution = {
+  kind: "user" | "channel";
+  id: string;
+  to: string;
+};
+
+const mattermostOpaqueTargetCache = new Map<string, boolean>();
+
+function cacheKey(baseUrl: string, token: string, id: string): string {
+  return `${baseUrl}::${token}::${id}`;
+}
+
+/** Mattermost IDs are 26-character lowercase alphanumeric strings. */
+export function isMattermostId(value: string): boolean {
+  return /^[a-z0-9]{26}$/.test(value);
+}
+
+export function isExplicitMattermostTarget(raw: string): boolean {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return false;
+  }
+  return (
+    /^(channel|user|mattermost):/i.test(trimmed) ||
+    trimmed.startsWith("@") ||
+    trimmed.startsWith("#")
+  );
+}
+
+export function parseMattermostApiStatus(err: unknown): number | undefined {
+  if (!err || typeof err !== "object") {
+    return undefined;
+  }
+  const msg = "message" in err && typeof err.message === "string" ? err.message : "";
+  const match = /Mattermost API (\d{3})\b/.exec(msg);
+  if (!match) {
+    return undefined;
+  }
+  const code = Number(match[1]);
+  return Number.isFinite(code) ? code : undefined;
+}
+
+export async function resolveMattermostOpaqueTarget(params: {
+  input: string;
+  cfg?: OpenClawConfig;
+  accountId?: string | null;
+  token?: string;
+  baseUrl?: string;
+}): Promise<MattermostOpaqueTargetResolution | null> {
+  const input = params.input.trim();
+  if (!input || isExplicitMattermostTarget(input) || !isMattermostId(input)) {
+    return null;
+  }
+
+  const account =
+    params.cfg && (!params.token || !params.baseUrl)
+      ? resolveMattermostAccount({ cfg: params.cfg, accountId: params.accountId })
+      : null;
+  const token = normalizeOptionalString(params.token) ?? normalizeOptionalString(account?.botToken);
+  const baseUrl = normalizeMattermostBaseUrl(params.baseUrl ?? account?.baseUrl);
+  if (!token || !baseUrl) {
+    return null;
+  }
+
+  const key = cacheKey(baseUrl, token, input);
+  const cached = mattermostOpaqueTargetCache.get(key);
+  if (cached === true) {
+    return { kind: "user", id: input, to: `user:${input}` };
+  }
+  if (cached === false) {
+    return { kind: "channel", id: input, to: `channel:${input}` };
+  }
+
+  const client = createMattermostClient({
+    baseUrl,
+    botToken: token,
+    allowPrivateNetwork: isPrivateNetworkOptInEnabled(account?.config),
+  });
+  try {
+    await fetchMattermostUser(client, input);
+    mattermostOpaqueTargetCache.set(key, true);
+    return { kind: "user", id: input, to: `user:${input}` };
+  } catch (err) {
+    if (parseMattermostApiStatus(err) === 404) {
+      mattermostOpaqueTargetCache.set(key, false);
+    }
+    return { kind: "channel", id: input, to: `channel:${input}` };
+  }
+}
+
+export function resetMattermostOpaqueTargetCacheForTests(): void {
+  mattermostOpaqueTargetCache.clear();
+}

extensions/mattermost/src/mattermost/thread-participation.test.ts

@@ -0,0 +1,115 @@
+// Mattermost tests cover thread participation cache plugin behavior.
+import type { OpenKeyedStoreOptions } from "openclaw/plugin-sdk/plugin-state-runtime";
+import {
+  createPluginStateKeyedStoreForTests,
+  resetPluginStateStoreForTests,
+} from "openclaw/plugin-sdk/plugin-state-test-runtime";
+import type { PluginRuntime } from "openclaw/plugin-sdk/runtime-store";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { setMattermostRuntime } from "../runtime.js";
+import {
+  clearMattermostThreadParticipationCache,
+  hasMattermostThreadParticipationWithPersistence,
+  recordMattermostThreadParticipation,
+} from "./thread-participation.js";
+
+// Drain microtasks + the immediate queue so the fire-and-forget persistent write
+// in recordMattermostThreadParticipation has settled before we assert on it.
+const flush = (): Promise<void> =>
+  new Promise((resolve) => {
+    setImmediate(resolve);
+  });
+
+function setRuntime(openKeyedStore: (options: OpenKeyedStoreOptions) => unknown): void {
+  setMattermostRuntime({
+    state: { openKeyedStore },
+    logging: { getChildLogger: () => ({ warn() {} }) },
+  } as unknown as PluginRuntime);
+}
+
+function setPersistentRuntime(): void {
+  setRuntime((options) => createPluginStateKeyedStoreForTests("mattermost", options));
+}
+
+describe("mattermost thread participation", () => {
+  beforeEach(() => {
+    resetPluginStateStoreForTests();
+    clearMattermostThreadParticipationCache();
+    setPersistentRuntime();
+  });
+
+  afterEach(() => {
+    clearMattermostThreadParticipationCache();
+    resetPluginStateStoreForTests();
+  });
+
+  it("remembers a thread the bot replied in", async () => {
+    recordMattermostThreadParticipation("acct", "chan", "root-1");
+    await expect(
+      hasMattermostThreadParticipationWithPersistence({
+        accountId: "acct",
+        channelId: "chan",
+        threadRootId: "root-1",
+      }),
+    ).resolves.toBe(true);
+  });
+
+  it("isolates participation by account, channel, and thread", async () => {
+    recordMattermostThreadParticipation("acct", "chan", "root-1");
+    await flush();
+    for (const probe of [
+      { accountId: "other", channelId: "chan", threadRootId: "root-1" },
+      { accountId: "acct", channelId: "other", threadRootId: "root-1" },
+      { accountId: "acct", channelId: "chan", threadRootId: "root-2" },
+    ]) {
+      await expect(hasMattermostThreadParticipationWithPersistence(probe)).resolves.toBe(false);
+    }
+  });
+
+  it("ignores empty identifiers", async () => {
+    recordMattermostThreadParticipation("", "chan", "root-1");
+    await expect(
+      hasMattermostThreadParticipationWithPersistence({
+        accountId: "",
+        channelId: "chan",
+        threadRootId: "root-1",
+      }),
+    ).resolves.toBe(false);
+  });
+
+  it("recovers participation from the persistent store after the in-memory cache is lost", async () => {
+    recordMattermostThreadParticipation("acct", "chan", "root-1");
+    await flush();
+    // Simulate a restart: in-memory cache cleared, persistent SQLite store intact.
+    clearMattermostThreadParticipationCache();
+    await expect(
+      hasMattermostThreadParticipationWithPersistence({
+        accountId: "acct",
+        channelId: "chan",
+        threadRootId: "root-1",
+      }),
+    ).resolves.toBe(true);
+  });
+
+  it("degrades to in-memory only when the persistent store fails", async () => {
+    setRuntime(() => {
+      throw new Error("sqlite unavailable");
+    });
+    // record + read must not throw; the in-memory cache still answers.
+    recordMattermostThreadParticipation("acct", "chan", "root-1");
+    await expect(
+      hasMattermostThreadParticipationWithPersistence({
+        accountId: "acct",
+        channelId: "chan",
+        threadRootId: "root-1",
+      }),
+    ).resolves.toBe(true);
+    await expect(
+      hasMattermostThreadParticipationWithPersistence({
+        accountId: "acct",
+        channelId: "chan",
+        threadRootId: "missing",
+      }),
+    ).resolves.toBe(false);
+  });
+});

extensions/mattermost/src/mattermost/thread-participation.ts

@@ -0,0 +1,82 @@
+// Mattermost plugin module implements thread participation cache behavior.
+import { createPersistentDedupeCache } from "openclaw/plugin-sdk/dedupe-runtime";
+import { getOptionalMattermostRuntime } from "../runtime.js";
+
+/**
+ * Cache of Mattermost threads the bot has replied in. Lets the bot auto-respond
+ * to thread follow-ups without a re-mention after its first visible reply.
+ */
+
+const TTL_MS = 7 * 24 * 60 * 60 * 1000; // 7 days
+const MAX_ENTRIES = 5000;
+const PERSISTENT_MAX_ENTRIES = 1000;
+const PERSISTENT_NAMESPACE = "mattermost.thread-participation";
+
+type MattermostThreadParticipationRecord = {
+  agentId?: string;
+  repliedAt: number;
+};
+
+/**
+ * Keep thread participation shared across bundled chunks so thread auto-reply
+ * gating does not diverge between the inbound-gate and reply-dispatch paths.
+ */
+const MATTERMOST_THREAD_PARTICIPATION_KEY = Symbol.for("openclaw.mattermostThreadParticipation");
+const threadParticipation = createPersistentDedupeCache<MattermostThreadParticipationRecord>({
+  globalKey: MATTERMOST_THREAD_PARTICIPATION_KEY,
+  ttlMs: TTL_MS,
+  maxSize: MAX_ENTRIES,
+  persistent: {
+    namespace: PERSISTENT_NAMESPACE,
+    maxEntries: PERSISTENT_MAX_ENTRIES,
+    openStore: (options) => getOptionalMattermostRuntime()?.state.openKeyedStore(options),
+    logError: (error) => {
+      try {
+        getOptionalMattermostRuntime()
+          ?.logging.getChildLogger({ plugin: "mattermost", feature: "thread-participation-state" })
+          .warn("Mattermost persistent thread participation state failed", {
+            error: String(error),
+          });
+      } catch {
+        // Best effort only: persistent state must never break Mattermost message handling.
+      }
+    },
+  },
+});
+
+function makeKey(accountId: string, channelId: string, threadRootId: string): string {
+  return `${accountId}:${channelId}:${threadRootId}`;
+}
+
+export function recordMattermostThreadParticipation(
+  accountId: string,
+  channelId: string,
+  threadRootId: string,
+  opts?: { agentId?: string },
+): void {
+  if (!accountId || !channelId || !threadRootId) {
+    return;
+  }
+  void threadParticipation.register(makeKey(accountId, channelId, threadRootId), {
+    // Stored for future per-agent thread routing; current reads only need presence.
+    ...(opts?.agentId ? { agentId: opts.agentId } : {}),
+    repliedAt: Date.now(),
+  });
+}
+
+export async function hasMattermostThreadParticipationWithPersistence(params: {
+  accountId: string;
+  channelId: string;
+  threadRootId: string;
+}): Promise<boolean> {
+  if (!params.accountId || !params.channelId || !params.threadRootId) {
+    return false;
+  }
+  return await threadParticipation.lookup(
+    makeKey(params.accountId, params.channelId, params.threadRootId),
+  );
+}
+
+export function clearMattermostThreadParticipationCache(): void {
+  threadParticipation.clearForTest();
+}

extensions/mattermost/src/normalize.test.ts

@@ -0,0 +1,97 @@
+// Mattermost tests cover normalize plugin behavior.
+import { describe, expect, it } from "vitest";
+import { looksLikeMattermostTargetId, normalizeMattermostMessagingTarget } from "./normalize.js";
+
+describe("normalizeMattermostMessagingTarget", () => {
+  it("returns undefined for empty input", () => {
+    expect(normalizeMattermostMessagingTarget("")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("  ")).toBeUndefined();
+  });
+
+  it("normalizes channel: prefix", () => {
+    expect(normalizeMattermostMessagingTarget("channel:abc123")).toBe("channel:abc123");
+    expect(normalizeMattermostMessagingTarget("Channel:ABC")).toBe("channel:ABC");
+  });
+
+  it("normalizes group: prefix to channel:", () => {
+    expect(normalizeMattermostMessagingTarget("group:abc123")).toBe("channel:abc123");
+  });
+
+  it("normalizes user: prefix", () => {
+    expect(normalizeMattermostMessagingTarget("user:abc123")).toBe("user:abc123");
+  });
+
+  it("normalizes mattermost: prefix to user:", () => {
+    expect(normalizeMattermostMessagingTarget("mattermost:abc123")).toBe("user:abc123");
+  });
+
+  it("keeps @username targets", () => {
+    expect(normalizeMattermostMessagingTarget("@alice")).toBe("@alice");
+    expect(normalizeMattermostMessagingTarget("@Alice")).toBe("@Alice");
+  });
+
+  it("returns undefined for #channel (triggers directory lookup)", () => {
+    expect(normalizeMattermostMessagingTarget("#bookmarks")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("#off-topic")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("# ")).toBeUndefined();
+  });
+
+  it("returns undefined for bare names (triggers directory lookup)", () => {
+    expect(normalizeMattermostMessagingTarget("bookmarks")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("off-topic")).toBeUndefined();
+  });
+
+  it("returns undefined for empty prefixed values", () => {
+    expect(normalizeMattermostMessagingTarget("channel:")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("user:")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("@")).toBeUndefined();
+    expect(normalizeMattermostMessagingTarget("#")).toBeUndefined();
+  });
+});
+
+describe("looksLikeMattermostTargetId", () => {
+  it("returns false for empty input", () => {
+    expect(looksLikeMattermostTargetId("")).toBe(false);
+    expect(looksLikeMattermostTargetId("  ")).toBe(false);
+  });
+
+  it("recognizes prefixed targets", () => {
+    expect(looksLikeMattermostTargetId("channel:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("Channel:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("user:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("group:abc")).toBe(true);
+    expect(looksLikeMattermostTargetId("mattermost:abc")).toBe(true);
+  });
+
+  it("recognizes @username", () => {
+    expect(looksLikeMattermostTargetId("@alice")).toBe(true);
+  });
+
+  it("does NOT recognize #channel (should go to directory)", () => {
+    expect(looksLikeMattermostTargetId("#bookmarks")).toBe(false);
+    expect(looksLikeMattermostTargetId("#off-topic")).toBe(false);
+  });
+
+  it("recognizes 26-char alphanumeric Mattermost IDs", () => {
+    expect(looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz")).toBe(true);
+    expect(looksLikeMattermostTargetId("12345678901234567890123456")).toBe(true);
+    expect(looksLikeMattermostTargetId("AbCdEf1234567890abcdef1234")).toBe(true); // pragma: allowlist secret
+  });
+
+  it("recognizes DM channel format (26__26)", () => {
+    expect(
+      looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz__12345678901234567890123456"), // pragma: allowlist secret
+    ).toBe(true);
+  });
+
+  it("rejects short strings that are not Mattermost IDs", () => {
+    expect(looksLikeMattermostTargetId("password")).toBe(false);
+    expect(looksLikeMattermostTargetId("hi")).toBe(false);
+    expect(looksLikeMattermostTargetId("bookmarks")).toBe(false);
+    expect(looksLikeMattermostTargetId("off-topic")).toBe(false);
+  });
+
+  it("rejects strings longer than 26 chars that are not DM format", () => {
+    expect(looksLikeMattermostTargetId("abcdefghijklmnopqrstuvwxyz1")).toBe(false); // pragma: allowlist secret
+  });
+});

extensions/mattermost/src/normalize.ts

@@ -0,0 +1,53 @@
+// Mattermost helper module supports normalize behavior.
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
+
+export function normalizeMattermostMessagingTarget(raw: string): string | undefined {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  const lower = normalizeLowercaseStringOrEmpty(trimmed);
+  if (lower.startsWith("channel:")) {
+    const id = trimmed.slice("channel:".length).trim();
+    return id ? `channel:${id}` : undefined;
+  }
+  if (lower.startsWith("group:")) {
+    const id = trimmed.slice("group:".length).trim();
+    return id ? `channel:${id}` : undefined;
+  }
+  if (lower.startsWith("user:")) {
+    const id = trimmed.slice("user:".length).trim();
+    return id ? `user:${id}` : undefined;
+  }
+  if (lower.startsWith("mattermost:")) {
+    const id = trimmed.slice("mattermost:".length).trim();
+    return id ? `user:${id}` : undefined;
+  }
+  if (trimmed.startsWith("@")) {
+    const id = trimmed.slice(1).trim();
+    return id ? `@${id}` : undefined;
+  }
+  if (trimmed.startsWith("#")) {
+    // Strip # prefix and fall through to directory lookup (same as bare names).
+    // The core's resolveMessagingTarget will use the directory adapter to
+    // resolve the channel name to its Mattermost ID.
+    return undefined;
+  }
+  // Bare name without prefix — return undefined to allow directory lookup
+  return undefined;
+}
+
+export function looksLikeMattermostTargetId(raw: string, _normalized?: string): boolean {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    return false;
+  }
+  if (/^(user|channel|group|mattermost):/i.test(trimmed)) {
+    return true;
+  }
+  if (trimmed.startsWith("@")) {
+    return true;
+  }
+  // Mattermost IDs: 26-char alnum, or DM channels like "abc123__xyz789" (53 chars)
+  return /^[a-z0-9]{26}$/i.test(trimmed) || /^[a-z0-9]{26}__[a-z0-9]{26}$/i.test(trimmed);
+}

extensions/mattermost/src/runtime-api.ts

@@ -0,0 +1,66 @@
+// Legacy map-helper exports in this facade stay for older plugin consumers.
+// New message-turn code should use createChannelHistoryWindow.
+export {
+  applyAccountNameToChannelSection,
+  applySetupAccountConfigPatch,
+  type BaseProbeResult,
+  type BlockStreamingCoalesceConfig,
+  buildAgentMediaPayload,
+  buildChannelConfigSchema,
+  buildComputedAccountStatusSnapshot,
+  buildModelsProviderData,
+  buildPendingHistoryContextFromMap,
+  type ChannelAccountSnapshot,
+  type ChannelDirectoryEntry,
+  type ChannelGroupContext,
+  type ChannelMessageActionName,
+  type ChannelPlugin,
+  type ChatType,
+  chunkTextForOutbound,
+  clearHistoryEntriesIfEnabled,
+  createChannelHistoryWindow,
+  createAccountStatusSink,
+  createChannelPairingController,
+  createChannelMessageReplyPipeline,
+  createDedupeCache,
+  DEFAULT_ACCOUNT_ID,
+  DEFAULT_GROUP_HISTORY_LIMIT,
+  type DmPolicy,
+  formatInboundFromLabel,
+  getAgentScopedMediaLocalRoots,
+  GROUP_POLICY_BLOCKED_LABEL,
+  type GroupPolicy,
+  type HistoryEntry,
+  isDangerousNameMatchingEnabled,
+  isRequestBodyLimitError,
+  isTrustedProxyAddress,
+  listSkillCommandsForAgents,
+  loadOutboundMediaFromUrl,
+  logInboundDrop,
+  logTypingFailure,
+  migrateBaseNameToDefaultAccount,
+  type ModelsProviderData,
+  normalizeAccountId,
+  normalizeProviderId,
+  type OpenClawConfig,
+  type OpenClawPluginApi,
+  parseStrictPositiveInteger,
+  type PluginRuntime,
+  rawDataToString,
+  readRequestBodyWithLimit,
+  recordPendingHistoryEntryIfEnabled,
+  registerPluginHttpRoute,
+  type ReplyPayload,
+  resolveAllowlistMatchSimple,
+  resolveAllowlistProviderRuntimeGroupPolicy,
+  resolveChannelMediaMaxBytes,
+  resolveClientIp,
+  resolveControlCommandGate,
+  resolveDefaultGroupPolicy,
+  resolveStoredModelOverride,
+  resolveStorePath,
+  resolveThreadSessionKeys,
+  type RuntimeEnv,
+  setMattermostRuntime,
+  warnMissingProviderGroupPolicyFallbackOnce,
+} from "../runtime-api.js";

extensions/mattermost/src/runtime.ts

@@ -0,0 +1,13 @@
+// Mattermost plugin module implements runtime behavior.
+import { createPluginRuntimeStore } from "openclaw/plugin-sdk/runtime-store";
+import type { PluginRuntime } from "openclaw/plugin-sdk/runtime-store";
+
+const {
+  setRuntime: setMattermostRuntime,
+  getRuntime: getMattermostRuntime,
+  tryGetRuntime: getOptionalMattermostRuntime,
+} = createPluginRuntimeStore<PluginRuntime>({
+  pluginId: "mattermost",
+  errorMessage: "Mattermost runtime not initialized",
+});
+export { getMattermostRuntime, getOptionalMattermostRuntime, setMattermostRuntime };

extensions/mattermost/src/secret-contract.ts

@@ -0,0 +1,60 @@
+// Mattermost plugin module implements secret contract behavior.
+import {
+  collectSimpleChannelFieldAssignments,
+  getChannelSurface,
+  type ResolverContext,
+  type SecretDefaults,
+  type SecretTargetRegistryEntry,
+} from "openclaw/plugin-sdk/channel-secret-basic-runtime";
+
+export const secretTargetRegistryEntries: SecretTargetRegistryEntry[] = [
+  {
+    id: "channels.mattermost.accounts.*.botToken",
+    targetType: "channels.mattermost.accounts.*.botToken",
+    configFile: "openclaw.json",
+    pathPattern: "channels.mattermost.accounts.*.botToken",
+    secretShape: "secret_input",
+    expectedResolvedValue: "string",
+    includeInPlan: true,
+    includeInConfigure: true,
+    includeInAudit: true,
+  },
+  {
+    id: "channels.mattermost.botToken",
+    targetType: "channels.mattermost.botToken",
+    configFile: "openclaw.json",
+    pathPattern: "channels.mattermost.botToken",
+    secretShape: "secret_input",
+    expectedResolvedValue: "string",
+    includeInPlan: true,
+    includeInConfigure: true,
+    includeInAudit: true,
+  },
+];
+
+export function collectRuntimeConfigAssignments(params: {
+  config: { channels?: Record<string, unknown> };
+  defaults?: SecretDefaults;
+  context: ResolverContext;
+}): void {
+  const resolved = getChannelSurface(params.config, "mattermost");
+  if (!resolved) {
+    return;
+  }
+  const { channel: mattermost, surface } = resolved;
+  collectSimpleChannelFieldAssignments({
+    channelKey: "mattermost",
+    field: "botToken",
+    channel: mattermost,
+    surface,
+    defaults: params.defaults,
+    context: params.context,
+    topInactiveReason: "no enabled account inherits this top-level Mattermost botToken.",
+    accountInactiveReason: "Mattermost account is disabled.",
+  });
+}
+
+export const channelSecrets = {
+  secretTargetRegistryEntries,
+  collectRuntimeConfigAssignments,
+};

extensions/mattermost/src/secret-input.ts

@@ -0,0 +1,8 @@
+// Mattermost plugin module implements secret input behavior.
+export type { SecretInput } from "openclaw/plugin-sdk/secret-input";
+export {
+  buildSecretInputSchema,
+  hasConfiguredSecretInput,
+  normalizeResolvedSecretInputString,
+  normalizeSecretInputString,
+} from "openclaw/plugin-sdk/secret-input";

extensions/mattermost/src/session-route.test.ts

@@ -0,0 +1,105 @@
+// Mattermost tests cover session route plugin behavior.
+import { describe, expect, it } from "vitest";
+import { resolveMattermostOutboundSessionRoute } from "./session-route.js";
+
+function expectRoute(route: ReturnType<typeof resolveMattermostOutboundSessionRoute>) {
+  if (!route) {
+    throw new Error("Expected Mattermost route");
+  }
+  return route;
+}
+
+describe("mattermost session route", () => {
+  it("builds direct-message routes for user targets", () => {
+    const route = resolveMattermostOutboundSessionRoute({
+      cfg: {},
+      agentId: "main",
+      accountId: "acct-1",
+      target: "@user123",
+    });
+
+    const directRoute = expectRoute(route);
+    expect(directRoute.peer.kind).toBe("direct");
+    expect(directRoute.peer.id).toBe("user123");
+    expect(directRoute.from).toBe("mattermost:user123");
+    expect(directRoute.to).toBe("user:user123");
+  });
+
+  it("builds threaded channel routes for channel targets", () => {
+    const route = resolveMattermostOutboundSessionRoute({
+      cfg: {},
+      agentId: "main",
+      accountId: "acct-1",
+      target: "mattermost:channel:chan123",
+      threadId: "thread456",
+    });
+
+    const channelRoute = expectRoute(route);
+    expect(channelRoute.peer.kind).toBe("channel");
+    expect(channelRoute.peer.id).toBe("chan123");
+    expect(channelRoute.from).toBe("mattermost:channel:chan123");
+    expect(channelRoute.to).toBe("channel:chan123");
+    expect(channelRoute.threadId).toBe("thread456");
+    expect(channelRoute.sessionKey).toContain("thread456");
+  });
+
+  it("recovers channel thread routes from currentSessionKey", () => {
+    const route = resolveMattermostOutboundSessionRoute({
+      cfg: {},
+      agentId: "main",
+      accountId: "acct-1",
+      target: "mattermost:channel:chan123",
+      currentSessionKey: "agent:main:mattermost:channel:chan123:thread:root-post",
+    });
+
+    const recoveredRoute = expectRoute(route);
+    expect(recoveredRoute.sessionKey).toBe(
+      "agent:main:mattermost:channel:chan123:thread:root-post",
+    );
+    expect(recoveredRoute.baseSessionKey).toBe("agent:main:mattermost:channel:chan123");
+    expect(recoveredRoute.threadId).toBe("root-post");
+  });
+
+  it("keeps explicit replyToId ahead of recovered currentSessionKey thread", () => {
+    const route = resolveMattermostOutboundSessionRoute({
+      cfg: {},
+      agentId: "main",
+      accountId: "acct-1",
+      target: "mattermost:channel:chan123",
+      replyToId: "explicit-root",
+      currentSessionKey: "agent:main:mattermost:channel:chan123:thread:root-post",
+    });
+
+    const replyRoute = expectRoute(route);
+    expect(replyRoute.sessionKey).toBe(
+      "agent:main:mattermost:channel:chan123:thread:explicit-root",
+    );
+    expect(replyRoute.threadId).toBe("explicit-root");
+  });
+
+  it('does not recover currentSessionKey threads for shared dmScope "main" DMs', () => {
+    const route = resolveMattermostOutboundSessionRoute({
+      cfg: {},
+      agentId: "main",
+      accountId: "acct-1",
+      target: "@user123",
+      currentSessionKey: "agent:main:main:thread:root-post",
+    });
+
+    const dmRoute = expectRoute(route);
+    expect(dmRoute.sessionKey).toBe("agent:main:main");
+    expect(dmRoute.baseSessionKey).toBe("agent:main:main");
+    expect(dmRoute.threadId).toBeUndefined();
+  });
+
+  it("returns null when the target is empty after normalization", () => {
+    expect(
+      resolveMattermostOutboundSessionRoute({
+        cfg: {},
+        agentId: "main",
+        accountId: "acct-1",
+        target: "mattermost:",
+      }),
+    ).toBeNull();
+  });
+});