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/oc-path/src/cli.test.ts

@@ -0,0 +1,434 @@
+/**
+ * Smoke tests for the `openclaw path` CLI handlers.
+ *
+ * Tests invoke each subcommand handler directly with a capturing
+ * `OutputRuntimeEnv` — no commander wiring, no child process spawn.
+ * Assertions inspect captured stdout/stderr and the exit code the
+ * handler set on the runtime.
+ */
+import { mkdtempSync, readFileSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import {
+  type OutputRuntimeEnv,
+  formatUnifiedDiff,
+  pathEmitCommand,
+  pathFindCommand,
+  pathResolveCommand,
+  pathSetCommand,
+  pathValidateCommand,
+} from "./cli.js";
+
+interface TestRuntime extends OutputRuntimeEnv {
+  readonly stdout: string[];
+  readonly stderr: string[];
+  exitCode: number;
+}
+
+function createTestRuntime(): TestRuntime {
+  const stdout: string[] = [];
+  const stderr: string[] = [];
+  const runtime: TestRuntime = {
+    stdout,
+    stderr,
+    exitCode: 0,
+    error: (value) => {
+      stderr.push(value);
+    },
+    writeStdout: (value) => {
+      stdout.push(value);
+    },
+    exit: (code) => {
+      runtime.exitCode = code;
+    },
+  };
+  return runtime;
+}
+
+const stdoutText = (rt: TestRuntime): string => rt.stdout.join("\n");
+const stderrText = (rt: TestRuntime): string => rt.stderr.join("\n");
+
+describe("openclaw path CLI", () => {
+  let workspaceDir: string;
+
+  beforeEach(() => {
+    workspaceDir = mkdtempSync(join(tmpdir(), "oc-path-cli-"));
+  });
+  afterEach(() => {
+    // mkdtemp leaves a small dir; OS will GC it. Skip cleanup to keep
+    // the test deterministic on Windows where rmdir flakes.
+  });
+
+  describe("validate", () => {
+    it("CLI-V01 accepts a well-formed path with --json", () => {
+      const rt = createTestRuntime();
+      pathValidateCommand("oc://AGENTS.md/Tools/-1", { json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.valid).toBe(true);
+      expect(out.structure.file).toBe("AGENTS.md");
+      expect(out.structure.section).toBe("Tools");
+    });
+
+    it("CLI-V02 rejects a malformed path with code 1", () => {
+      const rt = createTestRuntime();
+      pathValidateCommand("oc://X/a\x00b", { json: true }, rt);
+      expect(rt.exitCode).toBe(1);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.valid).toBe(false);
+    });
+
+    it("CLI-V03 missing argument returns 2", () => {
+      const rt = createTestRuntime();
+      pathValidateCommand(undefined, { json: true }, rt);
+      expect(rt.exitCode).toBe(2);
+      expect(stderrText(rt)).toContain("missing");
+    });
+  });
+
+  describe("resolve", () => {
+    it("CLI-R01 finds a leaf in jsonc and prints it", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, '{ "version": "1.0" }', "utf-8");
+      const rt = createTestRuntime();
+      await pathResolveCommand("oc://gateway.jsonc/version", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.resolved).toBe(true);
+      expect(out.match.kind).toBe("leaf");
+      expect(out.match.valueText).toBe("1.0");
+    });
+
+    it("CLI-R04 finds a leaf in yaml and prints it", async () => {
+      const filePath = join(workspaceDir, "workflow.yaml");
+      writeFileSync(filePath, "name: inbox-triage\nsteps:\n  - id: fetch\n", "utf-8");
+      const rt = createTestRuntime();
+      await pathResolveCommand(
+        "oc://workflow.yaml/steps/0/id",
+        { cwd: workspaceDir, json: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.resolved).toBe(true);
+      expect(out.match.kind).toBe("leaf");
+      expect(out.match.valueText).toBe("fetch");
+    });
+
+    it("CLI-R02 returns 1 for not-found path", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, '{ "version": "1.0" }', "utf-8");
+      const rt = createTestRuntime();
+      await pathResolveCommand("oc://gateway.jsonc/missing", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(1);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.resolved).toBe(false);
+    });
+
+    it("CLI-R03 missing argument returns 2", async () => {
+      const rt = createTestRuntime();
+      await pathResolveCommand(undefined, { json: true }, rt);
+      expect(rt.exitCode).toBe(2);
+      expect(stderrText(rt)).toContain("missing");
+    });
+  });
+
+  describe("set", () => {
+    it("CLI-S01 writes new bytes when path resolves", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, '{ "version": "1.0" }', "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://gateway.jsonc/version",
+        "2.0",
+        { cwd: workspaceDir, json: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const after = readFileSync(filePath, "utf-8");
+      expect(after).toContain('"2.0"');
+    });
+
+    it("CLI-S02 --dry-run does not write to disk", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      const before = '{ "version": "1.0" }';
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://gateway.jsonc/version",
+        "2.0",
+        { cwd: workspaceDir, json: true, dryRun: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.dryRun).toBe(true);
+      expect(out.bytes).toContain('"2.0"');
+      // File on disk unchanged.
+      expect(readFileSync(filePath, "utf-8")).toBe(before);
+    });
+
+    it("CLI-S05 --dry-run --diff prints a unified diff", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      const before = '{\n  "version": "1.0",\n  "enabled": true\n}\n';
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://gateway.jsonc/version",
+        "2.0",
+        { cwd: workspaceDir, human: true, dryRun: true, diff: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const out = stdoutText(rt);
+      expect(out).toContain("--- ");
+      expect(out).toContain("+++ ");
+      expect(out).toContain('-  "version": "1.0",');
+      expect(out).toContain('+  "version": "2.0",');
+      expect(readFileSync(filePath, "utf-8")).toBe(before);
+    });
+
+    it("CLI-S05b --dry-run --diff shows final newline-only byte changes", () => {
+      const out = formatUnifiedDiff(
+        "## Boundaries\n\n- timeout: 5\n",
+        "## Boundaries\n\n- timeout: 5",
+        "AGENTS.md",
+      );
+      expect(out).toContain("--- AGENTS.md");
+      expect(out).toContain("@@ -1,4 +1,3 @@");
+      expect(out).toContain("\n-\n");
+    });
+
+    it("CLI-S05c --dry-run --diff shows line-ending-only byte changes", async () => {
+      const filePath = join(workspaceDir, "AGENTS.md");
+      const before = "---\r\nname: x\r\n---\r\n";
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://AGENTS.md/[frontmatter]/name",
+        "x",
+        { cwd: workspaceDir, json: true, dryRun: true, diff: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.diff).toContain("-name: x\r");
+      expect(out.diff).toContain("+name: x");
+      expect(readFileSync(filePath, "utf-8")).toBe(before);
+    });
+
+    it("CLI-S06 --dry-run --diff includes diff in JSON output", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, '{ "version": "1.0" }', "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://gateway.jsonc/version",
+        "2.0",
+        { cwd: workspaceDir, json: true, dryRun: true, diff: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.dryRun).toBe(true);
+      expect(out.bytes).toContain('"2.0"');
+      expect(out.diff).toContain('-{ "version": "1.0" }');
+      expect(out.diff).toContain('+{ "version": "2.0" }');
+    });
+
+    it("CLI-S07 rejects --diff without --dry-run", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      const before = '{ "version": "1.0" }';
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://gateway.jsonc/version",
+        "2.0",
+        { cwd: workspaceDir, json: true, diff: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(1);
+      expect(JSON.parse(stdoutText(rt))).toMatchObject({
+        ok: false,
+        reason: "--diff requires --dry-run",
+      });
+      expect(readFileSync(filePath, "utf-8")).toBe(before);
+    });
+
+    it("CLI-S08 sets slash-deep JSONC paths and parsed JSON values", async () => {
+      const filePath = join(workspaceDir, "openclaw.json");
+      writeFileSync(
+        filePath,
+        '{ "agents": { "list": [{ "tools": { "exec": { "security": "deny" } } }] }, "gateway": { "auth": { "token": "${TOKEN}" } } }\n',
+        "utf-8",
+      );
+      const rt = createTestRuntime();
+
+      await pathSetCommand(
+        "oc://openclaw.json/gateway/auth/token",
+        '{"source":"file","provider":"secrets","id":"/test"}',
+        { cwd: workspaceDir, json: true, valueJson: true },
+        rt,
+      );
+
+      expect(rt.exitCode).toBe(0);
+      expect(JSON.parse(readFileSync(filePath, "utf8")).gateway.auth.token).toEqual({
+        source: "file",
+        provider: "secrets",
+        id: "/test",
+      });
+
+      const rt2 = createTestRuntime();
+      await pathSetCommand(
+        "oc://openclaw.json/agents/list/0/tools/exec/security",
+        "allowlist",
+        { cwd: workspaceDir, json: true },
+        rt2,
+      );
+
+      expect(rt2.exitCode).toBe(0);
+      expect(JSON.parse(readFileSync(filePath, "utf8")).agents.list[0].tools.exec.security).toBe(
+        "allowlist",
+      );
+    });
+
+    it("CLI-S03 sentinel-bearing value is refused at emit", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, '{ "token": "x" }', "utf-8");
+      const rt = createTestRuntime();
+      // The sentinel-bearing value is accepted into the AST by setOcPath,
+      // but `emitForKind` refuses to serialize it (defense-in-depth at
+      // the per-kind emit boundary). The CLI handler must catch that
+      // refusal and route it through the structured error boundary —
+      // a thrown error escaping commander would print raw `String(err)`
+      // and bypass our JSON/human scrubbing. Pin the structured shape:
+      // exit code 1, stable code OC_EMIT_SENTINEL, message scrubbed.
+      await pathSetCommand(
+        "oc://gateway.jsonc/token",
+        "__OPENCLAW_REDACTED__",
+        { cwd: workspaceDir, json: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(1);
+      expect(stderrText(rt)).toContain("OC_EMIT_SENTINEL");
+      // F13 — file context in sentinel error. Without fileNameForGuard
+      // plumbing through emitForKind, the message would carry the
+      // empty-slot fallback (`oc:///[raw]`); now it carries the actual
+      // file (`oc://gateway.jsonc/[raw]`). Forensics + audit pipelines
+      // rely on this — without the file context, "sentinel rejected
+      // somewhere" doesn't tell you WHICH file was involved.
+      expect(stderrText(rt)).toContain("gateway.jsonc");
+    });
+
+    it("CLI-S04 missing args returns 2", async () => {
+      const rt = createTestRuntime();
+      await pathSetCommand(undefined, undefined, { json: true }, rt);
+      expect(rt.exitCode).toBe(2);
+      expect(stderrText(rt)).toContain("requires");
+    });
+
+    it("CLI-S05 malformed yaml returns structured parse-error", async () => {
+      const filePath = join(workspaceDir, "workflow.yaml");
+      const before = "key: value\n  bad indent: oops\n";
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathSetCommand(
+        "oc://workflow.yaml/key",
+        "new-value",
+        { cwd: workspaceDir, json: true },
+        rt,
+      );
+      expect(rt.exitCode).toBe(1);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out).toMatchObject({ ok: false, reason: "parse-error" });
+      expect(readFileSync(filePath, "utf-8")).toBe(before);
+    });
+  });
+
+  describe("find", () => {
+    it("CLI-F01 enumerates wildcard matches", async () => {
+      const filePath = join(workspaceDir, "config.jsonc");
+      writeFileSync(filePath, '{ "items": [ { "id": "a" }, { "id": "b" } ] }', "utf-8");
+      const rt = createTestRuntime();
+      await pathFindCommand("oc://config.jsonc/items/*/id", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.count).toBe(2);
+    });
+
+    it("CLI-F02 returns 1 when zero matches", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      writeFileSync(filePath, "{}", "utf-8");
+      const rt = createTestRuntime();
+      await pathFindCommand("oc://gateway.jsonc/nope/*", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(1);
+    });
+
+    it("CLI-F03 file-slot wildcard rejected with clear error (no ENOENT)", async () => {
+      // Closes Galin P3 (round 8): `find` resolves `pattern.file` to one
+      // literal path, so `oc://*.jsonc/...` would silently ENOENT during
+      // fs.readFile. The CLI now surfaces a clear error before touching
+      // the filesystem, with stable code OC_PATH_FILE_WILDCARD_UNSUPPORTED.
+      const rt = createTestRuntime();
+      await pathFindCommand("oc://*.jsonc/items", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(2);
+      expect(stderrText(rt)).toContain("OC_PATH_FILE_WILDCARD_UNSUPPORTED");
+      expect(stderrText(rt)).toContain("file-slot wildcards are not supported");
+    });
+  });
+
+  describe("emit", () => {
+    it("CLI-E01 round-trips jsonc bytes verbatim (byte-fidelity proof)", async () => {
+      const filePath = join(workspaceDir, "gateway.jsonc");
+      const before = '// keep this comment\n{\n  "v": 1\n}\n';
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathEmitCommand(filePath, { json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.kind).toBe("jsonc");
+      expect(out.bytes).toBe(before);
+    });
+
+    it("CLI-E02 round-trips md verbatim", async () => {
+      const filePath = join(workspaceDir, "AGENTS.md");
+      const before = "## Tools\n- gh\n## Boundaries\n- never rm -rf\n";
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathEmitCommand(filePath, { json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.kind).toBe("md");
+      expect(out.bytes).toBe(before);
+    });
+
+    it("CLI-E04 round-trips yaml verbatim", async () => {
+      const filePath = join(workspaceDir, "workflow.yaml");
+      const before = "# keep comment\nname: inbox-triage\nsteps:\n  - id: fetch\n";
+      writeFileSync(filePath, before, "utf-8");
+      const rt = createTestRuntime();
+      await pathEmitCommand(filePath, { json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.kind).toBe("yaml");
+      expect(out.bytes).toBe(before);
+    });
+
+    it("CLI-E03 emit --cwd resolves <file> against the supplied directory", async () => {
+      // Closes round-10 finding F2: emit advertises --cwd / --file in
+      // the docs but the handler resolved <file> against process.cwd()
+      // ignoring both. Pin the new wiring: a relative <file> resolves
+      // against --cwd, not against process.cwd().
+      const filePath = join(workspaceDir, "AGENTS.md");
+      writeFileSync(filePath, "## Tools\n- gh\n", "utf-8");
+      const rt = createTestRuntime();
+      // Pass a RELATIVE filename + explicit --cwd. If the handler
+      // ignored --cwd, loadAst would ENOENT against process.cwd().
+      await pathEmitCommand("AGENTS.md", { cwd: workspaceDir, json: true }, rt);
+      expect(rt.exitCode).toBe(0);
+      const out = JSON.parse(stdoutText(rt));
+      expect(out.kind).toBe("md");
+      expect(out.bytes).toBe("## Tools\n- gh\n");
+    });
+  });
+});

extensions/oc-path/src/cli.ts

@@ -0,0 +1,591 @@
+/**
+ * `openclaw path` — shell access to the OcPath substrate verbs.
+ *
+ * Subcommands: `resolve` / `set` / `find` / `validate` / `emit`.
+ * TTY-aware output: human when interactive, JSON when piped; `--json`
+ * / `--human` override.
+ */
+
+import { promises as fs } from "node:fs";
+import { resolve as resolvePath } from "node:path";
+import type { Command } from "commander";
+import {
+  OcEmitSentinelError,
+  OcPathError,
+  REDACTED_SENTINEL,
+  emitJsonc,
+  emitJsonl,
+  emitMd,
+  emitYaml,
+  findOcPaths,
+  formatOcPath,
+  inferKind,
+  parseJsonc,
+  parseJsonl,
+  parseMd,
+  parseOcPath,
+  parseYaml,
+  resolveOcPath,
+  setOcPath,
+  type OcAst,
+  type OcMatch,
+  type OcPath,
+} from "./oc-path/index.js";
+
+export type OutputRuntimeEnv = {
+  writeStdout(value: string): void;
+  error(value: string): void;
+  exit(code: number): void;
+};
+
+export interface PathCommandOptions {
+  readonly json?: boolean;
+  readonly human?: boolean;
+  readonly valueJson?: boolean;
+  readonly cwd?: string;
+  readonly file?: string;
+  readonly dryRun?: boolean;
+  readonly diff?: boolean;
+}
+
+type OutputMode = "human" | "json";
+
+const SCRUB_PLACEHOLDER = "[REDACTED]";
+
+const defaultRuntime: OutputRuntimeEnv = {
+  writeStdout(value) {
+    process.stdout.write(value);
+  },
+  error(value) {
+    process.stderr.write(`${value}\n`);
+  },
+  exit(code) {
+    process.exitCode = code;
+  },
+};
+
+// Defense-in-depth: replace the redaction sentinel with `[REDACTED]`
+// before writing, even if upstream emits it.
+export function scrubSentinel(s: string): string {
+  if (!s.includes(REDACTED_SENTINEL)) {
+    return s;
+  }
+  return s.split(REDACTED_SENTINEL).join(SCRUB_PLACEHOLDER);
+}
+
+function detectMode(options: PathCommandOptions): OutputMode {
+  if (options.json === true) {
+    return "json";
+  }
+  if (options.human === true) {
+    return "human";
+  }
+  return process.stdout.isTTY ? "human" : "json";
+}
+
+function emit(
+  runtime: OutputRuntimeEnv,
+  mode: OutputMode,
+  value: unknown,
+  humanFallback: () => string,
+): void {
+  if (mode === "json") {
+    runtime.writeStdout(scrubSentinel(JSON.stringify(value, null, 2)));
+    return;
+  }
+  runtime.writeStdout(scrubSentinel(humanFallback()));
+}
+
+function emitError(
+  runtime: OutputRuntimeEnv,
+  mode: OutputMode,
+  message: string,
+  code = "ERR",
+): void {
+  const scrubbed = scrubSentinel(message);
+  if (mode === "json") {
+    runtime.error(JSON.stringify({ error: { code, message: scrubbed } }));
+    return;
+  }
+  runtime.error(`${code}: ${scrubbed}`);
+}
+
+/** Bail with usage error if a required arg is missing. */
+function requireArg<T>(
+  value: T | undefined,
+  usage: string,
+  runtime: OutputRuntimeEnv,
+  mode: OutputMode,
+): value is T extends undefined ? never : T {
+  if (value === undefined) {
+    emitError(runtime, mode, usage);
+    runtime.exit(2);
+    return false;
+  }
+  return true;
+}
+
+/** Parse an oc-path string; emit structured error and return null on failure. */
+function tryParse(pathStr: string, runtime: OutputRuntimeEnv, mode: OutputMode): OcPath | null {
+  try {
+    return parseOcPath(pathStr);
+  } catch (err) {
+    if (err instanceof OcPathError) {
+      emitError(runtime, mode, `parse failed: ${err.message}`, err.code);
+      runtime.exit(2);
+      return null;
+    }
+    throw err;
+  }
+}
+
+// Catch OcEmitSentinelError so it goes through the structured error
+// path; otherwise commander prints `String(err)` raw and bypasses the
+// `--json` scrubbed-error boundary.
+function catchSentinel<T>(
+  label: string,
+  runtime: OutputRuntimeEnv,
+  mode: OutputMode,
+  fn: () => T,
+): T | null {
+  try {
+    return fn();
+  } catch (err) {
+    if (err instanceof OcEmitSentinelError) {
+      emitError(runtime, mode, `${label} refused: ${err.message}`, "OC_EMIT_SENTINEL");
+      runtime.exit(1);
+      return null;
+    }
+    throw err;
+  }
+}
+
+async function loadAst(absPath: string, fileName: string): Promise<OcAst> {
+  const raw = await fs.readFile(absPath, "utf-8");
+  const kind = inferKind(fileName);
+  if (kind === "jsonc") {
+    return parseJsonc(raw).ast;
+  }
+  if (kind === "jsonl") {
+    return parseJsonl(raw).ast;
+  }
+  if (kind === "yaml") {
+    return parseYaml(raw).ast;
+  }
+  return parseMd(raw).ast;
+}
+
+function emitForKind(ast: OcAst, fileName?: string): string {
+  // Plumb fileName so sentinel errors carry file context.
+  const opts = fileName !== undefined ? { fileNameForGuard: fileName } : {};
+  switch (ast.kind) {
+    case "jsonc":
+      return emitJsonc(ast, opts);
+    case "jsonl":
+      return emitJsonl(ast, opts);
+    case "md":
+      return emitMd(ast, opts);
+    case "yaml":
+      return emitYaml(ast, opts);
+  }
+  return "";
+}
+
+function resolveFsPath(path: OcPath, options: PathCommandOptions): string {
+  if (options.file !== undefined) {
+    return resolvePath(options.file);
+  }
+  return resolvePath(options.cwd ?? process.cwd(), path.file);
+}
+
+function formatMatchHuman(match: OcMatch): string {
+  if (match.kind === "leaf") {
+    return `leaf @ L${match.line}: ${JSON.stringify(match.valueText)} (${match.leafType})`;
+  }
+  if (match.kind === "node") {
+    return `node @ L${match.line} [${match.descriptor}]`;
+  }
+  if (match.kind === "insertion-point") {
+    return `insertion-point @ L${match.line} [${match.container}]`;
+  }
+  return `root @ L${match.line}`;
+}
+
+function splitDiffLines(s: string): readonly string[] {
+  return s === "" ? [] : s.split("\n");
+}
+
+export function formatUnifiedDiff(oldBytes: string, newBytes: string, fsPath: string): string {
+  if (oldBytes === newBytes) {
+    return "";
+  }
+  const oldLines = splitDiffLines(oldBytes);
+  const newLines = splitDiffLines(newBytes);
+  let prefix = 0;
+  while (
+    prefix < oldLines.length &&
+    prefix < newLines.length &&
+    oldLines[prefix] === newLines[prefix]
+  ) {
+    prefix++;
+  }
+
+  let oldSuffix = oldLines.length - 1;
+  let newSuffix = newLines.length - 1;
+  while (
+    oldSuffix >= prefix &&
+    newSuffix >= prefix &&
+    oldLines[oldSuffix] === newLines[newSuffix]
+  ) {
+    oldSuffix--;
+    newSuffix--;
+  }
+
+  const context = 3;
+  const hunkStart = Math.max(0, prefix - context);
+  const hunkOldEnd = Math.min(oldLines.length - 1, oldSuffix + context);
+  const hunkNewEnd = Math.min(newLines.length - 1, newSuffix + context);
+  const oldCount = Math.max(0, hunkOldEnd - hunkStart + 1);
+  const newCount = Math.max(0, hunkNewEnd - hunkStart + 1);
+  const lines = [
+    `--- ${fsPath}`,
+    `+++ ${fsPath}`,
+    `@@ -${hunkStart + 1},${oldCount} +${hunkStart + 1},${newCount} @@`,
+  ];
+
+  for (let i = hunkStart; i < prefix; i++) {
+    lines.push(` ${oldLines[i] ?? ""}`);
+  }
+  for (let i = prefix; i <= oldSuffix; i++) {
+    lines.push(`-${oldLines[i] ?? ""}`);
+  }
+  for (let i = prefix; i <= newSuffix; i++) {
+    lines.push(`+${newLines[i] ?? ""}`);
+  }
+  for (let i = Math.max(oldSuffix + 1, prefix); i <= hunkOldEnd; i++) {
+    lines.push(` ${oldLines[i] ?? ""}`);
+  }
+  return `${lines.join("\n")}\n`;
+}
+
+// ---------- Commands -----------------------------------------------------
+
+export async function pathResolveCommand(
+  pathStr: string | undefined,
+  options: PathCommandOptions,
+  runtime: OutputRuntimeEnv,
+): Promise<void> {
+  const mode = detectMode(options);
+  if (!requireArg(pathStr, "resolve: missing <oc-path> argument", runtime, mode)) {
+    return;
+  }
+  const ocPath = tryParse(pathStr, runtime, mode);
+  if (ocPath === null) {
+    return;
+  }
+  const ast = await loadAst(resolveFsPath(ocPath, options), ocPath.file);
+  let match: OcMatch | null;
+  try {
+    match = resolveOcPath(ast, ocPath);
+  } catch (err) {
+    if (err instanceof OcPathError) {
+      // resolveOcPath throws on wildcard patterns — point at find.
+      emitError(runtime, mode, `resolve refused: ${err.message}`, err.code);
+      runtime.exit(2);
+      return;
+    }
+    throw err;
+  }
+  if (match === null) {
+    emit(runtime, mode, { resolved: false, ocPath: pathStr }, () => `not found: ${pathStr}`);
+    runtime.exit(1);
+    return;
+  }
+  emit(runtime, mode, { resolved: true, ocPath: pathStr, match }, () => formatMatchHuman(match));
+}
+
+export async function pathSetCommand(
+  pathStr: string | undefined,
+  value: string | undefined,
+  options: PathCommandOptions,
+  runtime: OutputRuntimeEnv,
+): Promise<void> {
+  const mode = detectMode(options);
+  if (!requireArg(pathStr, "set: requires <oc-path> <value>", runtime, mode)) {
+    return;
+  }
+  if (!requireArg(value, "set: requires <oc-path> <value>", runtime, mode)) {
+    return;
+  }
+  if (options.diff === true && options.dryRun !== true) {
+    emit(
+      runtime,
+      mode,
+      { ok: false, reason: "--diff requires --dry-run" },
+      () => "set failed: --diff requires --dry-run",
+    );
+    runtime.exit(1);
+    return;
+  }
+  const ocPath = tryParse(pathStr, runtime, mode);
+  if (ocPath === null) {
+    return;
+  }
+  const fsPath = resolveFsPath(ocPath, options);
+  const oldBytes = await fs.readFile(fsPath, "utf-8");
+  const ast = await loadAst(fsPath, ocPath.file);
+
+  const result = catchSentinel("set", runtime, mode, () =>
+    setOcPath(ast, ocPath, value, { valueJson: options.valueJson === true }),
+  );
+  if (result === null) {
+    return;
+  }
+  if (!result.ok) {
+    const detail = "detail" in result ? result.detail : undefined;
+    emit(
+      runtime,
+      mode,
+      { ok: false, reason: result.reason, detail },
+      () => `set failed: ${result.reason}${detail !== undefined ? ` — ${detail}` : ""}`,
+    );
+    runtime.exit(1);
+    return;
+  }
+  // Per-kind emit can still refuse the sentinel even after set succeeds.
+  const newBytes = catchSentinel("emit", runtime, mode, () => emitForKind(result.ast, ocPath.file));
+  if (newBytes === null) {
+    return;
+  }
+
+  if (options.dryRun === true) {
+    const diff = options.diff === true ? formatUnifiedDiff(oldBytes, newBytes, fsPath) : undefined;
+    emit(
+      runtime,
+      mode,
+      { ok: true, dryRun: true, bytes: newBytes, ...(diff !== undefined ? { diff } : {}) },
+      () =>
+        diff !== undefined
+          ? diff || `--dry-run: no byte changes for ${fsPath}`
+          : `--dry-run: would write ${newBytes.length} bytes to ${fsPath}\n${newBytes}`,
+    );
+    return;
+  }
+  await fs.writeFile(fsPath, newBytes, "utf-8");
+  emit(
+    runtime,
+    mode,
+    { ok: true, dryRun: false, bytesWritten: newBytes.length, fsPath },
+    () => `wrote ${newBytes.length} bytes to ${fsPath}`,
+  );
+}
+
+export async function pathFindCommand(
+  patternStr: string | undefined,
+  options: PathCommandOptions,
+  runtime: OutputRuntimeEnv,
+): Promise<void> {
+  const mode = detectMode(options);
+  if (!requireArg(patternStr, "find: missing <pattern> argument", runtime, mode)) {
+    return;
+  }
+  const pattern = tryParse(patternStr, runtime, mode);
+  if (pattern === null) {
+    return;
+  }
+  // File-slot wildcards would silently ENOENT during readFile; reject.
+  if (/[*?]/.test(pattern.file)) {
+    emitError(
+      runtime,
+      mode,
+      `find: file-slot wildcards are not supported (got "${pattern.file}"). ` +
+        `Pass a concrete file path; multi-file globbing is a follow-up feature.`,
+      "OC_PATH_FILE_WILDCARD_UNSUPPORTED",
+    );
+    runtime.exit(2);
+    return;
+  }
+  const ast = await loadAst(resolveFsPath(pattern, options), pattern.file);
+  const matches = findOcPaths(ast, pattern);
+  emit(
+    runtime,
+    mode,
+    {
+      pattern: patternStr,
+      count: matches.length,
+      matches: matches.map((m) => ({ path: formatOcPath(m.path), match: m.match })),
+    },
+    () => {
+      if (matches.length === 0) {
+        return `0 matches for ${patternStr}`;
+      }
+      const plural = matches.length === 1 ? "" : "es";
+      const lines = [`${matches.length} match${plural} for ${patternStr}:`];
+      for (const m of matches) {
+        lines.push(`  ${formatOcPath(m.path)}  →  ${formatMatchHuman(m.match)}`);
+      }
+      return lines.join("\n");
+    },
+  );
+  if (matches.length === 0) {
+    runtime.exit(1);
+  }
+}
+
+export function pathValidateCommand(
+  pathStr: string | undefined,
+  options: PathCommandOptions,
+  runtime: OutputRuntimeEnv,
+): void {
+  const mode = detectMode(options);
+  if (!requireArg(pathStr, "validate: missing <oc-path> argument", runtime, mode)) {
+    return;
+  }
+  try {
+    const ocPath = parseOcPath(pathStr);
+    emit(
+      runtime,
+      mode,
+      {
+        valid: true,
+        ocPath: pathStr,
+        formatted: formatOcPath(ocPath),
+        structure: {
+          file: ocPath.file,
+          section: ocPath.section,
+          item: ocPath.item,
+          field: ocPath.field,
+          session: ocPath.session,
+        },
+      },
+      () => {
+        const lines = [`valid: ${pathStr}`, `  file:    ${ocPath.file}`];
+        if (ocPath.section !== undefined) {
+          lines.push(`  section: ${ocPath.section}`);
+        }
+        if (ocPath.item !== undefined) {
+          lines.push(`  item:    ${ocPath.item}`);
+        }
+        if (ocPath.field !== undefined) {
+          lines.push(`  field:   ${ocPath.field}`);
+        }
+        if (ocPath.session !== undefined) {
+          lines.push(`  session: ${ocPath.session}`);
+        }
+        return lines.join("\n");
+      },
+    );
+  } catch (err) {
+    if (err instanceof OcPathError) {
+      emit(
+        runtime,
+        mode,
+        { valid: false, code: err.code, message: err.message },
+        () => `INVALID: ${err.code}: ${err.message}`,
+      );
+      runtime.exit(1);
+      return;
+    }
+    throw err;
+  }
+}
+
+export async function pathEmitCommand(
+  fileArg: string | undefined,
+  options: PathCommandOptions,
+  runtime: OutputRuntimeEnv,
+): Promise<void> {
+  const mode = detectMode(options);
+  if (!requireArg(fileArg, "emit: missing <file> argument", runtime, mode)) {
+    return;
+  }
+  const fsPath =
+    options.file !== undefined
+      ? resolvePath(options.file)
+      : resolvePath(options.cwd ?? process.cwd(), fileArg);
+  const fileName = fsPath.split(/[\\/]/).pop() ?? fileArg;
+  const ast = await loadAst(fsPath, fileName);
+  const bytes = catchSentinel("emit", runtime, mode, () => emitForKind(ast, fileName));
+  if (bytes === null) {
+    return;
+  }
+  if (mode === "json") {
+    runtime.writeStdout(scrubSentinel(JSON.stringify({ ok: true, kind: ast.kind, bytes })));
+    return;
+  }
+  runtime.writeStdout(bytes);
+}
+
+// ---------- Commander wiring ---------------------------------------------
+
+function withCommonOpts(cmd: Command): Command {
+  return cmd
+    .option("--json", "Force JSON output")
+    .option("--human", "Force human output")
+    .option("--cwd <dir>", "Resolve file slot against this directory")
+    .option("--file <file>", "Override the file slot's resolved path");
+}
+
+export function registerPathCli(program: Command): void {
+  const path = program
+    .command("path")
+    .description("Inspect and edit workspace files via the oc:// addressing scheme")
+    .addHelpText("after", "\nDocs: https://docs.openclaw.ai/cli/path\n");
+
+  withCommonOpts(
+    path
+      .command("resolve")
+      .description("Print the match at an oc:// path")
+      .argument("<oc-path>", "oc:// path to resolve"),
+  ).action(async (pathStr: string, opts: PathCommandOptions) => {
+    await pathResolveCommand(pathStr, opts, defaultRuntime);
+  });
+
+  withCommonOpts(
+    path
+      .command("find")
+      .description("Enumerate matches for a wildcard / predicate oc:// pattern")
+      .argument("<pattern>", "oc:// pattern"),
+  ).action(async (patternStr: string, opts: PathCommandOptions) => {
+    await pathFindCommand(patternStr, opts, defaultRuntime);
+  });
+
+  withCommonOpts(
+    path
+      .command("set")
+      .description("Write a leaf value at an oc:// path")
+      .argument("<oc-path>", "oc:// path to write")
+      .argument("<value>", "string value to write")
+      .option("--value-json", "Parse <value> as JSON for JSON/JSONC/JSONL leaf replacement")
+      .option("--dry-run", "Print bytes without writing")
+      .option("--diff", "With --dry-run, print a unified diff instead of full bytes"),
+  ).action(async (pathStr: string, value: string, opts: PathCommandOptions) => {
+    await pathSetCommand(pathStr, value, opts, defaultRuntime);
+  });
+
+  path
+    .command("validate")
+    .description("Parse an oc:// path and print its slot structure")
+    .argument("<oc-path>", "oc:// path to validate")
+    .option("--json", "Force JSON output")
+    .option("--human", "Force human output")
+    .action((pathStr: string, opts: PathCommandOptions) => {
+      pathValidateCommand(pathStr, opts, defaultRuntime);
+    });
+
+  withCommonOpts(
+    path
+      .command("emit")
+      .description("Round-trip a file through parse + emit")
+      .argument("<file>", "Path to a workspace file"),
+  ).action(async (fileArg: string, opts: PathCommandOptions) => {
+    await pathEmitCommand(fileArg, opts, defaultRuntime);
+  });
+
+  // Bare `openclaw path` prints help and exits 0 (matches the core
+  // applyParentDefaultHelpAction contract — see openclaw#73077).
+  path.action(() => {
+    path.outputHelp();
+    process.exitCode = 0;
+  });
+}

extensions/oc-path/src/oc-path/ast.ts

@@ -0,0 +1,64 @@
+/**
+ * Markdown AST — addressing index for workspace files.
+ *
+ * Pure addressing structure; no per-file opinions (those live in lint
+ * rules). Byte-fidelity: `emitMd(parse(raw)) === raw`; `raw` on the
+ * root preserves the original bytes for round-trip.
+ *
+ * @module @openclaw/oc-path/ast
+ */
+
+/** Parser diagnostic. Severity `warning` for recoverable input; never throws. */
+export interface Diagnostic {
+  readonly line: number;
+  readonly message: string;
+  readonly severity: "info" | "warning" | "error";
+  readonly code?: string;
+}
+
+/** Frontmatter entry. Values unquoted (`"`/`'` stripped) but otherwise verbatim. */
+export interface FrontmatterEntry {
+  readonly key: string;
+  readonly value: string;
+  readonly line: number;
+}
+
+/**
+ * Bullet item. `slug` is the addressing key (kv.key when present, else
+ * item text). `kv` is populated for `- key: value` bullets.
+ */
+export interface AstItem {
+  readonly text: string;
+  readonly slug: string;
+  readonly line: number;
+  readonly kv?: { readonly key: string; readonly value: string };
+}
+
+/**
+ * H2-delimited block. `bodyText` is the verbatim prose between this
+ * heading and the next; `items` are extracted for addressing.
+ *
+ * Tables and code blocks aren't first-class — addressing into them is
+ * out of scope. Lint rules re-tokenize `bodyText` if needed.
+ */
+export interface AstBlock {
+  readonly heading: string;
+  readonly slug: string;
+  readonly line: number;
+  readonly bodyText: string;
+  readonly items: readonly AstItem[];
+}
+
+/** Root AST. `raw` carries the original bytes for byte-identical round-trip. */
+export interface MdAst {
+  readonly kind: "md";
+  readonly raw: string;
+  readonly frontmatter: readonly FrontmatterEntry[];
+  readonly preamble: string;
+  readonly blocks: readonly AstBlock[];
+}
+
+export interface ParseResult {
+  readonly ast: MdAst;
+  readonly diagnostics: readonly Diagnostic[];
+}

extensions/oc-path/src/oc-path/dispatch.ts

@@ -0,0 +1,34 @@
+/**
+ * Cross-kind utilities. `inferKind` is a convention helper for callers
+ * who want to map filename to the parser they should use before calling
+ * the universal verbs (`resolveOcPath`, `findOcPaths`, `setOcPath`).
+ *
+ * Encoding remains per-kind (`parseMd`, `parseJsonc`, `parseJsonl`),
+ * while addressing and mutation dispatch are universal once callers
+ * have an AST carrying its `kind` discriminator.
+ *
+ * @module @openclaw/oc-path/dispatch
+ */
+
+export type OcKind = "md" | "jsonc" | "jsonl" | "yaml";
+
+/**
+ * Recommend a kind from a filename. Pure convention helper — returns
+ * the substrate's default mapping. Consumers can override.
+ */
+export function inferKind(filename: string): OcKind | null {
+  const lower = filename.toLowerCase();
+  if (lower.endsWith(".md")) {
+    return "md";
+  }
+  if (lower.endsWith(".jsonl") || lower.endsWith(".ndjson")) {
+    return "jsonl";
+  }
+  if (lower.endsWith(".jsonc") || lower.endsWith(".json")) {
+    return "jsonc";
+  }
+  if (lower.endsWith(".yaml") || lower.endsWith(".yml") || lower.endsWith(".lobster")) {
+    return "yaml";
+  }
+  return null;
+}

extensions/oc-path/src/oc-path/edit.ts

@@ -0,0 +1,151 @@
+/**
+ * Mutate `MdAst` at an OcPath. Returns a new AST; original unchanged.
+ *
+ *   oc://FILE/[frontmatter]/key   → frontmatter value
+ *   oc://FILE/section/item/field  → item.kv.value
+ *
+ * Section bodies aren't writable through this primitive.
+ *
+ * @module @openclaw/oc-path/edit
+ */
+
+import type { AstBlock, AstItem, FrontmatterEntry, MdAst } from "./ast.js";
+import { formatOcPath, type OcPath } from "./oc-path.js";
+import { guardSentinel } from "./sentinel.js";
+
+export type MdEditResult =
+  | { readonly ok: true; readonly ast: MdAst }
+  | {
+      readonly ok: false;
+      readonly reason: "unresolved" | "not-writable" | "no-item-kv";
+    };
+
+// Sentinel guard at the boundary keeps md symmetric with jsonc/jsonl,
+// which both reject sentinel values before they reach the AST.
+export function setMdOcPath(ast: MdAst, path: OcPath, newValue: string): MdEditResult {
+  guardSentinel(newValue, formatOcPath(path));
+  if (path.section === "[frontmatter]") {
+    const key = path.item ?? path.field;
+    if (key === undefined) {
+      return { ok: false, reason: "unresolved" };
+    }
+    const idx = ast.frontmatter.findIndex((e) => e.key === key);
+    if (idx === -1) {
+      return { ok: false, reason: "unresolved" };
+    }
+    const existing = ast.frontmatter[idx];
+    if (existing === undefined) {
+      return { ok: false, reason: "unresolved" };
+    }
+    const newEntry: FrontmatterEntry = { ...existing, value: newValue };
+    const newFm = ast.frontmatter.slice();
+    newFm[idx] = newEntry;
+    return finalize({ ...ast, frontmatter: newFm });
+  }
+
+  if (path.section === undefined || path.item === undefined || path.field === undefined) {
+    return { ok: false, reason: "not-writable" };
+  }
+
+  const sectionSlug = path.section.toLowerCase();
+  const blockIdx = ast.blocks.findIndex((b) => b.slug === sectionSlug);
+  if (blockIdx === -1) {
+    return { ok: false, reason: "unresolved" };
+  }
+  const block = ast.blocks[blockIdx];
+  if (block === undefined) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const itemSlug = path.item.toLowerCase();
+  const itemIdx = block.items.findIndex((i) => i.slug === itemSlug);
+  if (itemIdx === -1) {
+    return { ok: false, reason: "unresolved" };
+  }
+  const item = block.items[itemIdx];
+  if (item === undefined) {
+    return { ok: false, reason: "unresolved" };
+  }
+  if (item.kv === undefined) {
+    return { ok: false, reason: "no-item-kv" };
+  }
+  if (item.kv.key.toLowerCase() !== path.field.toLowerCase()) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const newItem: AstItem = { ...item, kv: { key: item.kv.key, value: newValue } };
+  const newItems = block.items.slice();
+  newItems[itemIdx] = newItem;
+  const newBlock: AstBlock = {
+    ...block,
+    items: newItems,
+    bodyText: rebuildBlockBody(block, newItems),
+  };
+  const newBlocks = ast.blocks.slice();
+  newBlocks[blockIdx] = newBlock;
+  return finalize({ ...ast, blocks: newBlocks });
+}
+
+// In-place substitution on `bodyText` so round-trip emit reflects the
+// edit. Items without a matching bullet line are skipped (render mode
+// uses structural fields anyway).
+function rebuildBlockBody(block: AstBlock, newItems: readonly AstItem[]): string {
+  let body = block.bodyText;
+  for (let i = 0; i < newItems.length; i++) {
+    const newItem = newItems[i];
+    const oldItem = block.items[i];
+    if (newItem === undefined || oldItem === undefined) {
+      continue;
+    }
+    if (newItem.kv === undefined || oldItem.kv === undefined) {
+      continue;
+    }
+    if (newItem.kv.value === oldItem.kv.value) {
+      continue;
+    }
+    const re = new RegExp(`^(\\s*-\\s*${escapeRegex(oldItem.kv.key)}\\s*:\\s*).*$`, "m");
+    body = body.replace(re, `$1${newItem.kv.value}`);
+  }
+  return body;
+}
+
+function escapeRegex(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+
+function finalize(ast: MdAst): MdEditResult {
+  const parts: string[] = [];
+  if (ast.frontmatter.length > 0) {
+    parts.push("---");
+    for (const fm of ast.frontmatter) {
+      parts.push(`${fm.key}: ${formatFrontmatterValue(fm.value)}`);
+    }
+    parts.push("---");
+  }
+  if (ast.preamble.length > 0) {
+    if (parts.length > 0) {
+      parts.push("");
+    }
+    parts.push(ast.preamble);
+  }
+  for (const block of ast.blocks) {
+    if (parts.length > 0) {
+      parts.push("");
+    }
+    parts.push(`## ${block.heading}`);
+    if (block.bodyText.length > 0) {
+      parts.push(block.bodyText);
+    }
+  }
+  return { ok: true, ast: { ...ast, raw: parts.join("\n") } };
+}
+
+function formatFrontmatterValue(value: string): string {
+  if (value.length === 0) {
+    return '""';
+  }
+  if (/[:#&*?|<>=!%@`,[\]{}\r\n]/.test(value)) {
+    return JSON.stringify(value);
+  }
+  return value;
+}

extensions/oc-path/src/oc-path/emit.ts

@@ -0,0 +1,130 @@
+/**
+ * Emit an AST back to bytes.
+ *
+ * **Two modes**:
+ *
+ *   1. **Round-trip** — the AST hasn't been mutated since `parseMd`
+ *      produced it. Returns `ast.raw` verbatim. Byte-identical.
+ *
+ *   2. **Mutation-aware** — the AST has been modified (frontmatter
+ *      entry edited, item kv.value changed, block reordered). Returns
+ *      a freshly-rendered representation. **Not** byte-identical to a
+ *      hypothetical "perfect" rewrite — we render canonical forms
+ *      (LF endings, single space after `:` in frontmatter, etc.).
+ *      Callers needing byte-fidelity for partial edits should patch
+ *      `raw` directly instead of mutating the AST.
+ *
+ * In both modes, every emitted leaf flows through `guardSentinel` so a
+ * `__OPENCLAW_REDACTED__` literal anywhere in the output throws
+ * `OcEmitSentinelError`. This is the substrate guard: callers can't
+ * accidentally write a redacted view to disk through this emitter.
+ *
+ * @module @openclaw/oc-path/emit
+ */
+
+import type { FrontmatterEntry, MdAst } from "./ast.js";
+import { guardSentinel } from "./sentinel.js";
+
+/**
+ * Emit options. `mode: 'roundtrip'` (default) returns `ast.raw` if
+ * present and not flagged as dirty; `mode: 'render'` always
+ * re-renders.
+ */
+export interface EmitOptions {
+  readonly mode?: "roundtrip" | "render";
+  /**
+   * When provided, the emitter walks every emitted leaf string through
+   * `guardSentinel(value, ocPath)`. Default uses the file name
+   * (`oc://<file>`) when the field-precise path can't be determined.
+   * Callers that want richer error context can supply `ocPathFor` to
+   * compute a path per leaf.
+   */
+  readonly fileNameForGuard?: string;
+  /**
+   * See `JsoncEmitOptions.acceptPreExistingSentinel` for the rationale.
+   * Default `true` — round-trip echoes parsed bytes without scanning
+   * for the sentinel. Render mode scans every leaf regardless.
+   */
+  readonly acceptPreExistingSentinel?: boolean;
+}
+
+/**
+ * Emit the AST. In render mode, throws `OcEmitSentinelError` if any
+ * leaf string matches `REDACTED_SENTINEL`. In round-trip mode, echoes
+ * `ast.raw` verbatim (does not scan unless caller opts in via
+ * `acceptPreExistingSentinel: false`).
+ */
+export function emitMd(ast: MdAst, opts: EmitOptions = {}): string {
+  const mode = opts.mode ?? "roundtrip";
+  const guardPath = opts.fileNameForGuard ? `oc://${opts.fileNameForGuard}` : "oc://";
+  const acceptPreExisting = opts.acceptPreExistingSentinel ?? true;
+
+  if (mode === "roundtrip") {
+    // Round-trip trusts parsed bytes — see emit-policy comment in
+    // jsonc/emit.ts. A markdown file legitimately containing the
+    // sentinel literal (in a code block, in a pasted error log) would
+    // otherwise become a workspace-wide emit DoS.
+    if (!acceptPreExisting && ast.raw.includes("__OPENCLAW_REDACTED__")) {
+      guardSentinel("__OPENCLAW_REDACTED__", `${guardPath}/[raw]`);
+    }
+    return ast.raw;
+  }
+
+  // Render mode: rebuild from structural fields. This loses
+  // formatting details (extra blank lines, custom whitespace, etc.)
+  // but is correct.
+  const parts: string[] = [];
+
+  if (ast.frontmatter.length > 0) {
+    parts.push("---");
+    for (const fm of ast.frontmatter) {
+      guardSentinel(fm.value, `${guardPath}/[frontmatter]/${fm.key}`);
+      parts.push(`${fm.key}: ${formatFrontmatterValue(fm.value)}`);
+    }
+    parts.push("---");
+  }
+
+  if (ast.preamble.length > 0) {
+    guardSentinel(ast.preamble, `${guardPath}/[preamble]`);
+    if (parts.length > 0) {
+      parts.push("");
+    }
+    parts.push(ast.preamble);
+  }
+
+  for (const block of ast.blocks) {
+    if (parts.length > 0) {
+      parts.push("");
+    }
+    parts.push(`## ${block.heading}`);
+    if (block.bodyText.length > 0) {
+      // Walk items + frontmatter-key value strings for sentinels;
+      // body text is also walked as one big string in case of any raw
+      // sentinel.
+      guardSentinel(block.bodyText, `${guardPath}/${block.slug}/[body]`);
+      for (const item of block.items) {
+        if (item.kv) {
+          guardSentinel(item.kv.value, `${guardPath}/${block.slug}/${item.slug}/${item.kv.key}`);
+        }
+      }
+      parts.push(block.bodyText);
+    }
+  }
+
+  return parts.join("\n");
+}
+
+function formatFrontmatterValue(value: string): string {
+  // Frontmatter is yaml-ish; quote values with structural chars.
+  if (value.length === 0) {
+    return '""';
+  }
+  if (/[:#&*?|<>=!%@`,[\]{}\r\n]/.test(value)) {
+    return JSON.stringify(value);
+  }
+  return value;
+}
+
+// Re-export the frontmatter type for convenience so tests don't need
+// to import from ast.ts.
+export type { FrontmatterEntry };

extensions/oc-path/src/oc-path/find.ts

@@ -0,0 +1,817 @@
+/**
+ * `findOcPaths` — multi-match verb. `*` matches one sub-segment;
+ * `**` matches zero or more (recursive). Returns concrete OcPaths
+ * preserving the input pattern's slot shape, so each result is
+ * pipeable into `resolveOcPath` / `setOcPath`.
+ *
+ * @module @openclaw/oc-path/find
+ */
+
+import { isMap, isScalar, isSeq, type Node, type Pair } from "yaml";
+import type { MdAst } from "./ast.js";
+import type { JsoncValue } from "./jsonc/ast.js";
+import type { JsonlAst, JsonlLine } from "./jsonl/ast.js";
+import { pickJsonlLine } from "./jsonl/line.js";
+import type { OcPath } from "./oc-path.js";
+import {
+  MAX_TRAVERSAL_DEPTH,
+  OcPathError,
+  WILDCARD_RECURSIVE,
+  WILDCARD_SINGLE,
+  evaluatePredicate,
+  isOrdinalSeg,
+  isPositionalSeg,
+  isPredicateSeg,
+  isQuotedSeg,
+  isUnionSeg,
+  parseArrayIndexSegment,
+  parseOrdinalSeg,
+  parsePredicateSeg,
+  parseUnionSeg,
+  quoteSeg,
+  resolvePositionalSeg,
+  splitRespectingBrackets,
+  unquoteSeg,
+} from "./oc-path.js";
+import type { PredicateSpec } from "./oc-path.js";
+import type { OcAst, OcMatch } from "./universal.js";
+import { resolveOcPath } from "./universal.js";
+
+// ---------- Public types ---------------------------------------------------
+
+/** A find result: a concrete (wildcard-free) path plus its match info. */
+export interface OcPathMatch {
+  readonly path: OcPath;
+  readonly match: OcMatch;
+}
+
+type Slot = "section" | "item" | "field";
+interface SlotSub {
+  readonly slot: Slot;
+  readonly value: string;
+}
+interface PatternSub {
+  readonly slot: Slot;
+  readonly value: string;
+}
+
+type OnMatch = (subs: readonly SlotSub[]) => void;
+
+// ---------- Public verb ----------------------------------------------------
+
+export function findOcPaths(ast: OcAst, pattern: OcPath): readonly OcPathMatch[] {
+  const subs = patternSubs(pattern);
+  // Fast-path: no expansion needed — pure literals just resolve.
+  const needsExpansion = subs.some(
+    (s) =>
+      s.value === WILDCARD_SINGLE ||
+      s.value === WILDCARD_RECURSIVE ||
+      isPositionalSeg(s.value) ||
+      isUnionSeg(s.value) ||
+      isPredicateSeg(s.value),
+  );
+  if (!needsExpansion) {
+    const m = resolveOcPath(ast, pattern);
+    return m === null ? [] : [{ path: pattern, match: m }];
+  }
+
+  const concretePaths: OcPath[] = [];
+  const onMatch: OnMatch = (slotSubs) => {
+    concretePaths.push(repackSlotSubs(pattern, slotSubs));
+  };
+  switch (ast.kind) {
+    case "jsonc":
+      if (ast.root !== null) {
+        walkJsonc(ast.root, subs, 0, [], onMatch);
+      }
+      break;
+    case "jsonl":
+      walkJsonl(ast, subs, 0, [], onMatch);
+      break;
+    case "md":
+      walkMd({ kind: "root", ast }, subs, 0, [], onMatch);
+      break;
+    case "yaml":
+      if (ast.doc.contents !== null) {
+        walkYaml(ast.doc.contents, subs, 0, [], onMatch);
+      }
+      break;
+  }
+
+  const out: OcPathMatch[] = [];
+  for (const concrete of concretePaths) {
+    const m = resolveOcPath(ast, concrete);
+    if (m !== null) {
+      out.push({ path: concrete, match: m });
+    }
+  }
+  return out;
+}
+
+// ---------- Pattern unpacking ---------------------------------------------
+
+function patternSubs(pattern: OcPath): readonly PatternSub[] {
+  const out: PatternSub[] = [];
+  // Bracket-aware split so dots inside `[k=1.0]` or `{a.b,c}` aren't
+  // treated as sub-segment delimiters.
+  if (pattern.section !== undefined) {
+    for (const v of splitRespectingBrackets(pattern.section, ".")) {
+      out.push({ slot: "section", value: v });
+    }
+  }
+  if (pattern.item !== undefined) {
+    for (const v of splitRespectingBrackets(pattern.item, ".")) {
+      out.push({ slot: "item", value: v });
+    }
+  }
+  if (pattern.field !== undefined) {
+    for (const v of splitRespectingBrackets(pattern.field, ".")) {
+      out.push({ slot: "field", value: v });
+    }
+  }
+  return out;
+}
+
+function repackSlotSubs(pattern: OcPath, slotSubs: readonly SlotSub[]): OcPath {
+  const sectionSubs: string[] = [];
+  const itemSubs: string[] = [];
+  const fieldSubs: string[] = [];
+  for (const s of slotSubs) {
+    if (s.slot === "section") {
+      sectionSubs.push(s.value);
+    } else if (s.slot === "item") {
+      itemSubs.push(s.value);
+    } else {
+      fieldSubs.push(s.value);
+    }
+  }
+  return {
+    file: pattern.file,
+    ...(sectionSubs.length > 0 ? { section: sectionSubs.join(".") } : {}),
+    ...(itemSubs.length > 0 ? { item: itemSubs.join(".") } : {}),
+    ...(fieldSubs.length > 0 ? { field: fieldSubs.join(".") } : {}),
+    ...(pattern.session !== undefined ? { session: pattern.session } : {}),
+  };
+}
+
+// ---------- Shared dispatch ----------------------------------------------
+
+// Per-kind ops the dispatcher uses to drive recursion. Each kind's
+// walker fills these in; the dispatcher handles every segment shape.
+interface WalkOps<T> {
+  enumerate(node: T): Iterable<{ keySub: string; child: T }>;
+  lookup(node: T, key: string): { keySub: string; child: T } | null;
+  positional(node: T, seg: string): { keySub: string; child: T } | null;
+  predicate(node: T, pred: PredicateSpec): Iterable<{ keySub: string; child: T }>;
+  walk(
+    node: T,
+    subs: readonly PatternSub[],
+    i: number,
+    walked: readonly SlotSub[],
+    onMatch: OnMatch,
+  ): void;
+}
+
+function checkDepth(walked: readonly SlotSub[]): void {
+  if (walked.length > MAX_TRAVERSAL_DEPTH) {
+    throw new OcPathError(
+      `findOcPaths exceeded MAX_TRAVERSAL_DEPTH (${MAX_TRAVERSAL_DEPTH}) — likely a pathological pattern`,
+      "",
+      "OC_PATH_DEPTH_EXCEEDED",
+    );
+  }
+}
+
+function dispatchSeg<T>(
+  node: T,
+  ops: WalkOps<T>,
+  subs: readonly PatternSub[],
+  i: number,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  const cur = subs[i];
+
+  if (isUnionSeg(cur.value)) {
+    const alts = parseUnionSeg(cur.value);
+    if (alts === null) {
+      return;
+    }
+    for (const alt of alts) {
+      const altSubs = subs.slice();
+      altSubs[i] = { slot: cur.slot, value: alt };
+      ops.walk(node, altSubs, i, walked, onMatch);
+    }
+    return;
+  }
+
+  if (isPredicateSeg(cur.value)) {
+    const pred = parsePredicateSeg(cur.value);
+    if (pred === null) {
+      return;
+    }
+    for (const m of ops.predicate(node, pred)) {
+      ops.walk(m.child, subs, i + 1, [...walked, { slot: cur.slot, value: m.keySub }], onMatch);
+    }
+    return;
+  }
+
+  if (cur.value === WILDCARD_RECURSIVE) {
+    // `**` — descend with `**` consumed (i+1) AND retained (i) so
+    // deeper structures still match. Emit if no subs remain.
+    if (i + 1 >= subs.length) {
+      onMatch(walked);
+    }
+    for (const m of ops.enumerate(node)) {
+      const nextWalked: readonly SlotSub[] = [...walked, { slot: cur.slot, value: m.keySub }];
+      ops.walk(m.child, subs, i + 1, nextWalked, onMatch);
+      ops.walk(m.child, subs, i, nextWalked, onMatch);
+    }
+    return;
+  }
+
+  if (cur.value === WILDCARD_SINGLE) {
+    for (const m of ops.enumerate(node)) {
+      ops.walk(m.child, subs, i + 1, [...walked, { slot: cur.slot, value: m.keySub }], onMatch);
+    }
+    return;
+  }
+
+  if (isPositionalSeg(cur.value)) {
+    const m = ops.positional(node, cur.value);
+    if (m === null) {
+      return;
+    }
+    ops.walk(m.child, subs, i + 1, [...walked, { slot: cur.slot, value: m.keySub }], onMatch);
+    return;
+  }
+
+  const m = ops.lookup(node, cur.value);
+  if (m === null) {
+    return;
+  }
+  ops.walk(m.child, subs, i + 1, [...walked, { slot: cur.slot, value: m.keySub }], onMatch);
+}
+
+// ---------- JSONC walker ---------------------------------------------------
+
+function walkJsonc(
+  node: JsoncValue,
+  subs: readonly PatternSub[],
+  i: number,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  checkDepth(walked);
+  if (i >= subs.length) {
+    onMatch(walked);
+    return;
+  }
+  dispatchSeg(node, jsoncOps, subs, i, walked, onMatch);
+}
+
+const jsoncOps: WalkOps<JsoncValue> = {
+  *enumerate(node) {
+    if (node.kind === "object") {
+      for (const e of node.entries) {
+        yield { keySub: quoteSeg(e.key), child: e.value };
+      }
+    } else if (node.kind === "array") {
+      for (let idx = 0; idx < node.items.length; idx++) {
+        yield { keySub: String(idx), child: node.items[idx] };
+      }
+    }
+  },
+  lookup(node, key) {
+    if (node.kind === "object") {
+      // Entry keys are unquoted in the AST; strip quotes from a quoted
+      // path key so the walker matches the resolver's behavior.
+      const lookupKey = isQuotedSeg(key) ? unquoteSeg(key) : key;
+      const e = node.entries.find((entry) => entry.key === lookupKey);
+      return e === undefined ? null : { keySub: key, child: e.value };
+    }
+    if (node.kind === "array") {
+      const idx = parseArrayIndexSegment(key, node.items.length);
+      if (idx === null) {
+        return null;
+      }
+      return { keySub: key, child: node.items[idx] };
+    }
+    return null;
+  },
+  positional(node, seg) {
+    const concrete = positionalForJsoncNode(node, seg);
+    if (concrete === null) {
+      return null;
+    }
+    return jsoncOps.lookup(node, concrete);
+  },
+  *predicate(node, pred) {
+    if (node.kind === "object") {
+      for (const e of node.entries) {
+        if (jsoncChildMatchesPredicate(e.value, pred)) {
+          yield { keySub: quoteSeg(e.key), child: e.value };
+        }
+      }
+    } else if (node.kind === "array") {
+      for (let idx = 0; idx < node.items.length; idx++) {
+        if (jsoncChildMatchesPredicate(node.items[idx], pred)) {
+          yield { keySub: String(idx), child: node.items[idx] };
+        }
+      }
+    }
+  },
+  walk: walkJsonc,
+};
+
+function positionalForJsoncNode(node: JsoncValue, seg: string): string | null {
+  if (node.kind === "object") {
+    const keys = node.entries.map((e) => e.key);
+    return resolvePositionalSeg(seg, { indexable: false, size: keys.length, keys });
+  }
+  if (node.kind === "array") {
+    return resolvePositionalSeg(seg, { indexable: true, size: node.items.length });
+  }
+  return null;
+}
+
+// ---------- JSONL walker ---------------------------------------------------
+
+// First slot is a line address; subsequent slots descend into the
+// line's jsonc value via jsonlOps.walk's holder unwrap.
+function walkJsonl(
+  ast: JsonlAst,
+  subs: readonly PatternSub[],
+  i: number,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  checkDepth(walked);
+  if (i >= subs.length) {
+    onMatch(walked);
+    return;
+  }
+  if (walked.length === 0) {
+    dispatchSeg(ast, jsonlOps, subs, i, walked, onMatch);
+  }
+}
+
+const jsonlOps: WalkOps<JsonlAst> = {
+  *enumerate(ast) {
+    for (const l of ast.lines) {
+      if (l.kind === "value") {
+        yield { keySub: `L${l.line}`, child: lineHolder(ast, l) };
+      }
+    }
+  },
+  lookup(ast, key) {
+    const line = pickJsonlLine(ast, key);
+    if (line === null) {
+      return null;
+    }
+    const concreteAddr = line.kind === "value" ? `L${line.line}` : key;
+    return { keySub: concreteAddr, child: lineHolder(ast, line) };
+  },
+  positional(ast, seg) {
+    return jsonlOps.lookup(ast, seg);
+  },
+  *predicate(ast, pred) {
+    for (const l of ast.lines) {
+      if (l.kind !== "value") {
+        continue;
+      }
+      const actual = topLevelLeafText(l.value, pred.key);
+      if (evaluatePredicate(actual, pred)) {
+        yield { keySub: `L${l.line}`, child: lineHolder(ast, l) };
+      }
+    }
+  },
+  // After the line slot is consumed, descend into the line's jsonc
+  // value via the holder's WeakMap-tagged line. Otherwise this is a
+  // top-level walkJsonl entry — go through line-slot dispatch.
+  walk(child, subs, i, walked, onMatch) {
+    const line = unwrapHolder(child);
+    if (line === null) {
+      walkJsonl(child, subs, i, walked, onMatch);
+      return;
+    }
+    if (i >= subs.length) {
+      onMatch(walked);
+      return;
+    }
+    if (line.kind !== "value") {
+      return;
+    }
+    walkJsonc(line.value, subs, i, walked, onMatch);
+  },
+};
+
+// JsonlAst-typed wrapper around a single line so jsonlOps.walk can
+// distinguish "top-level ast (descend the line slot)" from "we
+// already picked a line, walk inside it." A WeakMap keeps the wrapping
+// structural (no JsonlAst surface change).
+const lineByHolder = new WeakMap<object, JsonlLine>();
+function lineHolder(ast: JsonlAst, line: JsonlLine): JsonlAst {
+  // Synthesize a tagged JsonlAst that carries the chosen line. The
+  // outer structure is preserved (kind, raw, lines) so type checks
+  // remain happy; the WeakMap holds the per-line tag.
+  const holder: JsonlAst = { kind: "jsonl", raw: ast.raw, lines: ast.lines };
+  lineByHolder.set(holder, line);
+  return holder;
+}
+function unwrapHolder(holder: JsonlAst): JsonlLine | null {
+  return lineByHolder.get(holder) ?? null;
+}
+
+function topLevelLeafText(value: JsoncValue, key: string): string | null {
+  if (value.kind !== "object") {
+    return null;
+  }
+  const entry = value.entries.find((e) => e.key === key);
+  if (entry === undefined) {
+    return null;
+  }
+  const v = entry.value;
+  if (v.kind === "string") {
+    return v.value;
+  }
+  if (v.kind === "number" || v.kind === "boolean") {
+    return String(v.value);
+  }
+  return null;
+}
+
+// ---------- YAML walker ----------------------------------------------------
+
+function walkYaml(
+  node: Node,
+  subs: readonly PatternSub[],
+  i: number,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  checkDepth(walked);
+  if (i >= subs.length) {
+    onMatch(walked);
+    return;
+  }
+  dispatchSeg(node, yamlOps, subs, i, walked, onMatch);
+}
+
+const yamlOps: WalkOps<Node> = {
+  *enumerate(node) {
+    if (isMap(node)) {
+      for (const p of (node as { items: readonly Pair[] }).items) {
+        const k = isScalar(p.key) ? p.key.value : p.key;
+        if (p.value !== null) {
+          yield { keySub: quoteSeg(String(k)), child: p.value as Node };
+        }
+      }
+    } else if (isSeq(node)) {
+      for (let idx = 0; idx < node.items.length; idx++) {
+        const child = node.items[idx];
+        if (child !== null) {
+          yield { keySub: String(idx), child: child as Node };
+        }
+      }
+    }
+  },
+  lookup(node, key) {
+    if (isMap(node)) {
+      const lookupKey = isQuotedSeg(key) ? unquoteSeg(key) : key;
+      const pair = (node as { items: readonly Pair[] }).items.find((p) => {
+        const k = isScalar(p.key) ? p.key.value : p.key;
+        return String(k) === lookupKey;
+      });
+      return pair?.value === undefined || pair.value === null
+        ? null
+        : { keySub: key, child: pair.value as Node };
+    }
+    if (isSeq(node)) {
+      const idx = parseArrayIndexSegment(key, node.items.length);
+      if (idx === null) {
+        return null;
+      }
+      const child = node.items[idx];
+      if (child === null) {
+        return null;
+      }
+      return { keySub: key, child: child as Node };
+    }
+    return null;
+  },
+  positional(node, seg) {
+    const concrete = positionalForYamlNode(node, seg);
+    return concrete === null ? null : yamlOps.lookup(node, concrete);
+  },
+  *predicate(node, pred) {
+    if (isMap(node)) {
+      for (const p of (node as { items: readonly Pair[] }).items) {
+        const k = isScalar(p.key) ? p.key.value : p.key;
+        if (p.value !== null && yamlChildMatchesPredicate(p.value as Node, pred)) {
+          yield { keySub: quoteSeg(String(k)), child: p.value as Node };
+        }
+      }
+    } else if (isSeq(node)) {
+      for (let idx = 0; idx < node.items.length; idx++) {
+        const child = node.items[idx];
+        if (child !== null && yamlChildMatchesPredicate(child as Node, pred)) {
+          yield { keySub: String(idx), child: child as Node };
+        }
+      }
+    }
+  },
+  walk: walkYaml,
+};
+
+function positionalForYamlNode(node: Node, seg: string): string | null {
+  if (isMap(node)) {
+    const keys = (node as { items: readonly Pair[] }).items.map((p) =>
+      String(isScalar(p.key) ? p.key.value : p.key),
+    );
+    return resolvePositionalSeg(seg, { indexable: false, size: keys.length, keys });
+  }
+  if (isSeq(node)) {
+    return resolvePositionalSeg(seg, { indexable: true, size: node.items.length });
+  }
+  return null;
+}
+
+function yamlChildMatchesPredicate(node: Node, pred: PredicateSpec): boolean {
+  return evaluatePredicate(yamlChildFieldText(node, pred.key), pred);
+}
+
+function yamlChildFieldText(node: Node, key: string): string | null {
+  if (!isMap(node)) {
+    return null;
+  }
+  const pair = (node as { items: readonly Pair[] }).items.find((p) => {
+    const k = isScalar(p.key) ? p.key.value : p.key;
+    return String(k) === key;
+  });
+  if (pair === undefined || pair.value === null) {
+    return null;
+  }
+  return yamlScalarToText(pair.value);
+}
+
+function yamlScalarToText(value: unknown): string | null {
+  if (!isScalar(value)) {
+    return null;
+  }
+  const scalar = value.value;
+  if (typeof scalar === "string") {
+    return scalar;
+  }
+  if (typeof scalar === "number" || typeof scalar === "boolean") {
+    return String(scalar);
+  }
+  if (scalar === null) {
+    return "null";
+  }
+  if (typeof scalar === "bigint" || typeof scalar === "symbol") {
+    return scalar.toString();
+  }
+  if (scalar instanceof Date) {
+    return scalar.toISOString();
+  }
+  return JSON.stringify(scalar) ?? null;
+}
+
+// ---------- Markdown walker -----------------------------------------------
+
+type MdItem = MdAst["blocks"][number]["items"][number];
+type MdBlock = MdAst["blocks"][number];
+
+type MdLevel =
+  | { readonly kind: "root"; readonly ast: MdAst }
+  | { readonly kind: "block"; readonly block: MdBlock; readonly ast: MdAst }
+  | { readonly kind: "item"; readonly item: MdItem; readonly ast: MdAst };
+
+function walkMd(
+  level: MdLevel,
+  subs: readonly PatternSub[],
+  i: number,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  if (i >= subs.length) {
+    onMatch(walked);
+    return;
+  }
+  const cur = subs[i];
+
+  // Frontmatter sentinel short-circuits regular dispatch.
+  if (level.kind === "root" && walked.length === 0 && cur.value === "[frontmatter]") {
+    const next = subs[i + 1];
+    if (next === undefined) {
+      onMatch([{ slot: cur.slot, value: cur.value }]);
+      return;
+    }
+    if (next.value === WILDCARD_SINGLE || next.value === WILDCARD_RECURSIVE) {
+      for (const fm of level.ast.frontmatter) {
+        onMatch([
+          { slot: cur.slot, value: cur.value },
+          { slot: next.slot, value: fm.key },
+        ]);
+      }
+      return;
+    }
+    const fmKey = isQuotedSeg(next.value) ? unquoteSeg(next.value) : next.value;
+    const entry = level.ast.frontmatter.find((e) => e.key === fmKey);
+    if (entry === undefined) {
+      return;
+    }
+    onMatch([
+      { slot: cur.slot, value: cur.value },
+      { slot: next.slot, value: next.value },
+    ]);
+    return;
+  }
+
+  // Item-level field slot is terminal — descending would loop.
+  if (level.kind === "item") {
+    walkMdItemField(level.item, cur, walked, onMatch);
+    return;
+  }
+
+  dispatchSeg(level, mdOps, subs, i, walked, onMatch);
+}
+
+function walkMdItemField(
+  item: MdItem,
+  cur: PatternSub,
+  walked: readonly SlotSub[],
+  onMatch: OnMatch,
+): void {
+  if (item.kv === undefined) {
+    return;
+  }
+  const key = item.kv.key;
+  const emit = (value: string): void => {
+    onMatch([...walked, { slot: cur.slot, value }]);
+  };
+  if (isUnionSeg(cur.value)) {
+    const alts = parseUnionSeg(cur.value);
+    if (alts === null) {
+      return;
+    }
+    for (const alt of alts) {
+      if (alt.toLowerCase() === key.toLowerCase()) {
+        emit(key);
+      }
+    }
+    return;
+  }
+  if (isPredicateSeg(cur.value)) {
+    const pred = parsePredicateSeg(cur.value);
+    if (pred !== null && mdItemMatchesPredicate(item, pred)) {
+      emit(key);
+    }
+    return;
+  }
+  if (cur.value === WILDCARD_SINGLE || cur.value === WILDCARD_RECURSIVE) {
+    emit(key);
+    return;
+  }
+  if (key.toLowerCase() === cur.value.toLowerCase()) {
+    emit(cur.value);
+  }
+}
+
+function blockSlugCounts(items: readonly MdItem[]): Map<string, number> {
+  const counts = new Map<string, number>();
+  for (const item of items) {
+    counts.set(item.slug, (counts.get(item.slug) ?? 0) + 1);
+  }
+  return counts;
+}
+
+// `mdOps` only handles root / block levels. Item-level dispatch is
+// terminal and runs inline in `walkMd` (see `walkMdItemField`).
+const mdOps: WalkOps<MdLevel> = {
+  *enumerate(level) {
+    if (level.kind === "root") {
+      for (const block of level.ast.blocks) {
+        yield { keySub: block.slug, child: { kind: "block", block, ast: level.ast } };
+      }
+      return;
+    }
+    if (level.kind === "block") {
+      // Disambiguate duplicate slugs via `#N` ordinal so each emitted
+      // path round-trips through resolveOcPath to its own item.
+      const counts = blockSlugCounts(level.block.items);
+      for (let idx = 0; idx < level.block.items.length; idx++) {
+        const item = level.block.items[idx];
+        const seg = (counts.get(item.slug) ?? 0) > 1 ? `#${idx}` : item.slug;
+        yield { keySub: seg, child: { kind: "item", item, ast: level.ast } };
+      }
+    }
+  },
+  lookup(level, key) {
+    if (level.kind === "root") {
+      const target = key.toLowerCase();
+      const block = level.ast.blocks.find((b) => b.slug === target);
+      return block === undefined
+        ? null
+        : { keySub: key, child: { kind: "block", block, ast: level.ast } };
+    }
+    if (level.kind === "block") {
+      // Ordinal `#N` short-circuits slug lookup.
+      if (isOrdinalSeg(key)) {
+        const n = parseOrdinalSeg(key);
+        if (n === null || n < 0 || n >= level.block.items.length) {
+          return null;
+        }
+        return { keySub: key, child: { kind: "item", item: level.block.items[n], ast: level.ast } };
+      }
+      const target = key.toLowerCase();
+      const item = level.block.items.find((it) => it.slug === target);
+      return item === undefined
+        ? null
+        : { keySub: key, child: { kind: "item", item, ast: level.ast } };
+    }
+    return null;
+  },
+  positional(level, seg) {
+    if (level.kind !== "block") {
+      return null;
+    }
+    const concrete = resolvePositionalSeg(seg, {
+      indexable: true,
+      size: level.block.items.length,
+    });
+    if (concrete === null) {
+      return null;
+    }
+    // Preserve the positional token in keySub so the resolver
+    // re-evaluates positionally on round-trip.
+    const item = level.block.items[Number(concrete)];
+    return { keySub: seg, child: { kind: "item", item, ast: level.ast } };
+  },
+  *predicate(level, pred) {
+    if (level.kind === "root") {
+      for (const block of level.ast.blocks) {
+        if (mdBlockHasMatchingItem(block, pred)) {
+          yield { keySub: block.slug, child: { kind: "block", block, ast: level.ast } };
+        }
+      }
+      return;
+    }
+    if (level.kind === "block") {
+      const counts = blockSlugCounts(level.block.items);
+      for (let idx = 0; idx < level.block.items.length; idx++) {
+        const item = level.block.items[idx];
+        if (mdItemMatchesPredicate(item, pred)) {
+          const seg = (counts.get(item.slug) ?? 0) > 1 ? `#${idx}` : item.slug;
+          yield { keySub: seg, child: { kind: "item", item, ast: level.ast } };
+        }
+      }
+    }
+  },
+  walk: walkMd,
+};
+
+function mdItemMatchesPredicate(item: MdItem, pred: PredicateSpec): boolean {
+  if (item.kv === undefined) {
+    return false;
+  }
+  if (item.kv.key.toLowerCase() !== pred.key.toLowerCase()) {
+    return false;
+  }
+  return evaluatePredicate(item.kv.value, pred);
+}
+
+function mdBlockHasMatchingItem(block: MdBlock, pred: PredicateSpec): boolean {
+  for (const item of block.items) {
+    if (mdItemMatchesPredicate(item, pred)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+function jsoncChildMatchesPredicate(node: JsoncValue, pred: PredicateSpec): boolean {
+  return evaluatePredicate(jsoncChildFieldText(node, pred.key), pred);
+}
+
+function jsoncChildFieldText(node: JsoncValue, key: string): string | null {
+  if (node.kind !== "object") {
+    return null;
+  }
+  const e = node.entries.find((entry) => entry.key === key);
+  if (e === undefined) {
+    return null;
+  }
+  const v = e.value;
+  if (v.kind === "string") {
+    return v.value;
+  }
+  if (v.kind === "number" || v.kind === "boolean") {
+    return String(v.value);
+  }
+  if (v.kind === "null") {
+    return "null";
+  }
+  return null;
+}

extensions/oc-path/src/oc-path/index.ts

@@ -0,0 +1,111 @@
+/**
+ * `@openclaw/oc-path` — substrate package public surface.
+ *
+ * **Strategic frame**: workspace files are byte-stable and addressable
+ * via the `oc://` scheme — the addressing scheme is universal across
+ * file kinds (md / jsonc / jsonl / yaml). Encoding (parse/emit) is per-kind;
+ * addressing (resolve/set) is universal.
+ *
+ * **Public verbs**:
+ *   - One `resolveOcPath(ast, path)` - concrete, kind-dispatched
+ *   - One `findOcPaths(ast, pattern)` - multi-match, kind-dispatched
+ *   - One `setOcPath(ast, path, value)` - concrete mutation / insertion
+ *   - Per-kind `parseXxx` / `emitXxx` (parsing is per-kind by nature)
+ *
+ * `setOcPath` accepts a string value; the substrate coerces based on
+ * AST shape at the path location. The OcPath syntax encodes the
+ * operation: plain path = leaf set, `+` suffix = insertion.
+ *
+ * Per-kind set/resolve helpers exist as internal implementation; they
+ * aren't on the public surface. Callers don't need to pick a kind -
+ * the AST carries its `kind` discriminator and the universal verbs
+ * dispatch internally.
+ *
+ * @module @openclaw/oc-path
+ */
+
+// AST types
+export type { AstBlock, AstItem, Diagnostic, FrontmatterEntry, ParseResult, MdAst } from "./ast.js";
+export type { JsoncAst, JsoncEntry, JsoncValue } from "./jsonc/ast.js";
+export type { JsonlAst, JsonlLine } from "./jsonl/ast.js";
+export type { YamlAst } from "./yaml/ast.js";
+
+// OcPath types + parser/formatter
+export type { OcPath, PathSegmentLayout, PositionalContainer, PredicateSpec } from "./oc-path.js";
+// Public OcPath surface — what plugin authors and callers use.
+export {
+  MAX_PATH_LENGTH,
+  MAX_SUB_SEGMENTS_PER_SLOT,
+  MAX_TRAVERSAL_DEPTH,
+  OcPathError,
+  POS_FIRST,
+  POS_LAST,
+  WILDCARD_RECURSIVE,
+  WILDCARD_SINGLE,
+  formatOcPath,
+  hasWildcard,
+  isOrdinalSeg,
+  isPattern,
+  isPositionalSeg,
+  isPredicateSeg,
+  isQuotedSeg,
+  isUnionSeg,
+  isValidOcPath,
+  parseOcPath,
+} from "./oc-path.js";
+
+// `evaluatePredicate`, `getPathLayout`, `parseOrdinalSeg`,
+// `parsePredicateSeg`, `parseUnionSeg`, `quoteSeg`, `unquoteSeg`,
+// `resolvePositionalSeg`, `splitRespectingBrackets`
+// were exported from earlier prototypes. They're substrate-internal
+// helpers — used by `find.ts`, the per-kind resolvers, and the parser
+// itself, but not part of the upstream-portable public surface.
+// Callers that need their behavior should round-trip through
+// `parseOcPath` / `formatOcPath` / `findOcPaths`.
+
+// Per-kind parse / emit (encoding is genuinely per-kind)
+export { parseMd } from "./parse.js";
+export { parseJsonc } from "./jsonc/parse.js";
+export { parseJsonl } from "./jsonl/parse.js";
+export { parseYaml } from "./yaml/parse.js";
+export type { JsoncParseResult } from "./jsonc/parse.js";
+export type { JsonlParseResult } from "./jsonl/parse.js";
+export type { YamlParseResult } from "./yaml/parse.js";
+
+export type { EmitOptions } from "./emit.js";
+export { emitMd } from "./emit.js";
+export type { JsoncEmitOptions } from "./jsonc/emit.js";
+export { emitJsonc } from "./jsonc/emit.js";
+export type { JsonlEmitOptions } from "./jsonl/emit.js";
+export { emitJsonl } from "./jsonl/emit.js";
+export type { YamlEmitOptions } from "./yaml/emit.js";
+export { emitYaml } from "./yaml/emit.js";
+
+// Universal verbs — the only public resolve / set on the surface.
+export type {
+  OcAst,
+  OcMatch,
+  LeafType,
+  NodeDescriptor,
+  ContainerKind,
+  SetResult,
+  InsertionInfo,
+} from "./universal.js";
+export { resolveOcPath, setOcPath, detectInsertion } from "./universal.js";
+
+// Multi-match search verb — the wildcard-accepting cousin of resolve.
+export type { OcPathMatch } from "./find.js";
+export { findOcPaths } from "./find.js";
+
+// Cross-kind utility — filename → kind hint.
+export { inferKind } from "./dispatch.js";
+export type { OcKind } from "./dispatch.js";
+
+// Sentinel guard
+export { OcEmitSentinelError, REDACTED_SENTINEL, guardSentinel } from "./sentinel.js";
+
+// Slug helper
+export { slugify } from "./slug.js";
+
+// Workspace manifest is a separate concern (filesystem classifier);
+// it's not part of this PR's scope.

extensions/oc-path/src/oc-path/jsonc/ast.ts

@@ -0,0 +1,49 @@
+/**
+ * JSONC AST types — the addressing skeleton for JSONC files (gateway
+ * config, plugin manifests, JSON-with-comments artifacts).
+ *
+ * **Per-kind discriminator**: every AST in this substrate carries a
+ * `kind` field. The OcPath resolver dispatches on `kind` so md / jsonc
+ * / json / jsonl can share one resolver entry point.
+ *
+ * **Byte-fidelity**: `raw` is preserved on the root for round-trip
+ * emit. The minimal prototype parser doesn't preserve every formatting
+ * detail in the structural tree — for production, a fuller
+ * comment-preserving parser ports from `openclaw-workspace`.
+ *
+ * @module @openclaw/oc-path/jsonc/ast
+ */
+
+/** The root JSONC AST. `raw` round-trips byte-identical via emit. */
+export interface JsoncAst {
+  readonly kind: "jsonc";
+  readonly raw: string;
+  /** Parsed value tree, or `null` if the file is empty / unparseable. */
+  readonly root: JsoncValue | null;
+}
+
+/**
+ * A JSONC value node — discriminated union over the standard JSON kinds.
+ *
+ * `line` is the 1-based line where the value's literal token starts
+ * (the `{`, `[`, opening `"`, or first digit). The parser always sets
+ * it; synthetic constructions (mutations, fixtures) may omit it and
+ * consumers fall back to 1 / parent line. Optional rather than
+ * required so test fixtures and externally-constructed values stay
+ * concise.
+ */
+export type JsoncValue =
+  | { readonly kind: "object"; readonly entries: readonly JsoncEntry[]; readonly line?: number }
+  | { readonly kind: "array"; readonly items: readonly JsoncValue[]; readonly line?: number }
+  | { readonly kind: "string"; readonly value: string; readonly line?: number }
+  | { readonly kind: "number"; readonly value: number; readonly line?: number }
+  | { readonly kind: "boolean"; readonly value: boolean; readonly line?: number }
+  | { readonly kind: "null"; readonly line?: number };
+
+/** Object key/value entry. Keys are unquoted; quoting happens at emit. */
+export interface JsoncEntry {
+  readonly key: string;
+  readonly value: JsoncValue;
+  /** 1-based line number of the key. */
+  readonly line: number;
+}

extensions/oc-path/src/oc-path/jsonc/edit.ts

@@ -0,0 +1,146 @@
+// OC Path module implements edit behavior.
+import { applyEdits, modify } from "jsonc-parser/lib/esm/main.js";
+import type { OcPath } from "../oc-path.js";
+import {
+  isPositionalSeg,
+  isQuotedSeg,
+  parseArrayIndexSegment,
+  resolvePositionalSeg,
+  splitRespectingBrackets,
+  unquoteSeg,
+} from "../oc-path.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../sentinel.js";
+import type { JsoncAst, JsoncValue } from "./ast.js";
+import { parseJsonc } from "./parse.js";
+
+type JsoncEditPath = Array<string | number>;
+
+export type JsoncEditResult =
+  | { readonly ok: true; readonly ast: JsoncAst }
+  | { readonly ok: false; readonly reason: "unresolved" | "no-root" };
+
+export function setJsoncOcPath(ast: JsoncAst, path: OcPath, newValue: JsoncValue): JsoncEditResult {
+  if (ast.root === null) {
+    return { ok: false, reason: "no-root" };
+  }
+
+  const segments = resolveEditSegments(ast.root, pathSegments(path));
+  if (segments === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+  guardSentinel(newValue, `oc://${path.file}/${segments.join("/")}`);
+
+  const edits = modify(ast.raw, segments, jsoncValueToJson(newValue), {
+    formattingOptions: { insertSpaces: true, tabSize: 2 },
+    isArrayInsertion: false,
+  });
+  if (edits.length === 0) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const nextRaw = applyEdits(ast.raw, edits);
+  const reparsed = parseJsonc(nextRaw);
+  if (reparsed.ast.root === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+  return { ok: true, ast: reparsed.ast };
+}
+
+function guardSentinel(value: JsoncValue, guardPath: string): void {
+  if (value.kind === "string") {
+    if (value.value.includes(REDACTED_SENTINEL)) {
+      throw new OcEmitSentinelError(guardPath);
+    }
+    return;
+  }
+  if (value.kind === "array") {
+    value.items.forEach((item, index) => guardSentinel(item, `${guardPath}/${index}`));
+    return;
+  }
+  if (value.kind === "object") {
+    value.entries.forEach((entry) => guardSentinel(entry.value, `${guardPath}/${entry.key}`));
+  }
+}
+
+function pathSegments(path: OcPath): string[] {
+  const out: string[] = [];
+  const collect = (slot: string | undefined) => {
+    if (slot === undefined) {
+      return;
+    }
+    for (const segment of splitRespectingBrackets(slot, ".")) {
+      out.push(isQuotedSeg(segment) ? unquoteSeg(segment) : segment);
+    }
+  };
+  collect(path.section);
+  collect(path.item);
+  collect(path.field);
+  return out;
+}
+
+function resolveEditSegments(root: JsoncValue, segments: readonly string[]): JsoncEditPath | null {
+  const out: JsoncEditPath = [];
+  let current: JsoncValue = root;
+  for (let segment of segments) {
+    if (segment.length === 0) {
+      return null;
+    }
+    if (isPositionalSeg(segment)) {
+      const concrete = positionalForJsonc(current, segment);
+      if (concrete !== null) {
+        segment = concrete;
+      }
+    }
+    if (current.kind === "object") {
+      const entry = current.entries.find((candidate) => candidate.key === segment);
+      if (!entry) {
+        return null;
+      }
+      out.push(segment);
+      current = entry.value;
+      continue;
+    }
+    if (current.kind === "array") {
+      const index = parseArrayIndexSegment(segment, current.items.length);
+      if (index === null) {
+        return null;
+      }
+      out.push(index);
+      current = current.items[index]!;
+      continue;
+    }
+    return null;
+  }
+  return out;
+}
+
+function positionalForJsonc(node: JsoncValue, segment: string): string | null {
+  if (node.kind === "object") {
+    const keys = node.entries.map((entry) => entry.key);
+    return resolvePositionalSeg(segment, { indexable: false, size: keys.length, keys });
+  }
+  if (node.kind === "array") {
+    return resolvePositionalSeg(segment, { indexable: true, size: node.items.length });
+  }
+  return null;
+}
+
+function jsoncValueToJson(value: JsoncValue): unknown {
+  switch (value.kind) {
+    case "object":
+      return Object.fromEntries(
+        value.entries.map((entry) => [entry.key, jsoncValueToJson(entry.value)]),
+      );
+    case "array":
+      return value.items.map(jsoncValueToJson);
+    case "string":
+      return value.value;
+    case "number":
+      return value.value;
+    case "boolean":
+      return value.value;
+    case "null":
+      return null;
+  }
+  return null;
+}

extensions/oc-path/src/oc-path/jsonc/emit.ts

@@ -0,0 +1,68 @@
+/**
+ * Emit a `JsoncAst` to bytes.
+ *
+ * Round-trip (default) echoes `ast.raw` verbatim — preserves comments
+ * and formatting. Sentinel guard fires only in render mode by default;
+ * round-trip trusts parsed bytes so a workspace file legitimately
+ * containing the sentinel literal isn't a global emit DoS. Callers
+ * that need pre-existing detection opt in via
+ * `acceptPreExistingSentinel: false`.
+ *
+ * @module @openclaw/oc-path/jsonc/emit
+ */
+
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../sentinel.js";
+import type { JsoncAst, JsoncValue } from "./ast.js";
+
+export interface JsoncEmitOptions {
+  readonly mode?: "roundtrip" | "render";
+  readonly fileNameForGuard?: string;
+  readonly acceptPreExistingSentinel?: boolean;
+}
+
+export function emitJsonc(ast: JsoncAst, opts: JsoncEmitOptions = {}): string {
+  const mode = opts.mode ?? "roundtrip";
+  const guardPath = opts.fileNameForGuard ? `oc://${opts.fileNameForGuard}` : "oc://";
+  const acceptPreExisting = opts.acceptPreExistingSentinel ?? true;
+
+  if (mode === "roundtrip") {
+    if (!acceptPreExisting && ast.raw.includes(REDACTED_SENTINEL)) {
+      throw new OcEmitSentinelError(`${guardPath}/[raw]`);
+    }
+    return ast.raw;
+  }
+
+  // Render mode loses comments; walks leaves for caller-injected sentinel.
+  if (ast.root === null) {
+    return "";
+  }
+  return renderValue(ast.root, guardPath, []);
+}
+
+function renderValue(value: JsoncValue, guardPath: string, walked: readonly string[]): string {
+  switch (value.kind) {
+    case "object": {
+      const parts = value.entries.map(
+        (e) => `${JSON.stringify(e.key)}: ${renderValue(e.value, guardPath, [...walked, e.key])}`,
+      );
+      return `{ ${parts.join(", ")} }`;
+    }
+    case "array": {
+      const parts = value.items.map((v, i) => renderValue(v, guardPath, [...walked, String(i)]));
+      return `[ ${parts.join(", ")} ]`;
+    }
+    case "string":
+      // Substring match: embedded sentinel leaks marker bytes too.
+      if (value.value.includes(REDACTED_SENTINEL)) {
+        throw new OcEmitSentinelError(`${guardPath}/${walked.join("/")}`);
+      }
+      return JSON.stringify(value.value);
+    case "number":
+      return String(value.value);
+    case "boolean":
+      return String(value.value);
+    case "null":
+      return "null";
+  }
+  return "";
+}

extensions/oc-path/src/oc-path/jsonc/parse.ts

@@ -0,0 +1,189 @@
+// OC Path module implements parse behavior.
+import { type ParseError, parseTree, printParseErrorCode } from "jsonc-parser/lib/esm/main.js";
+import type { Diagnostic } from "../ast.js";
+import type { JsoncAst, JsoncEntry, JsoncValue } from "./ast.js";
+
+export const MAX_PARSE_DEPTH = 256;
+
+/**
+ * Hard cap on jsonc input size. `parseTree` is iterative and stack-safe
+ * but allocates a tree node per token regardless of depth — a 16 MiB
+ * input expanding to millions of nodes hits memory pressure long before
+ * `nodeToJsoncValue`'s `MAX_PARSE_DEPTH` walk would notice. Cap at the
+ * source level so allocation is bounded by file size, not token count.
+ *
+ * 16 MiB is well past every workspace-jsonc shape we care about
+ * (gateway.jsonc / openclaw.json / .openclaw/* are all <100 KiB in
+ * practice; the largest LKG-tracked configs we've seen sit at single-
+ * digit MB). Operators with legitimate larger inputs can lift the cap
+ * by patching this constant — no SDK affordance because it isn't a
+ * supported configuration.
+ */
+export const MAX_JSONC_INPUT_BYTES = 16 * 1024 * 1024;
+const JSONC_PARSE_INVALID_SYMBOL = 1;
+const JSONC_PARSE_END_OF_FILE_EXPECTED = 9;
+
+export interface JsoncParseResult {
+  readonly ast: JsoncAst;
+  readonly diagnostics: readonly Diagnostic[];
+}
+
+type LineMap = {
+  lineForOffset(offset: number): number;
+};
+
+type JsoncParserNode = {
+  readonly type: "array" | "boolean" | "null" | "number" | "object" | "property" | "string";
+  readonly offset: number;
+  readonly length: number;
+  readonly value?: unknown;
+  readonly children?: readonly JsoncParserNode[];
+};
+
+export function parseJsonc(raw: string): JsoncParseResult {
+  if (raw.trim().length === 0) {
+    return { ast: { kind: "jsonc", raw, root: null }, diagnostics: [] };
+  }
+
+  // Pre-parse byte-length cap. Symmetric with the post-parse depth cap
+  // at `nodeToJsoncValue`. Without this, `parseTree` would allocate the
+  // full tree before our walker noticed; bounding at the source keeps
+  // memory pressure proportional to input size.
+  if (raw.length > MAX_JSONC_INPUT_BYTES) {
+    return {
+      ast: { kind: "jsonc", raw, root: null },
+      diagnostics: [
+        {
+          line: 1,
+          message: `input exceeds MAX_JSONC_INPUT_BYTES (${MAX_JSONC_INPUT_BYTES} bytes; got ${raw.length})`,
+          severity: "error",
+          code: "OC_JSONC_INPUT_TOO_LARGE",
+        },
+      ],
+    };
+  }
+
+  const parseSource = raw.startsWith("\uFEFF") ? raw.slice(1) : raw;
+  const errors: ParseError[] = [];
+  const tree = parseTree(parseSource, errors, {
+    allowTrailingComma: true,
+    disallowComments: false,
+    allowEmptyContent: true,
+  }) as JsoncParserNode | undefined;
+  const lineMap = createLineMap(raw);
+  const diagnostics = errors.map((error) => toDiagnostic(error, lineMap, tree));
+  let root: JsoncValue | null = null;
+  if (tree && diagnostics.every((d) => d.severity !== "error")) {
+    try {
+      root = nodeToJsoncValue(tree, lineMap, 0);
+    } catch (err) {
+      diagnostics.push({
+        line: 1,
+        message: err instanceof Error ? err.message : String(err),
+        severity: "error",
+        code: "OC_JSONC_DEPTH_EXCEEDED",
+      });
+    }
+  }
+
+  return {
+    ast: {
+      kind: "jsonc",
+      raw,
+      root: diagnostics.every((d) => d.severity !== "error") ? root : null,
+    },
+    diagnostics,
+  };
+}
+
+function toDiagnostic(
+  error: ParseError,
+  lineMap: LineMap,
+  tree: JsoncParserNode | undefined,
+): Diagnostic {
+  const treeEnd = tree ? tree.offset + tree.length : 0;
+  const errorCode: number = error.error;
+  const isTrailingInput =
+    errorCode === JSONC_PARSE_END_OF_FILE_EXPECTED ||
+    (tree !== undefined && errorCode === JSONC_PARSE_INVALID_SYMBOL && error.offset >= treeEnd);
+  return {
+    line: lineMap.lineForOffset(error.offset),
+    message: printParseErrorCode(error.error),
+    severity: isTrailingInput ? "warning" : "error",
+    code: isTrailingInput ? "OC_JSONC_TRAILING_INPUT" : "OC_JSONC_PARSE_FAILED",
+  };
+}
+
+function nodeToJsoncValue(node: JsoncParserNode, lineMap: LineMap, depth: number): JsoncValue {
+  if (depth > MAX_PARSE_DEPTH) {
+    throw new Error(`structural depth exceeded MAX_PARSE_DEPTH (${MAX_PARSE_DEPTH})`);
+  }
+  const line = lineMap.lineForOffset(node.offset);
+  switch (node.type) {
+    case "object":
+      return {
+        kind: "object",
+        line,
+        entries: (node.children ?? []).flatMap((child): JsoncEntry[] => {
+          if (child.type !== "property") {
+            return [];
+          }
+          const keyNode = child.children?.[0];
+          const valueNode = child.children?.[1];
+          if (!keyNode || !valueNode) {
+            return [];
+          }
+          return [
+            {
+              key: String(keyNode.value),
+              line: lineMap.lineForOffset(keyNode.offset),
+              value: nodeToJsoncValue(valueNode, lineMap, depth + 1),
+            },
+          ];
+        }),
+      };
+    case "array":
+      return {
+        kind: "array",
+        line,
+        items: (node.children ?? []).map((child) => nodeToJsoncValue(child, lineMap, depth + 1)),
+      };
+    case "string":
+      return { kind: "string", value: String(node.value), line };
+    case "number":
+      return { kind: "number", value: Number(node.value), line };
+    case "boolean":
+      return { kind: "boolean", value: Boolean(node.value), line };
+    case "null":
+      return { kind: "null", line };
+    default:
+      return { kind: "null", line };
+  }
+}
+
+function createLineMap(raw: string): LineMap {
+  const starts = [0];
+  for (let i = 0; i < raw.length; i++) {
+    if (raw[i] === "\n") {
+      starts.push(i + 1);
+    }
+  }
+  return {
+    lineForOffset(offset) {
+      let low = 0;
+      let high = starts.length - 1;
+      while (low <= high) {
+        const mid = Math.floor((low + high) / 2);
+        const start = starts[mid] ?? 0;
+        if (start <= offset) {
+          low = mid + 1;
+        } else {
+          high = mid - 1;
+        }
+      }
+      return Math.max(1, high + 1);
+    },
+  };
+}
+
+export type { Diagnostic };

extensions/oc-path/src/oc-path/jsonc/resolve-value.ts

@@ -0,0 +1,72 @@
+// OC Path module implements resolve value behavior.
+import { isPositionalSeg, parseArrayIndexSegment, resolvePositionalSeg } from "../oc-path.js";
+import type { JsoncEntry, JsoncValue } from "./ast.js";
+
+export type JsoncValueOcPathMatch =
+  | { readonly kind: "value"; readonly node: JsoncValue; readonly path: readonly string[] }
+  | {
+      readonly kind: "object-entry";
+      readonly node: JsoncEntry;
+      readonly path: readonly string[];
+    };
+
+export function resolveJsoncValueOcPath(
+  root: JsoncValue,
+  segments: readonly string[],
+): JsoncValueOcPathMatch | null {
+  let current: JsoncValue = root;
+  let lastEntry: JsoncEntry | null = null;
+  const walked: string[] = [];
+
+  for (let seg of segments) {
+    if (seg.length === 0) {
+      return null;
+    }
+    if (isPositionalSeg(seg)) {
+      const concrete = positionalForJsonc(current, seg);
+      if (concrete !== null) {
+        seg = concrete;
+      }
+    }
+    walked.push(seg);
+    if (current.kind === "object") {
+      const entry = current.entries.find((e) => e.key === seg);
+      if (entry === undefined) {
+        return null;
+      }
+      lastEntry = entry;
+      current = entry.value;
+      continue;
+    }
+    if (current.kind === "array") {
+      const idx = parseArrayIndexSegment(seg, current.items.length);
+      if (idx === null) {
+        return null;
+      }
+      lastEntry = null;
+      const item = current.items[idx];
+      if (item === undefined) {
+        return null;
+      }
+      current = item;
+      continue;
+    }
+    return null;
+  }
+
+  if (lastEntry !== null && current === lastEntry.value) {
+    return { kind: "object-entry", node: lastEntry, path: walked };
+  }
+  return { kind: "value", node: current, path: walked };
+}
+
+function positionalForJsonc(node: JsoncValue, seg: string): string | null {
+  if (node.kind === "object") {
+    const keys = node.entries.map((e) => e.key);
+    return resolvePositionalSeg(seg, { indexable: false, size: keys.length, keys });
+  }
+  if (node.kind === "array") {
+    return resolvePositionalSeg(seg, { indexable: true, size: node.items.length });
+  }
+  return null;
+}

extensions/oc-path/src/oc-path/jsonc/resolve.ts

@@ -0,0 +1,46 @@
+/**
+ * Resolve `OcPath` against `JsoncAst`. Slot segments concat as if
+ * dotted; segments are bracket/quote-aware-split so quoted keys
+ * containing `/` or `.` round-trip cleanly.
+ *
+ * @module @openclaw/oc-path/jsonc/resolve
+ */
+
+import type { OcPath } from "../oc-path.js";
+import { isQuotedSeg, splitRespectingBrackets, unquoteSeg } from "../oc-path.js";
+import type { JsoncAst, JsoncEntry, JsoncValue } from "./ast.js";
+import { resolveJsoncValueOcPath } from "./resolve-value.js";
+
+export type JsoncOcPathMatch =
+  | { readonly kind: "root"; readonly node: JsoncAst }
+  | { readonly kind: "value"; readonly node: JsoncValue; readonly path: readonly string[] }
+  | {
+      readonly kind: "object-entry";
+      readonly node: JsoncEntry;
+      readonly path: readonly string[];
+    };
+
+export function resolveJsoncOcPath(ast: JsoncAst, path: OcPath): JsoncOcPathMatch | null {
+  if (ast.root === null) {
+    return null;
+  }
+
+  const segments: string[] = [];
+  const collect = (slot: string | undefined): void => {
+    if (slot === undefined) {
+      return;
+    }
+    for (const s of splitRespectingBrackets(slot, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  };
+  collect(path.section);
+  collect(path.item);
+  collect(path.field);
+
+  if (segments.length === 0) {
+    return { kind: "root", node: ast };
+  }
+
+  return resolveJsoncValueOcPath(ast.root, segments);
+}

extensions/oc-path/src/oc-path/jsonl/ast.ts

@@ -0,0 +1,49 @@
+/**
+ * JSONL AST types — JSON-Lines: one JSON value per line, separated by
+ * `\n`. The shape used by openclaw session-event logs, audit trails,
+ * and LKG checkpoints (which is why JSONL is part of the universal
+ * OcPath addressing scheme).
+ *
+ * **Per-kind discriminator**: every AST in this substrate carries a
+ * `kind` field. The OcPath resolver dispatches on `kind`.
+ *
+ * **Byte-fidelity**: `raw` is preserved on the root for round-trip
+ * emit. JSONL is line-oriented, so blank lines and per-line comments
+ * (we don't strip them in render mode either — we preserve them as
+ * "raw" line entries) live in the AST.
+ *
+ * @module @openclaw/oc-path/jsonl/ast
+ */
+
+import type { JsoncValue } from "../jsonc/ast.js";
+
+/** The root JSONL AST. `raw` round-trips byte-identical via emit. */
+export interface JsonlAst {
+  readonly kind: "jsonl";
+  readonly raw: string;
+  readonly lines: readonly JsonlLine[];
+  /**
+   * Line-ending convention detected at parse time. Used by render mode
+   * to reconstruct the original convention (Windows-authored datasets
+   * use CRLF; Unix uses LF). Optional for back-compat with synthetic
+   * ASTs that don't track this — render mode falls back to LF when
+   * undefined.
+   */
+  readonly lineEnding?: "\r\n" | "\n";
+}
+
+/**
+ * One line of a JSONL file. Either a parsed JSON value, a blank line
+ * (preserved for round-trip), or a malformed line (emit verbatim;
+ * emit-time sentinel guard still scans).
+ */
+export type JsonlLine =
+  | {
+      readonly kind: "value";
+      readonly line: number;
+      readonly value: JsoncValue;
+      /** The original line text (without trailing newline). */
+      readonly raw: string;
+    }
+  | { readonly kind: "blank"; readonly line: number; readonly raw: string }
+  | { readonly kind: "malformed"; readonly line: number; readonly raw: string };

extensions/oc-path/src/oc-path/jsonl/edit.ts

@@ -0,0 +1,227 @@
+/**
+ * Mutate a `JsonlAst` at an OcPath. Append uses `appendJsonlOcPath`;
+ * `setJsonlOcPath` only edits existing addresses.
+ *
+ * @module @openclaw/oc-path/jsonl/edit
+ */
+
+import type { JsoncEntry, JsoncValue } from "../jsonc/ast.js";
+import type { OcPath } from "../oc-path.js";
+import {
+  isPositionalSeg,
+  isQuotedSeg,
+  parseArrayIndexSegment,
+  resolvePositionalSeg,
+  splitRespectingBrackets,
+  unquoteSeg,
+} from "../oc-path.js";
+import type { JsonlAst, JsonlLine } from "./ast.js";
+import { emitJsonl } from "./emit.js";
+
+export type JsonlEditResult =
+  | { readonly ok: true; readonly ast: JsonlAst }
+  | { readonly ok: false; readonly reason: "unresolved" | "not-a-value-line" };
+
+export function setJsonlOcPath(ast: JsonlAst, path: OcPath, newValue: JsoncValue): JsonlEditResult {
+  const head = path.section;
+  if (head === undefined) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const lineIdx = pickLineIndex(ast, head);
+  if (lineIdx === -1) {
+    return { ok: false, reason: "unresolved" };
+  }
+  const target = ast.lines[lineIdx];
+  if (target === undefined) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  // No item/field — replace the whole line. Requires an existing value line.
+  if (path.item === undefined && path.field === undefined) {
+    if (target.kind !== "value") {
+      return { ok: false, reason: "not-a-value-line" };
+    }
+    const newLine: JsonlLine = {
+      kind: "value",
+      line: target.line,
+      value: newValue,
+      raw: target.raw,
+    };
+    return finalize(ast, lineIdx, newLine, path.file);
+  }
+
+  if (target.kind !== "value") {
+    return { ok: false, reason: "not-a-value-line" };
+  }
+
+  // Quote-aware split keeps edit symmetric with resolveJsonlOcPath.
+  const segments: string[] = [];
+  if (path.item !== undefined) {
+    segments.push(...splitRespectingBrackets(path.item, "."));
+  }
+  if (path.field !== undefined) {
+    segments.push(...splitRespectingBrackets(path.field, "."));
+  }
+
+  const replaced = replaceAt(target.value, segments, 0, newValue);
+  if (replaced === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+  const newLine: JsonlLine = {
+    kind: "value",
+    line: target.line,
+    value: replaced,
+    raw: target.raw,
+  };
+  return finalize(ast, lineIdx, newLine, path.file);
+}
+
+function replaceAt(
+  current: JsoncValue,
+  segments: readonly string[],
+  i: number,
+  newValue: JsoncValue,
+): JsoncValue | null {
+  const seg = segments[i];
+  if (seg === undefined) {
+    return newValue;
+  }
+  if (seg.length === 0) {
+    return null;
+  }
+
+  if (current.kind === "object") {
+    // Positional tokens resolve against the entries' ordered key list;
+    // quoted segments are unquoted before literal-key comparison.
+    let segNorm = seg;
+    if (isPositionalSeg(seg)) {
+      const resolved = resolvePositionalSeg(seg, {
+        indexable: false,
+        size: current.entries.length,
+        keys: current.entries.map((e) => e.key),
+      });
+      if (resolved === null) {
+        return null;
+      }
+      segNorm = resolved;
+    }
+    const lookupKey = isQuotedSeg(segNorm) ? unquoteSeg(segNorm) : segNorm;
+    const idx = current.entries.findIndex((e) => e.key === lookupKey);
+    if (idx === -1) {
+      return null;
+    }
+    const child = current.entries[idx];
+    if (child === undefined) {
+      return null;
+    }
+    const replacedChild = replaceAt(child.value, segments, i + 1, newValue);
+    if (replacedChild === null) {
+      return null;
+    }
+    const newEntry: JsoncEntry = { ...child, value: replacedChild };
+    const newEntries = current.entries.slice();
+    newEntries[idx] = newEntry;
+    return {
+      kind: "object",
+      entries: newEntries,
+      ...(current.line !== undefined ? { line: current.line } : {}),
+    };
+  }
+
+  if (current.kind === "array") {
+    let segNorm = seg;
+    if (isPositionalSeg(seg)) {
+      const resolved = resolvePositionalSeg(seg, {
+        indexable: true,
+        size: current.items.length,
+      });
+      if (resolved === null) {
+        return null;
+      }
+      segNorm = resolved;
+    }
+    const idx = parseArrayIndexSegment(segNorm, current.items.length);
+    if (idx === null) {
+      return null;
+    }
+    const child = current.items[idx];
+    if (child === undefined) {
+      return null;
+    }
+    const replacedChild = replaceAt(child, segments, i + 1, newValue);
+    if (replacedChild === null) {
+      return null;
+    }
+    const newItems = current.items.slice();
+    newItems[idx] = replacedChild;
+    return {
+      kind: "array",
+      items: newItems,
+      ...(current.line !== undefined ? { line: current.line } : {}),
+    };
+  }
+
+  return null;
+}
+
+function pickLineIndex(ast: JsonlAst, addr: string): number {
+  if (addr === "$first") {
+    return ast.lines.findIndex((line) => line.kind === "value");
+  }
+  if (addr === "$last") {
+    for (let i = ast.lines.length - 1; i >= 0; i--) {
+      if (ast.lines[i]?.kind === "value") {
+        return i;
+      }
+    }
+    return -1;
+  }
+  const m = /^L(\d+)$/.exec(addr);
+  if (m === null || m[1] === undefined) {
+    return -1;
+  }
+  const target = Number(m[1]);
+  return ast.lines.findIndex((l) => l.line === target);
+}
+
+function finalize(
+  ast: JsonlAst,
+  lineIdx: number,
+  newLine: JsonlLine,
+  fileName?: string,
+): JsonlEditResult {
+  const newLines = ast.lines.slice();
+  newLines[lineIdx] = newLine;
+  const next: JsonlAst = {
+    kind: "jsonl",
+    raw: "",
+    lines: newLines,
+    ...(ast.lineEnding !== undefined ? { lineEnding: ast.lineEnding } : {}),
+  };
+  const opts =
+    fileName !== undefined
+      ? { mode: "render" as const, fileNameForGuard: fileName }
+      : { mode: "render" as const };
+  const rendered = emitJsonl(next, opts);
+  return { ok: true, ast: { ...next, raw: rendered } };
+}
+
+/** Append a value as the next line. Line numbers are substrate-assigned. */
+export function appendJsonlOcPath(ast: JsonlAst, value: JsoncValue): JsonlAst {
+  const nextLineNo = ast.lines.length === 0 ? 1 : (ast.lines[ast.lines.length - 1]?.line ?? 0) + 1;
+  const newLine: JsonlLine = {
+    kind: "value",
+    line: nextLineNo,
+    value,
+    raw: "",
+  };
+  const next: JsonlAst = {
+    kind: "jsonl",
+    raw: "",
+    lines: [...ast.lines, newLine],
+    ...(ast.lineEnding !== undefined ? { lineEnding: ast.lineEnding } : {}),
+  };
+  const rendered = emitJsonl(next, { mode: "render" });
+  return { ...next, raw: rendered };
+}

extensions/oc-path/src/oc-path/jsonl/emit.ts

@@ -0,0 +1,73 @@
+/**
+ * Emit a `JsonlAst` to bytes. Round-trip echoes `ast.raw`; render mode
+ * rebuilds from line entries (preserves blank/malformed lines verbatim).
+ *
+ * @module @openclaw/oc-path/jsonl/emit
+ */
+
+import type { JsoncValue } from "../jsonc/ast.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../sentinel.js";
+import type { JsonlAst } from "./ast.js";
+
+export interface JsonlEmitOptions {
+  readonly mode?: "roundtrip" | "render";
+  readonly fileNameForGuard?: string;
+  readonly acceptPreExistingSentinel?: boolean;
+}
+
+export function emitJsonl(ast: JsonlAst, opts: JsonlEmitOptions = {}): string {
+  const mode = opts.mode ?? "roundtrip";
+  const guardPath = opts.fileNameForGuard ? `oc://${opts.fileNameForGuard}` : "oc://";
+  const acceptPreExisting = opts.acceptPreExistingSentinel ?? true;
+
+  if (mode === "roundtrip") {
+    if (!acceptPreExisting && ast.raw.includes(REDACTED_SENTINEL)) {
+      throw new OcEmitSentinelError(`${guardPath}/[raw]`);
+    }
+    return ast.raw;
+  }
+
+  const out: string[] = [];
+  for (const ln of ast.lines) {
+    if (ln.kind === "blank" || ln.kind === "malformed") {
+      if (!acceptPreExisting && ln.raw.includes(REDACTED_SENTINEL)) {
+        throw new OcEmitSentinelError(`${guardPath}/L${ln.line}`);
+      }
+      out.push(ln.raw);
+      continue;
+    }
+    // Value lines always scan leaves so caller-injected sentinel is rejected.
+    out.push(renderValue(ln.value, `${guardPath}/L${ln.line}`, []));
+  }
+  // Preserve line-ending convention; otherwise CRLF input edited via
+  // setJsonlOcPath would emit mixed endings (silent corruption on Windows).
+  return out.join(ast.lineEnding ?? "\n");
+}
+
+function renderValue(value: JsoncValue, guardPath: string, walked: readonly string[]): string {
+  switch (value.kind) {
+    case "object": {
+      const parts = value.entries.map(
+        (e) => `${JSON.stringify(e.key)}:${renderValue(e.value, guardPath, [...walked, e.key])}`,
+      );
+      return `{${parts.join(",")}}`;
+    }
+    case "array": {
+      const parts = value.items.map((v, i) => renderValue(v, guardPath, [...walked, String(i)]));
+      return `[${parts.join(",")}]`;
+    }
+    case "string":
+      // Substring match: embedded sentinel leaks marker bytes too.
+      if (value.value.includes(REDACTED_SENTINEL)) {
+        throw new OcEmitSentinelError(`${guardPath}/${walked.join("/")}`);
+      }
+      return JSON.stringify(value.value);
+    case "number":
+      return String(value.value);
+    case "boolean":
+      return String(value.value);
+    case "null":
+      return "null";
+  }
+  return "";
+}

extensions/oc-path/src/oc-path/jsonl/line.ts

@@ -0,0 +1,33 @@
+import { POS_FIRST, POS_LAST } from "../oc-path.js";
+import type { JsonlAst, JsonlLine } from "./ast.js";
+
+export function pickJsonlLine(ast: JsonlAst, addr: string): JsonlLine | null {
+  if (addr === POS_FIRST) {
+    for (const line of ast.lines) {
+      if (line.kind === "value") {
+        return line;
+      }
+    }
+    return null;
+  }
+  if (addr === POS_LAST) {
+    for (let index = ast.lines.length - 1; index >= 0; index -= 1) {
+      const line = ast.lines[index];
+      if (line !== undefined && line.kind === "value") {
+        return line;
+      }
+    }
+    return null;
+  }
+  const match = /^L(\d+)$/.exec(addr);
+  if (match === null || match[1] === undefined) {
+    return null;
+  }
+  const target = Number(match[1]);
+  for (const line of ast.lines) {
+    if (line.line === target) {
+      return line;
+    }
+  }
+  return null;
+}

extensions/oc-path/src/oc-path/jsonl/parse.ts

@@ -0,0 +1,73 @@
+/**
+ * JSONL parser — splits on `\n`, parses each non-empty line as JSONC
+ * (allowing comments/trailing-comma is harmless and matches what
+ * openclaw session logs actually emit). Soft-error policy: malformed
+ * lines surface as `kind: 'malformed'` AST entries plus a diagnostic.
+ *
+ * @module @openclaw/oc-path/jsonl/parse
+ */
+
+import type { Diagnostic } from "../ast.js";
+import { parseJsonc } from "../jsonc/parse.js";
+import type { JsonlAst, JsonlLine } from "./ast.js";
+
+export interface JsonlParseResult {
+  readonly ast: JsonlAst;
+  readonly diagnostics: readonly Diagnostic[];
+}
+
+export function parseJsonl(raw: string): JsonlParseResult {
+  const diagnostics: Diagnostic[] = [];
+  // Detect the line-ending convention from the input. Windows-authored
+  // datasets use CRLF; Unix and most cross-platform tooling use LF. We
+  // count CRLF occurrences and call CRLF if the majority of newlines
+  // are CRLF — this handles mixed-ending files (e.g., a Unix log
+  // edited once on Windows) by picking the dominant convention.
+  // Without this, `setJsonlOcPath` rebuilds a CRLF input via render
+  // mode which joins with `\n`, producing mixed endings on a
+  // previously-CRLF file.
+  const crlfCount = (raw.match(/\r\n/g) ?? []).length;
+  const lfCount = (raw.match(/\n/g) ?? []).length;
+  const lineEnding: "\r\n" | "\n" = crlfCount > 0 && crlfCount * 2 >= lfCount ? "\r\n" : "\n";
+
+  // Trim trailing newline so we don't fabricate a blank line at EOF
+  // for files that end with `\n` (which is most of them).
+  let body = raw.endsWith("\r\n") ? raw.slice(0, -2) : raw.endsWith("\n") ? raw.slice(0, -1) : raw;
+  // Normalize line endings to LF for consistent splitting; per-line
+  // `raw` is stored without the trailing `\r`, and render mode
+  // restores the original convention via `lineEnding`.
+  body = body.replace(/\r\n/g, "\n");
+  const lines: JsonlLine[] = [];
+
+  if (body.length === 0) {
+    return { ast: { kind: "jsonl", raw, lines, lineEnding }, diagnostics };
+  }
+
+  const parts = body.split("\n");
+  parts.forEach((lineText, idx) => {
+    const lineNo = idx + 1;
+    if (lineText.trim().length === 0) {
+      lines.push({ kind: "blank", line: lineNo, raw: lineText });
+      return;
+    }
+    const r = parseJsonc(lineText);
+    if (r.ast.root === null) {
+      lines.push({ kind: "malformed", line: lineNo, raw: lineText });
+      diagnostics.push({
+        line: lineNo,
+        message: `line ${lineNo} could not be parsed as JSON`,
+        severity: "warning",
+        code: "OC_JSONL_LINE_MALFORMED",
+      });
+      return;
+    }
+    lines.push({
+      kind: "value",
+      line: lineNo,
+      value: r.ast.root,
+      raw: lineText,
+    });
+  });
+
+  return { ast: { kind: "jsonl", raw, lines, lineEnding }, diagnostics };
+}

extensions/oc-path/src/oc-path/jsonl/resolve.ts

@@ -0,0 +1,87 @@
+/**
+ * Resolve an `OcPath` against a `JsonlAst`.
+ *
+ * Convention for JSONL OcPaths:
+ *
+ *   oc://session-events/L42                  → entire line 42 value
+ *   oc://session-events/L42/result           → field on line 42's value
+ *   oc://session-events/L42/result.detail    → dotted descent
+ *   oc://session-events/$last                → final non-blank value
+ *
+ * `Lnnn` (line address) and `$last` are the addressing primitives
+ * unique to JSONL — they're how forensics / replay refers to a
+ * specific entry without committing to a content key.
+ *
+ * @module @openclaw/oc-path/jsonl/resolve
+ */
+
+import type { JsoncEntry, JsoncValue } from "../jsonc/ast.js";
+import { resolveJsoncValueOcPath } from "../jsonc/resolve-value.js";
+import type { OcPath } from "../oc-path.js";
+import { isQuotedSeg, splitRespectingBrackets, unquoteSeg } from "../oc-path.js";
+import type { JsonlAst, JsonlLine } from "./ast.js";
+import { pickJsonlLine } from "./line.js";
+
+export type JsonlOcPathMatch =
+  | { readonly kind: "root"; readonly node: JsonlAst }
+  | { readonly kind: "line"; readonly node: JsonlLine }
+  | {
+      readonly kind: "value";
+      readonly node: JsoncValue;
+      readonly line: number;
+      readonly path: readonly string[];
+    }
+  | {
+      readonly kind: "object-entry";
+      readonly node: JsoncEntry;
+      readonly line: number;
+      readonly path: readonly string[];
+    };
+
+export function resolveJsonlOcPath(ast: JsonlAst, path: OcPath): JsonlOcPathMatch | null {
+  // The first non-file segment is the line address (Lnnn or $last).
+  const head = path.section;
+  if (head === undefined) {
+    return { kind: "root", node: ast };
+  }
+
+  const lineEntry = pickJsonlLine(ast, head);
+  if (lineEntry === null) {
+    return null;
+  }
+
+  // No further descent — return the line entry itself.
+  if (path.item === undefined && path.field === undefined) {
+    return { kind: "line", node: lineEntry };
+  }
+
+  if (lineEntry.kind !== "value") {
+    return null;
+  }
+
+  const segments: string[] = [];
+  if (path.item !== undefined) {
+    for (const s of splitRespectingBrackets(path.item, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  }
+  if (path.field !== undefined) {
+    for (const s of splitRespectingBrackets(path.field, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  }
+
+  const match = resolveJsoncValueOcPath(lineEntry.value, segments);
+  if (match === null) {
+    return null;
+  }
+  if (match.kind === "object-entry") {
+    return {
+      kind: "object-entry",
+      node: match.node,
+      line: lineEntry.line,
+      path: match.path,
+    };
+  }
+  return { kind: "value", node: match.node, line: lineEntry.line, path: match.path };
+}

extensions/oc-path/src/oc-path/oc-path.ts

@@ -0,0 +1,820 @@
+/**
+ * `oc://` path syntax — universal addressing for the OpenClaw workspace.
+ *
+ *     oc://{file}[/{section}[/{item}[/{field}]]][?session={id}]
+ *
+ * Canonical round-trip contract: `formatOcPath(parseOcPath(s)) === s`
+ * for canonical paths. Extra query parameters are ignored except for
+ * the first non-empty `session=` value.
+ *
+ * @module @openclaw/oc-path/oc-path
+ */
+
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "./sentinel.js";
+
+const OC_SCHEME = "oc://";
+
+// Hard caps bound resource use under pathological / hostile input.
+export const MAX_PATH_LENGTH = 4096;
+export const MAX_SUB_SEGMENTS_PER_SLOT = 64;
+export const MAX_TRAVERSAL_DEPTH = 256;
+
+const BOM = "";
+
+// Walk by char code rather than regex — the no-control-regex lint rule
+// rejects character classes covering U+0000–U+001F + U+007F.
+function hasControlChar(s: string): boolean {
+  for (let i = 0; i < s.length; i++) {
+    const cc = s.charCodeAt(i);
+    if (cc <= 0x1f || cc === 0x7f) {
+      return true;
+    }
+  }
+  return false;
+}
+
+const RESERVED_CHARS_RE = /[?&%]/;
+
+/** Render with `\xNN` escapes so error output is readable for invisible chars. */
+function printable(s: string): string {
+  let out = "";
+  for (let i = 0; i < s.length; i++) {
+    const cc = s.charCodeAt(i);
+    if (cc <= 0x1f || cc === 0x7f) {
+      out += `\\x${cc.toString(16).padStart(2, "0")}`;
+    } else {
+      out += s[i];
+    }
+  }
+  return out;
+}
+
+/**
+ * Parsed `oc://` path. Components nest strictly: `item` implies
+ * `section`, `field` implies `item`. `field` directly under file
+ * addresses a frontmatter key; under item it addresses the value of a
+ * `- key: value` bullet. `session` is an opaque raw scope string; it is
+ * not percent-decoded and cannot contain control characters or reserved
+ * query delimiters (`?`, `&`, `%`).
+ */
+export interface OcPath {
+  readonly file: string;
+  readonly section?: string;
+  readonly item?: string;
+  readonly field?: string;
+  readonly session?: string;
+}
+
+/** `code` is the stable machine-readable tag; consumers match on `code`, not `message`. */
+export class OcPathError extends Error {
+  readonly code: string;
+  readonly input: string;
+
+  constructor(message: string, input: string, code: string) {
+    super(message);
+    this.name = "OcPathError";
+    this.input = input;
+    this.code = code;
+  }
+}
+
+function fail(message: string, input: string, code: string): never {
+  throw new OcPathError(message, input, code);
+}
+
+// Reject absolute paths, parent-dir escapes, and control chars at every
+// entry point so a hostile struct can't smuggle a filesystem traversal.
+function validateFileSlot(file: string, contextInput: string): void {
+  if (file.startsWith("/") || file.startsWith("\\") || /^[a-zA-Z]:/.test(file)) {
+    fail(
+      `Absolute file slot not allowed (oc:// paths are workspace-relative): ${printable(contextInput)}`,
+      contextInput,
+      "OC_PATH_ABSOLUTE_FILE",
+    );
+  }
+  if (file.split(/[\\/]/).some((seg) => seg === "..")) {
+    fail(
+      `Parent-directory segment ('..') not allowed in oc:// file slot: ${printable(contextInput)}`,
+      contextInput,
+      "OC_PATH_PARENT_TRAVERSAL",
+    );
+  }
+  if (hasControlChar(file)) {
+    fail(
+      `Control character in oc:// file slot: ${printable(contextInput)}`,
+      contextInput,
+      "OC_PATH_CONTROL_CHAR",
+    );
+  }
+}
+
+function validateSessionSlot(session: string, contextInput: string): void {
+  if (hasControlChar(session)) {
+    fail(
+      `Control character in oc:// session query: ${printable(contextInput)}`,
+      contextInput,
+      "OC_PATH_CONTROL_CHAR",
+    );
+  }
+  if (RESERVED_CHARS_RE.test(session)) {
+    fail(
+      `Reserved character (\`?\` / \`&\` / \`%\`) in oc:// session query: ${printable(contextInput)}`,
+      contextInput,
+      "OC_PATH_RESERVED_CHAR",
+    );
+  }
+}
+
+/** Parse an `oc://` path string into a structured `OcPath`. */
+export function parseOcPath(input: string): OcPath {
+  if (typeof input !== "string") {
+    fail("oc:// path must be a string", String(input), "OC_PATH_NOT_STRING");
+  }
+
+  if (input.length > MAX_PATH_LENGTH) {
+    fail(
+      `oc:// path exceeds ${MAX_PATH_LENGTH} bytes (length: ${input.length})`,
+      input.slice(0, 80) + "…",
+      "OC_PATH_TOO_LONG",
+    );
+  }
+
+  // NFC normalization keeps cross-platform equality (macOS HFS+ NFD vs
+  // Unix/Windows NFC). NFC can grow the string, so re-check the cap.
+  let normalized = input.startsWith(BOM) ? input.slice(BOM.length) : input;
+  normalized = normalized.normalize("NFC");
+
+  if (normalized.length > MAX_PATH_LENGTH) {
+    fail(
+      `oc:// path exceeds ${MAX_PATH_LENGTH} bytes after NFC (length: ${normalized.length})`,
+      input.slice(0, 80) + "…",
+      "OC_PATH_TOO_LONG",
+    );
+  }
+  if (!normalized.startsWith(OC_SCHEME)) {
+    fail(`Missing oc:// scheme: ${printable(input)}`, input, "OC_PATH_MISSING_SCHEME");
+  }
+  if (hasControlChar(normalized)) {
+    fail(`Control character in oc:// path: ${printable(input)}`, input, "OC_PATH_CONTROL_CHAR");
+  }
+
+  const afterScheme = normalized.slice(OC_SCHEME.length);
+  // Top-level split skips quoted keys so `"foo?bar"` isn't broken.
+  const queryIndex = indexOfTopLevel(afterScheme, "?");
+  const pathPart = queryIndex === -1 ? afterScheme : afterScheme.slice(0, queryIndex);
+  const queryPart = queryIndex === -1 ? "" : afterScheme.slice(queryIndex + 1);
+
+  if (pathPart.length === 0) {
+    fail(`Empty oc:// path: ${printable(input)}`, input, "OC_PATH_EMPTY");
+  }
+
+  const rawSegments = splitRespectingBrackets(pathPart, "/", input);
+  for (const seg of rawSegments) {
+    if (seg.length === 0) {
+      fail(`Empty segment in oc:// path: ${printable(input)}`, input, "OC_PATH_EMPTY_SEGMENT");
+    }
+  }
+  const fileSeg = rawSegments[0];
+  const file = isQuotedSeg(fileSeg) ? unquoteSeg(fileSeg) : fileSeg;
+  validateFileSlot(file, input);
+
+  const segments = normalizeDeepJsonPathSegments(rawSegments, file, input);
+  if (segments.length > 4) {
+    fail(`Too many segments in oc:// path (max 4): ${printable(input)}`, input, "OC_PATH_TOO_DEEP");
+  }
+
+  for (const seg of segments) {
+    validateBrackets(seg, input);
+    const subs = splitRespectingBrackets(seg, ".", input);
+    if (subs.length > MAX_SUB_SEGMENTS_PER_SLOT) {
+      fail(
+        `Sub-segment count exceeds ${MAX_SUB_SEGMENTS_PER_SLOT} in segment "${seg}": ${printable(input)}`,
+        input,
+        "OC_PATH_TOO_DEEP",
+      );
+    }
+    for (const sub of subs) {
+      validateSubSegment(sub, input);
+    }
+  }
+
+  const session = extractSession(queryPart, input);
+  return {
+    file,
+    ...(segments[1] !== undefined ? { section: segments[1] } : {}),
+    ...(segments[2] !== undefined ? { item: segments[2] } : {}),
+    ...(segments[3] !== undefined ? { field: segments[3] } : {}),
+    ...(session !== undefined ? { session } : {}),
+  };
+}
+
+function isJsonPathFile(file: string): boolean {
+  const lower = file.toLowerCase();
+  return lower.endsWith(".json") || lower.endsWith(".jsonc");
+}
+
+function normalizeDeepJsonPathSegments(
+  segments: readonly string[],
+  file: string,
+  input: string,
+): readonly string[] {
+  if (segments.length <= 4 || !isJsonPathFile(file)) {
+    return segments;
+  }
+  const pathSegments = segments.slice(1);
+  if (pathSegments.length > MAX_TRAVERSAL_DEPTH) {
+    fail(
+      `JSON oc:// path exceeds ${MAX_TRAVERSAL_DEPTH} nested segments: ${printable(input)}`,
+      input,
+      "OC_PATH_TOO_DEEP",
+    );
+  }
+  const section = pathSegments.slice(0, -2).join(".");
+  const item = pathSegments[pathSegments.length - 2];
+  const field = pathSegments[pathSegments.length - 1];
+  return [segments[0], section, item, field];
+}
+
+/** Format an `OcPath` struct into its canonical string form. */
+export function formatOcPath(path: OcPath): string {
+  if (!path.file || path.file.length === 0) {
+    fail("oc:// path requires a file", "", "OC_PATH_FILE_REQUIRED");
+  }
+  validateFileSlot(path.file, path.file);
+  if (path.item !== undefined && path.section === undefined) {
+    fail("Structural nesting violation: item requires section", path.file, "OC_PATH_NESTING");
+  }
+  if (path.field !== undefined && path.item === undefined) {
+    fail("Structural nesting violation: field requires item", path.file, "OC_PATH_NESTING");
+  }
+
+  // Round-trip requires raw sub-segments to be quoted before
+  // concatenation, OR passed through if already in structural form
+  // (quoted, predicate, union, sentinel). Plain concatenation would
+  // silently split a raw `foo/bar` slot into two segments at parse.
+  const formatSubSegment = (sub: string): string => {
+    if (isQuotedSeg(sub)) {
+      return sub;
+    }
+    if (sub.startsWith("[") && sub.endsWith("]")) {
+      return sub;
+    }
+    if (sub.startsWith("{") && sub.endsWith("}")) {
+      return sub;
+    }
+    return quoteSeg(sub);
+  };
+  const validateSubForFormat = (sub: string, slotName: string): void => {
+    if (sub.length === 0) {
+      fail(
+        `Empty dotted sub-segment in OcPath.${slotName}`,
+        path.file,
+        "OC_PATH_EMPTY_SUB_SEGMENT",
+      );
+    }
+    if (hasControlChar(sub)) {
+      fail(
+        `Control character in OcPath.${slotName} sub-segment "${printable(sub)}"`,
+        path.file,
+        "OC_PATH_CONTROL_CHAR",
+      );
+    }
+  };
+  const formatSlot = (slot: string, slotName: string): string => {
+    const subs = splitRespectingBrackets(slot, ".");
+    for (const sub of subs) {
+      validateSubForFormat(sub, slotName);
+    }
+    return subs.map(formatSubSegment).join(".");
+  };
+
+  // File slot uses lighter quoting than section/item/field: dots are
+  // normal in filenames (`AGENTS.md`); only quote when the file
+  // contains chars that would parse as structure (primarily `/`).
+  const fileNeedsQuote = /[/[\]{}?&%"\s]/.test(path.file);
+  const formattedFile = fileNeedsQuote ? quoteSeg(path.file) : path.file;
+  let out = OC_SCHEME + formattedFile;
+  if (path.section !== undefined) {
+    out += "/" + formatSlot(path.section, "section");
+  }
+  if (path.item !== undefined) {
+    out += "/" + formatSlot(path.item, "item");
+  }
+  if (path.field !== undefined) {
+    out += "/" + formatSlot(path.field, "field");
+  }
+  if (path.session !== undefined) {
+    validateSessionSlot(path.session, path.file);
+    out += "?session=" + path.session;
+  }
+
+  if (out.length > MAX_PATH_LENGTH) {
+    fail(
+      `Formatted oc:// exceeds ${MAX_PATH_LENGTH} bytes (length: ${out.length})`,
+      out.slice(0, 80) + "…",
+      "OC_PATH_TOO_LONG",
+    );
+  }
+  // Path strings flow into telemetry / audit / error messages — refuse
+  // the redaction sentinel here so it can't slip past consumers.
+  if (out.includes(REDACTED_SENTINEL)) {
+    throw new OcEmitSentinelError(out);
+  }
+  return out;
+}
+
+/** True iff `input` is a string `parseOcPath` would accept. */
+export function isValidOcPath(input: unknown): input is string {
+  if (typeof input !== "string") {
+    return false;
+  }
+  try {
+    parseOcPath(input);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Positional tokens: `$first` / `$last` resolve to the first / last
+ * index or declared key. They pick exactly one element, so they don't
+ * trigger wildcard guards.
+ */
+export const POS_FIRST = "$first";
+export const POS_LAST = "$last";
+
+export function isPositionalSeg(seg: string): boolean {
+  return seg === POS_FIRST || seg === POS_LAST;
+}
+
+/**
+ * Ordinal addressing — `#N` targets the Nth item by document order.
+ * Earns its keep on slug-addressed kinds (md items can share a slug
+ * via `- foo: a` / `- foo: b`); `#0`/`#1` distinguish them.
+ */
+export function isOrdinalSeg(seg: string): boolean {
+  return /^#\d+$/.test(seg);
+}
+
+export function parseOrdinalSeg(seg: string): number | null {
+  const m = /^#(\d+)$/.exec(seg);
+  return m === null || m[1] === undefined ? null : Number(m[1]);
+}
+
+export function parseArrayIndexSegment(seg: string, length: number): number | null {
+  if (!/^(0|[1-9]\d*)$/.test(seg)) {
+    return null;
+  }
+  const index = Number(seg);
+  return Number.isSafeInteger(index) && index >= 0 && index < length ? index : null;
+}
+
+/** Indexable containers provide `size`; keyed containers provide ordered `keys`. */
+export interface PositionalContainer {
+  readonly indexable: boolean;
+  readonly size: number;
+  readonly keys?: readonly string[];
+}
+
+// Resolve `$first` / `$last` against a container; null when empty.
+export function resolvePositionalSeg(seg: string, container: PositionalContainer): string | null {
+  if (container.size === 0) {
+    return null;
+  }
+  if (seg === POS_FIRST) {
+    if (!container.indexable) {
+      return container.keys?.[0] ?? null;
+    }
+    return "0";
+  }
+  if (seg === POS_LAST) {
+    if (!container.indexable) {
+      return container.keys?.[container.keys.length - 1] ?? null;
+    }
+    return String(container.size - 1);
+  }
+  return null;
+}
+
+/**
+ * Wildcard tokens permitted in `findOcPaths` patterns.
+ * `*` matches one sub-segment; `**` matches zero or more (recursive).
+ * Reject in resolve/set via `hasWildcard`.
+ */
+export const WILDCARD_SINGLE = "*";
+export const WILDCARD_RECURSIVE = "**";
+
+/**
+ * True iff any sub-segment is a multi-match pattern (`*`, `**`,
+ * union `{a,b,c}`, or predicate `[k=v]`). Single-match verbs reject
+ * these; only `findOcPaths` consumes them.
+ */
+export function isPattern(path: OcPath): boolean {
+  for (const slot of [path.section, path.item, path.field]) {
+    if (slot === undefined) {
+      continue;
+    }
+    // Quote-aware split — `slot.split('.')` would shred quoted keys
+    // containing literal `*` and falsely flag them as wildcards.
+    for (const sub of splitRespectingBrackets(slot, ".")) {
+      if (sub === WILDCARD_SINGLE || sub === WILDCARD_RECURSIVE) {
+        return true;
+      }
+      if (isUnionSeg(sub)) {
+        return true;
+      }
+      if (isPredicateSeg(sub)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+/** @deprecated v1 — use {@link isPattern}. Behaviorally identical. */
+export const hasWildcard = isPattern;
+
+/** Union segment `{a,b,c}` matches each comma-separated alternative. */
+export function isUnionSeg(seg: string): boolean {
+  return seg.length >= 2 && seg.startsWith("{") && seg.endsWith("}");
+}
+
+export function parseUnionSeg(seg: string): readonly string[] | null {
+  if (!isUnionSeg(seg)) {
+    return null;
+  }
+  const inner = seg.slice(1, -1);
+  if (inner.length === 0) {
+    return null;
+  }
+  const alts = inner.split(",");
+  if (alts.some((a) => a.length === 0)) {
+    return null;
+  }
+  return alts;
+}
+
+/**
+ * Value predicate `[key<op>value]`. Operators: `=` `!=` (string),
+ * `<` `<=` `>` `>=` (numeric). Multi-char tried before single-char.
+ */
+export type PredicateOp = "=" | "!=" | "<" | "<=" | ">" | ">=";
+
+const PREDICATE_OPS: readonly PredicateOp[] = ["!=", "<=", ">=", "<", ">", "="];
+
+export function isPredicateSeg(seg: string): boolean {
+  if (seg.length < 4 || !seg.startsWith("[") || !seg.endsWith("]")) {
+    return false;
+  }
+  const inner = new Set(seg.slice(1, -1));
+  return PREDICATE_OPS.some((op) => inner.has(op));
+}
+
+export interface PredicateSpec {
+  readonly key: string;
+  readonly op: PredicateOp;
+  readonly value: string;
+}
+
+export function parsePredicateSeg(seg: string): PredicateSpec | null {
+  if (seg.length < 4 || !seg.startsWith("[") || !seg.endsWith("]")) {
+    return null;
+  }
+  const inner = seg.slice(1, -1);
+  // Leftmost operator wins; at each position, multi-char beats single
+  // (so `[a<=b]` parses as op=`<=`, not op=`<`).
+  for (let i = 1; i < inner.length; i++) {
+    for (const op of PREDICATE_OPS) {
+      if (!inner.startsWith(op, i)) {
+        continue;
+      }
+      if (i + op.length >= inner.length) {
+        continue;
+      } // empty value
+      return { key: inner.slice(0, i), op, value: inner.slice(i + op.length) };
+    }
+  }
+  return null;
+}
+
+// Numeric ops require both sides to coerce to finite numbers.
+export function evaluatePredicate(actual: string | null, pred: PredicateSpec): boolean {
+  if (actual === null) {
+    return false;
+  }
+  switch (pred.op) {
+    case "=":
+      return actual === pred.value;
+    case "!=":
+      return actual !== pred.value;
+    case "<":
+    case "<=":
+    case ">":
+    case ">=": {
+      const a = Number(actual);
+      const b = Number(pred.value);
+      if (!Number.isFinite(a) || !Number.isFinite(b)) {
+        return false;
+      }
+      if (pred.op === "<") {
+        return a < b;
+      }
+      if (pred.op === "<=") {
+        return a <= b;
+      }
+      if (pred.op === ">") {
+        return a > b;
+      }
+      return a >= b;
+    }
+  }
+  return false;
+}
+
+/**
+ * Flatten the path into a concrete sub-segment list plus slot offsets,
+ * so a caller can reconstruct an `OcPath` from a concrete walk by
+ * re-packing sub-segments back into their original slots.
+ */
+export interface PathSegmentLayout {
+  readonly subs: readonly string[];
+  readonly sectionLen: number;
+  readonly itemLen: number;
+  readonly fieldLen: number;
+}
+
+export function getPathLayout(path: OcPath): PathSegmentLayout {
+  // Quote-aware split — `.split('.')` would shred a quoted segment
+  // containing a literal `.` (e.g. `"a.b"`).
+  const sectionSubs = path.section === undefined ? [] : splitRespectingBrackets(path.section, ".");
+  const itemSubs = path.item === undefined ? [] : splitRespectingBrackets(path.item, ".");
+  const fieldSubs = path.field === undefined ? [] : splitRespectingBrackets(path.field, ".");
+  return {
+    subs: [...sectionSubs, ...itemSubs, ...fieldSubs],
+    sectionLen: sectionSubs.length,
+    itemLen: itemSubs.length,
+    fieldLen: fieldSubs.length,
+  };
+}
+
+function extractSession(queryPart: string, input: string): string | undefined {
+  if (queryPart.length === 0) {
+    return undefined;
+  }
+  for (const pair of queryPart.split("&")) {
+    const eqIndex = pair.indexOf("=");
+    if (eqIndex === -1) {
+      continue;
+    }
+    const key = pair.slice(0, eqIndex);
+    const value = pair.slice(eqIndex + 1);
+    if (key === "session" && value.length > 0) {
+      validateSessionSlot(value, input);
+      return value;
+    }
+  }
+  return undefined;
+}
+
+// Walk `s` respecting `[...]`/`{...}`/`"..."` regions. Quoted regions
+// are byte-literal. `onChar` returns "stop" to short-circuit;
+// `onUnbalanced` (must throw) fires on bracket/brace/quote imbalance.
+type ScanCallback = (c: string, i: number, atTop: boolean) => "stop" | void;
+function scanBracketAware(s: string, onChar: ScanCallback, onUnbalanced: () => never): void {
+  let depthBracket = 0;
+  let depthBrace = 0;
+  let inQuote = false;
+  for (let i = 0; i < s.length; i++) {
+    const c = s[i];
+    if (inQuote) {
+      if (c === '"') {
+        inQuote = false;
+      }
+      if (onChar(c, i, false) === "stop") {
+        return;
+      }
+      continue;
+    }
+    if (c === '"') {
+      inQuote = true;
+      if (onChar(c, i, false) === "stop") {
+        return;
+      }
+      continue;
+    }
+    if (c === "[") {
+      depthBracket++;
+    } else if (c === "]") {
+      depthBracket--;
+    } else if (c === "{") {
+      depthBrace++;
+    } else if (c === "}") {
+      depthBrace--;
+    }
+    if (depthBracket < 0 || depthBrace < 0) {
+      onUnbalanced();
+    }
+    if (onChar(c, i, depthBracket === 0 && depthBrace === 0) === "stop") {
+      return;
+    }
+  }
+  if (depthBracket !== 0 || depthBrace !== 0 || inQuote) {
+    onUnbalanced();
+  }
+}
+
+/** First top-level occurrence of `ch` in `s`; -1 when absent. */
+export function indexOfTopLevel(s: string, ch: string): number {
+  let result = -1;
+  const failLocal = (): never => {
+    throw new OcPathError(`Unbalanced bracket/brace in oc:// path: ${s}`, s, "OC_PATH_UNBALANCED");
+  };
+  scanBracketAware(
+    s,
+    (c, i, atTop) => {
+      if (atTop && c === ch) {
+        result = i;
+        return "stop";
+      }
+      return undefined;
+    },
+    failLocal,
+  );
+  return result;
+}
+
+export function splitRespectingBrackets(
+  s: string,
+  delim: string,
+  originalInput?: string,
+): string[] {
+  const out: string[] = [];
+  let buf = "";
+  const ctx = originalInput ?? s;
+  const onUnbalanced = (): never => {
+    fail(`Unbalanced bracket/brace in oc:// path: ${ctx}`, ctx, "OC_PATH_UNBALANCED");
+  };
+  scanBracketAware(
+    s,
+    (c, _i, atTop) => {
+      if (atTop && c === delim) {
+        out.push(buf);
+        buf = "";
+        return;
+      }
+      buf += c;
+    },
+    onUnbalanced,
+  );
+  out.push(buf);
+  return out;
+}
+
+/** True iff `seg` is `"..."`. */
+export function isQuotedSeg(seg: string): boolean {
+  return seg.length >= 2 && seg.startsWith('"') && seg.endsWith('"');
+}
+
+/** Strip surrounding quotes. Content is byte-literal. */
+export function unquoteSeg(seg: string): string {
+  return isQuotedSeg(seg) ? seg.slice(1, -1) : seg;
+}
+
+// Refuses values with `"` or `\` — no escape mechanism.
+export function quoteSeg(value: string): string {
+  if (value.length === 0) {
+    return '""';
+  }
+  if (value.includes('"') || value.includes("\\")) {
+    fail(
+      `Cannot quote value containing '"' or '\\\\': ${printable(value)}`,
+      value,
+      "OC_PATH_UNQUOTABLE",
+    );
+  }
+  return /[/.[\]{}?&%\s]/.test(value) ? `"${value}"` : value;
+}
+
+// Defense-in-depth — the splitter validates segments it splits; this
+// catches stray unmatched brackets in unsplit ones.
+function validateBrackets(seg: string, input: string): void {
+  scanBracketAware(
+    seg,
+    () => undefined,
+    () => {
+      fail(
+        `Unbalanced bracket/brace in segment "${seg}": ${printable(input)}`,
+        input,
+        "OC_PATH_UNBALANCED",
+      );
+    },
+  );
+}
+
+function validateSubSegment(sub: string, input: string): void {
+  if (sub.length === 0) {
+    fail(
+      `Empty dotted sub-segment in oc:// path: ${printable(input)}`,
+      input,
+      "OC_PATH_EMPTY_SUB_SEGMENT",
+    );
+  }
+  if (hasControlChar(sub)) {
+    fail(
+      `Control character in oc:// segment "${printable(sub)}": ${printable(input)}`,
+      input,
+      "OC_PATH_CONTROL_CHAR",
+    );
+  }
+  // Quoted content is byte-literal but can't contain `"` or `\`.
+  if (isQuotedSeg(sub)) {
+    const inner = new Set(sub.slice(1, -1));
+    if (inner.has('"') || inner.has("\\")) {
+      fail(
+        `Quoted segment cannot contain '"' or '\\\\': ${printable(sub)}`,
+        input,
+        "OC_PATH_UNQUOTABLE",
+      );
+    }
+    return;
+  }
+
+  // Reserved characters used by the path grammar itself (`?`/`&`/`%`).
+  // Allowed inside predicate / union segments — those are content.
+  if (!sub.startsWith("[") && !sub.startsWith("{")) {
+    if (RESERVED_CHARS_RE.test(sub)) {
+      fail(
+        `Reserved character (\`?\` / \`&\` / \`%\`) in oc:// segment "${sub}": ${printable(input)}`,
+        input,
+        "OC_PATH_RESERVED_CHAR",
+      );
+    }
+    if (sub !== sub.trim() || /\s/.test(sub)) {
+      fail(
+        `Whitespace in oc:// segment "${sub}": ${printable(input)}`,
+        input,
+        "OC_PATH_WHITESPACE",
+      );
+    }
+  }
+  // `[...]` is either a predicate `[k<op>v]` or a literal sentinel
+  // (e.g. `[frontmatter]`). Mismatched brackets are rejected.
+  const startsBracket = sub.startsWith("[");
+  const endsBracket = sub.endsWith("]");
+  if (startsBracket !== endsBracket) {
+    fail(
+      `Mismatched bracket in segment "${sub}": ${printable(input)}`,
+      input,
+      "OC_PATH_MALFORMED_PREDICATE",
+    );
+  }
+  if (startsBracket && endsBracket) {
+    const inner = sub.slice(1, -1);
+    if (inner.length === 0) {
+      fail(
+        `Empty bracket segment "${sub}": ${printable(input)}`,
+        input,
+        "OC_PATH_MALFORMED_PREDICATE",
+      );
+    }
+    const hasOp = ["!=", "<=", ">=", "<", ">", "="].some((op) => inner.includes(op));
+    if (hasOp) {
+      const parsed = parsePredicateSeg(sub);
+      if (parsed === null || parsed.key.length === 0 || parsed.value.length === 0) {
+        fail(
+          `Malformed predicate "${sub}" — must be \`[key<op>value]\` with non-empty key and value: ${printable(input)}`,
+          input,
+          "OC_PATH_MALFORMED_PREDICATE",
+        );
+      }
+    }
+    // Op-less brackets are literal sentinel segments (back-compat).
+  }
+  const startsBrace = sub.startsWith("{");
+  const endsBrace = sub.endsWith("}");
+  if (startsBrace !== endsBrace) {
+    fail(
+      `Mismatched brace in segment "${sub}": ${printable(input)}`,
+      input,
+      "OC_PATH_MALFORMED_UNION",
+    );
+  }
+  if (startsBrace && endsBrace) {
+    const inner = sub.slice(1, -1);
+    if (inner.length === 0) {
+      fail(
+        `Empty union "${sub}" — must contain at least one alternative: ${printable(input)}`,
+        input,
+        "OC_PATH_MALFORMED_UNION",
+      );
+    }
+    if (inner.split(",").some((a) => a.length === 0)) {
+      fail(
+        `Empty alternative in union "${sub}": ${printable(input)}`,
+        input,
+        "OC_PATH_MALFORMED_UNION",
+      );
+    }
+  }
+}

extensions/oc-path/src/oc-path/parse.ts

@@ -0,0 +1,177 @@
+/**
+ * Markdown parser for workspace files: frontmatter + preamble + H2
+ * blocks (with bullet items as the only addressable structural child).
+ * Tokenization via markdown-it; frontmatter handled here.
+ *
+ * Grammar opinions (indented `##`, empty `## `, ordered lists, nested
+ * sub-bullets) live in lint rules, not the parser.
+ *
+ * Byte-fidelity: `emitMd(parse(raw)) === raw`.
+ *
+ * @module @openclaw/oc-path/parse
+ */
+
+import MarkdownIt from "markdown-it";
+import type { AstBlock, AstItem, Diagnostic, FrontmatterEntry, ParseResult } from "./ast.js";
+import { slugify } from "./slug.js";
+
+type Token = ReturnType<MarkdownIt["parse"]>[number];
+
+const FENCE = "---";
+const BOM = "";
+const KV_RE = /^([^:]+?)\s*:\s*(.+)$/;
+
+const md = new MarkdownIt({ html: true });
+
+export function parseMd(raw: string): ParseResult {
+  const diagnostics: Diagnostic[] = [];
+  const withoutBom = raw.startsWith(BOM) ? raw.slice(BOM.length) : raw;
+  const lines = withoutBom.split(/\r?\n/);
+
+  const fm = detectFrontmatter(lines, diagnostics);
+  const bodyStartIdx = fm === null ? 0 : fm.endLine + 1;
+  const bodyLines = lines.slice(bodyStartIdx);
+  const bodyFileLine = bodyStartIdx + 1;
+
+  const tokens = md.parse(bodyLines.join("\n"), {});
+  const { preamble, blocks } = walkBlocks(tokens, bodyLines, bodyFileLine);
+
+  return {
+    ast: { kind: "md", raw, frontmatter: fm?.entries ?? [], preamble, blocks },
+    diagnostics,
+  };
+}
+
+// ---------- Frontmatter ---------------------------------------------------
+
+interface FrontmatterRange {
+  readonly entries: readonly FrontmatterEntry[];
+  /** 0-based line index of the closing `---`. */
+  readonly endLine: number;
+}
+
+function detectFrontmatter(
+  lines: readonly string[],
+  diagnostics: Diagnostic[],
+): FrontmatterRange | null {
+  if (lines.length < 2 || lines[0] !== FENCE) {
+    return null;
+  }
+  let closeIndex = -1;
+  for (let i = 1; i < lines.length; i++) {
+    if (lines[i] === FENCE) {
+      closeIndex = i;
+      break;
+    }
+  }
+  if (closeIndex === -1) {
+    diagnostics.push({
+      line: 1,
+      message: "frontmatter opens with --- but never closes",
+      severity: "warning",
+      code: "OC_FRONTMATTER_UNCLOSED",
+    });
+    return null;
+  }
+  const entries: FrontmatterEntry[] = [];
+  for (let i = 1; i < closeIndex; i++) {
+    const m = /^([a-zA-Z_][a-zA-Z0-9_-]*)\s*:\s*(.*)$/.exec(lines[i]);
+    if (m !== null) {
+      entries.push({ key: m[1], value: unquote(m[2].trim()), line: i + 1 });
+    }
+  }
+  return { entries, endLine: closeIndex };
+}
+
+function unquote(value: string): string {
+  if (value.length >= 2) {
+    const f = value.charCodeAt(0);
+    const l = value.charCodeAt(value.length - 1);
+    if (f === l && (f === 34 || f === 39)) {
+      return value.slice(1, -1);
+    }
+  }
+  return value;
+}
+
+// ---------- H2 block walker -----------------------------------------------
+
+function walkBlocks(
+  tokens: readonly Token[],
+  bodyLines: readonly string[],
+  bodyFileLine: number,
+): { preamble: string; blocks: AstBlock[] } {
+  // Match atx `##` only; setext h2 has `markup: "-"`.
+  const h2: { tokenIdx: number; lineIdx: number; text: string }[] = [];
+  for (let i = 0; i < tokens.length; i++) {
+    const t = tokens[i];
+    if (t.type === "heading_open" && t.tag === "h2" && t.markup === "##" && t.map !== null) {
+      const inline = tokens[i + 1];
+      h2.push({ tokenIdx: i, lineIdx: t.map[0], text: inline?.content ?? "" });
+    }
+  }
+
+  if (h2.length === 0) {
+    return { preamble: bodyLines.join("\n"), blocks: [] };
+  }
+
+  const preamble = bodyLines.slice(0, h2[0].lineIdx).join("\n");
+  const blocks: AstBlock[] = [];
+
+  for (let h = 0; h < h2.length; h++) {
+    const start = h2[h].lineIdx;
+    const end = h + 1 < h2.length ? h2[h + 1].lineIdx : bodyLines.length;
+    // Slice by INDEX so unmapped descendants (cells, markers, inline)
+    // ride along with their parent. h2 = open + inline + close = 3.
+    const tokenStart = h2[h].tokenIdx + 3;
+    const tokenEnd = h + 1 < h2.length ? h2[h + 1].tokenIdx : tokens.length;
+    const blockTokens = tokens.slice(tokenStart, tokenEnd);
+    blocks.push({
+      heading: h2[h].text,
+      slug: slugify(h2[h].text),
+      line: bodyFileLine + start,
+      bodyText: bodyLines.slice(start + 1, end).join("\n"),
+      items: extractItems(blockTokens, bodyFileLine),
+    });
+  }
+
+  return { preamble, blocks };
+}
+
+// ---------- Item extraction ----------------------------------------------
+
+// Every list_item_open becomes an item (bullets, numbered, nested
+// sub-bullets); lint rules flag depth / duplicate-slug collisions.
+function extractItems(tokens: readonly Token[], bodyFileLine: number): AstItem[] {
+  const items: AstItem[] = [];
+  for (let i = 0; i < tokens.length; i++) {
+    const t = tokens[i];
+    if (t.type !== "list_item_open" || t.map === null) {
+      continue;
+    }
+    // First inline at the item's own depth is the item text.
+    let nestedDepth = 0;
+    let text = "";
+    for (let j = i + 1; j < tokens.length; j++) {
+      const x = tokens[j];
+      if (x.type === "list_item_close" && nestedDepth === 0) {
+        break;
+      }
+      if (x.type === "bullet_list_open" || x.type === "ordered_list_open") {
+        nestedDepth++;
+      } else if (x.type === "bullet_list_close" || x.type === "ordered_list_close") {
+        nestedDepth--;
+      } else if (x.type === "inline" && nestedDepth === 0 && text === "") {
+        text = x.content;
+      }
+    }
+    const kvMatch = KV_RE.exec(text);
+    items.push({
+      text,
+      slug: kvMatch ? slugify(kvMatch[1]) : slugify(text),
+      line: bodyFileLine + t.map[0],
+      ...(kvMatch !== null ? { kv: { key: kvMatch[1].trim(), value: kvMatch[2].trim() } } : {}),
+    });
+  }
+  return items;
+}

extensions/oc-path/src/oc-path/resolve.ts

@@ -0,0 +1,95 @@
+/**
+ * OcPath → MdAst node. Walks an in-memory AST; the file slot is
+ * informational (callers verify file matching upstream).
+ *
+ *   { file }                         → root
+ *   { file, section }                → block
+ *   { file, section, item }          → item
+ *   { file, section, item, field }   → kv.value
+ *
+ * @module @openclaw/oc-path/resolve
+ */
+
+import type { AstBlock, AstItem, FrontmatterEntry, MdAst } from "./ast.js";
+import type { OcPath } from "./oc-path.js";
+import { isOrdinalSeg, isPositionalSeg, parseOrdinalSeg, resolvePositionalSeg } from "./oc-path.js";
+
+export type OcPathMatch =
+  | { readonly kind: "root"; readonly node: MdAst }
+  | { readonly kind: "frontmatter"; readonly node: FrontmatterEntry }
+  | { readonly kind: "block"; readonly node: AstBlock }
+  | { readonly kind: "item"; readonly node: AstItem; readonly block: AstBlock }
+  | {
+      readonly kind: "item-field";
+      readonly node: AstItem;
+      readonly block: AstBlock;
+      /** The kv.value string, surfaced for convenience. */
+      readonly value: string;
+    };
+
+/**
+ * Resolve. Slugs match case-insensitively. `[frontmatter]` is a
+ * literal section sentinel; the frontmatter key sits at `item` (or
+ * `field` for 4-segment callers).
+ */
+export function resolveMdOcPath(ast: MdAst, path: OcPath): OcPathMatch | null {
+  if (path.section === "[frontmatter]") {
+    const key = path.item ?? path.field;
+    if (key === undefined) {
+      return null;
+    }
+    const entry = ast.frontmatter.find((e) => e.key === key);
+    if (entry === undefined) {
+      return null;
+    }
+    return { kind: "frontmatter", node: entry };
+  }
+
+  if (path.section === undefined) {
+    return { kind: "root", node: ast };
+  }
+
+  const block = ast.blocks.find((b) => b.slug === path.section!.toLowerCase());
+  if (block === undefined) {
+    return null;
+  }
+  if (path.item === undefined) {
+    return { kind: "block", node: block };
+  }
+
+  // Item dispatch: ordinal (#N) > positional ($last) > slug.
+  // Ordinal uses document order so duplicate-slug items stay distinct.
+  let item: AstItem | undefined;
+  if (isOrdinalSeg(path.item)) {
+    const n = parseOrdinalSeg(path.item);
+    if (n === null || n < 0 || n >= block.items.length) {
+      return null;
+    }
+    item = block.items[n];
+  } else if (isPositionalSeg(path.item)) {
+    const concrete = resolvePositionalSeg(path.item, {
+      indexable: true,
+      size: block.items.length,
+    });
+    if (concrete === null) {
+      return null;
+    }
+    item = block.items[Number(concrete)];
+  } else {
+    item = block.items.find((i) => i.slug === path.item!.toLowerCase());
+  }
+  if (item === undefined) {
+    return null;
+  }
+  if (path.field === undefined) {
+    return { kind: "item", node: item, block };
+  }
+
+  if (item.kv === undefined) {
+    return null;
+  }
+  if (item.kv.key.toLowerCase() !== path.field.toLowerCase()) {
+    return null;
+  }
+  return { kind: "item-field", node: item, block, value: item.kv.value };
+}

extensions/oc-path/src/oc-path/sentinel.ts

@@ -0,0 +1,33 @@
+/**
+ * Redaction-sentinel guard. Throws at emit boundaries so every write
+ * path is covered, not just audited consumers.
+ *
+ * @module @openclaw/oc-path/sentinel
+ */
+
+/** Literal marking a redacted secret. Writing it to disk is always a bug. */
+export const REDACTED_SENTINEL = "__OPENCLAW_REDACTED__";
+
+/**
+ * Thrown when emit detects the sentinel in output bytes. Fail-closed:
+ * stripping would silently corrupt the file. `path` is the closest
+ * OcPath-shaped pointer to the violation.
+ */
+export class OcEmitSentinelError extends Error {
+  readonly code = "OC_EMIT_SENTINEL";
+  readonly path: string;
+
+  constructor(path: string) {
+    super(`emit refused to write "${REDACTED_SENTINEL}" sentinel literal at ${path}`);
+    this.name = "OcEmitSentinelError";
+    this.path = path;
+  }
+}
+
+// Substring match (not equality) — `prefix__OPENCLAW_REDACTED__suffix`
+// still leaks the marker. No-op on non-string input.
+export function guardSentinel(value: unknown, ocPath: string): void {
+  if (typeof value === "string" && value.includes(REDACTED_SENTINEL)) {
+    throw new OcEmitSentinelError(ocPath);
+  }
+}

extensions/oc-path/src/oc-path/slug.ts

@@ -0,0 +1,20 @@
+/**
+ * Slug derivation: kebab-case lowercase, deterministic, idempotent.
+ * Used by parse + resolve for section/item addressing.
+ *
+ * @module @openclaw/oc-path/slug
+ */
+
+const NON_SLUG_CHARS = /[^a-z0-9-]+/g;
+const COLLAPSE_HYPHENS = /-+/g;
+const TRIM_HYPHENS = /^-+|-+$/g;
+
+/** Empty string for input with no slug-valid chars; callers treat as not matchable. */
+export function slugify(text: string): string {
+  return text
+    .toLowerCase()
+    .replace(/_/g, "-")
+    .replace(NON_SLUG_CHARS, "-")
+    .replace(COLLAPSE_HYPHENS, "-")
+    .replace(TRIM_HYPHENS, "");
+}

extensions/oc-path/src/oc-path/tests/edit.test.ts

@@ -0,0 +1,108 @@
+// OC Path tests cover edit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { setMdOcPath as setOcPath } from "../edit.js";
+import { parseOcPath } from "../oc-path.js";
+import { parseMd } from "../parse.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../sentinel.js";
+
+describe("setOcPath — frontmatter", () => {
+  it("replaces a frontmatter value", () => {
+    const raw = `---
+name: github
+description: old desc
+---
+
+Body.
+`;
+    const { ast } = parseMd(raw);
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/[frontmatter]/description"), "new desc");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("description: new desc");
+      expect(r.ast.raw).not.toContain("old desc");
+    }
+  });
+
+  it("reports unresolved when the key is missing", () => {
+    const { ast } = parseMd("---\nname: x\n---\n");
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/[frontmatter]/nope"), "x");
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+
+  it("quotes frontmatter values containing structural chars", () => {
+    const { ast } = parseMd("---\nx: a\n---\n");
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/[frontmatter]/x"), "has: colon");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain('x: "has: colon"');
+    }
+  });
+});
+
+describe("setOcPath — item kv field", () => {
+  it("replaces an item kv value and reflects it in the rebuilt body", () => {
+    const raw = `## Boundaries
+
+- enabled: true
+- timeout: 5
+`;
+    const { ast } = parseMd(raw);
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/boundaries/timeout/timeout"), "30");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("- timeout: 30");
+      expect(r.ast.raw).toContain("- enabled: true");
+    }
+  });
+
+  it("reports no-item-kv for an item without kv shape", () => {
+    const raw = `## Boundaries
+
+- plain bullet
+`;
+    const { ast } = parseMd(raw);
+    const r = setOcPath(
+      ast,
+      parseOcPath("oc://AGENTS.md/boundaries/plain-bullet/plain-bullet"),
+      "x",
+    );
+    expect(r).toEqual({ ok: false, reason: "no-item-kv" });
+  });
+
+  it("reports unresolved when section/item is missing", () => {
+    const { ast } = parseMd("## Other\n\n- foo: bar\n");
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/missing/foo/foo"), "x");
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+
+  it("reports not-writable for section-only addresses", () => {
+    const { ast } = parseMd("## Boundaries\n\n- enabled: true\n");
+    const r = setOcPath(ast, parseOcPath("oc://AGENTS.md/boundaries"), "x");
+    expect(r).toEqual({ ok: false, reason: "not-writable" });
+  });
+});
+
+describe("setOcPath — sentinel guard (defense-in-depth)", () => {
+  // The JSONC + JSONL paths reject sentinel-bearing values at the
+  // substrate boundary; the md path was deferring entirely to round-trip
+  // echo through emitMd, which acceptPreExistingSentinel:true skips.
+  // Closing the gap keeps F9 (formatter sentinel guard) symmetric across
+  // all three kinds.
+  it("rejects bare sentinel on frontmatter value", () => {
+    const { ast } = parseMd("---\nname: x\n---\n");
+    expect(() =>
+      setOcPath(ast, parseOcPath("oc://AGENTS.md/[frontmatter]/name"), REDACTED_SENTINEL),
+    ).toThrow(OcEmitSentinelError);
+  });
+
+  it("rejects substring-embedded sentinel on item kv", () => {
+    const { ast } = parseMd("## Boundaries\n\n- enabled: true\n");
+    expect(() =>
+      setOcPath(
+        ast,
+        parseOcPath("oc://AGENTS.md/boundaries/enabled/enabled"),
+        `prefix${REDACTED_SENTINEL}suffix`,
+      ),
+    ).toThrow(OcEmitSentinelError);
+  });
+});

extensions/oc-path/src/oc-path/tests/emit.test.ts

@@ -0,0 +1,107 @@
+// OC Path tests cover emit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../emit.js";
+import { parseMd } from "../parse.js";
+import { OcEmitSentinelError } from "../sentinel.js";
+
+describe("emit — round-trip mode (default)", () => {
+  it("returns the raw bytes byte-for-byte", () => {
+    const raw = `---\nname: x\n---\n\n## Sec\n\n- a\n- b\n`;
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+  });
+
+  it("round-trips CRLF line endings", () => {
+    const raw = "## Heading\r\n\r\n- item\r\n";
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+  });
+
+  it("round-trips a file with no frontmatter and no sections", () => {
+    const raw = "Just preamble. No structure.\n";
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+  });
+
+  it("echoes raw bytes containing the sentinel by default; strict mode rejects", () => {
+    // Round-trip trusts parsed bytes — see emit.ts policy comment.
+    // Strict mode (acceptPreExistingSentinel: false) is the opt-in
+    // path for callers that want LKG-style fingerprint verification.
+    const raw = "## Section\n\n- token: __OPENCLAW_REDACTED__\n";
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    expect(() => emitMd(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+});
+
+describe("emit — render mode", () => {
+  it("renders frontmatter + blocks", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [
+        { key: "name", value: "github", line: 2 },
+        { key: "description", value: "gh CLI", line: 3 },
+      ],
+      preamble: "",
+      blocks: [
+        {
+          heading: "Tools",
+          slug: "tools",
+          line: 5,
+          bodyText: "- gh: GitHub",
+          items: [{ text: "gh: GitHub", slug: "gh", line: 7, kv: { key: "gh", value: "GitHub" } }],
+          tables: [],
+          codeBlocks: [],
+        },
+      ],
+    };
+    const output = emitMd(ast, { mode: "render" });
+    expect(output).toContain("name: github");
+    expect(output).toContain("description: gh CLI");
+    expect(output).toContain("## Tools");
+    expect(output).toContain("- gh: GitHub");
+  });
+
+  it("quotes frontmatter values containing special chars", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [{ key: "title", value: "a: b", line: 2 }],
+      preamble: "",
+      blocks: [],
+    };
+    const output = emitMd(ast, { mode: "render" });
+    expect(output).toContain('title: "a: b"');
+  });
+
+  it("throws if a kv item value matches the sentinel", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [],
+      preamble: "",
+      blocks: [
+        {
+          heading: "Secrets",
+          slug: "secrets",
+          line: 1,
+          bodyText: "- token: __OPENCLAW_REDACTED__",
+          items: [
+            {
+              text: "token: __OPENCLAW_REDACTED__",
+              slug: "token",
+              line: 2,
+              kv: { key: "token", value: "__OPENCLAW_REDACTED__" },
+            },
+          ],
+          tables: [],
+          codeBlocks: [],
+        },
+      ],
+    };
+    expect(() => emitMd(ast, { mode: "render", fileNameForGuard: "AGENTS.md" })).toThrow(
+      OcEmitSentinelError,
+    );
+  });
+});

extensions/oc-path/src/oc-path/tests/find.test.ts

@@ -0,0 +1,594 @@
+// OC Path tests cover find plugin behavior.
+import { describe, expect, it } from "vitest";
+import { findOcPaths } from "../find.js";
+import { parseJsonc } from "../jsonc/parse.js";
+import { parseJsonl } from "../jsonl/parse.js";
+import { formatOcPath, hasWildcard, OcPathError, parseOcPath } from "../oc-path.js";
+import { parseMd } from "../parse.js";
+import { resolveOcPath, setOcPath } from "../universal.js";
+
+describe("hasWildcard", () => {
+  it("detects single-segment * in any slot", () => {
+    expect(hasWildcard(parseOcPath("oc://X/*/y"))).toBe(true);
+    expect(hasWildcard(parseOcPath("oc://X/a/*"))).toBe(true);
+    expect(hasWildcard(parseOcPath("oc://X/a/b/*"))).toBe(true);
+  });
+
+  it("detects ** in any slot", () => {
+    expect(hasWildcard(parseOcPath("oc://X/**"))).toBe(true);
+    expect(hasWildcard(parseOcPath("oc://X/a/**/c"))).toBe(true);
+  });
+
+  it("detects wildcards inside dotted sub-segments", () => {
+    expect(hasWildcard(parseOcPath("oc://X/a.*.c"))).toBe(true);
+    expect(hasWildcard(parseOcPath("oc://X/a.**.c"))).toBe(true);
+  });
+
+  it("returns false for plain paths", () => {
+    expect(hasWildcard(parseOcPath("oc://X/a/b/c"))).toBe(false);
+    expect(hasWildcard(parseOcPath("oc://X/a.b.c"))).toBe(false);
+  });
+
+  it("treats `*` inside an identifier as literal", () => {
+    expect(hasWildcard(parseOcPath("oc://X/foo*bar"))).toBe(false);
+    expect(hasWildcard(parseOcPath("oc://X/a*"))).toBe(false);
+  });
+});
+
+describe("wildcard guard", () => {
+  const ast = parseJsonc('{"steps":[{"id":"a","command":"foo"}]}').ast;
+
+  it("resolveOcPath throws OcPathError for wildcard pattern", () => {
+    expect(() => resolveOcPath(ast, parseOcPath("oc://wf/steps/*/command"))).toThrow(/findOcPaths/);
+    try {
+      resolveOcPath(ast, parseOcPath("oc://wf/**"));
+      expect.fail("should have thrown");
+    } catch (err) {
+      expect(err).toBeInstanceOf(OcPathError);
+      expect((err as OcPathError).code).toBe("OC_PATH_WILDCARD_IN_RESOLVE");
+    }
+  });
+
+  it("setOcPath returns wildcard-not-allowed for wildcard pattern", () => {
+    const r = setOcPath(ast, parseOcPath("oc://wf/steps/*/command"), "bar");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("wildcard-not-allowed");
+    }
+  });
+
+  it("setOcPath wildcard guard reason carries actionable detail", () => {
+    const r = setOcPath(ast, parseOcPath("oc://wf/**"), "bar");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.detail).toContain("findOcPaths");
+    }
+  });
+});
+
+describe("findOcPaths — non-wildcard fast-path", () => {
+  it("wraps resolveOcPath result for plain path", () => {
+    const ast = parseJsonc('{"name":"x"}').ast;
+    const out = findOcPaths(ast, parseOcPath("oc://wf/name"));
+    expect(out).toHaveLength(1);
+    expect(out[0].match.kind).toBe("leaf");
+    expect(formatOcPath(out[0].path)).toBe("oc://wf/name");
+  });
+
+  it("returns empty for unresolved plain path", () => {
+    const ast = parseJsonc('{"name":"x"}').ast;
+    expect(findOcPaths(ast, parseOcPath("oc://wf/missing"))).toHaveLength(0);
+  });
+});
+
+describe("findOcPaths — JSONC kind", () => {
+  const jsonc = parseJsonc(
+    "{\n" +
+      '  "plugins": {\n' +
+      '    "github": {"enabled": true},\n' +
+      '    "gitlab": {"enabled": false},\n' +
+      '    "slack": {"enabled": true}\n' +
+      "  }\n" +
+      "}\n",
+  ).ast;
+
+  it("* in item slot enumerates each plugin", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://config/plugins/*/enabled"));
+    expect(out).toHaveLength(3);
+    const keys = out.map((m) => m.path.item);
+    expect(keys.toSorted((a, b) => (a ?? "").localeCompare(b ?? ""))).toEqual([
+      "github",
+      "gitlab",
+      "slack",
+    ]);
+  });
+
+  it("returns boolean leaves with leafType", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://config/plugins/*/enabled"));
+    for (const m of out) {
+      expect(m.match.kind).toBe("leaf");
+      if (m.match.kind === "leaf") {
+        expect(m.match.leafType).toBe("boolean");
+      }
+    }
+  });
+});
+
+describe("findOcPaths — slash-deep JSONC paths", () => {
+  const jsonc = parseJsonc(
+    JSON.stringify({
+      mcp: {
+        servers: {
+          github: { env: { GITHUB_TOKEN: "gh-token" } },
+          gitlab: { env: { GITHUB_TOKEN: "gl-token" } },
+        },
+      },
+      agents: [
+        { id: "coder", tools: { exec: { security: "deny" } } },
+        { id: "reviewer", tools: { exec: { security: "allowlist" } } },
+      ],
+    }),
+  ).ast;
+
+  it("expands * in a slash-deep JSON object path", () => {
+    const out = findOcPaths(
+      jsonc,
+      parseOcPath("oc://openclaw.json/mcp/servers/*/env/GITHUB_TOKEN"),
+    );
+    expect(out).toHaveLength(2);
+    const values = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(values.toSorted()).toEqual(["gh-token", "gl-token"]);
+  });
+
+  it("expands * in a slash-deep JSON array path", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://openclaw.json/agents/*/tools/exec/security"));
+    expect(out).toHaveLength(2);
+    const values = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(values.toSorted()).toEqual(["allowlist", "deny"]);
+  });
+
+  it("expands predicates in slash-deep JSON array paths", () => {
+    const out = findOcPaths(
+      jsonc,
+      parseOcPath("oc://openclaw.json/agents/[id=reviewer]/tools/exec/security"),
+    );
+    expect(out).toHaveLength(1);
+    expect(out[0]?.match.kind === "leaf" && out[0].match.valueText).toBe("allowlist");
+  });
+
+  it("expands ** in slash-deep JSON paths", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://openclaw.json/mcp/**/GITHUB_TOKEN"));
+    expect(out).toHaveLength(2);
+    const values = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(values.toSorted()).toEqual(["gh-token", "gl-token"]);
+  });
+
+  it("returns slash-deep JSON matches as concrete paths that resolve", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://openclaw.json/agents/*/tools/exec/security"));
+    for (const m of out) {
+      expect(resolveOcPath(jsonc, m.path)?.kind).toBe("leaf");
+      expect(formatOcPath(m.path)).not.toContain("*");
+    }
+  });
+});
+
+describe("findOcPaths — JSONL kind", () => {
+  const jsonl = parseJsonl(
+    '{"event":"start","userId":"u1"}\n' +
+      '{"event":"action","userId":"u1"}\n' +
+      '{"event":"end","userId":"u1"}\n',
+  ).ast;
+
+  it("* in section slot enumerates each value line", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/*/event"));
+    expect(out).toHaveLength(3);
+    const events = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(events).toEqual(["start", "action", "end"]);
+  });
+
+  it("preserves Lnnn line addresses in concrete paths", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/*/event"));
+    for (const m of out) {
+      expect(m.path.section).toMatch(/^L\d+$/);
+    }
+  });
+
+  it("union {L1,L2} at line slot enumerates each alternative", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/{L1,L3}/event"));
+    expect(out).toHaveLength(2);
+    const events = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(events).toEqual(["start", "end"]);
+  });
+
+  it("union of positional + literal line addresses works", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/{L1,$last}/event"));
+    expect(out).toHaveLength(2);
+    const events = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(events).toEqual(["start", "end"]);
+  });
+
+  it("predicate [event=action] at line slot filters by top-level field", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/[event=action]/userId"));
+    expect(out).toHaveLength(1);
+    if (out[0]?.match.kind === "leaf") {
+      expect(out[0].match.valueText).toBe("u1");
+    }
+  });
+
+  it("predicate [event=missing] at line slot matches zero lines (silent zero is correct)", () => {
+    const out = findOcPaths(jsonl, parseOcPath("oc://session/[event=missing]/userId"));
+    expect(out).toHaveLength(0);
+  });
+});
+
+describe("positional primitives — $first / $last", () => {
+  it("$first picks first array element", () => {
+    const jsonc = parseJsonc('{"items":[10,20,30]}').ast;
+    const m = resolveOcPath(jsonc, parseOcPath("oc://config/items/$first"));
+    expect(m?.kind === "leaf" && m.valueText).toBe("10");
+  });
+
+  it("$last picks last array element", () => {
+    const jsonc = parseJsonc('{"items":[10,20,30]}').ast;
+    const m = resolveOcPath(jsonc, parseOcPath("oc://config/items/$last"));
+    expect(m?.kind === "leaf" && m.valueText).toBe("30");
+  });
+
+  it("$first picks first value line on jsonl", () => {
+    const jsonl = parseJsonl('{"event":"start"}\n{"event":"step"}\n{"event":"end"}\n').ast;
+    const m = resolveOcPath(jsonl, parseOcPath("oc://session/$first/event"));
+    expect(m?.kind === "leaf" && m.valueText).toBe("start");
+  });
+
+  it("$last picks last value line on jsonl", () => {
+    const jsonl = parseJsonl('{"event":"start"}\n{"event":"step"}\n{"event":"end"}\n').ast;
+    const m = resolveOcPath(jsonl, parseOcPath("oc://session/$last/event"));
+    expect(m?.kind === "leaf" && m.valueText).toBe("end");
+  });
+
+  it("hasWildcard returns false for positional tokens", () => {
+    expect(hasWildcard(parseOcPath("oc://X/$first/id"))).toBe(false);
+    expect(hasWildcard(parseOcPath("oc://X/$last/id"))).toBe(false);
+  });
+});
+
+describe("quoted segments (v1.0)", () => {
+  const jsonc = parseJsonc(
+    '{"agents":{"defaults":{"models":{' +
+      '"anthropic/claude-opus-4-7":{"alias":"opus47","contextWindow":1000000},' +
+      '"github-copilot/claude-opus-4.7-1m-internal":{"alias":"copilot-opus-1m","contextWindow":1000000},' +
+      '"plain":{"alias":"p","contextWindow":200000}' +
+      "}}}}",
+  ).ast;
+
+  it("resolveOcPath — quoted segment with literal slash", () => {
+    const m = resolveOcPath(
+      jsonc,
+      parseOcPath('oc://config/agents.defaults.models/"anthropic/claude-opus-4-7"/alias'),
+    );
+    expect(m?.kind).toBe("leaf");
+    if (m?.kind === "leaf") {
+      expect(m.valueText).toBe("opus47");
+    }
+  });
+
+  it("resolveOcPath — quoted segment with literal slash AND dot", () => {
+    const m = resolveOcPath(
+      jsonc,
+      parseOcPath(
+        'oc://config/agents.defaults.models/"github-copilot/claude-opus-4.7-1m-internal"/alias',
+      ),
+    );
+    expect(m?.kind).toBe("leaf");
+    if (m?.kind === "leaf") {
+      expect(m.valueText).toBe("copilot-opus-1m");
+    }
+  });
+
+  it("quoted segment with whitespace", () => {
+    const ast = parseJsonc('{"prompts":{"hello world":"value"}}').ast;
+    const m = resolveOcPath(ast, parseOcPath('oc://X/prompts/"hello world"'));
+    expect(m?.kind).toBe("leaf");
+    if (m?.kind === "leaf") {
+      expect(m.valueText).toBe("value");
+    }
+  });
+
+  it('rejects quoted segments containing `"` or `\\` (no escape support)', () => {
+    expect(() => parseOcPath('oc://X/keys/"a\\\\b"')).toThrow(/Quoted segment cannot contain/);
+  });
+
+  it("findOcPaths — wildcard returns paths with quoted keys when needed", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://config/agents.defaults.models/*/alias"));
+    expect(out).toHaveLength(3);
+    const items = out.map((m) => m.path.item);
+    expect(items.some((s) => s === "plain")).toBe(true);
+    expect(items.some((s) => s === '"anthropic/claude-opus-4-7"')).toBe(true);
+    expect(items.some((s) => s === '"github-copilot/claude-opus-4.7-1m-internal"')).toBe(true);
+  });
+
+  it("findOcPaths — emitted paths round-trip through resolveOcPath", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://config/agents.defaults.models/*/alias"));
+    for (const m of out) {
+      const r = resolveOcPath(jsonc, m.path);
+      expect(r?.kind).toBe("leaf");
+    }
+  });
+
+  it("rejects unbalanced quotes at parse time", () => {
+    expect(() => parseOcPath('oc://X/"unterminated')).toThrow(/Unbalanced/);
+  });
+
+  it("control characters still rejected inside quotes", () => {
+    expect(() => parseOcPath('oc://X/"\x00"')).toThrow(/Control character/);
+  });
+});
+
+describe("value predicates — numeric operators (v1.1)", () => {
+  const jsonc = parseJsonc(
+    '{"models":{"providers":{"anthropic":{"models":[' +
+      '{"id":"claude-sonnet-4-6","contextWindow":1000000,"maxTokens":128000},' +
+      '{"id":"claude-opus-4-7","contextWindow":1000000,"maxTokens":240000},' +
+      '{"id":"claude-sonnet-4-7","contextWindow":200000,"maxTokens":64000}' +
+      "]}}}}",
+  ).ast;
+
+  const PREFIX = "oc://config/models.providers.anthropic.models";
+
+  it("> finds models exceeding the per-request output cap", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[maxTokens>128000]/id`));
+    expect(out).toHaveLength(1);
+    if (out[0].match.kind === "leaf") {
+      expect(out[0].match.valueText).toBe("claude-opus-4-7");
+    }
+  });
+
+  it(">= matches the boundary", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[maxTokens>=128000]/id`));
+    const ids = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(ids.toSorted()).toEqual(["claude-opus-4-7", "claude-sonnet-4-6"]);
+  });
+
+  it("< filters small context windows", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[contextWindow<500000]/id`));
+    expect(out).toHaveLength(1);
+    if (out[0].match.kind === "leaf") {
+      expect(out[0].match.valueText).toBe("claude-sonnet-4-7");
+    }
+  });
+
+  it("<= matches the boundary", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[contextWindow<=200000]/id`));
+    const ids = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(ids).toEqual(["claude-sonnet-4-7"]);
+  });
+
+  it("numeric operator rejects non-numeric leaves silently", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[id>5]/id`));
+    expect(out).toHaveLength(0);
+  });
+
+  it("rejects numeric predicate value that is not a number", () => {
+    const out = findOcPaths(jsonc, parseOcPath(`${PREFIX}/[maxTokens>foo]/id`));
+    expect(out).toHaveLength(0);
+  });
+});
+
+describe("value predicates — jsonc", () => {
+  const jsonc = parseJsonc(
+    '{"plugins":{"github":{"enabled":true,"role":"vcs"},"slack":{"enabled":false,"role":"chat"},"jira":{"enabled":true,"role":"tracker"}}}',
+  ).ast;
+
+  it("[enabled=true] filters by sibling boolean", () => {
+    const out = findOcPaths(jsonc, parseOcPath("oc://config/plugins/[enabled=true]/role"));
+    expect(out).toHaveLength(2);
+    const roles = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(roles.toSorted()).toEqual(["tracker", "vcs"]);
+  });
+});
+
+describe("ordinal addressing — md", () => {
+  // Two items share slug `foo` after slugify.
+  const md = parseMd("## Tools\n\n- foo: a\n- foo: b\n- bar: c\n").ast;
+
+  it("#0 picks the first item by document order", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://AGENTS.md/tools/#0/foo"));
+    expect(m?.kind).toBe("leaf");
+    if (m?.kind === "leaf") {
+      expect(m.valueText).toBe("a");
+    }
+  });
+
+  it("#1 picks the second item — distinct from #0 even though slug collides", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://AGENTS.md/tools/#1/foo"));
+    expect(m?.kind).toBe("leaf");
+    if (m?.kind === "leaf") {
+      expect(m.valueText).toBe("b");
+    }
+  });
+
+  it("out-of-range #N returns null", () => {
+    expect(resolveOcPath(md, parseOcPath("oc://AGENTS.md/tools/#99/foo"))).toBeNull();
+  });
+
+  it("findOcPaths disambiguates duplicate-slug items via #N", () => {
+    const out = findOcPaths(md, parseOcPath("oc://AGENTS.md/tools/*/foo"));
+    expect(out).toHaveLength(2);
+    const items = out.map((m) => m.path.item);
+    expect(items).toEqual(["#0", "#1"]);
+    const values = out.map((m) => (m.match.kind === "leaf" ? m.match.valueText : ""));
+    expect(values.toSorted()).toEqual(["a", "b"]);
+  });
+
+  it("non-duplicate slug keeps slug form (back-compat)", () => {
+    const md2 = parseMd("## Tools\n\n- foo: a\n- bar: b\n").ast;
+    const out = findOcPaths(md2, parseOcPath("oc://AGENTS.md/tools/*"));
+    const items = out.map((m) => m.path.item);
+    expect(items.toSorted((a, b) => (a ?? "").localeCompare(b ?? ""))).toEqual(["bar", "foo"]);
+  });
+});
+
+describe("findOcPaths — Markdown kind", () => {
+  const md = parseMd(
+    "---\nname: drafter\nrole: writer\n---\n\n" +
+      "## Tools\n\n" +
+      "- send_email: enabled\n" +
+      "- search: enabled\n" +
+      "- read_email: disabled\n",
+  ).ast;
+
+  it("* in field slot enumerates frontmatter keys", () => {
+    const out = findOcPaths(md, parseOcPath("oc://SOUL.md/[frontmatter]/*"));
+    expect(out).toHaveLength(2);
+    const keys = out.map((m) => m.path.item ?? m.path.field);
+    expect(keys.toSorted((a, b) => (a ?? "").localeCompare(b ?? ""))).toEqual(["name", "role"]);
+  });
+
+  it("* in field slot enumerates each item kv key", () => {
+    const out = findOcPaths(md, parseOcPath("oc://SKILL.md/Tools/send-email/*"));
+    expect(out).toHaveLength(1);
+    expect(out[0].match.kind).toBe("leaf");
+    if (out[0].match.kind === "leaf") {
+      expect(out[0].match.valueText).toBe("enabled");
+    }
+  });
+
+  it("* in item slot + matching field returns each item whose kv key matches", () => {
+    const out = findOcPaths(md, parseOcPath("oc://SKILL.md/Tools/*/send_email"));
+    expect(out).toHaveLength(1);
+    expect(out[0].path.item).toBe("send-email");
+  });
+
+  it("** at section slot matches items at every depth (cross-kind symmetry)", () => {
+    // The retain-i branch on `**` keeps the wildcard active across
+    // descent — without it, multi-block md files match only the
+    // immediate-block layer.
+    const multiBlock = parseMd(
+      "## Boundaries\n\n" +
+        "- never: rm -rf\n\n" +
+        "## Tools\n\n" +
+        "- send_email: enabled\n" +
+        "- search: enabled\n",
+    ).ast;
+    const out = findOcPaths(multiBlock, parseOcPath("oc://SOUL.md/**/send-email"));
+    expect(out.length).toBeGreaterThanOrEqual(1);
+    const items = out.map((m) => m.path.item).filter((v): v is string => v !== undefined);
+    expect(items).toContain("send-email");
+  });
+});
+
+describe("findOcPaths — quoted segments survive expansion", () => {
+  it("finds keys with slashes when the path quotes them and a sibling wildcards", () => {
+    const raw = `{
+  "agents": {
+    "defaults": {
+      "models": {
+        "github-copilot/claude-opus-4-7": {
+          "alias": "opus-internal",
+          "contextWindow": 200000
+        }
+      }
+    }
+  }
+}
+`;
+    const { ast } = parseJsonc(raw);
+    const out = findOcPaths(
+      ast,
+      parseOcPath(
+        'oc://config.jsonc/agents.defaults.models/"github-copilot/claude-opus-4-7"/{alias,contextWindow}',
+      ),
+    );
+    expect(out.length).toBe(2);
+    const fields = out
+      .map((m) => m.path.field)
+      .toSorted((a, b) => (a ?? "").localeCompare(b ?? ""));
+    expect(fields).toEqual(["alias", "contextWindow"]);
+  });
+});
+
+describe("union segments — md", () => {
+  const RAW = `## Boundaries
+
+- enabled: true
+- timeout: 5
+
+## Limits
+
+- max-tokens: 4096
+- alias: claude-3
+`;
+
+  it("expands {a,b} at the section slot", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/{boundaries,limits}/*/*"));
+    expect(out.length).toBe(4);
+    const sections = out
+      .map((m) => m.path.section)
+      .toSorted((a, b) => (a ?? "").localeCompare(b ?? ""));
+    expect(sections).toEqual(["boundaries", "boundaries", "limits", "limits"]);
+  });
+
+  it("expands {a,b} at the item slot", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/limits/{max-tokens,alias}/*"));
+    expect(out.length).toBe(2);
+    const items = out.map((m) => m.path.item).toSorted((a, b) => (a ?? "").localeCompare(b ?? ""));
+    expect(items).toEqual(["alias", "max-tokens"]);
+  });
+
+  it("expands {a,b} at the field slot — md items have one kv, so at most one alt", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/limits/alias/{alias,nope}"));
+    expect(out.length).toBe(1);
+    expect(out[0]?.path.field).toBe("alias");
+  });
+});
+
+describe("predicate segments — md", () => {
+  const RAW = `## Boundaries
+
+- enabled: true
+- timeout: 5
+
+## Limits
+
+- enabled: false
+- max-tokens: 4096
+`;
+
+  it("matches sections that contain an item satisfying the predicate", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/[enabled=true]/*/*"));
+    expect(out.length).toBeGreaterThan(0);
+    for (const m of out) {
+      expect(m.path.section).toBe("boundaries");
+    }
+  });
+
+  it("matches items whose kv pair satisfies the predicate", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/limits/[enabled=false]/*"));
+    expect(out.length).toBe(1);
+    expect(out[0]?.path.item).toBe("enabled");
+  });
+
+  it("matches the kv pair at the field slot", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/limits/max-tokens/[max-tokens=4096]"));
+    expect(out.length).toBe(1);
+    expect(out[0]?.path.field).toBe("max-tokens");
+  });
+
+  it("returns empty when no section's item matches", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/[enabled=maybe]/*/*"));
+    expect(out).toEqual([]);
+  });
+
+  it("returns empty when no item matches the predicate", () => {
+    const ast = parseMd(RAW).ast;
+    const out = findOcPaths(ast, parseOcPath("oc://X.md/limits/[enabled=true]/*"));
+    expect(out).toEqual([]);
+  });
+});

extensions/oc-path/src/oc-path/tests/fixtures/real/AGENTS.md

@@ -0,0 +1,17 @@
+## Roles
+
+- planner: breaks down user goals into tasks
+- executor: runs the planned tasks one at a time
+- reviewer: checks output before user-visible writes
+
+## Tools
+
+- gh: GitHub CLI for issues, PRs, CI
+- curl: HTTP client
+- rg: ripgrep — fast file content search
+
+## Boundaries
+
+- never edit /etc, /usr, or system paths
+- always confirm before destructive operations
+- read SOUL.md before each session for persona context

extensions/oc-path/src/oc-path/tests/fixtures/real/BOOTSTRAP.md

@@ -0,0 +1,17 @@
+# Workspace bootstrap
+
+This is the first thing the agent reads on a fresh workspace. Once
+the user finishes setup (filling in SOUL.md, USER.md, etc.),
+BOOTSTRAP.md gets removed and the workspace is "live."
+
+## Setup checklist
+
+- review SOUL.md and add personal context
+- review USER.md and add role/preferences
+- run `openclaw doctor` to verify config + workspace are valid
+- confirm the gateway can reach your providers
+
+## Removing this file
+
+When the checklist is complete, delete BOOTSTRAP.md. The runtime
+detects its absence as "setup complete."

extensions/oc-path/src/oc-path/tests/fixtures/real/HEARTBEAT.md

@@ -0,0 +1,16 @@
+## Every 30m wake
+
+- check unread Slack DMs in #incidents
+- summarize new PR review comments since last wake
+- if any test fails on main, surface to user immediately
+
+## Every 4h wake
+
+- compile a brief status summary of in-flight tasks
+- check Linear for new high-priority issues
+- update the daily log entry
+
+## On user-presence wake
+
+- briefly orient on what changed since last user interaction
+- prioritize incoming items by urgency

extensions/oc-path/src/oc-path/tests/fixtures/real/IDENTITY.md

@@ -0,0 +1,19 @@
+## Organization
+
+Example Org / Platform Team
+
+## Team
+
+OpenClaw infrastructure & tooling
+
+## Trust Level
+
+internal-trusted
+
+## Region
+
+us-west
+
+## Compliance scope
+
+SOC 2 Type II + FedRAMP Moderate (in audit)

extensions/oc-path/src/oc-path/tests/fixtures/real/MEMORY.md

@@ -0,0 +1,18 @@
+---
+scope: project
+---
+
+## User prefers async communication
+
+The user has mentioned twice (sessions 2026-04-15 and 2026-04-22) that
+they prefer Slack DMs over meetings for short questions.
+
+## Project uses TypeScript with strict mode
+
+The codebase enforces `strict: true` and `noUncheckedIndexedAccess`.
+Avoid `any`; prefer `unknown` with narrowing.
+
+## Deploy on Tuesdays only
+
+Production deploys happen Tue 9am-12pm Pacific. Outside that window,
+deploys go to staging and wait for the next Tuesday window.

extensions/oc-path/src/oc-path/tests/fixtures/real/SKILL.md

@@ -0,0 +1,38 @@
+---
+name: github
+description: Use gh for GitHub issues, PR status, CI/logs, comments, reviews, releases, and API queries.
+tier: T1
+tools:
+  - gh
+  - bash
+trigger_phrases:
+  - github
+  - pr
+  - issue
+  - workflow
+metadata: { "openclaw": { "emoji": "🐙", "requires": { "bins": ["gh"] } } }
+user-invocable: true
+---
+
+# When to use
+
+Use this skill when the user asks anything about GitHub: issues, pull
+requests, CI runs, releases, comments, code review, or organizational
+metadata. Prefer the `gh` CLI over web URLs — `gh` handles auth,
+pagination, and structured output natively.
+
+## Common commands
+
+```bash
+gh pr view 123              # view PR details
+gh pr checks 123            # CI status
+gh issue list --state open  # list open issues
+gh run list -L 5            # last 5 workflow runs
+gh release create v1.2.3    # cut a release
+```
+
+## When NOT to use
+
+- The user's repo is on a non-GitHub forge (GitLab, Gitea, Bitbucket).
+  Use the appropriate CLI instead.
+- Operations that require admin permissions the agent doesn't have.

extensions/oc-path/src/oc-path/tests/fixtures/real/SOUL.md

@@ -0,0 +1,17 @@
+# Persona
+
+I'm a thoughtful, methodical assistant. I ask clarifying questions
+when the user's request is ambiguous, and I'd rather be slightly
+slower than confidently wrong.
+
+## Voice
+
+- terse and direct
+- no filler words
+- code snippets > prose when explaining technical things
+
+## Boundaries
+
+- never write to /etc or system paths
+- always confirm before deleting files
+- redact secrets from logs and audit trails

extensions/oc-path/src/oc-path/tests/fixtures/real/TOOLS.md

@@ -0,0 +1,21 @@
+## Tool Guidance
+
+| tool | guidance                                                      |
+| ---- | ------------------------------------------------------------- |
+| gh   | Use for GitHub operations (issues, PRs, CI). Prefer over web. |
+| curl | HTTP client. Use --silent for clean output.                   |
+| rg   | ripgrep — content search. Faster than grep for code.          |
+| fd   | find replacement. Use over `find` when available.             |
+
+## Allow / Deny
+
+- enabled: gh
+- enabled: curl
+- enabled: rg
+- enabled: fd
+- disabled: legacy-tool
+
+## Notes
+
+The agent reads this file at session start; runtime tool gates honor
+the `enabled` flags.

extensions/oc-path/src/oc-path/tests/fixtures/real/USER.md

@@ -0,0 +1,16 @@
+## Role
+
+Senior PM working on AI runtime + governance layers. Reports to a VP-level
+stakeholder; coordinates across 4-6 engineering teams.
+
+## Preferences
+
+- async-first communication (Slack DMs > meetings)
+- terse responses; avoid filler
+- code snippets > prose for technical detail
+- always include repo:file:line citations for code claims
+
+## Working hours
+
+- Mon-Fri 9am-6pm Pacific
+- occasional evening for sync with EU teams

extensions/oc-path/src/oc-path/tests/jsonc/edit.test.ts

@@ -0,0 +1,156 @@
+// OC Path tests cover edit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { setJsoncOcPath } from "../../jsonc/edit.js";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { parseOcPath } from "../../oc-path.js";
+
+describe("setJsoncOcPath — value replacement", () => {
+  const config = `{
+  "plugins": {
+    "entries": {
+      "github": {
+        "token": "old"
+      }
+    }
+  }
+}`;
+
+  it("replaces a leaf string value", () => {
+    const { ast } = parseJsonc(config);
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/plugins.entries.github.token"), {
+      kind: "string",
+      value: "new",
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitJsonc(r.ast);
+      expect(JSON.parse(out)).toEqual({
+        plugins: { entries: { github: { token: "new" } } },
+      });
+    }
+  });
+
+  it("replaces nested objects", () => {
+    const { ast } = parseJsonc(config);
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/plugins.entries"), {
+      kind: "object",
+      entries: [{ key: "gitlab", line: 0, value: { kind: "string", value: "tok" } }],
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({
+        plugins: { entries: { gitlab: "tok" } },
+      });
+    }
+  });
+
+  it("replaces an array element by index", () => {
+    const { ast } = parseJsonc('{ "limits": [10, 20, 30] }');
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/limits.1"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({ limits: [10, 99, 30] });
+    }
+  });
+
+  it("reports unresolved for noncanonical array indexes", () => {
+    const { ast } = parseJsonc('{ "limits": [10, 20, 30] }');
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/limits.01"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+
+  it("reports unresolved when a key is missing", () => {
+    const { ast } = parseJsonc(config);
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/plugins.entries.gitlab"), {
+      kind: "string",
+      value: "x",
+    });
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+
+  it("reports no-root on empty AST", () => {
+    const { ast } = parseJsonc("");
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/x"), {
+      kind: "string",
+      value: "y",
+    });
+    expect(r).toEqual({ ok: false, reason: "no-root" });
+  });
+
+  it("does not mutate the original AST", () => {
+    const { ast } = parseJsonc(config);
+    const before = JSON.stringify(ast);
+    setJsoncOcPath(ast, parseOcPath("oc://config/plugins.entries.github.token"), {
+      kind: "string",
+      value: "new",
+    });
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+});
+
+describe("setJsoncOcPath — $last positional", () => {
+  it("edits the last array element via $last", () => {
+    const { ast } = parseJsonc('{ "items": [10, 20, 30] }');
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config.jsonc/items/$last"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({ items: [10, 20, 99] });
+    }
+  });
+
+  it("reports unresolved for $last against an empty array", () => {
+    const { ast } = parseJsonc('{ "items": [] }');
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config.jsonc/items/$last"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+});
+
+describe("setJsoncOcPath — quoted segments (regression: resolve↔edit symmetry)", () => {
+  it("edits a key containing slashes via quoted segment", () => {
+    // The provider/model alias key contains a `/`; without quoting
+    // it would be split as two segments. `resolveJsoncOcPath` handles
+    // this; `setJsoncOcPath` MUST handle it the same way or the path
+    // becomes resolve-only. Closes ClawSweeper P2 on PR #78678.
+    const raw = `{
+  "agents": {
+    "defaults": {
+      "models": {
+        "anthropic/claude-opus-4-7": { "alias": "opus" }
+      }
+    }
+  }
+}
+`;
+    const { ast } = parseJsonc(raw);
+    const r = setJsoncOcPath(
+      ast,
+      parseOcPath('oc://config.jsonc/agents.defaults.models/"anthropic/claude-opus-4-7"/alias'),
+      { kind: "string", value: "big-opus" },
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({
+        agents: {
+          defaults: {
+            models: {
+              "anthropic/claude-opus-4-7": { alias: "big-opus" },
+            },
+          },
+        },
+      });
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonc/emit.test.ts

@@ -0,0 +1,88 @@
+// OC Path tests cover emit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../../sentinel.js";
+
+describe("emitJsonc — round-trip", () => {
+  it("returns raw bytes verbatim by default", () => {
+    const raw = `{
+  // comment is preserved on round-trip
+  "x": 1,
+  "y": [/* inline */ 2, 3],
+}
+`;
+    const { ast } = parseJsonc(raw);
+    expect(emitJsonc(ast)).toBe(raw);
+  });
+
+  it("echoes pre-existing sentinel bytes by default; strict mode rejects", () => {
+    // Round-trip trusts parsed bytes — workspace files legitimately
+    // containing the sentinel (in code blocks, pasted error logs)
+    // would otherwise become a workspace-wide emit DoS. Strict mode
+    // is the opt-in path.
+    const raw = `{ "x": "${REDACTED_SENTINEL}" }`;
+    const { ast } = parseJsonc(raw);
+    expect(emitJsonc(ast)).toBe(raw);
+    expect(() =>
+      emitJsonc(ast, { fileNameForGuard: "config", acceptPreExistingSentinel: false }),
+    ).toThrow(OcEmitSentinelError);
+  });
+});
+
+describe("emitJsonc — render mode", () => {
+  it("re-stringifies the structural tree (no comments)", () => {
+    const { ast } = parseJsonc('{ /* drop me */ "x": 1, "y": [2, 3] }');
+    const out = emitJsonc(ast, { mode: "render" });
+    expect(out).not.toContain("drop me");
+    expect(JSON.parse(out)).toEqual({ x: 1, y: [2, 3] });
+  });
+
+  it("throws OcEmitSentinelError when a leaf string is the sentinel", () => {
+    const ast = parseJsonc('{ "x": "ok" }').ast;
+    const tampered = {
+      ...ast,
+      root: {
+        kind: "object" as const,
+        entries: [
+          {
+            key: "x",
+            line: 1,
+            value: { kind: "string" as const, value: REDACTED_SENTINEL },
+          },
+        ],
+      },
+    };
+    expect(() => emitJsonc(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("throws when a leaf string EMBEDS the sentinel (prefix/suffix wrap)", () => {
+    // Regression: prior to this fix, render mode used `value.value === SENTINEL`
+    // (exact match), so `prefix__OPENCLAW_REDACTED__suffix` slipped through.
+    // The roundtrip path always used `.includes()` for the same reason —
+    // render must too. Catches the sentinel-guard bypass class.
+    const ast = parseJsonc('{ "x": "ok" }').ast;
+    const tampered = {
+      ...ast,
+      root: {
+        kind: "object" as const,
+        entries: [
+          {
+            key: "x",
+            line: 1,
+            value: {
+              kind: "string" as const,
+              value: `prefix-${REDACTED_SENTINEL}-suffix`,
+            },
+          },
+        ],
+      },
+    };
+    expect(() => emitJsonc(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("renders empty AST as empty string", () => {
+    const { ast } = parseJsonc("");
+    expect(emitJsonc(ast, { mode: "render" })).toBe("");
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonc/parse.test.ts

@@ -0,0 +1,165 @@
+// OC Path tests cover parse plugin behavior.
+import { describe, expect, it } from "vitest";
+import { MAX_JSONC_INPUT_BYTES, parseJsonc } from "../../jsonc/parse.js";
+
+describe("parseJsonc — basic shapes", () => {
+  it("parses an empty object", () => {
+    const { ast, diagnostics } = parseJsonc("{}");
+    expect(diagnostics).toEqual([]);
+    expect(ast.kind).toBe("jsonc");
+    expect(ast.root).toEqual({ kind: "object", entries: [], line: 1 });
+  });
+
+  it("parses an empty array", () => {
+    const { ast, diagnostics } = parseJsonc("[]");
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toEqual({ kind: "array", items: [], line: 1 });
+  });
+
+  it("parses an empty input as null root", () => {
+    const { ast, diagnostics } = parseJsonc("");
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toBeNull();
+  });
+
+  it("parses scalars", () => {
+    expect(parseJsonc("42").ast.root).toEqual({ kind: "number", value: 42, line: 1 });
+    expect(parseJsonc("-3.14").ast.root).toEqual({ kind: "number", value: -3.14, line: 1 });
+    expect(parseJsonc("1e3").ast.root).toEqual({ kind: "number", value: 1000, line: 1 });
+    expect(parseJsonc('"hello"').ast.root).toEqual({ kind: "string", value: "hello", line: 1 });
+    expect(parseJsonc("true").ast.root).toEqual({ kind: "boolean", value: true, line: 1 });
+    expect(parseJsonc("false").ast.root).toEqual({ kind: "boolean", value: false, line: 1 });
+    expect(parseJsonc("null").ast.root).toEqual({ kind: "null", line: 1 });
+  });
+
+  it("parses nested object/array", () => {
+    const raw = '{ "plugins": { "entries": ["a", "b"] } }';
+    const { ast, diagnostics } = parseJsonc(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toEqual({
+      kind: "object",
+      line: 1,
+      entries: [
+        {
+          key: "plugins",
+          line: 1,
+          value: {
+            kind: "object",
+            line: 1,
+            entries: [
+              {
+                key: "entries",
+                line: 1,
+                value: {
+                  kind: "array",
+                  line: 1,
+                  items: [
+                    { kind: "string", value: "a", line: 1 },
+                    { kind: "string", value: "b", line: 1 },
+                  ],
+                },
+              },
+            ],
+          },
+        },
+      ],
+    });
+  });
+
+  it("preserves raw on the AST root for byte-fidelity emit", () => {
+    const raw = '{\n  "x": 1\n}\n';
+    const { ast } = parseJsonc(raw);
+    expect(ast.raw).toBe(raw);
+  });
+});
+
+describe("parseJsonc — JSONC extensions", () => {
+  it("skips line comments", () => {
+    const raw = `{
+      // comment
+      "x": 1 // trailing comment
+    }`;
+    const { ast, diagnostics } = parseJsonc(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toEqual({
+      kind: "object",
+      line: 1,
+      entries: [{ key: "x", value: { kind: "number", value: 1, line: 3 }, line: 3 }],
+    });
+  });
+
+  it("skips block comments", () => {
+    const raw = '{ /* hi */ "x": /* mid */ 1 }';
+    const { ast, diagnostics } = parseJsonc(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toEqual({
+      kind: "object",
+      line: 1,
+      entries: [{ key: "x", value: { kind: "number", value: 1, line: 1 }, line: 1 }],
+    });
+  });
+
+  it("tolerates trailing commas in objects", () => {
+    const { ast, diagnostics } = parseJsonc('{ "x": 1, }');
+    expect(diagnostics).toEqual([]);
+    expect(ast.root).toEqual({
+      kind: "object",
+      line: 1,
+      entries: [{ key: "x", value: { kind: "number", value: 1, line: 1 }, line: 1 }],
+    });
+  });
+
+  it("tolerates trailing commas in arrays", () => {
+    const { ast } = parseJsonc("[1, 2, 3,]");
+    expect(ast.root).toEqual({
+      kind: "array",
+      line: 1,
+      items: [
+        { kind: "number", value: 1, line: 1 },
+        { kind: "number", value: 2, line: 1 },
+        { kind: "number", value: 3, line: 1 },
+      ],
+    });
+  });
+
+  it("handles escape sequences in strings", () => {
+    const { ast } = parseJsonc('"a\\nb\\tc\\u0041"');
+    expect(ast.root).toEqual({ kind: "string", value: "a\nb\tcA", line: 1 });
+  });
+});
+
+describe("parseJsonc — soft errors", () => {
+  it("returns null root + error diagnostic on unrecoverable input", () => {
+    const { ast, diagnostics } = parseJsonc('{ "x" 1 }');
+    expect(ast.root).toBeNull();
+    expect(diagnostics).toHaveLength(1);
+    expect(diagnostics[0]?.severity).toBe("error");
+  });
+
+  it("warns on trailing input after a valid value", () => {
+    const { diagnostics } = parseJsonc("1 garbage");
+    expect(diagnostics).toHaveLength(1);
+    expect(diagnostics[0]?.severity).toBe("warning");
+    expect(diagnostics[0]?.code).toBe("OC_JSONC_TRAILING_INPUT");
+  });
+
+  it("rejects input larger than MAX_JSONC_INPUT_BYTES with a typed diagnostic", () => {
+    // Construct an input one byte over the cap. We don't allocate the
+    // full 16 MiB+ string in memory; `String#repeat` on a one-byte unit
+    // is enough to push past the threshold without exercising the
+    // expensive `parseTree` path (the cap fires before parse runs).
+    const oversized = "a".repeat(MAX_JSONC_INPUT_BYTES + 1);
+    const { ast, diagnostics } = parseJsonc(oversized);
+    expect(diagnostics).toHaveLength(1);
+    expect(diagnostics[0]?.severity).toBe("error");
+    expect(diagnostics[0]?.code).toBe("OC_JSONC_INPUT_TOO_LARGE");
+    expect(ast.root).toBeNull();
+  });
+
+  it("accepts input up to the cap", () => {
+    // Reasonable-shape JSON well within the cap parses normally.
+    const { diagnostics, ast } = parseJsonc('{"key": "value"}');
+    expect(diagnostics).toEqual([]);
+    expect(ast.root?.kind).toBe("object");
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonc/resolve.test.ts

@@ -0,0 +1,87 @@
+// OC Path tests cover resolve plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { resolveJsoncOcPath } from "../../jsonc/resolve.js";
+import { parseOcPath } from "../../oc-path.js";
+
+function rs(raw: string, ocPath: string) {
+  const { ast } = parseJsonc(raw);
+  const path = parseOcPath(ocPath);
+  return resolveJsoncOcPath(ast, path);
+}
+
+describe("resolveJsoncOcPath", () => {
+  const config = `{
+  "plugins": {
+    "entries": {
+      "github": {
+        "token": "secret",
+        "enabled": true
+      }
+    }
+  },
+  "limits": [10, 20, 30]
+}`;
+
+  it("resolves the root when no segments are given", () => {
+    const m = rs(config, "oc://config");
+    expect(m?.kind).toBe("root");
+  });
+
+  it("walks dotted section paths", () => {
+    const m = rs(config, "oc://config/plugins.entries.github.token");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.key).toBe("token");
+      expect(m.node.value.kind).toBe("string");
+      if (m.node.value.kind === "string") {
+        expect(m.node.value.value).toBe("secret");
+      }
+    }
+  });
+
+  it("walks 4-segment slash paths up to OcPath depth limit", () => {
+    const m = rs(config, "oc://config/plugins/entries/github");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.key).toBe("github");
+    }
+  });
+
+  it("walks mixed dotted+slash paths", () => {
+    const m = rs(config, "oc://config/plugins/entries.github.token");
+    expect(m?.kind).toBe("object-entry");
+  });
+
+  it("indexes into arrays via numeric segments", () => {
+    const m = rs(config, "oc://config/limits.1");
+    expect(m?.kind).toBe("value");
+    if (m?.kind === "value") {
+      expect(m.node.kind).toBe("number");
+      if (m.node.kind === "number") {
+        expect(m.node.value).toBe(20);
+      }
+    }
+  });
+
+  it("returns null for missing keys", () => {
+    expect(rs(config, "oc://config/plugins.entries.gitlab")).toBeNull();
+  });
+
+  it("returns null for out-of-bounds array indexes", () => {
+    expect(rs(config, "oc://config/limits.99")).toBeNull();
+  });
+
+  it("returns null for noncanonical array indexes", () => {
+    expect(rs(config, "oc://config/limits.01")).toBeNull();
+  });
+
+  it("returns null when descending past a primitive", () => {
+    expect(rs(config, "oc://config/plugins.entries.github.token.x")).toBeNull();
+  });
+
+  it("returns null on empty AST", () => {
+    const { ast } = parseJsonc("");
+    expect(resolveJsoncOcPath(ast, parseOcPath("oc://config/x"))).toBeNull();
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonl/edit.test.ts

@@ -0,0 +1,169 @@
+// OC Path tests cover edit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { appendJsonlOcPath, setJsonlOcPath } from "../../jsonl/edit.js";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { parseOcPath } from "../../oc-path.js";
+
+describe("setJsonlOcPath — value replacement", () => {
+  const log = '{"event":"start"}\n{"event":"step","n":1}\n{"event":"end"}\n';
+
+  it("replaces a field on a specific line", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/L2/n"), {
+      kind: "number",
+      value: 42,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const lines = emitJsonl(r.ast).split("\n");
+      expect(JSON.parse(lines[1] ?? "")).toEqual({ event: "step", n: 42 });
+    }
+  });
+
+  it("replaces an entire line value", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/L2"), {
+      kind: "object",
+      entries: [{ key: "event", line: 0, value: { kind: "string", value: "replaced" } }],
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const lines = emitJsonl(r.ast).split("\n");
+      expect(JSON.parse(lines[1] ?? "")).toEqual({ event: "replaced" });
+    }
+  });
+
+  it("resolves $last and edits the most recent value line", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/$last/event"), {
+      kind: "string",
+      value: "final",
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const lines = emitJsonl(r.ast).split("\n");
+      expect(JSON.parse(lines[2] ?? "")).toEqual({ event: "final" });
+    }
+  });
+
+  it("reports unresolved for unknown line addresses", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/L99/x"), {
+      kind: "number",
+      value: 1,
+    });
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+
+  it("reports not-a-value-line when targeting a blank line", () => {
+    const { ast } = parseJsonl('{"a":1}\n\n{"b":2}\n');
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/L2"), {
+      kind: "number",
+      value: 1,
+    });
+    expect(r).toEqual({ ok: false, reason: "not-a-value-line" });
+  });
+});
+
+describe("appendJsonlOcPath — session checkpointing primitive", () => {
+  it("appends to an empty file", () => {
+    const { ast } = parseJsonl("");
+    const next = appendJsonlOcPath(ast, {
+      kind: "object",
+      entries: [{ key: "event", line: 0, value: { kind: "string", value: "start" } }],
+    });
+    expect(emitJsonl(next)).toBe('{"event":"start"}');
+  });
+
+  it("appends to an existing log preserving prior lines", () => {
+    const { ast } = parseJsonl('{"a":1}\n');
+    const next = appendJsonlOcPath(ast, {
+      kind: "object",
+      entries: [{ key: "b", line: 0, value: { kind: "number", value: 2 } }],
+    });
+    const out = emitJsonl(next).split("\n");
+    expect(out).toHaveLength(2);
+    expect(JSON.parse(out[1] ?? "")).toEqual({ b: 2 });
+  });
+
+  it("preserves CRLF line endings when appending", () => {
+    const { ast } = parseJsonl('{"a":1}\r\n');
+    const next = appendJsonlOcPath(ast, {
+      kind: "object",
+      entries: [{ key: "b", line: 0, value: { kind: "number", value: 2 } }],
+    });
+    expect(emitJsonl(next)).toBe('{"a":1}\r\n{"b":2}');
+  });
+});
+
+describe("setJsonlOcPath — $last line address", () => {
+  const log = '{"event":"start","n":1}\n{"event":"step","n":2}\n{"event":"end","n":3}\n';
+
+  it("writes under $last line address", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/$last/n"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const lines = emitJsonl(r.ast).split("\n");
+      expect(JSON.parse(lines[2] ?? "")).toEqual({ event: "end", n: 99 });
+    }
+  });
+
+  it("reports unresolved for $last against an empty log", () => {
+    const { ast } = parseJsonl("");
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/$last/n"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r).toEqual({ ok: false, reason: "unresolved" });
+  });
+});
+
+describe("setJsonlOcPath — $last positional field tokens", () => {
+  const log = '{"items":[10,20,30],"events":{"a":1,"b":2}}\n';
+
+  it("edits the last array item on a line via $last", () => {
+    const { ast } = parseJsonl(log);
+    const r = setJsonlOcPath(ast, parseOcPath("oc://session-events/L1/items/$last"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const firstLine =
+        emitJsonl(r.ast)
+          .split("\n")
+          .find((l) => l.length > 0) ?? "";
+      expect(JSON.parse(firstLine)).toEqual({
+        items: [10, 20, 99],
+        events: { a: 1, b: 2 },
+      });
+    }
+  });
+});
+
+describe("setJsonlOcPath — quoted field segments", () => {
+  it("edits a field key containing a slash via quoted segment", () => {
+    const raw = `{"event":"start","detail":{"github/repo":"old"}}\n`;
+    const { ast } = parseJsonl(raw);
+    const r = setJsonlOcPath(ast, parseOcPath('oc://x.jsonl/L1/detail/"github/repo"'), {
+      kind: "string",
+      value: "new",
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const lines = emitJsonl(r.ast)
+        .split("\n")
+        .filter((l) => l.length > 0);
+      expect(lines).toHaveLength(1);
+      expect(JSON.parse(lines[0] ?? "")).toEqual({
+        event: "start",
+        detail: { "github/repo": "new" },
+      });
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonl/emit.test.ts

@@ -0,0 +1,95 @@
+// OC Path tests cover emit plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../../sentinel.js";
+
+describe("emitJsonl — round-trip", () => {
+  it("returns raw bytes verbatim by default", () => {
+    const raw = '{"a":1}\n\n{"b":2}\nthis is malformed\n';
+    const { ast } = parseJsonl(raw);
+    expect(emitJsonl(ast)).toBe(raw);
+  });
+
+  it("echoes pre-existing sentinel bytes by default; strict mode rejects", () => {
+    const raw = `{"a":"${REDACTED_SENTINEL}"}\n`;
+    const { ast } = parseJsonl(raw);
+    expect(emitJsonl(ast)).toBe(raw);
+    expect(() =>
+      emitJsonl(ast, {
+        fileNameForGuard: "session-events",
+        acceptPreExistingSentinel: false,
+      }),
+    ).toThrow(OcEmitSentinelError);
+  });
+});
+
+describe("emitJsonl — render mode", () => {
+  it("rebuilds value lines via JSON-stringify", () => {
+    const { ast } = parseJsonl('{"a":1}\n{"b":2}\n');
+    const out = emitJsonl(ast, { mode: "render" });
+    expect(out.split("\n")).toEqual(['{"a":1}', '{"b":2}']);
+  });
+
+  it("preserves blank and malformed lines verbatim in render mode", () => {
+    const { ast } = parseJsonl('{"a":1}\n\nbroken\n{"b":2}\n');
+    const out = emitJsonl(ast, { mode: "render" });
+    expect(out.split("\n")).toEqual(['{"a":1}', "", "broken", '{"b":2}']);
+  });
+
+  it("throws when a value-leaf is the sentinel under render mode", () => {
+    const ast = parseJsonl('{"a":"ok"}\n').ast;
+    const tampered = {
+      ...ast,
+      lines: [
+        {
+          kind: "value" as const,
+          line: 1,
+          raw: '{"a":"ok"}',
+          value: {
+            kind: "object" as const,
+            entries: [
+              {
+                key: "a",
+                line: 1,
+                value: { kind: "string" as const, value: REDACTED_SENTINEL },
+              },
+            ],
+          },
+        },
+      ],
+    };
+    expect(() => emitJsonl(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("throws when a value-leaf EMBEDS the sentinel (prefix/suffix wrap)", () => {
+    // Regression: prior to this fix, render mode used exact-match
+    // (`value.value === SENTINEL`), so `prefix__OPENCLAW_REDACTED__suffix`
+    // slipped through. The contains-check is the right invariant.
+    const ast = parseJsonl('{"a":"ok"}\n').ast;
+    const tampered = {
+      ...ast,
+      lines: [
+        {
+          kind: "value" as const,
+          line: 1,
+          raw: '{"a":"ok"}',
+          value: {
+            kind: "object" as const,
+            entries: [
+              {
+                key: "a",
+                line: 1,
+                value: {
+                  kind: "string" as const,
+                  value: `wrap-${REDACTED_SENTINEL}-end`,
+                },
+              },
+            ],
+          },
+        },
+      ],
+    };
+    expect(() => emitJsonl(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonl/parse.test.ts

@@ -0,0 +1,44 @@
+// OC Path tests cover parse plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseJsonl } from "../../jsonl/parse.js";
+
+describe("parseJsonl", () => {
+  it("parses an empty file as zero lines", () => {
+    const { ast, diagnostics } = parseJsonl("");
+    expect(diagnostics).toEqual([]);
+    expect(ast.lines).toEqual([]);
+  });
+
+  it("parses each line as a JSON value", () => {
+    const raw = `{"event":"start"}
+{"event":"step","n":1}
+{"event":"end"}
+`;
+    const { ast, diagnostics } = parseJsonl(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.lines).toHaveLength(3);
+    expect(ast.lines[0]?.kind).toBe("value");
+    expect(ast.lines[2]?.kind).toBe("value");
+  });
+
+  it("preserves blank lines as blank entries", () => {
+    const raw = '{"a":1}\n\n{"b":2}\n';
+    const { ast, diagnostics } = parseJsonl(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.lines.map((l) => l.kind)).toEqual(["value", "blank", "value"]);
+  });
+
+  it("flags malformed lines as warnings without aborting", () => {
+    const raw = '{"a":1}\nthis is not json\n{"b":2}\n';
+    const { ast, diagnostics } = parseJsonl(raw);
+    expect(ast.lines.map((l) => l.kind)).toEqual(["value", "malformed", "value"]);
+    expect(diagnostics).toHaveLength(1);
+    expect(diagnostics[0]?.code).toBe("OC_JSONL_LINE_MALFORMED");
+  });
+
+  it("preserves raw on the AST root for byte-fidelity emit", () => {
+    const raw = '{"a":1}\n{"b":2}\n';
+    const { ast } = parseJsonl(raw);
+    expect(ast.raw).toBe(raw);
+  });
+});

extensions/oc-path/src/oc-path/tests/jsonl/resolve.test.ts

@@ -0,0 +1,113 @@
+// OC Path tests cover resolve plugin behavior.
+import { describe, expect, it } from "vitest";
+import { findOcPaths } from "../../find.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { resolveJsonlOcPath } from "../../jsonl/resolve.js";
+import { parseOcPath } from "../../oc-path.js";
+import { resolveOcPath } from "../../universal.js";
+
+const log = `{"event":"start","ts":1}
+{"event":"step","n":1,"result":{"ok":true,"detail":"a"}}
+
+{"event":"end","ts":99}
+`;
+
+function rs(ocPath: string) {
+  const { ast } = parseJsonl(log);
+  return resolveJsonlOcPath(ast, parseOcPath(ocPath));
+}
+
+describe("resolveJsonlOcPath", () => {
+  it("returns root when no segments are given", () => {
+    expect(rs("oc://session-events")?.kind).toBe("root");
+  });
+
+  it("addresses an entire line by line number", () => {
+    const m = rs("oc://session-events/L1");
+    expect(m?.kind).toBe("line");
+  });
+
+  it("addresses fields under a line via item segment", () => {
+    const m = rs("oc://session-events/L2/event");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.value.kind).toBe("string");
+      if (m.node.value.kind === "string") {
+        expect(m.node.value.value).toBe("step");
+      }
+    }
+  });
+
+  it("descends via dotted item paths", () => {
+    const m = rs("oc://session-events/L2/result.ok");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.value.kind).toBe("boolean");
+      if (m.node.value.kind === "boolean") {
+        expect(m.node.value.value).toBe(true);
+      }
+    }
+  });
+
+  it("resolves $last to the most recent value line", () => {
+    const m = rs("oc://session-events/$last/event");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.value.kind).toBe("string");
+      if (m.node.value.kind === "string") {
+        expect(m.node.value.value).toBe("end");
+      }
+    }
+  });
+
+  it("returns null for unknown line addresses", () => {
+    expect(rs("oc://session-events/L99")).toBeNull();
+    expect(rs("oc://session-events/garbage")).toBeNull();
+  });
+
+  it("returns null when descending into a blank line", () => {
+    expect(rs("oc://session-events/L3/anything")).toBeNull();
+  });
+});
+
+describe("resolveJsonlToUniversal — file-relative line metadata (regression)", () => {
+  // Regression: surfaced via the openclaw-path CLI scenario run on
+  // a multi-line session.jsonl. Every match returned `line: 1`
+  // because the inside-line jsonc parser numbers from 1 within each
+  // line's bytes; the universal resolve was preferring that local
+  // number over the JsonlLine's file-relative line.
+
+  const logLocal = [
+    '{"event":"start"}', // line 1
+    '{"event":"step","n":1}', // line 2
+    '{"event":"step","n":2}', // line 3
+    '{"event":"end"}', // line 4
+    "", // line 5 (blank)
+  ].join("\n");
+
+  it("resolves L2/event with line=2 (not 1)", () => {
+    const { ast } = parseJsonl(logLocal);
+    const m = resolveOcPath(ast, parseOcPath("oc://session.jsonl/L2/event"));
+    if (m === null) {
+      throw new Error("expected L2/event match");
+    }
+    expect(m.line).toBe(2);
+  });
+
+  it("resolves L4/event with line=4", () => {
+    const { ast } = parseJsonl(logLocal);
+    const m = resolveOcPath(ast, parseOcPath("oc://session.jsonl/L4/event"));
+    if (m === null) {
+      throw new Error("expected L4/event match");
+    }
+    expect(m.line).toBe(4);
+  });
+
+  it("findOcPaths over wildcard surfaces correct file-relative lines", () => {
+    const { ast } = parseJsonl(logLocal);
+    const matches = findOcPaths(ast, parseOcPath("oc://session.jsonl/*/event"));
+    expect(matches).toHaveLength(4);
+    const lines = matches.map((m) => m.match.line);
+    expect(lines).toEqual([1, 2, 3, 4]);
+  });
+});

extensions/oc-path/src/oc-path/tests/oc-path.test.ts

@@ -0,0 +1,164 @@
+// OC Path tests cover oc path plugin behavior.
+import { describe, expect, it } from "vitest";
+import { OcPathError, formatOcPath, isValidOcPath, parseOcPath } from "../oc-path.js";
+
+describe("parseOcPath", () => {
+  it("parses file-only path", () => {
+    expect(parseOcPath("oc://SOUL.md")).toEqual({ file: "SOUL.md" });
+  });
+
+  it("parses file + section", () => {
+    expect(parseOcPath("oc://SOUL.md/Boundaries")).toEqual({
+      file: "SOUL.md",
+      section: "Boundaries",
+    });
+  });
+
+  it("parses file + section + item", () => {
+    expect(parseOcPath("oc://SOUL.md/Boundaries/deny-rule-1")).toEqual({
+      file: "SOUL.md",
+      section: "Boundaries",
+      item: "deny-rule-1",
+    });
+  });
+
+  it("parses file + section + item + field", () => {
+    expect(parseOcPath("oc://SOUL.md/Boundaries/deny-rule-1/risk")).toEqual({
+      file: "SOUL.md",
+      section: "Boundaries",
+      item: "deny-rule-1",
+      field: "risk",
+    });
+  });
+
+  it("parses session query", () => {
+    expect(parseOcPath("oc://SOUL.md?session=daily-cron")).toEqual({
+      file: "SOUL.md",
+      session: "daily-cron",
+    });
+  });
+
+  it("rejects reserved chars in session query values", () => {
+    expectOcPathError(
+      () => parseOcPath("oc://SOUL.md?session=cron%2Fdaily"),
+      "OC_PATH_RESERVED_CHAR",
+    );
+  });
+
+  it("rejects control chars in session query values", () => {
+    expectOcPathError(
+      () => parseOcPath("oc://SOUL.md?session=daily\x00cron"),
+      "OC_PATH_CONTROL_CHAR",
+    );
+  });
+
+  it("rejects control chars in ignored query values", () => {
+    expectOcPathError(() => parseOcPath("oc://SOUL.md?ignored=\x00"), "OC_PATH_CONTROL_CHAR");
+  });
+
+  it("rejects missing scheme", () => {
+    expectOcPathError(() => parseOcPath("SOUL.md"), "OC_PATH_MISSING_SCHEME");
+  });
+
+  it("rejects empty path after scheme", () => {
+    expectOcPathError(() => parseOcPath("oc://"), "OC_PATH_EMPTY");
+  });
+
+  it("rejects empty segment", () => {
+    expectOcPathError(() => parseOcPath("oc://SOUL.md//deny-rule-1"), "OC_PATH_EMPTY_SEGMENT");
+  });
+
+  it("rejects too-deep nesting", () => {
+    expectOcPathError(() => parseOcPath("oc://SOUL.md/a/b/c/d/e"), "OC_PATH_TOO_DEEP");
+  });
+
+  it("normalizes deep JSON paths into dotted subsegments", () => {
+    expect(parseOcPath("oc://openclaw.json/agents/list/8/tools/exec/security")).toEqual({
+      file: "openclaw.json",
+      section: "agents.list.8.tools",
+      item: "exec",
+      field: "security",
+    });
+  });
+
+  it("rejects non-string input", () => {
+    expectOcPathError(() => parseOcPath(123 as unknown as string), "OC_PATH_NOT_STRING");
+  });
+});
+
+function expectOcPathError(fn: () => unknown, expectedCode: string): void {
+  try {
+    fn();
+    expect.fail(`expected OcPathError with code "${expectedCode}" but no error thrown`);
+  } catch (err) {
+    expect(err).toBeInstanceOf(OcPathError);
+    expect((err as OcPathError).code).toBe(expectedCode);
+  }
+}
+
+describe("formatOcPath", () => {
+  it("round-trips file-only", () => {
+    expect(formatOcPath({ file: "SOUL.md" })).toBe("oc://SOUL.md");
+  });
+
+  it("round-trips full nesting", () => {
+    expect(
+      formatOcPath({
+        file: "SOUL.md",
+        section: "Boundaries",
+        item: "deny-rule-1",
+        field: "risk",
+      }),
+    ).toBe("oc://SOUL.md/Boundaries/deny-rule-1/risk");
+  });
+
+  it("round-trips session", () => {
+    expect(formatOcPath({ file: "SOUL.md", session: "cron" })).toBe("oc://SOUL.md?session=cron");
+  });
+
+  it("rejects reserved chars in formatted session values", () => {
+    expectOcPathError(
+      () => formatOcPath({ file: "SOUL.md", session: "cron&scope=daily" }),
+      "OC_PATH_RESERVED_CHAR",
+    );
+  });
+
+  it("rejects empty file", () => {
+    expectOcPathError(() => formatOcPath({ file: "" }), "OC_PATH_FILE_REQUIRED");
+  });
+
+  it("rejects item without section", () => {
+    expectOcPathError(() => formatOcPath({ file: "F.md", item: "i" }), "OC_PATH_NESTING");
+  });
+});
+
+describe("round-trip", () => {
+  const cases = [
+    "oc://SOUL.md",
+    "oc://SOUL.md/Boundaries",
+    "oc://SOUL.md/Boundaries/deny-rule-1",
+    "oc://SOUL.md/Boundaries/deny-rule-1/risk",
+    "oc://SOUL.md?session=daily",
+    "oc://AGENTS.md/Tools/gh/risk",
+  ];
+  for (const input of cases) {
+    it(`formatOcPath(parseOcPath("${input}")) === "${input}"`, () => {
+      expect(formatOcPath(parseOcPath(input))).toBe(input);
+    });
+  }
+});
+
+describe("isValidOcPath", () => {
+  it("returns true for valid paths", () => {
+    expect(isValidOcPath("oc://SOUL.md")).toBe(true);
+    expect(isValidOcPath("oc://SOUL.md/Boundaries")).toBe(true);
+  });
+
+  it("returns false for invalid paths", () => {
+    expect(isValidOcPath("SOUL.md")).toBe(false);
+    expect(isValidOcPath("oc://")).toBe(false);
+    expect(isValidOcPath(null)).toBe(false);
+    expect(isValidOcPath(undefined)).toBe(false);
+    expect(isValidOcPath(42)).toBe(false);
+  });
+});

extensions/oc-path/src/oc-path/tests/parse.test.ts

@@ -0,0 +1,164 @@
+// OC Path tests cover parse plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../parse.js";
+
+describe("parseMd — frontmatter", () => {
+  it("parses simple frontmatter", () => {
+    const raw = `---
+name: github
+description: gh CLI for issues, PRs, runs
+---
+
+Body text.
+`;
+    const { ast, diagnostics } = parseMd(raw);
+    expect(diagnostics).toEqual([]);
+    expect(ast.frontmatter).toEqual([
+      { key: "name", value: "github", line: 2 },
+      { key: "description", value: "gh CLI for issues, PRs, runs", line: 3 },
+    ]);
+  });
+
+  it("handles no frontmatter", () => {
+    const raw = `## First section\n\nContent.\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.frontmatter).toEqual([]);
+    expect(ast.preamble).toBe("");
+    expect(ast.blocks.length).toBe(1);
+  });
+
+  it("emits diagnostic for unclosed frontmatter", () => {
+    const raw = `---
+name: github
+description: never closes
+
+Body.
+`;
+    const { diagnostics } = parseMd(raw);
+    expect(diagnostics).toStrictEqual([
+      {
+        line: 1,
+        message: "frontmatter opens with --- but never closes",
+        severity: "warning",
+        code: "OC_FRONTMATTER_UNCLOSED",
+      },
+    ]);
+  });
+
+  it("strips quotes from values", () => {
+    const raw = `---
+title: "Hello world"
+hint: 'quoted'
+---
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.frontmatter[0]?.value).toBe("Hello world");
+    expect(ast.frontmatter[1]?.value).toBe("quoted");
+  });
+});
+
+describe("parseMd — H2 blocks", () => {
+  it("splits sections", () => {
+    const raw = `Preamble text.
+
+## First
+
+Body of first.
+
+## Second
+
+Body of second.
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.preamble.trim()).toBe("Preamble text.");
+    expect(ast.blocks.length).toBe(2);
+    expect(ast.blocks[0]?.heading).toBe("First");
+    expect(ast.blocks[0]?.slug).toBe("first");
+    expect(ast.blocks[1]?.heading).toBe("Second");
+  });
+
+  it("preserves line numbers (1-based)", () => {
+    const raw = `Line 1
+## Heading at line 2
+Line 3
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.line).toBe(2);
+  });
+
+  it("does NOT split on `## ` inside fenced code blocks", () => {
+    const raw = `## Real section
+
+\`\`\`md
+## Not a heading
+content
+\`\`\`
+
+## Another section
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["Real section", "Another section"]);
+  });
+});
+
+describe("parseMd — items", () => {
+  it("extracts plain bullet items", () => {
+    const raw = `## Boundaries
+
+- never write to /etc
+- always confirm before deleting
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.items.length).toBe(2);
+    expect(ast.blocks[0]?.items[0]?.text).toBe("never write to /etc");
+    expect(ast.blocks[0]?.items[0]?.kv).toBeUndefined();
+  });
+
+  it("extracts kv items", () => {
+    const raw = `## Tools
+
+- gh: GitHub CLI
+- curl: HTTP client
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.items[0]?.kv).toEqual({ key: "gh", value: "GitHub CLI" });
+    expect(ast.blocks[0]?.items[0]?.slug).toBe("gh");
+    expect(ast.blocks[0]?.items[1]?.kv).toEqual({ key: "curl", value: "HTTP client" });
+  });
+
+  it("does NOT extract bullets inside fenced code", () => {
+    const raw = `## Section
+
+\`\`\`
+- not a bullet
+\`\`\`
+
+- real bullet
+`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.items.length).toBe(1);
+    expect(ast.blocks[0]?.items[0]?.text).toBe("real bullet");
+  });
+});
+
+describe("parseMd — byte-fidelity", () => {
+  it("preserves raw on the AST", () => {
+    const raw = `---\nname: x\n---\n\n## Sec\n\n- a\n- b\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.raw).toBe(raw);
+  });
+
+  it("preserves BOM in raw but ignores it for parsing", () => {
+    const raw = "## Heading\n";
+    const { ast } = parseMd(raw);
+    expect(ast.raw).toBe(raw);
+    expect(ast.blocks[0]?.heading).toBe("Heading");
+  });
+
+  it("handles CRLF line endings", () => {
+    const raw = "## Heading\r\n\r\n- item\r\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.heading).toBe("Heading");
+    expect(ast.blocks[0]?.items[0]?.text).toBe("item");
+  });
+});

extensions/oc-path/src/oc-path/tests/resolve.test.ts

@@ -0,0 +1,101 @@
+// OC Path tests cover resolve plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../parse.js";
+import { resolveMdOcPath as resolveOcPath } from "../resolve.js";
+
+const SAMPLE = `---
+name: github
+description: gh CLI
+---
+
+Preamble.
+
+## Boundaries
+
+- never write to /etc
+- deny: secrets
+
+## Tools
+
+- gh: GitHub CLI
+- curl: HTTP client
+`;
+
+describe("resolveOcPath", () => {
+  const { ast } = parseMd(SAMPLE);
+
+  it("resolves root", () => {
+    const m = resolveOcPath(ast, { file: "AGENTS.md" });
+    expect(m?.kind).toBe("root");
+  });
+
+  it("resolves block by slug", () => {
+    const m = resolveOcPath(ast, { file: "AGENTS.md", section: "boundaries" });
+    expect(m?.kind).toBe("block");
+    if (m?.kind === "block") {
+      expect(m.node.heading).toBe("Boundaries");
+    }
+  });
+
+  it("resolves item by slug", () => {
+    const m = resolveOcPath(ast, {
+      file: "AGENTS.md",
+      section: "tools",
+      item: "gh",
+    });
+    expect(m?.kind).toBe("item");
+    if (m?.kind === "item") {
+      expect(m.node.kv?.value).toBe("GitHub CLI");
+      expect(m.block.heading).toBe("Tools");
+    }
+  });
+
+  it("resolves item-field via kv", () => {
+    const m = resolveOcPath(ast, {
+      file: "AGENTS.md",
+      section: "tools",
+      item: "gh",
+      field: "gh",
+    });
+    expect(m?.kind).toBe("item-field");
+    if (m?.kind === "item-field") {
+      expect(m.value).toBe("GitHub CLI");
+    }
+  });
+
+  it("resolves frontmatter via [frontmatter] sentinel section", () => {
+    const m = resolveOcPath(ast, {
+      file: "AGENTS.md",
+      section: "[frontmatter]",
+      field: "name",
+    });
+    expect(m?.kind).toBe("frontmatter");
+    if (m?.kind === "frontmatter") {
+      expect(m.node.value).toBe("github");
+    }
+  });
+
+  it("returns null for unknown section", () => {
+    const m = resolveOcPath(ast, { file: "AGENTS.md", section: "nonexistent" });
+    expect(m).toBeNull();
+  });
+
+  it("returns null for unknown item", () => {
+    const m = resolveOcPath(ast, {
+      file: "AGENTS.md",
+      section: "tools",
+      item: "nonexistent",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("returns null for field on non-kv item", () => {
+    const m = resolveOcPath(ast, {
+      file: "AGENTS.md",
+      section: "boundaries",
+      item: "never-write-to-etc",
+      field: "risk",
+    });
+    expect(m).toBeNull();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/append-multi-agent.test.ts

@@ -0,0 +1,114 @@
+// OC Path tests cover append multi agent plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { JsoncValue } from "../../jsonc/ast.js";
+import { appendJsonlOcPath } from "../../jsonl/edit.js";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+
+function event(name: string, n: number): JsoncValue {
+  return {
+    kind: "object",
+    entries: [
+      { key: "event", line: 0, value: { kind: "string", value: name } },
+      { key: "n", line: 0, value: { kind: "number", value: n } },
+    ],
+  };
+}
+
+describe("jsonl append + multi-agent session sim", () => {
+  it("single agent appends 100 events in order", () => {
+    let ast = parseJsonl("").ast;
+    for (let i = 0; i < 100; i++) {
+      ast = appendJsonlOcPath(ast, event("step", i));
+    }
+    const lines = emitJsonl(ast)
+      .split("\n")
+      .filter((l) => l.length > 0);
+    expect(lines).toHaveLength(100);
+    expect(JSON.parse(lines[0] ?? "")).toEqual({ event: "step", n: 0 });
+    expect(JSON.parse(lines[99] ?? "")).toEqual({ event: "step", n: 99 });
+  });
+
+  it("two agents alternating appends preserve interleave order", () => {
+    let ast = parseJsonl("").ast;
+    for (let i = 0; i < 10; i++) {
+      const agent = i % 2 === 0 ? "a" : "b";
+      ast = appendJsonlOcPath(ast, event(agent, i));
+    }
+    const lines = emitJsonl(ast)
+      .split("\n")
+      .filter((l) => l.length > 0);
+    expect(lines).toHaveLength(10);
+    for (let i = 0; i < 10; i++) {
+      const expected = i % 2 === 0 ? "a" : "b";
+      expect(JSON.parse(lines[i] ?? "").event).toBe(expected);
+    }
+  });
+
+  it("append after a malformed line preserves both", () => {
+    let ast = parseJsonl('{"a":1}\nbroken\n').ast;
+    ast = appendJsonlOcPath(ast, event("start", 1));
+    const out = emitJsonl(ast);
+    expect(out).toContain("broken");
+    expect(out).toContain('"event":"start"');
+  });
+
+  it("append to empty file produces a single value line", () => {
+    let ast = parseJsonl("").ast;
+    ast = appendJsonlOcPath(ast, event("first", 0));
+    const out = emitJsonl(ast);
+    expect(JSON.parse(out)).toEqual({ event: "first", n: 0 });
+  });
+
+  it("append assigns line numbers monotonically", () => {
+    let ast = parseJsonl("").ast;
+    ast = appendJsonlOcPath(ast, event("a", 0));
+    ast = appendJsonlOcPath(ast, event("b", 1));
+    ast = appendJsonlOcPath(ast, event("c", 2));
+    expect(ast.lines.map((l) => l.line)).toEqual([1, 2, 3]);
+  });
+
+  it("append after blank lines preserves line-number gaps correctly", () => {
+    let ast = parseJsonl('{"a":1}\n\n\n').ast;
+    ast = appendJsonlOcPath(ast, event("after", 0));
+    // Existing lines: L1 value, L2 blank, L3 blank. Appended line is L4.
+    expect(ast.lines.length).toBe(4);
+    expect(ast.lines[3]?.line).toBe(4);
+  });
+
+  it("1000-event session sim is deterministic", () => {
+    let ast = parseJsonl("").ast;
+    for (let i = 0; i < 1000; i++) {
+      ast = appendJsonlOcPath(ast, event("e", i));
+    }
+    const lines = emitJsonl(ast)
+      .split("\n")
+      .filter((l) => l.length > 0);
+    expect(lines).toHaveLength(1000);
+    expect(JSON.parse(lines[999] ?? "").n).toBe(999);
+  });
+
+  it("append is non-mutating on the input AST", () => {
+    const ast = parseJsonl('{"a":1}\n').ast;
+    const before = JSON.stringify(ast);
+    appendJsonlOcPath(ast, event("x", 0));
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+
+  it("append preserves prior raw bytes (renders new tail)", () => {
+    let ast = parseJsonl('{"a":1}\n').ast;
+    ast = appendJsonlOcPath(ast, event("b", 1));
+    const out = emitJsonl(ast);
+    const lines = out.split("\n");
+    // First line content unchanged.
+    expect(lines[0]).toContain('"a":1');
+    // Second line is the new event.
+    expect(JSON.parse(lines[1] ?? "")).toEqual({ event: "b", n: 1 });
+  });
+
+  it("deterministic line-number assignment after malformed lines", () => {
+    let ast = parseJsonl('{"a":1}\nbroken\n{"b":2}\n').ast;
+    ast = appendJsonlOcPath(ast, event("c", 2));
+    expect(ast.lines.map((l) => l.line)).toEqual([1, 2, 3, 4]);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/byte-fidelity.test.ts

@@ -0,0 +1,174 @@
+// OC Path tests cover byte fidelity plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { parseMd } from "../../parse.js";
+
+function roundTrip(raw: string): string {
+  const { ast } = parseMd(raw);
+  return emitMd(ast);
+}
+
+describe("byte-fidelity", () => {
+  it("empty file", () => {
+    expect(roundTrip("")).toBe("");
+  });
+
+  it("whitespace-only file", () => {
+    expect(roundTrip("   \n\n   \n")).toBe("   \n\n   \n");
+  });
+
+  it("single newline", () => {
+    expect(roundTrip("\n")).toBe("\n");
+  });
+
+  it("file without trailing newline", () => {
+    expect(roundTrip("## H\n- item")).toBe("## H\n- item");
+  });
+
+  it("file with trailing newline", () => {
+    expect(roundTrip("## H\n- item\n")).toBe("## H\n- item\n");
+  });
+
+  it("file with multiple trailing newlines", () => {
+    expect(roundTrip("## H\n- item\n\n\n")).toBe("## H\n- item\n\n\n");
+  });
+
+  it("BOM at start", () => {
+    const raw = "## Heading\n- item\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("CRLF line endings", () => {
+    const raw = "## H\r\n\r\n- item\r\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("mixed line endings (CRLF + LF)", () => {
+    const raw = "## H\r\n- item\n- another\r\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("tabs preserved in body", () => {
+    const raw = "## H\n\n\tindented body\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("trailing whitespace on lines preserved", () => {
+    const raw = "## Heading   \n- item   \n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("multiple consecutive blank lines preserved", () => {
+    const raw = "## H\n\n\n\n- item\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("frontmatter only, no body", () => {
+    const raw = "---\nname: x\n---\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("body only, no frontmatter, no headings", () => {
+    const raw = "Just some prose.\nNo structure.\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("frontmatter + body + multiple sections", () => {
+    const raw = `---
+name: github
+description: gh CLI
+---
+
+Preamble.
+
+## Boundaries
+
+- never write to /etc
+
+## Tools
+
+- gh: GitHub CLI
+- curl: HTTP client
+`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("unicode content preserved", () => {
+    const raw = "## Café Section\n\n- résumé item\n- 日本語\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("emoji preserved", () => {
+    const raw = "## 🚀 Launch\n\n- ✅ ready\n- 🔒 secure\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("frontmatter with special chars in values", () => {
+    const raw = `---\nurl: https://example.com:443/path?q=1&a=2\n---\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("file with mixed bullet markers (-, *, +)", () => {
+    const raw = "## H\n\n- dash\n* star\n+ plus\n";
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("raw === parse(raw).raw === emitMd(parse(raw)) for 50 random shapes", () => {
+    const inputs = [
+      "",
+      "\n",
+      "## A\n",
+      "## A\n## B\n",
+      "---\n---\n",
+      "---\nk: v\n---\n",
+      "---\nk: v\n---\nbody\n",
+      "## H\n- a\n- b\n## I\n- c\n",
+      "\n",
+      "\r\n",
+      "\t\n",
+      "plain\n",
+      "`code`\n",
+      "```\nfence\n```\n",
+      "```ts\nconst x = 1;\n```\n",
+      "| a | b |\n| - | - |\n| 1 | 2 |\n",
+      "> quote\n",
+      "# H1 not split\n## H2 split\n",
+      "preamble\n## block\nbody\n",
+      "preamble\n## block\nbody\n## block2\nbody2\n",
+      "## h\n\n\n\n",
+      "   ## indented heading (not parsed)\n",
+      "##NoSpace\n",
+      "## With trailing spaces   \n- item\n",
+      "## H\n- nested\n  - sub\n",
+      "## H\n\n```md\n## inside code\n```\n",
+      "---\na: 1\nb: \"two\"\nc: 'three'\n---\n",
+      "---\nopen\nbut no close\n\nbody\n",
+      "mixed\r\nline\nendings\r\n",
+      "---\nname: bom\n---\nbody\n",
+      "## h\n- k: v\n- k2: v2\n- plain\n",
+      "## h\n\n| a | b |\n|---|---|\n",
+      "## h\n```sql\nSELECT 1\n```\n",
+      "## h\n\n- url: http://x.example.com:80/p?q=1\n",
+      "## h\n\n- key: value with: colons\n",
+      '## h\n\n- key: "quoted: value"\n',
+      "## h\n\n- a-b: c-d\n",
+      "## h with `inline code`\n",
+      "no blocks\nat all\n",
+      "No body or section\n\n\n\n",
+      "   \n   \n",
+      "## h\n## h2\n## h3\n",
+      "##\n", // empty heading
+      "##  \n", // heading whitespace only
+      "\n\n## h\n\n\n",
+      "---\n\n---\n",
+      "## h\n- \n", // empty bullet
+      "## h\n\n\n```\nempty fence body\n```\n",
+      "## h\n```\nunclosed fence",
+      "## empty section\n## next\n",
+      "0\n",
+    ];
+    for (const raw of inputs) {
+      expect(roundTrip(raw), `failed on: ${JSON.stringify(raw.slice(0, 60))}`).toBe(raw);
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/cross-cutting.test.ts

@@ -0,0 +1,135 @@
+// OC Path tests cover cross cutting plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { formatOcPath, parseOcPath } from "../../oc-path.js";
+import { parseMd } from "../../parse.js";
+import { resolveMdOcPath as resolveOcPath } from "../../resolve.js";
+
+const SAMPLE = `---
+name: github
+description: gh CLI
+---
+
+Preamble.
+
+## Boundaries
+
+- never write to /etc
+- always confirm
+
+## Tools
+
+- gh: GitHub CLI
+- curl: HTTP client
+`;
+
+describe("cross-cutting", () => {
+  it("parse → resolve → emit pipeline (block)", () => {
+    const { ast } = parseMd(SAMPLE);
+    const m = resolveOcPath(ast, { file: "AGENTS.md", section: "boundaries" });
+    expect(m?.kind).toBe("block");
+    expect(emitMd(ast)).toBe(SAMPLE);
+  });
+
+  it("OcPath round-trip via AST: parse + resolve + format", () => {
+    const { ast } = parseMd(SAMPLE);
+    for (const block of ast.blocks) {
+      const path = parseOcPath(`oc://AGENTS.md/${block.slug}`);
+      const m = resolveOcPath(ast, path);
+      expect(m?.kind, `block ${block.slug} should resolve`).toBe("block");
+      // Format the same path back; slug → URI shape should be stable.
+      expect(formatOcPath(path)).toBe(`oc://AGENTS.md/${block.slug}`);
+    }
+  });
+
+  it("every item in every block is OcPath-addressable", () => {
+    const { ast } = parseMd(SAMPLE);
+    for (const block of ast.blocks) {
+      for (const item of block.items) {
+        const path = parseOcPath(`oc://AGENTS.md/${block.slug}/${item.slug}`);
+        const m = resolveOcPath(ast, path);
+        expect(m?.kind, `${block.slug}/${item.slug} should resolve`).toBe("item");
+      }
+    }
+  });
+
+  it("every kv item field is OcPath-addressable", () => {
+    const { ast } = parseMd(SAMPLE);
+    for (const block of ast.blocks) {
+      for (const item of block.items) {
+        if (!item.kv) {
+          continue;
+        }
+        const path = parseOcPath(`oc://AGENTS.md/${block.slug}/${item.slug}/${item.kv.key}`);
+        const m = resolveOcPath(ast, path);
+        expect(m?.kind).toBe("item-field");
+      }
+    }
+  });
+
+  it("every frontmatter entry is OcPath-addressable", () => {
+    const { ast } = parseMd(SAMPLE);
+    for (const fm of ast.frontmatter) {
+      const path = parseOcPath(`oc://AGENTS.md/[frontmatter]/${fm.key}`);
+      const m = resolveOcPath(ast, path);
+      expect(m?.kind).toBe("frontmatter");
+    }
+  });
+
+  it("slugs are stable across re-parses (deterministic)", () => {
+    const a1 = parseMd(SAMPLE).ast;
+    const a2 = parseMd(SAMPLE).ast;
+    expect(a1.blocks.map((b) => b.slug)).toEqual(a2.blocks.map((b) => b.slug));
+    expect(a1.blocks.map((b) => b.items.map((i) => i.slug))).toEqual(
+      a2.blocks.map((b) => b.items.map((i) => i.slug)),
+    );
+  });
+
+  it("modifying raw + re-parse produces consistent AST shape", () => {
+    const a1 = parseMd(SAMPLE).ast;
+    const modified = SAMPLE.replace("GitHub CLI", "GitHub command-line interface");
+    const a2 = parseMd(modified).ast;
+    // Block + item count + slugs unchanged.
+    expect(a2.blocks.length).toBe(a1.blocks.length);
+    const a1Tools = a1.blocks.find((b) => b.slug === "tools");
+    const a2Tools = a2.blocks.find((b) => b.slug === "tools");
+    expect(a2Tools?.items.length).toBe(a1Tools?.items.length);
+    // KV value reflects the change.
+    const ghItem = a2Tools?.items.find((i) => i.kv?.key === "gh");
+    expect(ghItem?.kv?.value).toBe("GitHub command-line interface");
+  });
+
+  it("unknown OcPath returns null without affecting subsequent valid resolves", () => {
+    const { ast } = parseMd(SAMPLE);
+    expect(resolveOcPath(ast, { file: "X.md", section: "nonexistent" })).toBeNull();
+    expect(resolveOcPath(ast, { file: "X.md", section: "tools" })?.kind).toBe("block");
+  });
+
+  it("resolve does not depend on file segment matching", () => {
+    const { ast } = parseMd(SAMPLE);
+    const a = resolveOcPath(ast, { file: "A.md", section: "tools" });
+    const b = resolveOcPath(ast, { file: "B.md", section: "tools" });
+    expect(a?.kind).toBe(b?.kind);
+  });
+
+  it("round-trip across all 9 valid OcPath shapes", () => {
+    const { ast } = parseMd(SAMPLE);
+    const cases = [
+      { file: "X.md" },
+      { file: "X.md", section: "tools" },
+      { file: "X.md", section: "tools", item: "gh" },
+      { file: "X.md", section: "tools", item: "gh", field: "gh" },
+      { file: "X.md", section: "[frontmatter]", field: "name" },
+      { file: "X.md", section: "boundaries" },
+      { file: "X.md", section: "boundaries", item: "never-write-to-etc" },
+      { file: "X.md", section: "boundaries", item: "always-confirm" },
+      { file: "X.md", section: "[frontmatter]", field: "description" },
+    ];
+    for (const path of cases) {
+      const m = resolveOcPath(ast, path);
+      if (m === null) {
+        throw new Error(`failed for ${JSON.stringify(path)}`);
+      }
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/cross-kind-properties.test.ts

@@ -0,0 +1,138 @@
+// OC Path tests cover cross kind properties plugin behavior.
+import { describe, expect, it } from "vitest";
+import { inferKind } from "../../dispatch.js";
+import { setMdOcPath } from "../../edit.js";
+import { emitMd } from "../../emit.js";
+import { setJsoncOcPath } from "../../jsonc/edit.js";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { resolveJsoncOcPath } from "../../jsonc/resolve.js";
+import { setJsonlOcPath } from "../../jsonl/edit.js";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { resolveJsonlOcPath } from "../../jsonl/resolve.js";
+import { parseOcPath } from "../../oc-path.js";
+import { parseMd } from "../../parse.js";
+import { resolveMdOcPath } from "../../resolve.js";
+
+describe("cross-kind property invariants", () => {
+  const mdRaw = "---\nname: x\n---\n\n## Boundaries\n\n- enabled: true\n";
+  const jsoncRaw = '// h\n{ "k": 1, "n": [1,2,3] }\n';
+  const jsonlRaw = '{"a":1}\n\nbroken\n{"b":2}\n';
+
+  it("round-trip parse → emit is byte-stable across all kinds", () => {
+    expect(emitMd(parseMd(mdRaw).ast)).toBe(mdRaw);
+    expect(emitJsonc(parseJsonc(jsoncRaw).ast)).toBe(jsoncRaw);
+    expect(emitJsonl(parseJsonl(jsonlRaw).ast)).toBe(jsonlRaw);
+  });
+
+  it("resolve is non-mutating across all kinds", () => {
+    const md = parseMd(mdRaw).ast;
+    let before = JSON.stringify(md);
+    resolveMdOcPath(md, parseOcPath("oc://X/[frontmatter]/name"));
+    resolveMdOcPath(md, parseOcPath("oc://X/boundaries"));
+    expect(JSON.stringify(md)).toBe(before);
+
+    const jsonc = parseJsonc(jsoncRaw).ast;
+    before = JSON.stringify(jsonc);
+    resolveJsoncOcPath(jsonc, parseOcPath("oc://X/k"));
+    resolveJsoncOcPath(jsonc, parseOcPath("oc://X/n.0"));
+    expect(JSON.stringify(jsonc)).toBe(before);
+
+    const jsonl = parseJsonl(jsonlRaw).ast;
+    before = JSON.stringify(jsonl);
+    resolveJsonlOcPath(jsonl, parseOcPath("oc://X/L1"));
+    resolveJsonlOcPath(jsonl, parseOcPath("oc://X/$last"));
+    expect(JSON.stringify(jsonl)).toBe(before);
+  });
+
+  it("unresolvable set never throws across all kinds", () => {
+    const ocPath = parseOcPath("oc://X/totally.missing.path");
+    expect(() => setMdOcPath(parseMd(mdRaw).ast, ocPath, "x")).not.toThrow();
+    expect(() =>
+      setJsoncOcPath(parseJsonc(jsoncRaw).ast, ocPath, {
+        kind: "string",
+        value: "x",
+      }),
+    ).not.toThrow();
+    expect(() =>
+      setJsonlOcPath(parseJsonl(jsonlRaw).ast, ocPath, {
+        kind: "string",
+        value: "x",
+      }),
+    ).not.toThrow();
+  });
+
+  it("inferKind aligns with the parser actually used", () => {
+    expect(inferKind("AGENTS.md")).toBe("md");
+    expect(inferKind("SOUL.md")).toBe("md");
+    expect(inferKind("config.jsonc")).toBe("jsonc");
+    expect(inferKind("plugins.json")).toBe("jsonc");
+    expect(inferKind("events.jsonl")).toBe("jsonl");
+    expect(inferKind("audit.ndjson")).toBe("jsonl");
+  });
+
+  it("parse → emit → parse is fixpoint across all kinds", () => {
+    const md1 = emitMd(parseMd(mdRaw).ast);
+    const md2 = emitMd(parseMd(md1).ast);
+    expect(md1).toBe(md2);
+
+    const jc1 = emitJsonc(parseJsonc(jsoncRaw).ast);
+    const jc2 = emitJsonc(parseJsonc(jc1).ast);
+    expect(jc1).toBe(jc2);
+
+    const jl1 = emitJsonl(parseJsonl(jsonlRaw).ast);
+    const jl2 = emitJsonl(parseJsonl(jl1).ast);
+    expect(jl1).toBe(jl2);
+  });
+
+  it("hostile inputs do not throw at parse time across all kinds", () => {
+    const hostile = [
+      "\x00\x01\x02 binary garbage",
+      '{ "unclosed":',
+      "## heading without anything",
+      "\n\n\n\n\n",
+    ];
+    for (const raw of hostile) {
+      expect(() => parseMd(raw)).not.toThrow();
+      expect(() => parseJsonc(raw)).not.toThrow();
+      expect(() => parseJsonl(raw)).not.toThrow();
+    }
+  });
+
+  it("resolver returns null for paths past valid kinds (no throw)", () => {
+    const overlong = parseOcPath("oc://X/a/b/c.d.e.f.g.h");
+    expect(() => resolveMdOcPath(parseMd(mdRaw).ast, overlong)).not.toThrow();
+    expect(() => resolveJsoncOcPath(parseJsonc(jsoncRaw).ast, overlong)).not.toThrow();
+    expect(() => resolveJsonlOcPath(parseJsonl(jsonlRaw).ast, overlong)).not.toThrow();
+  });
+
+  it("set-then-resolve produces the value just written (jsonc)", () => {
+    const ast = parseJsonc('{ "k": 1 }').ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://X/k"), {
+      kind: "number",
+      value: 42,
+    });
+    if (r.ok) {
+      const m = resolveJsoncOcPath(r.ast, parseOcPath("oc://X/k"));
+      if (m?.kind === "object-entry") {
+        expect(m.node.value.kind).toBe("number");
+        if (m.node.value.kind === "number") {
+          expect(m.node.value.value).toBe(42);
+        }
+      }
+    }
+  });
+
+  it("verbs are deterministic — same input twice produces same output", () => {
+    expect(emitMd(parseMd(mdRaw).ast)).toBe(emitMd(parseMd(mdRaw).ast));
+    expect(emitJsonc(parseJsonc(jsoncRaw).ast)).toBe(emitJsonc(parseJsonc(jsoncRaw).ast));
+    expect(emitJsonl(parseJsonl(jsonlRaw).ast)).toBe(emitJsonl(parseJsonl(jsonlRaw).ast));
+  });
+
+  it("inferKind returns null for unknown extensions", () => {
+    expect(inferKind("binary.bin")).toBeNull();
+    expect(inferKind("no-ext")).toBeNull();
+    expect(inferKind("archive.tar.gz")).toBeNull();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/edit-emit-roundtrip.test.ts

@@ -0,0 +1,168 @@
+// OC Path tests cover edit emit roundtrip plugin behavior.
+import { describe, expect, it } from "vitest";
+import { setMdOcPath } from "../../edit.js";
+import { emitMd } from "../../emit.js";
+import { setJsoncOcPath } from "../../jsonc/edit.js";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { resolveJsoncOcPath } from "../../jsonc/resolve.js";
+import { setJsonlOcPath } from "../../jsonl/edit.js";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { parseOcPath } from "../../oc-path.js";
+import { parseMd } from "../../parse.js";
+
+describe("edit-then-emit round-trip", () => {
+  it("md frontmatter edit re-parses to the new value", () => {
+    const md = parseMd("---\nname: old\n---\n\n## Body\n").ast;
+    const r = setMdOcPath(md, parseOcPath("oc://AGENTS.md/[frontmatter]/name"), "new");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const reparsed = parseMd(r.ast.raw).ast;
+      expect(reparsed.frontmatter.find((e) => e.key === "name")?.value).toBe("new");
+    }
+  });
+
+  it("md item kv edit re-parses to the new value", () => {
+    const md = parseMd("## Boundaries\n\n- timeout: 5\n").ast;
+    const r = setMdOcPath(md, parseOcPath("oc://AGENTS.md/boundaries/timeout/timeout"), "60");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const reparsed = parseMd(emitMd(r.ast)).ast;
+      const block = reparsed.blocks.find((b) => b.slug === "boundaries");
+      expect(block?.items[0]?.kv?.value).toBe("60");
+    }
+  });
+
+  it("jsonc value edit re-parses to the new value", () => {
+    const ast = parseJsonc('{ "k": 1 }').ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/k"), {
+      kind: "number",
+      value: 42,
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({ k: 42 });
+    }
+  });
+
+  it("jsonc nested edit preserves untouched siblings", () => {
+    const ast = parseJsonc('{ "a": 1, "b": { "c": 2, "d": 3 }, "e": 4 }').ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/b.c"), {
+      kind: "number",
+      value: 99,
+    });
+    if (r.ok) {
+      expect(JSON.parse(emitJsonc(r.ast))).toEqual({
+        a: 1,
+        b: { c: 99, d: 3 },
+        e: 4,
+      });
+    }
+  });
+
+  it("jsonl line edit re-parses to the new value at the same line", () => {
+    const ast = parseJsonl('{"a":1}\n{"a":2}\n{"a":3}\n').ast;
+    const r = setJsonlOcPath(ast, parseOcPath("oc://log/L2/a"), {
+      kind: "number",
+      value: 99,
+    });
+    if (r.ok) {
+      const reparsed = parseJsonl(emitJsonl(r.ast)).ast;
+      const line2 = reparsed.lines[1];
+      expect(line2?.kind).toBe("value");
+      if (line2?.kind === "value" && line2.value.kind === "object") {
+        const entry = line2.value.entries.find((e) => e.key === "a");
+        expect(entry?.value.kind).toBe("number");
+        if (entry?.value.kind === "number") {
+          expect(entry.value.value).toBe(99);
+        }
+      }
+    }
+  });
+
+  it("jsonc edit composes: two sequential edits both land", () => {
+    let ast = parseJsonc('{ "a": 1, "b": 2 }').ast;
+    let r = setJsoncOcPath(ast, parseOcPath("oc://config/a"), {
+      kind: "number",
+      value: 10,
+    });
+    if (r.ok) {
+      ast = r.ast;
+    }
+    r = setJsoncOcPath(ast, parseOcPath("oc://config/b"), {
+      kind: "number",
+      value: 20,
+    });
+    if (r.ok) {
+      ast = r.ast;
+    }
+    expect(JSON.parse(emitJsonc(ast))).toEqual({ a: 10, b: 20 });
+  });
+
+  it("missing path returns structured failure (not throw)", () => {
+    const ast = parseJsonc('{ "a": 1 }').ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/missing"), {
+      kind: "number",
+      value: 99,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+
+  it("each per-kind verb takes its own AST type — no cross-kind leakage", () => {
+    // Type-level guarantee: each setter only accepts its kind's AST.
+    // Caller picks based on the AST they have. This is the design.
+    const md = parseMd("---\nx: 1\n---\n").ast;
+    const jsonc = parseJsonc('{"x":1}').ast;
+    const jsonl = parseJsonl('{"x":1}\n').ast;
+
+    const a = setMdOcPath(md, parseOcPath("oc://X/[frontmatter]/x"), "2");
+    const b = setJsoncOcPath(jsonc, parseOcPath("oc://X/x"), {
+      kind: "number",
+      value: 2,
+    });
+    const c = setJsonlOcPath(jsonl, parseOcPath("oc://X/L1/x"), {
+      kind: "number",
+      value: 2,
+    });
+
+    expect(a.ok).toBe(true);
+    expect(b.ok).toBe(true);
+    expect(c.ok).toBe(true);
+  });
+
+  it("jsonc parser-backed edit preserves comments", () => {
+    const raw = '{\n  "k": 1 // comment\n}\n';
+    const ast = parseJsonc(raw).ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/k"), {
+      kind: "number",
+      value: 2,
+    });
+    if (r.ok) {
+      expect(emitJsonc(r.ast)).toContain("// comment");
+      const reparsed = resolveJsoncOcPath(r.ast, parseOcPath("oc://config/k"));
+      expect(reparsed?.kind).toBe("object-entry");
+      if (reparsed?.kind === "object-entry") {
+        expect(reparsed.node.value.kind).toBe("number");
+        if (reparsed.node.value.kind === "number") {
+          expect(reparsed.node.value.value).toBe(2);
+        }
+      }
+    }
+  });
+
+  it("edit on empty AST surfaces no-root", () => {
+    const ast = parseJsonc("").ast;
+    const r = setJsoncOcPath(ast, parseOcPath("oc://config/x"), {
+      kind: "number",
+      value: 1,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("no-root");
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/frontmatter-edges.test.ts

@@ -0,0 +1,133 @@
+// OC Path tests cover frontmatter edges plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../../parse.js";
+
+describe("frontmatter-edges", () => {
+  it("simple kv pairs", () => {
+    const { ast } = parseMd("---\nname: x\ndescription: y\n---\n");
+    expect(ast.frontmatter.map((e) => [e.key, e.value])).toEqual([
+      ["name", "x"],
+      ["description", "y"],
+    ]);
+  });
+
+  it("unclosed frontmatter emits diagnostic, treats as preamble", () => {
+    const { ast, diagnostics } = parseMd("---\nname: x\nno close fence\nbody\n");
+    expect(diagnostics.some((d) => d.code === "OC_FRONTMATTER_UNCLOSED")).toBe(true);
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("empty frontmatter (just open + close)", () => {
+    const { ast } = parseMd("---\n---\n");
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("frontmatter only, file has no other content", () => {
+    const { ast } = parseMd("---\nk: v\n---\n");
+    expect(ast.frontmatter).toEqual([{ key: "k", value: "v", line: 2 }]);
+    expect(ast.preamble).toBe("");
+    expect(ast.blocks).toEqual([]);
+  });
+
+  it("double-quoted value", () => {
+    const { ast } = parseMd('---\ntitle: "Hello, world"\n---\n');
+    expect(ast.frontmatter[0]?.value).toBe("Hello, world");
+  });
+
+  it("single-quoted value", () => {
+    const { ast } = parseMd("---\ntitle: 'Hello, world'\n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("Hello, world");
+  });
+
+  it("unquoted value with internal colons preserved", () => {
+    const { ast } = parseMd("---\nurl: https://example.com:443/p\n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("https://example.com:443/p");
+  });
+
+  it("empty value", () => {
+    const { ast } = parseMd("---\nk:\n---\n");
+    expect(ast.frontmatter[0]).toEqual({ key: "k", value: "", line: 2 });
+  });
+
+  it("value with leading/trailing whitespace trimmed", () => {
+    const { ast } = parseMd("---\nk:    spaced    \n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("spaced");
+  });
+
+  it("list-style continuations are silently dropped (substrate stays opinion-free)", () => {
+    const { ast } = parseMd("---\ntools:\n  - gh\n  - curl\n---\n");
+    // The `tools:` key has an empty inline value; the list continuation
+    // lines `  - gh` and `  - curl` don't match the kv regex and are
+    // skipped. Lint rules can do their own structural reading of
+    // frontmatter; the substrate does not.
+    expect(ast.frontmatter.map((e) => e.key)).toEqual(["tools"]);
+    expect(ast.frontmatter[0]?.value).toBe("");
+  });
+
+  it("line numbers are 1-based and accurate", () => {
+    const { ast } = parseMd("---\nk1: v1\nk2: v2\nk3: v3\n---\n");
+    expect(ast.frontmatter.map((e) => [e.key, e.line])).toEqual([
+      ["k1", 2],
+      ["k2", 3],
+      ["k3", 4],
+    ]);
+  });
+
+  it("dash-key allowed", () => {
+    const { ast } = parseMd("---\nuser-invocable: true\n---\n");
+    expect(ast.frontmatter[0]?.key).toBe("user-invocable");
+  });
+
+  it("underscore-key allowed", () => {
+    const { ast } = parseMd("---\nparam_set: foo\n---\n");
+    expect(ast.frontmatter[0]?.key).toBe("param_set");
+  });
+
+  it("number-only value preserved as string", () => {
+    const { ast } = parseMd("---\ntimeout: 15000\n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("15000");
+  });
+
+  it("boolean-like value preserved as string", () => {
+    const { ast } = parseMd("---\nenabled: true\n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("true");
+  });
+
+  it("blank lines inside frontmatter are skipped", () => {
+    const { ast } = parseMd("---\n\nk1: v1\n\nk2: v2\n\n---\n");
+    expect(ast.frontmatter.map((e) => e.key)).toEqual(["k1", "k2"]);
+  });
+
+  it("frontmatter with same key twice — both retained (no dedup)", () => {
+    const { ast } = parseMd("---\nk: v1\nk: v2\n---\n");
+    expect(ast.frontmatter).toEqual([
+      { key: "k", value: "v1", line: 2 },
+      { key: "k", value: "v2", line: 3 },
+    ]);
+  });
+
+  it("frontmatter must be at start — leading blank line breaks detection", () => {
+    const { ast } = parseMd("\n---\nk: v\n---\n");
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("frontmatter must be at start — leading text breaks detection", () => {
+    const { ast } = parseMd("intro\n\n---\nk: v\n---\n");
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("BOM before frontmatter open is tolerated", () => {
+    const { ast } = parseMd("---\nname: bom\n---\n");
+    expect(ast.frontmatter[0]?.value).toBe("bom");
+  });
+
+  it("single-line file with `---` and `---` is empty frontmatter", () => {
+    const { ast } = parseMd("---\n---");
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("hash-prefixed lines skipped (don't match kv regex)", () => {
+    const { ast } = parseMd("---\n# comment\nk: v\n---\n");
+    expect(ast.frontmatter.map((e) => e.key)).toEqual(["k"]);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/h2-block-split.test.ts

@@ -0,0 +1,131 @@
+// OC Path tests cover h2 block split plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../../parse.js";
+
+describe("h2-block-split", () => {
+  it("no headings → no blocks, all preamble", () => {
+    const raw = "Just prose, no headings.\nMore prose.\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks).toEqual([]);
+    expect(ast.preamble).toBe("Just prose, no headings.\nMore prose.\n");
+  });
+
+  it("single heading splits preamble + one block", () => {
+    const { ast } = parseMd("preamble\n## Section\nbody\n");
+    expect(ast.preamble.trim()).toBe("preamble");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("Section");
+    expect(ast.blocks[0]?.bodyText.trim()).toBe("body");
+  });
+
+  it("multiple headings produce blocks in order", () => {
+    const { ast } = parseMd("## A\nbody-a\n## B\nbody-b\n## C\nbody-c\n");
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["A", "B", "C"]);
+  });
+
+  it("H1 does NOT split", () => {
+    const { ast } = parseMd("# H1 heading\n## H2 heading\n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("H2 heading");
+    expect(ast.preamble).toContain("# H1 heading");
+  });
+
+  it("H3 does NOT split", () => {
+    const { ast } = parseMd("## H2\nbody\n### H3\nstill in H2 block\n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.bodyText).toContain("### H3");
+  });
+
+  it("`## ` inside fenced code block does NOT split", () => {
+    const raw = "## Real\n\n```md\n## Inside code\n```\n\n## Another real\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["Real", "Another real"]);
+  });
+
+  it("`##` without trailing space — does NOT match (regex requires \\s+)", () => {
+    const { ast } = parseMd("##NoSpace\n## With space\n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("With space");
+  });
+
+  it("leading whitespace before `##` — recognized as heading (CommonMark)", () => {
+    const { ast } = parseMd("   ## indented\n## not indented\n");
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["indented", "not indented"]);
+  });
+
+  it("trailing whitespace on heading — trimmed in heading text", () => {
+    const { ast } = parseMd("## Trailing   \n");
+    expect(ast.blocks[0]?.heading).toBe("Trailing");
+    expect(ast.blocks[0]?.slug).toBe("trailing");
+  });
+
+  it("inline code in heading preserved", () => {
+    const { ast } = parseMd("## Use `gh` for GitHub\n");
+    expect(ast.blocks[0]?.heading).toBe("Use `gh` for GitHub");
+  });
+
+  it("markdown formatting in heading preserved", () => {
+    const { ast } = parseMd("## **Bold** *italic*\n");
+    expect(ast.blocks[0]?.heading).toBe("**Bold** *italic*");
+  });
+
+  it("immediately after frontmatter", () => {
+    const { ast } = parseMd("---\nk: v\n---\n## Section\nbody\n");
+    expect(ast.blocks[0]?.heading).toBe("Section");
+    expect(ast.preamble).toBe("");
+  });
+
+  it("H2 at end of file (no body)", () => {
+    const { ast } = parseMd("preamble\n## End\n");
+    expect(ast.blocks[0]?.heading).toBe("End");
+    expect(ast.blocks[0]?.bodyText).toBe("");
+  });
+
+  it("two consecutive H2s — empty body block between", () => {
+    const { ast } = parseMd("## A\n## B\n");
+    expect(ast.blocks[0]?.bodyText).toBe("");
+    expect(ast.blocks[1]?.heading).toBe("B");
+  });
+
+  it("line numbers are 1-based and track through frontmatter", () => {
+    const { ast } = parseMd("---\nk: v\n---\n## At line 4\n");
+    expect(ast.blocks[0]?.line).toBe(4);
+  });
+
+  it("line numbers track through preamble", () => {
+    const { ast } = parseMd("line 1\nline 2\n## At line 3\n");
+    expect(ast.blocks[0]?.line).toBe(3);
+  });
+
+  it("nested fenced code blocks (~~~ vs ```) — only ``` is detected", () => {
+    const raw = "## H\n\n~~~md\n~~~\n\n## Next\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["H", "Next"]);
+  });
+
+  it("setext-style heading (`Heading\\n========\\n`) is NOT recognized", () => {
+    const raw = "Heading\n=======\n## Real\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("Real");
+  });
+
+  it("empty heading text (`## `)", () => {
+    const { ast } = parseMd("## \n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("");
+    expect(ast.blocks[0]?.slug).toBe("");
+  });
+
+  it("heading with only whitespace (`##    `)", () => {
+    const { ast } = parseMd("##    \n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("");
+  });
+
+  it("heading-shaped text inside multi-line bullet body — does split", () => {
+    const raw = "## Section\n- item starts\n  continues\n## Next\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["Section", "Next"]);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/items.test.ts

@@ -0,0 +1,134 @@
+// OC Path tests cover items plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../../parse.js";
+
+describe("items", () => {
+  it("plain dash bullets", () => {
+    const { ast } = parseMd("## H\n- a\n- b\n- c\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["a", "b", "c"]);
+  });
+
+  it("star bullets", () => {
+    const { ast } = parseMd("## H\n* a\n* b\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["a", "b"]);
+  });
+
+  it("plus bullets", () => {
+    const { ast } = parseMd("## H\n+ a\n+ b\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["a", "b"]);
+  });
+
+  it("mixed bullet markers in same section", () => {
+    const { ast } = parseMd("## H\n- dash\n* star\n+ plus\n");
+    expect(ast.blocks[0]?.items.length).toBe(3);
+  });
+
+  it("kv-shape items populate kv", () => {
+    const { ast } = parseMd("## H\n- gh: GitHub CLI\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toEqual({ key: "gh", value: "GitHub CLI" });
+  });
+
+  it("plain item has no kv", () => {
+    const { ast } = parseMd("## H\n- plain text\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toBeUndefined();
+  });
+
+  it("multiple colons — first colon is the kv split", () => {
+    const { ast } = parseMd("## H\n- url: http://x.com:80/p\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toEqual({
+      key: "url",
+      value: "http://x.com:80/p",
+    });
+  });
+
+  it("colon with no space after is still kv", () => {
+    const { ast } = parseMd("## H\n- key:value\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toEqual({ key: "key", value: "value" });
+  });
+
+  it("quoted value preserved verbatim (no unquote at item layer)", () => {
+    const { ast } = parseMd('## H\n- title: "quoted: value"\n');
+    expect(ast.blocks[0]?.items[0]?.kv?.value).toBe('"quoted: value"');
+  });
+
+  it("slug from kv key when kv present", () => {
+    const { ast } = parseMd("## H\n- The Tool: description\n");
+    expect(ast.blocks[0]?.items[0]?.slug).toBe("the-tool");
+  });
+
+  it("slug from item text when no kv", () => {
+    const { ast } = parseMd("## H\n- The Plain Item\n");
+    expect(ast.blocks[0]?.items[0]?.slug).toBe("the-plain-item");
+  });
+
+  it("items inside fenced code block are NOT extracted", () => {
+    const raw = "## H\n```\n- not a bullet\n- still not\n```\n- real bullet\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.items.length).toBe(1);
+    expect(ast.blocks[0]?.items[0]?.text).toBe("real bullet");
+  });
+
+  it("line numbers track through block body", () => {
+    const { ast } = parseMd("## H\n- first\n- second\n- third\n");
+    expect(ast.blocks[0]?.items.map((i) => i.line)).toEqual([2, 3, 4]);
+  });
+
+  it("trailing whitespace on bullet trimmed in text", () => {
+    const { ast } = parseMd("## H\n- spaced   \n");
+    expect(ast.blocks[0]?.items[0]?.text).toBe("spaced");
+  });
+
+  it("empty bullet — recognized with empty text/slug", () => {
+    const { ast } = parseMd("## H\n- \n- real\n");
+    expect(ast.blocks[0]?.items.length).toBe(2);
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["", "real"]);
+  });
+
+  it("indented bullet (sub-bullet) — recognized as item alongside parent", () => {
+    const { ast } = parseMd("## H\n- top\n  - sub\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["top", "sub"]);
+  });
+
+  it("numbered list (1. item) — recognized as items", () => {
+    const { ast } = parseMd("## H\n1. first\n2. second\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["first", "second"]);
+  });
+
+  it("items in a section with no body before — first item line is heading+1", () => {
+    const { ast } = parseMd("## H\n- a\n");
+    expect(ast.blocks[0]?.items[0]?.line).toBe(2);
+  });
+
+  it("items spread across blocks are scoped to their block", () => {
+    const { ast } = parseMd("## A\n- a1\n## B\n- b1\n- b2\n");
+    expect(ast.blocks[0]?.items.length).toBe(1);
+    expect(ast.blocks[1]?.items.length).toBe(2);
+    expect(ast.blocks[1]?.items.map((i) => i.text)).toEqual(["b1", "b2"]);
+  });
+
+  it("item with only-symbol kv key still parses", () => {
+    const { ast } = parseMd("## H\n- API_KEY: secret-value\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toEqual({
+      key: "API_KEY",
+      value: "secret-value",
+    });
+    expect(ast.blocks[0]?.items[0]?.slug).toBe("api-key");
+  });
+
+  it("item with empty kv value falls through to plain item", () => {
+    const { ast } = parseMd("## H\n- key:\n");
+    expect(ast.blocks[0]?.items[0]?.kv).toBeUndefined();
+    expect(ast.blocks[0]?.items[0]?.text).toBe("key:");
+  });
+
+  it("bullet in preamble (before first H2) is NOT in any block", () => {
+    const { ast } = parseMd("- preamble bullet\n## H\n- block bullet\n");
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["block bullet"]);
+    expect(ast.preamble).toContain("- preamble bullet");
+  });
+
+  it("bullet with internal markdown (italics, code) preserved in text", () => {
+    const { ast } = parseMd("## H\n- use *gh* and `curl`\n");
+    expect(ast.blocks[0]?.items[0]?.text).toBe("use *gh* and `curl`");
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/jsonc-byte-fidelity.test.ts

@@ -0,0 +1,175 @@
+// OC Path tests cover jsonc byte fidelity plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { JsoncValue } from "../../jsonc/ast.js";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+
+function rt(raw: string): string {
+  return emitJsonc(parseJsonc(raw).ast);
+}
+
+/**
+ * Verify the parser actually produced a structural tree (not just a
+ * `null` root with echoed `raw`). Without this, a parser that
+ * delegated everything to `raw` would pass the byte-fidelity test
+ * trivially. Returns the parsed root for follow-up structural asserts.
+ */
+function assertParseable(raw: string): JsoncValue {
+  const result = parseJsonc(raw);
+  if (result.ast.root === null) {
+    throw new Error("expected parseable JSONC root");
+  }
+  return result.ast.root;
+}
+
+/**
+ * The complement: malformed input round-trips bytes verbatim AND
+ * emits an error diagnostic. JC-17 needs this — without the
+ * diagnostic check, the test would pass even if the parser silently
+ * dropped malformed content.
+ */
+function assertNotParseable(raw: string): void {
+  const result = parseJsonc(raw);
+  expect(result.ast.root).toBeNull();
+  expect(result.diagnostics.some((d) => d.severity === "error")).toBe(true);
+}
+
+describe("jsonc byte-fidelity", () => {
+  it("empty file", () => {
+    expect(rt("")).toBe("");
+  });
+
+  it("whitespace-only", () => {
+    expect(rt("   \n\n   \n")).toBe("   \n\n   \n");
+  });
+
+  it("empty object", () => {
+    expect(rt("{}")).toBe("{}");
+    const root = assertParseable("{}");
+    expect(root.kind).toBe("object");
+    if (root.kind === "object") {
+      expect(root.entries).toHaveLength(0);
+    }
+  });
+
+  it("empty array", () => {
+    expect(rt("[]")).toBe("[]");
+    const root = assertParseable("[]");
+    expect(root.kind).toBe("array");
+    if (root.kind === "array") {
+      expect(root.items).toHaveLength(0);
+    }
+  });
+
+  it("trivial scalar root", () => {
+    expect(rt("42")).toBe("42");
+    expect(rt('"x"')).toBe('"x"');
+    expect(rt("true")).toBe("true");
+    expect(rt("null")).toBe("null");
+    expect(assertParseable("42").kind).toBe("number");
+    expect(assertParseable('"x"').kind).toBe("string");
+    expect(assertParseable("true").kind).toBe("boolean");
+    expect(assertParseable("null").kind).toBe("null");
+  });
+
+  it("line comments preserved", () => {
+    const raw = '// a leading comment\n{ "x": 1 } // trailing\n';
+    expect(rt(raw)).toBe(raw);
+    expect(assertParseable(raw).kind).toBe("object");
+  });
+
+  it("block comments preserved", () => {
+    const raw = '/* header */\n{\n  /* inline */\n  "x": 1\n}\n';
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    expect(root.kind).toBe("object");
+  });
+
+  it("trailing commas preserved", () => {
+    const raw = '{\n  "x": 1,\n  "y": 2,\n}';
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    if (root.kind === "object") {
+      expect(root.entries).toHaveLength(2);
+    }
+  });
+
+  it("mixed CRLF + LF preserved", () => {
+    const raw = '{\r\n  "x": 1,\n  "y": 2\r\n}';
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    if (root.kind === "object") {
+      expect(root.entries.map((e) => e.key)).toEqual(["x", "y"]);
+    }
+  });
+
+  it("BOM preserved on raw, stripped for parse", () => {
+    const raw = '{ "x": 1 }';
+    expect(rt(raw)).toBe(raw);
+    expect(assertParseable(raw).kind).toBe("object");
+  });
+
+  it("deeply nested structures preserved", () => {
+    const raw = '{ "a": { "b": { "c": { "d": [1, [2, [3, [4]]]] } } } }';
+    expect(rt(raw)).toBe(raw);
+    expect(assertParseable(raw).kind).toBe("object");
+  });
+
+  it("string with escape sequences preserved (parsed value has decoded chars)", () => {
+    const raw = '{ "s": "a\\nb\\tc\\u0041\\\\d\\"e" }';
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    if (root.kind === "object") {
+      const s = root.entries[0]?.value;
+      if (s?.kind === "string") {
+        expect(s.value).toBe('a\nb\tcA\\d"e');
+      }
+    }
+  });
+
+  it("numbers in scientific / negative / decimal forms preserved", () => {
+    const raw = "[ 0, -0, 1.5, -3.14, 1e3, -2.5e-10, 1E+5 ]";
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    if (root.kind === "array") {
+      expect(root.items).toHaveLength(7);
+      expect(root.items.every((v) => v.kind === "number")).toBe(true);
+    }
+  });
+
+  it("unicode characters preserved verbatim", () => {
+    const raw = '{ "name": "héllo 世界 🎉" }';
+    expect(rt(raw)).toBe(raw);
+    const root = assertParseable(raw);
+    if (root.kind === "object") {
+      const v = root.entries[0]?.value;
+      if (v?.kind === "string") {
+        expect(v.value).toBe("héllo 世界 🎉");
+      }
+    }
+  });
+
+  it("idiosyncratic whitespace preserved", () => {
+    const raw = '{    "x"   :     1    ,\n   "y":   2}';
+    expect(rt(raw)).toBe(raw);
+    expect(assertParseable(raw).kind).toBe("object");
+  });
+
+  it("file-level trailing whitespace preserved", () => {
+    const raw = '{ "x": 1 }\n\n\n';
+    expect(rt(raw)).toBe(raw);
+    expect(assertParseable(raw).kind).toBe("object");
+  });
+
+  it("malformed input still emits raw verbatim AND emits a diagnostic", () => {
+    const raw = '{ broken json with "key": value }';
+    expect(rt(raw)).toBe(raw);
+    assertNotParseable(raw);
+  });
+
+  it("comments-only file preserved", () => {
+    const raw = "// just a comment\n/* and a block */\n";
+    expect(rt(raw)).toBe(raw);
+    expect(parseJsonc(raw).ast.root).toBeNull();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/jsonc-resolver-edges.test.ts

@@ -0,0 +1,128 @@
+// OC Path tests cover jsonc resolver edges plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { resolveJsoncOcPath } from "../../jsonc/resolve.js";
+import { parseOcPath } from "../../oc-path.js";
+
+function rs(raw: string, ocPath: string) {
+  return resolveJsoncOcPath(parseJsonc(raw).ast, parseOcPath(ocPath));
+}
+
+describe("jsonc resolver edges", () => {
+  it("root resolves on empty object", () => {
+    expect(rs("{}", "oc://config")?.kind).toBe("root");
+  });
+
+  it("root resolves on scalar root", () => {
+    expect(rs("42", "oc://config")?.kind).toBe("root");
+  });
+
+  it("root resolves on array root", () => {
+    expect(rs("[1,2,3]", "oc://config")?.kind).toBe("root");
+  });
+
+  it("deep dotted descent within section", () => {
+    const m = rs('{"a":{"b":{"c":1}}}', "oc://config/a.b.c");
+    expect(m?.kind).toBe("object-entry");
+  });
+
+  it("missing intermediate key returns null", () => {
+    expect(rs('{"a":{"b":1}}', "oc://config/a.x.b")).toBeNull();
+  });
+
+  it("numeric segment indexes into array", () => {
+    const m = rs('{"items":["a","b","c"]}', "oc://config/items.1");
+    expect(m?.kind).toBe("value");
+    if (m?.kind === "value") {
+      expect(m.node.kind).toBe("string");
+      if (m.node.kind === "string") {
+        expect(m.node.value).toBe("b");
+      }
+    }
+  });
+
+  it("out-of-bounds array index returns null", () => {
+    expect(rs('{"x":[1,2]}', "oc://config/x.99")).toBeNull();
+  });
+
+  it("non-integer index returns null (no NaN coercion)", () => {
+    expect(rs('{"x":[1,2]}', "oc://config/x.foo")).toBeNull();
+  });
+
+  it("null AST root returns null on any path", () => {
+    expect(rs("", "oc://config/x")).toBeNull();
+  });
+
+  it("descending past a primitive returns null", () => {
+    expect(rs('{"x":42}', "oc://config/x.y")).toBeNull();
+  });
+
+  it("empty segment in dotted path throws OcPathError", () => {
+    // v1 invariant: malformed paths fail loud at parse time, not silently null.
+    expect(() => rs('{"x":1}', "oc://config/x..y")).toThrow(/Empty dotted sub-segment/);
+  });
+
+  it("string value at leaf surfaces via object-entry shape", () => {
+    const m = rs('{"k":"v"}', "oc://config/k");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.key).toBe("k");
+    }
+  });
+
+  it("boolean and null values resolve", () => {
+    const m1 = rs('{"k":true}', "oc://config/k");
+    expect(m1?.kind).toBe("object-entry");
+    const m2 = rs('{"k":null}', "oc://config/k");
+    expect(m2?.kind).toBe("object-entry");
+  });
+
+  it("mixed slash + dot segments resolve identically", () => {
+    const a = rs('{"a":{"b":{"c":1}}}', "oc://config/a.b.c");
+    const b = rs('{"a":{"b":{"c":1}}}', "oc://config/a/b.c");
+    const c = rs('{"a":{"b":{"c":1}}}', "oc://config/a/b/c");
+    expect(a?.kind).toBe(b?.kind);
+    expect(b?.kind).toBe(c?.kind);
+  });
+
+  it("keys with special characters resolve", () => {
+    const m = rs('{"a-b_c":{"x":1}}', "oc://config/a-b_c.x");
+    expect(m?.kind).toBe("object-entry");
+  });
+
+  it("unicode keys resolve", () => {
+    const m = rs('{"héllo":1}', "oc://config/héllo");
+    expect(m?.kind).toBe("object-entry");
+  });
+
+  it("large nested structure (depth 20) resolves to leaf", () => {
+    let json = '"leaf"';
+    const segs: string[] = [];
+    for (let i = 19; i >= 0; i--) {
+      json = `{"k${i}":${json}}`;
+      segs.unshift(`k${i}`);
+    }
+    const m = rs(json, `oc://config/${segs.join(".")}`);
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expect(m.node.value.kind).toBe("string");
+      if (m.node.value.kind === "string") {
+        expect(m.node.value.value).toBe("leaf");
+      }
+    }
+  });
+
+  it("resolver is non-mutating across calls", () => {
+    const { ast } = parseJsonc('{"x":{"y":1}}');
+    const before = JSON.stringify(ast);
+    rs('{"x":{"y":1}}', "oc://config/x.y");
+    rs('{"x":{"y":1}}', "oc://config/x");
+    rs('{"x":{"y":1}}', "oc://config/missing");
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+
+  it("hostile input shapes do not throw", () => {
+    expect(() => rs("{garbage}", "oc://config/x")).not.toThrow();
+    expect(() => rs('{"a":', "oc://config/a")).not.toThrow();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/jsonl-byte-fidelity.test.ts

@@ -0,0 +1,113 @@
+// OC Path tests cover jsonl byte fidelity plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+
+function rt(raw: string): string {
+  return emitJsonl(parseJsonl(raw).ast);
+}
+
+describe("jsonl byte-fidelity", () => {
+  it("empty file", () => {
+    expect(rt("")).toBe("");
+  });
+
+  it("single line no trailing newline", () => {
+    expect(rt('{"a":1}')).toBe('{"a":1}');
+  });
+
+  it("single line with trailing newline", () => {
+    expect(rt('{"a":1}\n')).toBe('{"a":1}\n');
+  });
+
+  it("multiple lines preserved", () => {
+    const raw = '{"a":1}\n{"b":2}\n{"c":3}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("blank line in the middle preserved", () => {
+    const raw = '{"a":1}\n\n{"b":2}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("multiple blank lines preserved", () => {
+    const raw = '{"a":1}\n\n\n{"b":2}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("malformed line round-trips verbatim", () => {
+    const raw = '{"a":1}\nthis is not json\n{"b":2}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("entirely malformed file round-trips", () => {
+    const raw = "header\nbody\nfooter\n";
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("leading + trailing blanks preserved", () => {
+    const raw = '\n\n{"a":1}\n\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("file ending without final newline preserved", () => {
+    const raw = '{"a":1}\n{"b":2}';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("nested object lines preserved", () => {
+    const raw = '{"a":{"b":{"c":1}}}\n{"x":[1,[2,[3]]]}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("unicode in a value line preserved", () => {
+    const raw = '{"name":"héllo 世界 🎉"}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("idiosyncratic whitespace inside a line preserved", () => {
+    const raw = '{   "a"  :   1   }\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("single blank line file preserved", () => {
+    const raw = "\n";
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("large log (1000 lines) preserved", () => {
+    const lines = Array.from({ length: 1000 }, (_, i) => `{"i":${i}}`);
+    const raw = lines.join("\n") + "\n";
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("mixed value + malformed + blank preserved", () => {
+    const raw = '{"a":1}\n{not json}\n\n{"b":2}\nstill not json\n{"c":3}\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  // F10 — CRLF preservation. Without lineEnding tracking on the AST,
+  // a CRLF input edited via setJsonlOcPath rebuilds raw via render
+  // which joins with `\n`, mixing endings on Windows-authored datasets.
+  it("CRLF input round-trips byte-identical via the default emit", () => {
+    const raw = '{"a":1}\r\n{"b":2}\r\n{"c":3}\r\n';
+    expect(rt(raw)).toBe(raw);
+  });
+
+  it("CRLF input preserves CRLF after a structural edit (render mode)", () => {
+    const raw = '{"a":1}\r\n{"b":2}\r\n';
+    const { ast } = parseJsonl(raw);
+    const rendered = emitJsonl(ast, { mode: "render" });
+    expect(rendered).toBe('{"a":1}\r\n{"b":2}');
+    expect((rendered.match(/\r\n/g) ?? []).length).toBe(1);
+    expect((rendered.match(/(?<!\r)\n/g) ?? []).length).toBe(0);
+  });
+
+  it("LF input preserves LF after a structural edit (render mode)", () => {
+    // Symmetric: a Unix-authored log doesn't mysteriously gain CRLF.
+    const raw = '{"a":1}\n{"b":2}\n';
+    const { ast } = parseJsonl(raw);
+    const rendered = emitJsonl(ast, { mode: "render" });
+    expect(rendered).toBe('{"a":1}\n{"b":2}');
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/jsonl-resolver-edges.test.ts

@@ -0,0 +1,134 @@
+// OC Path tests cover jsonl resolver edges plugin behavior.
+import { describe, expect, it } from "vitest";
+import type { JsoncValue } from "../../jsonc/ast.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { resolveJsonlOcPath } from "../../jsonl/resolve.js";
+import { parseOcPath } from "../../oc-path.js";
+
+function rs(raw: string, ocPath: string) {
+  return resolveJsonlOcPath(parseJsonl(raw).ast, parseOcPath(ocPath));
+}
+
+function expectNumberValue(node: JsoncValue, value: number) {
+  expect(node.kind).toBe("number");
+  if (node.kind === "number") {
+    expect(node.value).toBe(value);
+  }
+}
+
+function expectStringValue(node: JsoncValue, value: string) {
+  expect(node.kind).toBe("string");
+  if (node.kind === "string") {
+    expect(node.value).toBe(value);
+  }
+}
+
+describe("jsonl resolver edges", () => {
+  it("root resolves with no segments", () => {
+    expect(rs('{"a":1}\n', "oc://log")?.kind).toBe("root");
+  });
+
+  it("L1 resolves to a value line", () => {
+    const m = rs('{"a":1}\n', "oc://log/L1");
+    expect(m?.kind).toBe("line");
+  });
+
+  it("L99 unknown line returns null", () => {
+    expect(rs('{"a":1}\n', "oc://log/L99")).toBeNull();
+  });
+
+  it("$last picks the most recent value line", () => {
+    const m = rs('{"a":1}\n{"a":2}\n{"a":3}\n', "oc://log/$last/a");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expectNumberValue(m.node.value, 3);
+    }
+  });
+
+  it("$last skips trailing blank lines", () => {
+    const m = rs('{"a":1}\n\n\n', "oc://log/$last/a");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expectNumberValue(m.node.value, 1);
+    }
+  });
+
+  it("$last skips trailing malformed lines", () => {
+    const m = rs('{"a":1}\nbroken\n', "oc://log/$last/a");
+    expect(m?.kind).toBe("object-entry");
+  });
+
+  it("$last on empty file returns null", () => {
+    expect(rs("", "oc://log/$last/x")).toBeNull();
+  });
+
+  it("$last on all-blank file returns null", () => {
+    expect(rs("\n\n\n", "oc://log/$last/x")).toBeNull();
+  });
+
+  it("$last on all-malformed file returns null", () => {
+    expect(rs("a\nb\nc\n", "oc://log/$last/x")).toBeNull();
+  });
+
+  it("garbage line address returns null", () => {
+    expect(rs('{"a":1}\n', "oc://log/garbage")).toBeNull();
+    expect(rs('{"a":1}\n', "oc://log/L")).toBeNull();
+    expect(rs('{"a":1}\n', "oc://log/Labc")).toBeNull();
+  });
+
+  it("descent into a blank line returns null", () => {
+    expect(rs('{"a":1}\n\n{"b":2}\n', "oc://log/L2/anything")).toBeNull();
+  });
+
+  it("descent into a malformed line returns null", () => {
+    expect(rs('{"a":1}\nbroken\n{"b":2}\n', "oc://log/L2/anything")).toBeNull();
+  });
+
+  it("missing field on a value line returns null", () => {
+    expect(rs('{"a":1}\n', "oc://log/L1/missing")).toBeNull();
+  });
+
+  it("dotted descent through line value resolves", () => {
+    const m = rs('{"r":{"ok":true,"d":"x"}}\n', "oc://log/L1/r.d");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expectStringValue(m.node.value, "x");
+    }
+  });
+
+  it("array index inside a line resolves", () => {
+    const m = rs('{"items":["a","b","c"]}\n', "oc://log/L1/items.2");
+    expect(m?.kind).toBe("value");
+    if (m?.kind === "value") {
+      expectStringValue(m.node, "c");
+    }
+  });
+
+  it("line numbers are 1-indexed", () => {
+    const m = rs('{"a":1}\n{"a":2}\n', "oc://log/L1/a");
+    if (m?.kind === "object-entry") {
+      expectNumberValue(m.node.value, 1);
+    }
+  });
+
+  it("line numbers preserved across blank/malformed entries", () => {
+    const m = rs('{"a":1}\n\nbroken\n{"a":4}\n', "oc://log/L4/a");
+    expect(m?.kind).toBe("object-entry");
+    if (m?.kind === "object-entry") {
+      expectNumberValue(m.node.value, 4);
+    }
+  });
+
+  it("resolver is non-mutating", () => {
+    const { ast } = parseJsonl('{"a":1}\n{"b":2}\n');
+    const before = JSON.stringify(ast);
+    rs('{"a":1}\n{"b":2}\n', "oc://log/L1");
+    rs('{"a":1}\n{"b":2}\n', "oc://log/$last");
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+
+  it("hostile inputs do not throw", () => {
+    expect(() => rs("not json\n", "oc://log/L1")).not.toThrow();
+    expect(() => rs("", "oc://log/$last")).not.toThrow();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/malformed-input.test.ts

@@ -0,0 +1,149 @@
+// OC Path tests cover malformed input plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../../parse.js";
+
+describe("malformed-input", () => {
+  it("truncated mid-frontmatter (no close fence)", () => {
+    const raw = "---\nname: github\n";
+    const { ast, diagnostics } = parseMd(raw);
+    expect(diagnostics.some((d) => d.code === "OC_FRONTMATTER_UNCLOSED")).toBe(true);
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("truncated mid-section", () => {
+    const raw = "## H\n- item\nmid-line";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.length).toBe(1);
+  });
+
+  it("only `---` (single fence, no content)", () => {
+    expect(() => parseMd("---\n")).not.toThrow();
+  });
+
+  it("only `---\\n---`", () => {
+    const { ast } = parseMd("---\n---");
+    expect(ast.frontmatter).toEqual([]);
+  });
+
+  it("binary-ish bytes (non-ASCII control chars)", () => {
+    const raw = "## H\n\x00\x01\x02\n";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("very long single line (10k chars)", () => {
+    const raw = `## H\n${"x".repeat(10_000)}\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.heading).toBe("H");
+  });
+
+  it("deeply repeated headings (1000 H2 blocks)", () => {
+    const lines: string[] = [];
+    for (let i = 0; i < 1000; i++) {
+      lines.push(`## H${i}`);
+      lines.push(`- item ${i}`);
+    }
+    const raw = lines.join("\n") + "\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.length).toBe(1000);
+  });
+
+  it("bullet shape that isn't actually a bullet (`-not-a-bullet`)", () => {
+    const { ast } = parseMd("## H\n-not-a-bullet\n- real\n");
+    expect(ast.blocks[0]?.items.length).toBe(1);
+  });
+
+  it("unclosed code fence", () => {
+    const raw = "## H\n```\nbody\n";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("mismatched fence (open with ``` close with ~~~)", () => {
+    const raw = "## H\n```\nbody\n~~~\n";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("nested fences (treated linearly, not nested)", () => {
+    const raw = "## H\n```\n```\nstill-in-second\n```\n";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("empty file", () => {
+    const { ast, diagnostics } = parseMd("");
+    expect(ast.raw).toBe("");
+    expect(ast.frontmatter).toEqual([]);
+    expect(ast.blocks).toEqual([]);
+    expect(diagnostics).toEqual([]);
+  });
+
+  it("single character file", () => {
+    const { ast } = parseMd("x");
+    expect(ast.preamble).toBe("x");
+    expect(ast.blocks).toEqual([]);
+  });
+
+  it("single newline file", () => {
+    const { ast } = parseMd("\n");
+    expect(ast.blocks).toEqual([]);
+  });
+
+  it("file with mixed indentation extremes (tabs, spaces, mixed)", () => {
+    const raw = "## H\n\t- tabbed\n  - spaced\n\t  - mixed\n";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("frontmatter with frontmatter-shaped content inside (---)", () => {
+    const raw = "---\nk: v\n---\n\n---\nshould not parse as second frontmatter\n---\n";
+    const { ast } = parseMd(raw);
+    expect(ast.frontmatter.map((e) => e.key)).toEqual(["k"]);
+    // Second `---` block becomes part of preamble/body (it's not at file start).
+    expect(ast.preamble).toContain("---");
+  });
+
+  it("lines starting with `#` but not heading (raw `#` chars in body)", () => {
+    const raw = "## H\n\n# This is text starting with #\n#### h4 not parsed as block\n";
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.bodyText).toContain("# This is text");
+  });
+
+  it("lines starting with multiple ## but malformed (####, ######)", () => {
+    const { ast } = parseMd("## Real\n#### Not block\n###### Not block\n");
+    expect(ast.blocks.length).toBe(1);
+    expect(ast.blocks[0]?.heading).toBe("Real");
+  });
+
+  it("file with just whitespace", () => {
+    expect(() => parseMd("     \n\t\n   \n")).not.toThrow();
+  });
+
+  it("file with only BOM", () => {
+    const { ast } = parseMd("");
+    expect(ast.raw).toBe("");
+  });
+
+  it("file mixing BOM + frontmatter + body + sections", () => {
+    const raw = "---\nk: v\n---\n\nbody\n## Section\n- item\n";
+    expect(() => parseMd(raw)).not.toThrow();
+    const { ast } = parseMd(raw);
+    expect(ast.frontmatter[0]?.value).toBe("v");
+    expect(ast.blocks[0]?.heading).toBe("Section");
+  });
+
+  it("line endings: legacy CR-only (Mac classic)", () => {
+    // Our regex /\r?\n/ doesn't split on CR-only. Treats whole as one line.
+    const raw = "line1\rline2\r## Heading\r";
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+
+  it("100 KB file", () => {
+    const lines: string[] = [];
+    for (let i = 0; i < 1000; i++) {
+      lines.push("## H" + i);
+      for (let j = 0; j < 5; j++) {
+        lines.push(`- item-${i}-${j}: value with some text content here`);
+      }
+    }
+    const raw = lines.join("\n");
+    expect(() => parseMd(raw)).not.toThrow();
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/oc-path-parse-edges.test.ts

@@ -0,0 +1,213 @@
+// OC Path tests cover oc path parse edges plugin behavior.
+import { describe, expect, it } from "vitest";
+import {
+  OcPathError,
+  formatOcPath,
+  getPathLayout,
+  isPattern,
+  isValidOcPath,
+  parseOcPath,
+} from "../../oc-path.js";
+
+function expectErr(fn: () => unknown, code: string): void {
+  try {
+    fn();
+    expect.fail(`expected OcPathError code ${code}`);
+  } catch (err) {
+    expect(err).toBeInstanceOf(OcPathError);
+    expect((err as OcPathError).code).toBe(code);
+  }
+}
+
+describe("oc-path-parse-edges", () => {
+  it("file-only", () => {
+    expect(parseOcPath("oc://SOUL.md")).toEqual({ file: "SOUL.md" });
+  });
+
+  it("file + section", () => {
+    expect(parseOcPath("oc://SOUL.md/Boundaries").section).toBe("Boundaries");
+  });
+
+  it("file + section + item", () => {
+    expect(parseOcPath("oc://SOUL.md/Boundaries/deny-rule-1").item).toBe("deny-rule-1");
+  });
+
+  it("file + section + item + field", () => {
+    expect(parseOcPath("oc://SOUL.md/B/deny-1/risk").field).toBe("risk");
+  });
+
+  it("session query parameter", () => {
+    expect(parseOcPath("oc://X.md?session=daily").session).toBe("daily");
+  });
+
+  it("session with full path", () => {
+    const p = parseOcPath("oc://X.md/sec/item/field?session=cron");
+    expect(p).toEqual({
+      file: "X.md",
+      section: "sec",
+      item: "item",
+      field: "field",
+      session: "cron",
+    });
+  });
+
+  it("unknown query parameters silently ignored", () => {
+    const p = parseOcPath("oc://X.md?foo=bar&session=s&baz=qux");
+    expect(p.session).toBe("s");
+  });
+
+  it("session= with empty value drops session", () => {
+    const p = parseOcPath("oc://X.md?session=");
+    expect(p.session).toBeUndefined();
+  });
+
+  it("query without `=` ignored", () => {
+    const p = parseOcPath("oc://X.md?nokeyhere");
+    expect(p.session).toBeUndefined();
+  });
+
+  it("missing scheme throws", () => {
+    expectErr(() => parseOcPath("SOUL.md"), "OC_PATH_MISSING_SCHEME");
+  });
+
+  it("wrong scheme throws", () => {
+    expectErr(() => parseOcPath("https://x.com"), "OC_PATH_MISSING_SCHEME");
+  });
+
+  it("empty after scheme throws", () => {
+    expectErr(() => parseOcPath("oc://"), "OC_PATH_EMPTY");
+  });
+
+  it("empty segment throws", () => {
+    expectErr(() => parseOcPath("oc://X.md//item"), "OC_PATH_EMPTY_SEGMENT");
+  });
+
+  it("too-deep nesting throws", () => {
+    expectErr(() => parseOcPath("oc://X.md/a/b/c/d/e"), "OC_PATH_TOO_DEEP");
+  });
+
+  it("non-string throws", () => {
+    expectErr(() => parseOcPath(42 as unknown as string), "OC_PATH_NOT_STRING");
+  });
+
+  it("round-trip canonical forms", () => {
+    const cases = [
+      "oc://SOUL.md",
+      "oc://SOUL.md/Boundaries",
+      "oc://SOUL.md/Boundaries/deny-rule-1",
+      "oc://SOUL.md/Boundaries/deny-rule-1/risk",
+      "oc://SOUL.md?session=daily",
+      "oc://X.md/a/b/c?session=s",
+      "oc://skills/email-drafter/[frontmatter]/name",
+      "oc://config/plugins.entries.foo.token",
+    ];
+    for (const c of cases) {
+      expect(formatOcPath(parseOcPath(c)), `round-trip failed for ${c}`).toBe(c);
+    }
+  });
+
+  it("isValidOcPath true positives", () => {
+    expect(isValidOcPath("oc://X.md")).toBe(true);
+    expect(isValidOcPath("oc://X.md/sec/item/field")).toBe(true);
+  });
+
+  it("isValidOcPath true negatives", () => {
+    expect(isValidOcPath("")).toBe(false);
+    expect(isValidOcPath("X.md")).toBe(false);
+    expect(isValidOcPath("oc://")).toBe(false);
+    expect(isValidOcPath("oc://x//y")).toBe(false);
+    expect(isValidOcPath(null)).toBe(false);
+    expect(isValidOcPath({})).toBe(false);
+  });
+
+  it("file segment with special chars (file with dots/slashes)", () => {
+    const p = parseOcPath("oc://config/plugins.entries.foo.token");
+    expect(p.file).toBe("config");
+    expect(p.section).toBe("plugins.entries.foo.token");
+  });
+
+  it("section segment with hyphens / underscores / numbers", () => {
+    const p = parseOcPath("oc://X.md/Multi-Tenant_Section_2");
+    expect(p.section).toBe("Multi-Tenant_Section_2");
+  });
+
+  it("[frontmatter] sentinel is just a section name", () => {
+    const p = parseOcPath("oc://X.md/[frontmatter]/name");
+    expect(p.section).toBe("[frontmatter]");
+    expect(p.item).toBe("name");
+  });
+
+  it("formatOcPath rejects empty file", () => {
+    expectErr(() => formatOcPath({ file: "" }), "OC_PATH_FILE_REQUIRED");
+  });
+
+  it("formatOcPath rejects item without section", () => {
+    expectErr(() => formatOcPath({ file: "X.md", item: "i" }), "OC_PATH_NESTING");
+  });
+
+  it("formatOcPath quotes raw slot values containing special chars", () => {
+    const constructed = formatOcPath({
+      file: "config.jsonc",
+      section: "agents.defaults.models",
+      item: "github-copilot/claude-opus-4-7",
+      field: "alias",
+    });
+    expect(constructed).toBe(
+      'oc://config.jsonc/agents.defaults.models/"github-copilot/claude-opus-4-7"/alias',
+    );
+    const parsed = parseOcPath(constructed);
+    expect(parsed.item).toBe('"github-copilot/claude-opus-4-7"');
+  });
+
+  it("parseOcPath finds query separator outside quoted keys", () => {
+    const parsed = parseOcPath('oc://config.jsonc/"foo?bar"?session=daily');
+    expect(parsed.section).toBe('"foo?bar"');
+    expect(parsed.session).toBe("daily");
+  });
+
+  it("file slot with `/` round-trips via quoting", () => {
+    const constructed = formatOcPath({
+      file: "skills/email-drafter",
+      section: "Tools",
+      item: "-1",
+    });
+    expect(constructed).toBe('oc://"skills/email-drafter"/Tools/-1');
+    const parsed = parseOcPath(constructed);
+    expect(parsed.file).toBe("skills/email-drafter");
+    expect(parsed.section).toBe("Tools");
+    expect(parsed.item).toBe("-1");
+  });
+
+  it("file slot with dot extension does NOT get quoted", () => {
+    expect(formatOcPath({ file: "AGENTS.md" })).toBe("oc://AGENTS.md");
+    expect(formatOcPath({ file: "gateway.jsonc", section: "version" })).toBe(
+      "oc://gateway.jsonc/version",
+    );
+  });
+
+  it("formatOcPath rejects field without item or section", () => {
+    expect(() => formatOcPath({ file: "X", field: "name" })).toThrow(OcPathError);
+    try {
+      formatOcPath({ file: "X", field: "name" });
+    } catch (err) {
+      expect(err).toBeInstanceOf(OcPathError);
+      expect((err as OcPathError).code).toBe("OC_PATH_NESTING");
+    }
+  });
+
+  it("isPattern is quote-aware (literal `*` inside quoted segment)", () => {
+    const concrete = parseOcPath('oc://config.jsonc/"items.*.glob"');
+    expect(isPattern(concrete)).toBe(false);
+    const wildcard = parseOcPath("oc://config.jsonc/items/*");
+    expect(isPattern(wildcard)).toBe(true);
+  });
+
+  it("getPathLayout is quote-aware", () => {
+    const path = parseOcPath('oc://config.jsonc/"github.com"/repos');
+    const layout = getPathLayout(path);
+    expect(layout.sectionLen).toBe(1);
+    expect(layout.subs[0]).toBe('"github.com"');
+    expect(layout.itemLen).toBe(1);
+    expect(layout.subs[1]).toBe("repos");
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/oc-path-resolver-edges.test.ts

@@ -0,0 +1,240 @@
+// OC Path tests cover oc path resolver edges plugin behavior.
+import { describe, expect, it } from "vitest";
+import { parseMd } from "../../parse.js";
+import { resolveMdOcPath as resolveOcPath } from "../../resolve.js";
+
+const SAMPLE = `---
+name: github
+description: gh CLI
+url: https://example.com
+---
+
+Preamble prose.
+
+## Boundaries
+
+- never write to /etc
+- always confirm before deleting
+
+## Tools
+
+- gh: GitHub CLI
+- curl: HTTP client
+- The Tool: with caps and spaces
+
+## Multi-Word Section
+
+- item one
+`;
+
+describe("oc-path-resolver-edges", () => {
+  const { ast } = parseMd(SAMPLE);
+
+  it("root resolves to AST", () => {
+    const m = resolveOcPath(ast, { file: "X.md" });
+    expect(m?.kind).toBe("root");
+  });
+
+  it("block by exact slug", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "boundaries" });
+    expect(m?.kind).toBe("block");
+  });
+
+  it("block by case-mismatched slug (Boundaries → boundaries)", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "Boundaries" });
+    expect(m?.kind).toBe("block");
+  });
+
+  it("block by uppercased slug", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "BOUNDARIES" });
+    expect(m?.kind).toBe("block");
+  });
+
+  it("multi-word section by slug", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "multi-word-section" });
+    expect(m?.kind).toBe("block");
+    if (m?.kind === "block") {
+      expect(m.node.heading).toBe("Multi-Word Section");
+    }
+  });
+
+  it("multi-word section by exact heading text (case-folded)", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "Multi-Word Section" });
+    // The OcPath section is matched case-insensitively against block.slug.
+    // Block.slug for "Multi-Word Section" is "multi-word-section", and
+    // path.section.toLowerCase() = "multi-word section" which does NOT
+    // match "multi-word-section". Documented limit — callers must
+    // pass slug form, not heading text. This is intentional.
+    expect(m).toBeNull();
+  });
+
+  it("unknown section returns null", () => {
+    const m = resolveOcPath(ast, { file: "X.md", section: "unknown" });
+    expect(m).toBeNull();
+  });
+
+  it("item by slug under known section", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "gh",
+    });
+    expect(m?.kind).toBe("item");
+  });
+
+  it('R-09 item slug for KV uses kv.key (gh, not "gh-github-cli")', () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "gh",
+    });
+    if (m === null) {
+      throw new Error("expected tools item match");
+    }
+    if (m.kind === "item") {
+      expect(m.node.kv?.value).toBe("GitHub CLI");
+    }
+  });
+
+  it("item slug for plain bullet uses text", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "boundaries",
+      item: "never-write-to-etc",
+    });
+    expect(m?.kind).toBe("item");
+  });
+
+  it("item slug case-insensitive", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "GH",
+    });
+    expect(m?.kind).toBe("item");
+  });
+
+  it("item with spaces in key (slugified)", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "the-tool",
+    });
+    expect(m?.kind).toBe("item");
+    if (m?.kind === "item") {
+      expect(m.node.kv?.value).toBe("with caps and spaces");
+    }
+  });
+
+  it("unknown item returns null", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "nonexistent",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("item-field matches kv.key (case-insensitive)", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "gh",
+      field: "gh",
+    });
+    expect(m?.kind).toBe("item-field");
+  });
+
+  it("field on plain (non-kv) item returns null", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "boundaries",
+      item: "never-write-to-etc",
+      field: "risk",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("field that does not match kv.key returns null", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "tools",
+      item: "gh",
+      field: "nonexistent",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("frontmatter via [frontmatter] sentinel section", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "[frontmatter]",
+      field: "name",
+    });
+    expect(m?.kind).toBe("frontmatter");
+    if (m?.kind === "frontmatter") {
+      expect(m.node.value).toBe("github");
+    }
+  });
+
+  it("frontmatter unknown key returns null", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "[frontmatter]",
+      field: "nonexistent",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("frontmatter without field returns null", () => {
+    const m = resolveOcPath(ast, {
+      file: "X.md",
+      section: "[frontmatter]",
+    });
+    expect(m).toBeNull();
+  });
+
+  it("multiple frontmatter keys with same name — first match wins", () => {
+    // Build an AST manually to test
+    const dupeAst = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [
+        { key: "k", value: "first", line: 2 },
+        { key: "k", value: "second", line: 3 },
+      ],
+      preamble: "",
+      blocks: [],
+    };
+    const m = resolveOcPath(dupeAst, {
+      file: "X.md",
+      section: "[frontmatter]",
+      field: "k",
+    });
+    expect(m?.kind).toBe("frontmatter");
+    if (m?.kind === "frontmatter") {
+      expect(m.node.value).toBe("first");
+    }
+  });
+
+  it("empty AST resolves root only", () => {
+    const empty = { kind: "md" as const, raw: "", frontmatter: [], preamble: "", blocks: [] };
+    expect(resolveOcPath(empty, { file: "X.md" })?.kind).toBe("root");
+    expect(resolveOcPath(empty, { file: "X.md", section: "any" })).toBeNull();
+  });
+
+  it("resolver does not mutate the AST", () => {
+    const before = JSON.stringify(ast);
+    resolveOcPath(ast, { file: "X.md", section: "tools", item: "gh", field: "gh" });
+    const after = JSON.stringify(ast);
+    expect(after).toBe(before);
+  });
+
+  it("file segment is informational — resolver doesn't check it", () => {
+    // The file name in OcPath is metadata; resolver assumes the AST
+    // matches. Callers verify file mapping before passing the AST.
+    const m1 = resolveOcPath(ast, { file: "SOUL.md", section: "tools" });
+    const m2 = resolveOcPath(ast, { file: "AGENTS.md", section: "tools" });
+    expect(m1?.kind).toBe(m2?.kind);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/perf-determinism.test.ts

@@ -0,0 +1,125 @@
+// OC Path tests cover perf determinism plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { parseMd } from "../../parse.js";
+import { resolveMdOcPath as resolveOcPath } from "../../resolve.js";
+
+const perfBudgetMultiplier = process.env.CI ? 4 : 1;
+
+function expectWithinPerfBudget(elapsedMs: number, localBudgetMs: number) {
+  expect(elapsedMs).toBeLessThan(localBudgetMs * perfBudgetMultiplier);
+}
+
+describe("perf + determinism", () => {
+  it("parses 100 KB file within the parser budget", () => {
+    const lines: string[] = [];
+    for (let i = 0; i < 1000; i++) {
+      lines.push("## H" + i);
+      for (let j = 0; j < 5; j++) {
+        lines.push(`- key${i}-${j}: value with content`);
+      }
+    }
+    const raw = lines.join("\n");
+    const start = performance.now();
+    parseMd(raw);
+    const elapsed = performance.now() - start;
+    expectWithinPerfBudget(elapsed, 200);
+  });
+
+  it("parses 1000 small files in under 500 ms", () => {
+    const raw = `## H\n- a\n- b: c\n## I\n- d\n`;
+    const start = performance.now();
+    for (let i = 0; i < 1000; i++) {
+      parseMd(raw);
+    }
+    const elapsed = performance.now() - start;
+    expectWithinPerfBudget(elapsed, 500);
+  });
+
+  it("100k OcPath resolutions on parsed AST in under 500 ms", () => {
+    const raw = `## A\n- a1\n- a2\n## B\n- b1\n- b2\n## C\n- c1: cv\n`;
+    const { ast } = parseMd(raw);
+    const path = { file: "X.md", section: "b", item: "b1" };
+    const start = performance.now();
+    for (let i = 0; i < 100_000; i++) {
+      resolveOcPath(ast, path);
+    }
+    const elapsed = performance.now() - start;
+    expectWithinPerfBudget(elapsed, 500);
+  });
+
+  it("same input → byte-identical AST.raw across runs", () => {
+    const raw = `---\nb: 2\na: 1\n---\n## Z\n- z\n## A\n- a\n`;
+    const a1 = parseMd(raw).ast;
+    const a2 = parseMd(raw).ast;
+    expect(a1.raw).toBe(a2.raw);
+    expect(a1.frontmatter).toEqual(a2.frontmatter);
+    expect(a1.blocks).toEqual(a2.blocks);
+  });
+
+  it("resolveOcPath is non-mutating", () => {
+    const raw = `## A\n- a: x\n## B\n- b\n`;
+    const { ast } = parseMd(raw);
+    const before = JSON.stringify(ast);
+    resolveOcPath(ast, { file: "X.md", section: "a", item: "a", field: "a" });
+    resolveOcPath(ast, { file: "X.md", section: "b" });
+    resolveOcPath(ast, { file: "X.md", section: "unknown" });
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+
+  it("AST is JSON-serializable (no functions, no cycles)", () => {
+    const raw = `---\nk: v\n---\n## A\n- a\n\`\`\`ts\nx\n\`\`\`\n| h |\n| - |\n| 1 |\n`;
+    const { ast } = parseMd(raw);
+    const serialized = JSON.stringify(ast);
+    const parsed = JSON.parse(serialized);
+    expect(parsed.raw).toBe(ast.raw);
+    expect(parsed.blocks.length).toBe(ast.blocks.length);
+  });
+
+  it("emit is non-mutating", () => {
+    const raw = `## A\n- a\n`;
+    const { ast } = parseMd(raw);
+    const before = JSON.stringify(ast);
+    emitMd(ast);
+    emitMd(ast);
+    emitMd(ast);
+    expect(JSON.stringify(ast)).toBe(before);
+  });
+
+  it("frontmatter ordering is preserved (insertion order, not alphabetical)", () => {
+    const raw = `---\nz: 1\nm: 2\na: 3\n---\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.frontmatter.map((e) => e.key)).toEqual(["z", "m", "a"]);
+  });
+
+  it("block ordering is document order, not alphabetical", () => {
+    const raw = `## Z\n## A\n## M\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks.map((b) => b.heading)).toEqual(["Z", "A", "M"]);
+  });
+
+  it("item ordering within block is document order", () => {
+    const raw = `## H\n- z\n- a\n- m\n`;
+    const { ast } = parseMd(raw);
+    expect(ast.blocks[0]?.items.map((i) => i.text)).toEqual(["z", "a", "m"]);
+  });
+
+  it("large fixture round-trip stays under 100 ms", () => {
+    const lines: string[] = [];
+    for (let i = 0; i < 500; i++) {
+      lines.push(`## Section ${i}`);
+      lines.push("");
+      for (let j = 0; j < 10; j++) {
+        lines.push(`- item-${i}-${j}: with some prose value content here`);
+      }
+      lines.push("");
+    }
+    const raw = lines.join("\n");
+    const start = performance.now();
+    const { ast } = parseMd(raw);
+    const out = emitMd(ast);
+    const elapsed = performance.now() - start;
+    expect(out).toBe(raw);
+    expectWithinPerfBudget(elapsed, 100);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/real-world-fixtures.test.ts

@@ -0,0 +1,132 @@
+// OC Path tests cover real world fixtures plugin behavior.
+import { readFileSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { parseMd } from "../../parse.js";
+import { resolveMdOcPath as resolveOcPath } from "../../resolve.js";
+
+const HERE = dirname(fileURLToPath(import.meta.url));
+const FIXTURES = join(HERE, "..", "fixtures", "real");
+
+function load(name: string): string {
+  return readFileSync(join(FIXTURES, name), "utf-8");
+}
+
+describe("real-world-fixtures", () => {
+  it("SOUL.md parses + round-trips", () => {
+    const raw = load("SOUL.md");
+    const { ast, diagnostics } = parseMd(raw);
+    expect(diagnostics).toEqual([]);
+    expect(emitMd(ast)).toBe(raw);
+    // Has at least one H2 block.
+    expect(ast.blocks.length).toBeGreaterThan(0);
+  });
+
+  it("AGENTS.md parses + resolves Tools section", () => {
+    const raw = load("AGENTS.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const tools = resolveOcPath(ast, { file: "AGENTS.md", section: "tools" });
+    expect(tools?.kind).toBe("block");
+    if (tools?.kind === "block") {
+      expect(tools.node.items.some((i) => i.kv?.key === "gh")).toBe(true);
+    }
+  });
+
+  it("MEMORY.md frontmatter scope resolves via [frontmatter]", () => {
+    const raw = load("MEMORY.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const scope = resolveOcPath(ast, {
+      file: "MEMORY.md",
+      section: "[frontmatter]",
+      field: "scope",
+    });
+    expect(scope?.kind).toBe("frontmatter");
+    if (scope?.kind === "frontmatter") {
+      expect(scope.node.value).toBe("project");
+    }
+  });
+
+  it("TOOLS.md tool-guidance section resolves by slug", () => {
+    const raw = load("TOOLS.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const guidance = resolveOcPath(ast, {
+      file: "TOOLS.md",
+      section: "tool-guidance",
+    });
+    expect(guidance?.kind).toBe("block");
+  });
+
+  it("IDENTITY.md sections resolvable by slug", () => {
+    const raw = load("IDENTITY.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const trust = resolveOcPath(ast, {
+      file: "IDENTITY.md",
+      section: "trust-level",
+    });
+    expect(trust?.kind).toBe("block");
+  });
+
+  it("USER.md Preferences items extracted", () => {
+    const raw = load("USER.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const prefs = resolveOcPath(ast, {
+      file: "USER.md",
+      section: "preferences",
+    });
+    expect(prefs?.kind).toBe("block");
+    if (prefs?.kind === "block") {
+      expect(prefs.node.items.length).toBeGreaterThan(0);
+    }
+  });
+
+  it("HEARTBEAT.md schedules — H2 sections as triggers", () => {
+    const raw = load("HEARTBEAT.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    expect(ast.blocks.length).toBeGreaterThanOrEqual(3);
+    const slugs = ast.blocks.map((b) => b.slug);
+    expect(slugs).toContain("every-30m-wake");
+    expect(slugs).toContain("every-4h-wake");
+  });
+
+  it("SKILL.md frontmatter has name + description + tier", () => {
+    const raw = load("SKILL.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    const fmKeys = ast.frontmatter.map((e) => e.key);
+    expect(fmKeys).toContain("name");
+    expect(fmKeys).toContain("description");
+    expect(fmKeys).toContain("tier");
+  });
+
+  it("BOOTSTRAP.md round-trips", () => {
+    const raw = load("BOOTSTRAP.md");
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+  });
+
+  it("all 8 fixtures combined round-trip-clean (sanity)", () => {
+    const names = [
+      "SOUL.md",
+      "AGENTS.md",
+      "MEMORY.md",
+      "TOOLS.md",
+      "IDENTITY.md",
+      "USER.md",
+      "HEARTBEAT.md",
+      "SKILL.md",
+      "BOOTSTRAP.md",
+    ];
+    for (const name of names) {
+      const raw = load(name);
+      expect(emitMd(parseMd(raw).ast), `${name} failed round-trip`).toBe(raw);
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/roundtrip-property.test.ts

@@ -0,0 +1,147 @@
+// OC Path tests cover roundtrip property plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { parseMd } from "../../parse.js";
+
+function roundTrip(raw: string): string {
+  return emitMd(parseMd(raw).ast);
+}
+
+describe("roundtrip-property", () => {
+  it("byte-fidelity over 100 generated shapes", () => {
+    const inputs = generateCorpus(100);
+    for (const raw of inputs) {
+      try {
+        expect(roundTrip(raw)).toBe(raw);
+      } catch (e) {
+        // Surface which input failed for debugging.
+        throw new Error(
+          `round-trip failed for input (length ${raw.length}):\n${JSON.stringify(raw.slice(0, 200))}\nError: ${(e as Error).message}`,
+          { cause: e },
+        );
+      }
+    }
+  });
+
+  it("parser idempotence (parse → emit → parse → identical AST shape)", () => {
+    const inputs = generateCorpus(50);
+    for (const raw of inputs) {
+      const a = parseMd(raw).ast;
+      const a2 = parseMd(emitMd(a)).ast;
+      // Compare structural fields; raw will of course be identical.
+      expect(a2.frontmatter).toEqual(a.frontmatter);
+      expect(a2.preamble).toEqual(a.preamble);
+      expect(a2.blocks.map(stripDerived)).toEqual(a.blocks.map(stripDerived));
+    }
+  });
+
+  it("stable output for identical input", () => {
+    const raw = `---\nname: x\n---\n\n## A\n- a\n## B\n- b: c\n`;
+    const out1 = roundTrip(raw);
+    const out2 = roundTrip(raw);
+    const out3 = roundTrip(raw);
+    expect(out1).toBe(out2);
+    expect(out2).toBe(out3);
+  });
+
+  it("ordering deterministic (no Object.keys / Set ordering surprises)", () => {
+    const raw = `---\nb: 2\na: 1\nc: 3\n---\n## Z\n- z\n## A\n- a\n`;
+    const a1 = parseMd(raw).ast;
+    const a2 = parseMd(raw).ast;
+    expect(a1.frontmatter.map((e) => e.key)).toEqual(a2.frontmatter.map((e) => e.key));
+    expect(a1.blocks.map((b) => b.heading)).toEqual(a2.blocks.map((b) => b.heading));
+  });
+
+  it("round-trip preserves comment-like lines (no comment recognition at substrate)", () => {
+    const raw = `## H\n\n<!-- a comment -->\n- bullet\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("round-trip preserves indented blocks (substrate doesn't reflow)", () => {
+    const raw = `## H\n\n    indented code-ish block\n      more indented\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("round-trip preserves blockquotes", () => {
+    const raw = `## H\n\n> quoted line 1\n> quoted line 2\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("round-trip preserves images / links", () => {
+    const raw = `## H\n\n![alt](path/to/img.png)\n[link](http://example.com)\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("round-trip preserves HTML", () => {
+    const raw = `## H\n\n<details><summary>x</summary>body</details>\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+
+  it("round-trip preserves consecutive headings with no body between", () => {
+    const raw = `## A\n## B\n## C\n`;
+    expect(roundTrip(raw)).toBe(raw);
+  });
+});
+
+function generateCorpus(count: number): string[] {
+  const corpus: string[] = [];
+  // Deterministic seed so flaky failures don't surface differently each run.
+  let seed = 42;
+  const rand = () => {
+    seed = (seed * 1664525 + 1013904223) % 2 ** 32;
+    return seed / 2 ** 32;
+  };
+  const choose = <T>(arr: readonly T[]): T => arr[Math.floor(rand() * arr.length)];
+
+  const headings = ["Boundaries", "Tools", "Memory", "Identity", "User", "Heartbeat", "Skills"];
+  const fmKeys = ["name", "description", "tier", "enabled", "timeout", "url"];
+  const fmValues = ["github", "gh CLI", "T1", "true", "15000", "https://example.com"];
+  const itemTexts = ["never write to /etc", "always confirm", "gh: GitHub CLI", "curl: HTTP"];
+  const eols = ["\n", "\r\n"];
+
+  for (let i = 0; i < count; i++) {
+    const eol = choose(eols);
+    const parts: string[] = [];
+
+    if (rand() < 0.5) {
+      parts.push("---");
+      const fmCount = Math.floor(rand() * 4);
+      for (let k = 0; k < fmCount; k++) {
+        parts.push(`${choose(fmKeys)}: ${choose(fmValues)}`);
+      }
+      parts.push("---");
+      parts.push("");
+    }
+
+    if (rand() < 0.3) {
+      parts.push("Some preamble.");
+      parts.push("");
+    }
+
+    const blockCount = Math.floor(rand() * 3) + 1;
+    for (let b = 0; b < blockCount; b++) {
+      parts.push(`## ${choose(headings)}`);
+      parts.push("");
+      const itemCount = Math.floor(rand() * 4);
+      for (let itLocal = 0; itLocal < itemCount; itLocal++) {
+        parts.push(`- ${choose(itemTexts)}`);
+      }
+      if (rand() < 0.2) {
+        parts.push("```");
+        parts.push("code");
+        parts.push("```");
+      }
+      parts.push("");
+    }
+
+    corpus.push(parts.join(eol));
+  }
+  return corpus;
+}
+
+function stripDerived(b: { heading: string; slug: string; bodyText: string }): {
+  heading: string;
+  slug: string;
+} {
+  return { heading: b.heading, slug: b.slug };
+}

extensions/oc-path/src/oc-path/tests/scenarios/security-and-limits.test.ts

@@ -0,0 +1,232 @@
+// OC Path tests cover security and limits plugin behavior.
+import { describe, expect, it } from "vitest";
+import {
+  MAX_PATH_LENGTH,
+  MAX_TRAVERSAL_DEPTH,
+  OcPathError,
+  findOcPaths,
+  formatOcPath,
+  parseOcPath,
+  resolveOcPath,
+  setOcPath,
+} from "../../index.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+
+describe("encoding edges", () => {
+  it("strips leading UTF-8 BOM from path string", () => {
+    expect(parseOcPath("oc://X/Y").file).toBe("X");
+  });
+
+  it("normalizes path segments to NFC", () => {
+    const nfc = "café";
+    const nfd = "café"; // decomposed
+    expect(parseOcPath(`oc://X/${nfd}`)).toEqual(parseOcPath(`oc://X/${nfc}`));
+  });
+
+  it("rejects whitespace inside identifier-shaped segments", () => {
+    expect(() => parseOcPath("oc://X/foo /bar")).toThrow(OcPathError);
+    expect(() => parseOcPath("oc://X/foo\tbar")).toThrow(OcPathError);
+  });
+
+  it("rejects control characters and NUL bytes anywhere in the path", () => {
+    expect(() => parseOcPath("oc://X/\x00")).toThrow(/Control character/);
+    expect(() => parseOcPath("oc://X/foo\x01bar")).toThrow(/Control character/);
+    expect(() => parseOcPath("oc://X/foo\x7Fbar")).toThrow(/Control character/);
+    expect(() => parseOcPath("oc://X.md/items/[k=a\x00b]")).toThrow(OcPathError);
+  });
+});
+
+describe("file-slot containment", () => {
+  it("rejects absolute POSIX file slot", () => {
+    expect(() => parseOcPath("oc:///etc/passwd")).toThrow(/Empty segment/);
+    expect(() => parseOcPath('oc://"/etc/passwd"/section')).toThrow(/Absolute file slot/);
+  });
+
+  it("rejects Windows drive-letter file slot", () => {
+    expect(() => parseOcPath('oc://"C:/Windows/System32/foo"/section')).toThrow(
+      /Absolute file slot/,
+    );
+    // `\` inside quoted segments is rejected outright (no escape support).
+    expect(() => parseOcPath('oc://"C:\\\\Windows\\\\System32"/section')).toThrow(OcPathError);
+  });
+
+  it("rejects leading-backslash UNC path", () => {
+    expect(() => parseOcPath('oc://"\\\\srv\\\\share\\\\foo"/section')).toThrow(OcPathError);
+  });
+
+  it("rejects parent-directory escapes", () => {
+    expect(() => parseOcPath('oc://"../foo"/section')).toThrow(/Parent-directory/);
+    expect(() => parseOcPath('oc://"foo/../bar"/section')).toThrow(/Parent-directory/);
+  });
+
+  it("does not URL-decode `%2E%2E` — substrate isn't an HTTP layer", () => {
+    expect(parseOcPath('oc://"%2E%2E/foo"/section').file).toBe("%2E%2E/foo");
+  });
+
+  it("formatOcPath rejects absolute and parent-directory file slots", () => {
+    expect(() => formatOcPath({ file: "/etc/passwd" })).toThrow(/Absolute file slot/);
+    expect(() => formatOcPath({ file: "C:/Windows" })).toThrow(/Absolute file slot/);
+    expect(() => formatOcPath({ file: ".." })).toThrow(/Parent-directory/);
+    expect(() => formatOcPath({ file: "foo/../bar" })).toThrow(/Parent-directory/);
+  });
+});
+
+describe("path-string and traversal caps", () => {
+  it("parseOcPath rejects strings longer than MAX_PATH_LENGTH", () => {
+    expect(() => parseOcPath("oc://X/" + "a".repeat(MAX_PATH_LENGTH))).toThrow(/exceeds .* bytes/);
+  });
+
+  it("parseOcPath accepts a path right at the cap", () => {
+    const justUnder = "oc://X/" + "a".repeat(MAX_PATH_LENGTH - "oc://X/".length);
+    expect(() => parseOcPath(justUnder)).not.toThrow();
+  });
+
+  it("formatOcPath enforces the same cap on output", () => {
+    expect(() => formatOcPath({ file: "X", section: "a".repeat(MAX_PATH_LENGTH) })).toThrow(
+      /Formatted oc:\/\/ exceeds/,
+    );
+  });
+
+  it("walker depth cap fires on synthetic deeply-nested AST", () => {
+    // Bypasses parser depth cap so the walker defense fires in isolation.
+    type V = import("../../jsonc/ast.js").JsoncValue;
+    let leaf: V = { kind: "string", value: "x", line: 1 };
+    for (let i = 0; i < MAX_TRAVERSAL_DEPTH + 50; i++) {
+      leaf = { kind: "object", entries: [{ key: "a", value: leaf, line: 1 }], line: 1 };
+    }
+    const ast = {
+      kind: "jsonc" as const,
+      raw: "",
+      root: { kind: "object" as const, entries: [{ key: "root", value: leaf, line: 1 }], line: 1 },
+    };
+    expect(() => findOcPaths(ast, parseOcPath("oc://X/**"))).toThrow(/MAX_TRAVERSAL_DEPTH/);
+  });
+
+  it("jsonc parser surfaces a structured diagnostic on pathological nesting", () => {
+    const open = "[".repeat(MAX_TRAVERSAL_DEPTH + 100);
+    const close = "]".repeat(MAX_TRAVERSAL_DEPTH + 100);
+    const result = parseJsonc(`${open}0${close}`);
+    expect(result.ast.root).toBeNull();
+    expect(result.diagnostics.some((d) => d.code === "OC_JSONC_DEPTH_EXCEEDED")).toBe(true);
+  });
+
+  it("jsonl per-line parser flags malformed deeply-nested values", () => {
+    let nested = '"x"';
+    for (let i = 0; i < MAX_TRAVERSAL_DEPTH + 50; i++) {
+      nested = `{"a":${nested}}`;
+    }
+    const { diagnostics } = parseJsonl(nested + "\n");
+    expect(diagnostics.some((d) => d.code === "OC_JSONL_LINE_MALFORMED")).toBe(true);
+  });
+});
+
+describe("sentinel literal at format boundary", () => {
+  it("formatOcPath rejects a struct carrying the redaction sentinel", () => {
+    expect(() => formatOcPath({ file: "AGENTS.md", section: "__OPENCLAW_REDACTED__" })).toThrow(
+      /sentinel literal/,
+    );
+  });
+});
+
+describe("numeric segments dispatch by node kind", () => {
+  it("negative numeric key on object resolves as literal key (openclaw#59934)", () => {
+    // Telegram supergroup IDs are negative numbers used as map keys.
+    const ast = parseJsonc(
+      '{"channels":{"telegram":{"groups":{"-5028303500":{"requireMention":false}}}}}',
+    ).ast;
+    const m = resolveOcPath(
+      ast,
+      parseOcPath("oc://config/channels.telegram.groups.-5028303500.requireMention"),
+    );
+    expect(m?.kind).toBe("leaf");
+  });
+
+  it("`$last` literal key on an object is shadowed by the positional sentinel", () => {
+    const ast = parseJsonc('{"$last":"literal-value","foo":"bar"}').ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://X/$last"));
+    expect(m?.kind === "leaf" && m.valueText).toBe("bar");
+  });
+});
+
+describe("setOcPath value coercion is locale-independent and exact-match", () => {
+  it("number coercion accepts `1.5`, refuses `1,5`", () => {
+    const ast = parseJsonc('{"x":1.0}').ast;
+    expect(setOcPath(ast, parseOcPath("oc://X/x"), "1.5").ok).toBe(true);
+    const r = setOcPath(ast, parseOcPath("oc://X/x"), "1,5");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+
+  it("boolean coercion accepts `true` / `false` only", () => {
+    const ast = parseJsonc('{"x":true}').ast;
+    expect(setOcPath(ast, parseOcPath("oc://X/x"), "false").ok).toBe(true);
+    expect(setOcPath(ast, parseOcPath("oc://X/x"), "False").ok).toBe(false);
+    expect(setOcPath(ast, parseOcPath("oc://X/x"), "TRUE").ok).toBe(false);
+    expect(setOcPath(ast, parseOcPath("oc://X/x"), "yes").ok).toBe(false);
+  });
+});
+
+describe("predicate-value injection is contained", () => {
+  it("regex metacharacters in predicate value match literally, not as regex", () => {
+    const ast = parseJsonc('{"items":[{"name":"a.*"},{"name":"abc"}]}').ast;
+    const matches = findOcPaths(ast, parseOcPath("oc://X.jsonc/items/[name=a.*]"));
+    expect(matches).toHaveLength(1);
+  });
+
+  it("equals-sign in predicate value is treated as part of the value", () => {
+    const ast = parseJsonc('{"items":[{"k":"a=b"},{"k":"c"}]}').ast;
+    const matches = findOcPaths(ast, parseOcPath("oc://X.jsonc/items/[k=a=b]"));
+    expect(matches).toHaveLength(1);
+  });
+
+  it("predicate-shaped bracket without operator is a literal sentinel", () => {
+    expect(parseOcPath("oc://X.jsonc/items/[name]").item).toBe("[name]");
+  });
+
+  it("rejects empty predicate body and empty key/value", () => {
+    expect(() => parseOcPath("oc://X.jsonc/items/[]")).toThrow(OcPathError);
+    expect(() => parseOcPath("oc://X/[=foo]")).toThrow(/Malformed predicate/);
+    expect(() => parseOcPath("oc://X/[id=]")).toThrow(/Malformed predicate/);
+  });
+
+  it("predicate value containing `/` round-trips and matches literally", () => {
+    const p = parseOcPath("oc://X/[id=foo/bar]/cmd");
+    expect(p.section).toBe("[id=foo/bar]");
+    const ast = parseJsonc('{"steps":[{"id":"foo/bar","cmd":"x"},{"id":"baz","cmd":"y"}]}').ast;
+    const matches = findOcPaths(ast, parseOcPath("oc://wf/steps/[id=foo/bar]/cmd"));
+    expect(matches).toHaveLength(1);
+  });
+
+  it("predicate value containing `.` round-trips and matches literally", () => {
+    const ast = parseJsonc('{"steps":[{"id":"1.0","cmd":"x"},{"id":"2.0","cmd":"y"}]}').ast;
+    const matches = findOcPaths(ast, parseOcPath("oc://wf/steps/[id=1.0]/cmd"));
+    expect(matches).toHaveLength(1);
+  });
+});
+
+describe("structural rejection", () => {
+  it("rejects mismatched brackets and braces", () => {
+    expect(() => parseOcPath("oc://X/[unclosed")).toThrow(OcPathError);
+    expect(() => parseOcPath("oc://X/closed]")).toThrow(OcPathError);
+    expect(() => parseOcPath("oc://X/{a,b")).toThrow(OcPathError);
+  });
+
+  it("rejects empty union and empty alternative", () => {
+    expect(() => parseOcPath("oc://X/{}")).toThrow(/Empty union/);
+    expect(() => parseOcPath("oc://X/{a,,b}")).toThrow(/Empty alternative/);
+  });
+
+  it("rejects empty dotted sub-segment in formatOcPath output", () => {
+    expect(() => formatOcPath({ file: "a.md", section: "foo." })).toThrow(/Empty dotted/);
+    expect(() => formatOcPath({ file: "a.md", section: ".foo" })).toThrow(/Empty dotted/);
+    expect(() => formatOcPath({ file: "a.md", section: "foo..bar" })).toThrow(/Empty dotted/);
+  });
+
+  it("rejects unescaped `&` and `%` in segments", () => {
+    expect(() => parseOcPath("oc://X.md/a&b")).toThrow(OcPathError);
+    expect(() => parseOcPath("oc://X.md/a%b")).toThrow(OcPathError);
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/sentinel-cross-kind.test.ts

@@ -0,0 +1,149 @@
+// OC Path tests cover sentinel cross kind plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { setJsoncOcPath } from "../../jsonc/edit.js";
+import { emitJsonc } from "../../jsonc/emit.js";
+import { parseJsonc } from "../../jsonc/parse.js";
+import { emitJsonl } from "../../jsonl/emit.js";
+import { parseJsonl } from "../../jsonl/parse.js";
+import { parseOcPath } from "../../oc-path.js";
+import { parseMd } from "../../parse.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../../sentinel.js";
+
+describe("sentinel guard cross-kind", () => {
+  it("jsonc round-trip echoes safely when raw contains pre-existing sentinel", () => {
+    // Pre-existing sentinel bytes are trusted — see emit-policy comment
+    // in jsonc/emit.ts. The strict mode below is the opt-in path for
+    // callers who want LKG-style fingerprint verification.
+    const raw = `{ "x": "${REDACTED_SENTINEL}" }`;
+    const ast = parseJsonc(raw).ast;
+    expect(emitJsonc(ast)).toBe(raw);
+    // Strict mode still rejects pre-existing sentinel for callers who
+    // explicitly opt in.
+    expect(() => emitJsonc(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("jsonl round-trip echoes safely; strict mode rejects", () => {
+    const raw = `{"x":"${REDACTED_SENTINEL}"}\n`;
+    const ast = parseJsonl(raw).ast;
+    expect(emitJsonl(ast)).toBe(raw);
+    expect(() => emitJsonl(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("md round-trip echoes safely; strict mode rejects", () => {
+    const raw = `## Body\n\n- ${REDACTED_SENTINEL}\n`;
+    const ast = parseMd(raw).ast;
+    expect(emitMd(ast)).toBe(raw);
+    expect(() => emitMd(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("jsonc render mode walks every leaf for sentinel", () => {
+    const ast = parseJsonc('{ "x": "ok" }').ast;
+    const tampered = {
+      ...ast,
+      root: {
+        kind: "object" as const,
+        entries: [
+          {
+            key: "x",
+            line: 1,
+            value: { kind: "string" as const, value: REDACTED_SENTINEL },
+          },
+        ],
+      },
+    };
+    expect(() => emitJsonc(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("jsonl render mode walks every value-line leaf", () => {
+    const ast = parseJsonl('{"a":"ok"}\n').ast;
+    const tampered = {
+      ...ast,
+      lines: [
+        {
+          kind: "value" as const,
+          line: 1,
+          raw: '{"a":"ok"}',
+          value: {
+            kind: "object" as const,
+            entries: [
+              {
+                key: "a",
+                line: 1,
+                value: { kind: "string" as const, value: REDACTED_SENTINEL },
+              },
+            ],
+          },
+        },
+      ],
+    };
+    expect(() => emitJsonl(tampered, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("setJsoncOcPath itself throws when the new value contains the sentinel", () => {
+    // The substrate guard fires at write-time: setJsoncOcPath rebuilds
+    // raw via render mode emit, which scans every leaf. Defense-in-depth
+    // — even if a caller forgets to call emit afterward, the sentinel
+    // can't make it into an in-memory AST that pretends to be valid.
+    const ast = parseJsonc('{ "x": "ok" }').ast;
+    expect(() =>
+      setJsoncOcPath(ast, parseOcPath("oc://config/x"), {
+        kind: "string",
+        value: REDACTED_SENTINEL,
+      }),
+    ).toThrow(OcEmitSentinelError);
+  });
+
+  it("sentinel embedded in deep nesting — render mode catches the leaf", () => {
+    // Round-trip echoes the pre-existing bytes (the workspace contract:
+    // a parsed file containing the sentinel as data is not "writing" it
+    // on emit). Render mode walks every leaf and rejects this caller-
+    // injected pattern — and a `setOcPath` followed by emit lands here.
+    const raw = JSON.stringify({ a: { b: { c: REDACTED_SENTINEL } } });
+    const ast = parseJsonc(raw).ast;
+    expect(emitJsonc(ast)).toBe(raw); // round-trip echo
+    expect(() => emitJsonc(ast, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("sentinel inside an array element triggers guard in render mode", () => {
+    const raw = JSON.stringify({ arr: ["ok", REDACTED_SENTINEL, "ok"] });
+    const ast = parseJsonc(raw).ast;
+    expect(() => emitJsonc(ast, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("sentinel as object key in raw — strict mode catches it", () => {
+    const raw = `{ "${REDACTED_SENTINEL}": 1 }`;
+    const ast = parseJsonc(raw).ast;
+    expect(emitJsonc(ast)).toBe(raw); // default-mode echo
+    expect(() => emitJsonc(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("sentinel in jsonl malformed line — strict mode catches it", () => {
+    const raw = `${REDACTED_SENTINEL}\n`;
+    const ast = parseJsonl(raw).ast;
+    expect(emitJsonl(ast)).toBe(raw); // round-trip echoes verbatim
+    expect(() => emitJsonl(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("partial sentinel substring does NOT trigger guard", () => {
+    const raw = '{ "x": "OPENCLAW_REDACTED" }';
+    const ast = parseJsonc(raw).ast;
+    expect(() => emitJsonc(ast)).not.toThrow();
+  });
+
+  it("sentinel guard error message includes the OcPath context (render mode)", () => {
+    // Render mode is the path that actually rejects caller-injected
+    // sentinel — round-trip just echoes, so the error context surfaces
+    // when render walks the offending leaf and constructs the path.
+    const raw = `{ "secret": "${REDACTED_SENTINEL}" }`;
+    const ast = parseJsonc(raw).ast;
+    try {
+      emitJsonc(ast, { mode: "render", fileNameForGuard: "config" });
+      expect.fail("should have thrown");
+    } catch (e) {
+      expect(e).toBeInstanceOf(OcEmitSentinelError);
+      expect(String(e)).toContain("oc://");
+      expect(String(e)).toContain("config");
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/scenarios/sentinel-guard.test.ts

@@ -0,0 +1,164 @@
+// OC Path tests cover sentinel guard plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../../emit.js";
+import { parseMd } from "../../parse.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL, guardSentinel } from "../../sentinel.js";
+
+describe("sentinel-guard", () => {
+  it("sentinel constant matches the literal", () => {
+    expect(REDACTED_SENTINEL).toBe("__OPENCLAW_REDACTED__");
+  });
+
+  it("guardSentinel passes normal strings", () => {
+    expect(() => guardSentinel("safe", "oc://X.md")).not.toThrow();
+  });
+
+  it("guardSentinel passes non-string types", () => {
+    expect(() => guardSentinel(42, "oc://X.md")).not.toThrow();
+    expect(() => guardSentinel(null, "oc://X.md")).not.toThrow();
+    expect(() => guardSentinel(undefined, "oc://X.md")).not.toThrow();
+    expect(() => guardSentinel({}, "oc://X.md")).not.toThrow();
+  });
+
+  it("guardSentinel throws on exact match", () => {
+    expect(() => guardSentinel(REDACTED_SENTINEL, "oc://X.md")).toThrow(OcEmitSentinelError);
+  });
+
+  it("guardSentinel throws on substring matches (sentinel embedded in larger string)", () => {
+    // Substring scan — the sentinel anywhere in the value is a leak,
+    // not just exact equality. A hostile caller smuggling
+    // `prefix__OPENCLAW_REDACTED__suffix` would have bypassed the old
+    // equality check; substring scan closes the gap.
+    expect(() => guardSentinel(`prefix${REDACTED_SENTINEL}suffix`, "oc://X.md")).toThrow(
+      OcEmitSentinelError,
+    );
+  });
+
+  it("error attaches the OcPath context", () => {
+    try {
+      guardSentinel(REDACTED_SENTINEL, "oc://config/plugins.entries.foo.token");
+      expect.fail("should have thrown");
+    } catch (err) {
+      expect(err).toBeInstanceOf(OcEmitSentinelError);
+      const e = err as OcEmitSentinelError;
+      expect(e.path).toBe("oc://config/plugins.entries.foo.token");
+      expect(e.code).toBe("OC_EMIT_SENTINEL");
+    }
+  });
+
+  it("round-trip echoes pre-existing sentinel; strict mode rejects", () => {
+    const raw = "## Section\n\n- token: __OPENCLAW_REDACTED__\n";
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    expect(() => emitMd(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("round-trip emit allows sentinel-free content", () => {
+    const raw = "## Section\n\n- token: redacted-but-not-sentinel\n";
+    const { ast } = parseMd(raw);
+    expect(() => emitMd(ast)).not.toThrow();
+  });
+
+  it("render mode catches sentinel in frontmatter", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [{ key: "token", value: REDACTED_SENTINEL, line: 2 }],
+      preamble: "",
+      blocks: [],
+    };
+    expect(() => emitMd(ast, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("render mode catches sentinel in preamble", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [],
+      preamble: REDACTED_SENTINEL,
+      blocks: [],
+    };
+    expect(() => emitMd(ast, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("render mode catches sentinel in block bodyText", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [],
+      preamble: "",
+      blocks: [
+        {
+          heading: "Sec",
+          slug: "sec",
+          line: 1,
+          bodyText: REDACTED_SENTINEL,
+          items: [],
+          tables: [],
+          codeBlocks: [],
+        },
+      ],
+    };
+    expect(() => emitMd(ast, { mode: "render" })).toThrow(OcEmitSentinelError);
+  });
+
+  it("render mode catches sentinel in item kv.value", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [],
+      preamble: "",
+      blocks: [
+        {
+          heading: "S",
+          slug: "s",
+          line: 1,
+          bodyText: "- t: x",
+          items: [
+            {
+              text: "t: x",
+              slug: "t",
+              line: 2,
+              kv: { key: "t", value: REDACTED_SENTINEL },
+            },
+          ],
+          tables: [],
+          codeBlocks: [],
+        },
+      ],
+    };
+    expect(() => emitMd(ast, { mode: "render", fileNameForGuard: "AGENTS.md" })).toThrow(
+      OcEmitSentinelError,
+    );
+  });
+
+  it("sentinel-as-substring in raw — strict mode catches it", () => {
+    const raw = `Some prose ${REDACTED_SENTINEL} more prose.\n`;
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    expect(() => emitMd(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("multiple sentinel occurrences in raw — strict mode catches them", () => {
+    const raw = `## A\n${REDACTED_SENTINEL}\n${REDACTED_SENTINEL}\n`;
+    const { ast } = parseMd(raw);
+    expect(emitMd(ast)).toBe(raw);
+    expect(() => emitMd(ast, { acceptPreExistingSentinel: false })).toThrow(OcEmitSentinelError);
+  });
+
+  it("fileNameForGuard appears in the error path", () => {
+    const ast = {
+      kind: "md" as const,
+      raw: "",
+      frontmatter: [{ key: "token", value: REDACTED_SENTINEL, line: 2 }],
+      preamble: "",
+      blocks: [],
+    };
+    try {
+      emitMd(ast, { mode: "render", fileNameForGuard: "config" });
+      expect.fail("should have thrown");
+    } catch (err) {
+      expect((err as OcEmitSentinelError).path).toContain("config");
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/sentinel.test.ts

@@ -0,0 +1,33 @@
+// OC Path tests cover sentinel plugin behavior.
+import { describe, expect, it } from "vitest";
+import { OcEmitSentinelError, REDACTED_SENTINEL, guardSentinel } from "../sentinel.js";
+
+describe("guardSentinel", () => {
+  it("passes through normal strings", () => {
+    expect(() => guardSentinel("normal value", "oc://SOUL.md")).not.toThrow();
+  });
+
+  it("passes through non-string values", () => {
+    expect(() => guardSentinel(42, "oc://SOUL.md")).not.toThrow();
+    expect(() => guardSentinel(null, "oc://SOUL.md")).not.toThrow();
+    expect(() => guardSentinel(undefined, "oc://SOUL.md")).not.toThrow();
+  });
+
+  it("throws on the sentinel literal", () => {
+    expect(() => guardSentinel(REDACTED_SENTINEL, "oc://SOUL.md/[fm]/token")).toThrow(
+      OcEmitSentinelError,
+    );
+  });
+
+  it("attaches the OcPath in the error", () => {
+    try {
+      guardSentinel(REDACTED_SENTINEL, "oc://config/plugins.entries.foo.token");
+      expect.fail("should have thrown");
+    } catch (err) {
+      expect(err).toBeInstanceOf(OcEmitSentinelError);
+      const e = err as OcEmitSentinelError;
+      expect(e.path).toBe("oc://config/plugins.entries.foo.token");
+      expect(e.code).toBe("OC_EMIT_SENTINEL");
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/slug.test.ts

@@ -0,0 +1,51 @@
+// OC Path tests cover slug plugin behavior.
+import { describe, expect, it } from "vitest";
+import { slugify } from "../slug.js";
+
+describe("slugify", () => {
+  it("lowercases", () => {
+    expect(slugify("Boundaries")).toBe("boundaries");
+  });
+
+  it("replaces underscores with hyphens", () => {
+    expect(slugify("API_KEY")).toBe("api-key");
+  });
+
+  it("collapses multi-word headings", () => {
+    expect(slugify("Tool Guidance")).toBe("tool-guidance");
+  });
+
+  it("preserves existing kebab-case", () => {
+    expect(slugify("deny-rule-1")).toBe("deny-rule-1");
+  });
+
+  it("trims surrounding whitespace + non-slug chars", () => {
+    expect(slugify("  Restricted Data  ")).toBe("restricted-data");
+  });
+
+  it("handles colon + space patterns", () => {
+    expect(slugify("deny: secrets")).toBe("deny-secrets");
+  });
+
+  it("collapses repeated hyphens", () => {
+    expect(slugify("foo----bar")).toBe("foo-bar");
+  });
+
+  it("returns empty for non-slug-valid input", () => {
+    expect(slugify("!!")).toBe("");
+    expect(slugify("   ")).toBe("");
+  });
+
+  it("is idempotent", () => {
+    const inputs = ["Tool Guidance", "API_KEY", "deny-rule-1", "Multi-tenant isolation"];
+    for (const input of inputs) {
+      expect(slugify(slugify(input))).toBe(slugify(input));
+    }
+  });
+
+  it("handles unicode by stripping (current ASCII-only policy)", () => {
+    // Caveat: unicode in headings becomes empty/lossy. Document as a
+    // known limit; lint rules can flag non-ASCII headings if needed.
+    expect(slugify("Café")).toBe("caf");
+  });
+});

extensions/oc-path/src/oc-path/tests/universal.test.ts

@@ -0,0 +1,548 @@
+// OC Path tests cover universal plugin behavior.
+import { describe, expect, it } from "vitest";
+import { emitMd } from "../emit.js";
+import { emitJsonc } from "../jsonc/emit.js";
+import { parseJsonc } from "../jsonc/parse.js";
+import { emitJsonl } from "../jsonl/emit.js";
+import { parseJsonl } from "../jsonl/parse.js";
+import { parseOcPath } from "../oc-path.js";
+import { parseMd } from "../parse.js";
+import { detectInsertion, resolveOcPath, setOcPath } from "../universal.js";
+import { parseYaml } from "../yaml/parse.js";
+
+function expectLeaf(
+  match: ReturnType<typeof resolveOcPath>,
+  expected: { leafType: string; valueText: string },
+) {
+  expect(match?.kind).toBe("leaf");
+  if (match?.kind === "leaf") {
+    expect(match.leafType).toBe(expected.leafType);
+    expect(match.valueText).toBe(expected.valueText);
+  }
+}
+
+function expectNode(match: ReturnType<typeof resolveOcPath>, descriptor: string) {
+  expect(match?.kind).toBe("node");
+  if (match?.kind === "node") {
+    expect(match.descriptor).toBe(descriptor);
+  }
+}
+
+function expectInsertionPoint(match: ReturnType<typeof resolveOcPath>, container: string) {
+  expect(match?.kind).toBe("insertion-point");
+  if (match?.kind === "insertion-point") {
+    expect(match.container).toBe(container);
+  }
+}
+
+describe("detectInsertion", () => {
+  it("returns null for plain paths", () => {
+    expect(detectInsertion(parseOcPath("oc://X.md/section/item/field"))).toBeNull();
+  });
+
+  it("detects bare `+` end-insertion at section", () => {
+    const info = detectInsertion(parseOcPath("oc://X.md/tools/+"));
+    expect(info?.marker).toBe("+");
+    expect(info?.parentPath.section).toBe("tools");
+    expect(info?.parentPath.item).toBeUndefined();
+  });
+
+  it("detects `+key` keyed insertion", () => {
+    const info = detectInsertion(parseOcPath("oc://config/plugins/+gitlab"));
+    expect(info?.marker).toEqual({ kind: "keyed", key: "gitlab" });
+  });
+
+  it("detects `+nnn` indexed insertion", () => {
+    const info = detectInsertion(parseOcPath("oc://config/items/+2"));
+    expect(info?.marker).toEqual({ kind: "indexed", index: 2 });
+  });
+
+  it("detects file-root insertion", () => {
+    const info = detectInsertion(parseOcPath("oc://session.jsonl/+"));
+    expect(info?.marker).toBe("+");
+    expect(info?.parentPath.section).toBeUndefined();
+  });
+});
+
+describe("resolveOcPath — md AST", () => {
+  const md = parseMd("---\nname: github\n---\n\n## Boundaries\n\n- enabled: true\n").ast;
+
+  it("returns leaf with valueText for frontmatter entry", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/[frontmatter]/name"));
+    expectLeaf(m, { valueText: "github", leafType: "string" });
+  });
+
+  it("returns leaf for item-field", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/boundaries/enabled/enabled"));
+    expectLeaf(m, { valueText: "true", leafType: "string" });
+  });
+
+  it("returns node for block", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/boundaries"));
+    expectNode(m, "md-block");
+  });
+
+  it("returns root for file-only path", () => {
+    const m = resolveOcPath(md, parseOcPath("oc://X.md"));
+    expect(m?.kind).toBe("root");
+  });
+
+  it("returns null for unresolved", () => {
+    expect(resolveOcPath(md, parseOcPath("oc://X.md/missing"))).toBeNull();
+  });
+});
+
+describe("resolveOcPath — jsonc AST", () => {
+  const ast = parseJsonc('{ "k": 42, "s": "x", "b": true, "n": null, "arr": [1,2,3] }').ast;
+
+  it("returns leaf:number for numeric value", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/k"));
+    expectLeaf(m, { valueText: "42", leafType: "number" });
+  });
+
+  it("returns leaf:string for string value", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/s"));
+    expectLeaf(m, { valueText: "x", leafType: "string" });
+  });
+
+  it("returns leaf:boolean for bool value", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/b"));
+    expectLeaf(m, { valueText: "true", leafType: "boolean" });
+  });
+
+  it("returns leaf:null for null value", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/n"));
+    expectLeaf(m, { valueText: "null", leafType: "null" });
+  });
+
+  it("returns node:jsonc-array for array value", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/arr"));
+    expectNode(m, "jsonc-array");
+  });
+
+  it("returns leaf at array index", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://config/arr.1"));
+    expectLeaf(m, { valueText: "2", leafType: "number" });
+  });
+});
+
+describe("resolveOcPath — jsonl AST", () => {
+  const ast = parseJsonl('{"event":"start","n":1}\n{"event":"step","n":2}\n').ast;
+
+  it("returns node:jsonl-line for line address", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://log/L1"));
+    expectNode(m, "jsonl-line");
+  });
+
+  it("returns leaf for field on line", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://log/L2/event"));
+    expectLeaf(m, { valueText: "step", leafType: "string" });
+  });
+
+  it("returns leaf:number for $last/n", () => {
+    const m = resolveOcPath(ast, parseOcPath("oc://log/$last/n"));
+    expectLeaf(m, { valueText: "2", leafType: "number" });
+  });
+});
+
+describe("resolveOcPath — insertion-point detection", () => {
+  it("returns insertion-point for md section append", () => {
+    const md = parseMd("## Tools\n").ast;
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/tools/+"));
+    expectInsertionPoint(m, "md-section");
+  });
+
+  it("returns insertion-point for md file-level", () => {
+    const md = parseMd("## Tools\n").ast;
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/+"));
+    expectInsertionPoint(m, "md-file");
+  });
+
+  it("returns insertion-point for md frontmatter +key", () => {
+    const md = parseMd("---\nname: x\n---\n").ast;
+    const m = resolveOcPath(md, parseOcPath("oc://X.md/[frontmatter]/+description"));
+    expectInsertionPoint(m, "md-frontmatter");
+  });
+
+  it("returns insertion-point for jsonc array +", () => {
+    const ast = parseJsonc('{ "items": [1,2,3] }').ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://config/items/+"));
+    expectInsertionPoint(m, "jsonc-array");
+  });
+
+  it("returns insertion-point for jsonc object +key", () => {
+    const ast = parseJsonc('{ "plugins": {} }').ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://config/plugins/+gitlab"));
+    expectInsertionPoint(m, "jsonc-object");
+  });
+
+  it("returns insertion-point for jsonl file-root +", () => {
+    const ast = parseJsonl("").ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://log/+"));
+    expectInsertionPoint(m, "jsonl-file");
+  });
+
+  it("returns null when insertion target is not a container", () => {
+    const ast = parseJsonc('{ "k": 42 }').ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://config/k/+"));
+    expect(m).toBeNull();
+  });
+});
+
+describe("resolveOcPath — yaml AST", () => {
+  it("preserves source line lookup for numeric map keys", () => {
+    const ast = parseYaml("name: x\n1: one\n").ast;
+    const m = resolveOcPath(ast, parseOcPath("oc://workflow.yaml/1"));
+
+    expectLeaf(m, { valueText: "one", leafType: "string" });
+    expect(m?.line).toBe(2);
+  });
+});
+
+describe("setOcPath — md leaf", () => {
+  it("replaces frontmatter value", () => {
+    const md = parseMd("---\nname: old\n---\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/[frontmatter]/name"), "new");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.kind === "md" && r.ast.frontmatter[0]?.value).toBe("new");
+    }
+  });
+
+  it("replaces item kv value", () => {
+    const md = parseMd("## Boundaries\n\n- timeout: 5\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/boundaries/timeout/timeout"), "60");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitMd(r.ast as Parameters<typeof emitMd>[0]);
+      expect(out).toContain("- timeout: 60");
+    }
+  });
+
+  it("returns unresolved for missing path", () => {
+    const md = parseMd("").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/missing/x/x"), "v");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+});
+
+describe("setOcPath — jsonc leaf with coercion", () => {
+  it("replaces string leaf with string value", () => {
+    const ast = parseJsonc('{ "k": "old" }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/k"), "new");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ k: "new" });
+    }
+  });
+
+  it("coerces value to number when leaf was number", () => {
+    const ast = parseJsonc('{ "k": 1 }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/k"), "42");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ k: 42 });
+    }
+  });
+
+  it('coerces "true"/"false" when leaf was boolean', () => {
+    const ast = parseJsonc('{ "k": true }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/k"), "false");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ k: false });
+    }
+  });
+
+  it("rejects non-numeric string for number leaf", () => {
+    const ast = parseJsonc('{ "k": 1 }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/k"), "not-a-number");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+
+  it("rejects non-bool string for boolean leaf", () => {
+    const ast = parseJsonc('{ "k": true }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/k"), "maybe");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+
+  it("resolves slash-deep JSONC paths", () => {
+    const ast = parseJsonc(
+      '{ "agents": { "list": [{ "tools": { "exec": { "security": "deny" } } }] } }',
+    ).ast;
+    const r = setOcPath(
+      ast,
+      parseOcPath("oc://openclaw.json/agents/list/0/tools/exec/security"),
+      "allowlist",
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({
+        agents: { list: [{ tools: { exec: { security: "allowlist" } } }] },
+      });
+    }
+  });
+
+  it("keeps JSON-looking strings as strings by default", () => {
+    const ast = parseJsonc('{ "token": "${TOKEN}" }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://openclaw.json/token"), '{"source":"file"}');
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ token: '{"source":"file"}' });
+    }
+  });
+
+  it("replaces a JSONC leaf with parsed JSON when requested", () => {
+    const ast = parseJsonc('{ "token": "${TOKEN}" }').ast;
+    const r = setOcPath(
+      ast,
+      parseOcPath("oc://openclaw.json/token"),
+      '{"source":"file","provider":"secrets","id":"/test"}',
+      { valueJson: true },
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({
+        token: { source: "file", provider: "secrets", id: "/test" },
+      });
+    }
+  });
+
+  it("rejects non-finite parsed JSON replacement values", () => {
+    const ast = parseJsonc('{ "limit": 1 }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://openclaw.json/limit"), "1e999", {
+      valueJson: true,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+});
+
+describe("setOcPath — jsonl leaf", () => {
+  it("replaces field on a value line with coercion", () => {
+    const ast = parseJsonl('{"event":"start","n":1}\n').ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/L1/n"), "42");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitJsonl(r.ast as Parameters<typeof emitJsonl>[0]);
+      expect(JSON.parse(out.split("\n")[0])).toEqual({ event: "start", n: 42 });
+    }
+  });
+
+  it("replaces whole line via JSON value", () => {
+    const ast = parseJsonl('{"event":"start"}\n').ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/L1"), '{"event":"replaced"}');
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitJsonl(r.ast as Parameters<typeof emitJsonl>[0]);
+      expect(JSON.parse(out.split("\n")[0])).toEqual({ event: "replaced" });
+    }
+  });
+
+  it("rejects malformed JSON for whole-line replacement", () => {
+    const ast = parseJsonl('{"event":"start"}\n').ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/L1"), "not json");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+});
+
+describe("setOcPath — md insertion", () => {
+  it("appends item to section with `+`", () => {
+    const md = parseMd("## Tools\n\n- gh: GitHub CLI\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/tools/+"), "docker: container CLI");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitMd(r.ast as Parameters<typeof emitMd>[0]);
+      expect(out).toContain("- gh: GitHub CLI");
+      expect(out).toContain("- docker: container CLI");
+    }
+  });
+
+  it("appends new section at file root with `+`", () => {
+    const md = parseMd("## Existing\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/+"), "New Section");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitMd(r.ast as Parameters<typeof emitMd>[0]);
+      expect(out).toContain("## Existing");
+      expect(out).toContain("## New Section");
+    }
+  });
+
+  it("adds new frontmatter key with +key", () => {
+    const md = parseMd("---\nname: x\n---\n").ast;
+    const r = setOcPath(
+      md,
+      parseOcPath("oc://X.md/[frontmatter]/+description"),
+      "a new description",
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitMd(r.ast as Parameters<typeof emitMd>[0]);
+      expect(out).toContain("description: a new description");
+    }
+  });
+
+  it("rejects duplicate frontmatter key on insertion", () => {
+    const md = parseMd("---\nname: x\n---\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/[frontmatter]/+name"), "y");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("type-mismatch");
+    }
+  });
+});
+
+describe("setOcPath — jsonc insertion", () => {
+  it("appends to array with `+`", () => {
+    const ast = parseJsonc('{ "items": [1, 2] }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/items/+"), "3");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ items: [1, 2, 3] });
+    }
+  });
+
+  it("inserts at index with `+nnn`", () => {
+    const ast = parseJsonc('{ "items": [1, 3] }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/items/+1"), "2");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({ items: [1, 2, 3] });
+    }
+  });
+
+  it("adds object key with `+key`", () => {
+    const ast = parseJsonc('{ "plugins": { "github": "tok" } }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/plugins/+gitlab"), '"new-tok"');
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({
+        plugins: { github: "tok", gitlab: "new-tok" },
+      });
+    }
+  });
+
+  it("rejects duplicate object key", () => {
+    const ast = parseJsonc('{ "plugins": { "github": "x" } }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/plugins/+github"), '"y"');
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+
+  it("rejects +key on array", () => {
+    const ast = parseJsonc('{ "items": [1, 2] }').ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/items/+abc"), "3");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("type-mismatch");
+    }
+  });
+
+  it("inserts complex object via JSON value", () => {
+    const ast = parseJsonc('{ "plugins": {} }').ast;
+    const r = setOcPath(
+      ast,
+      parseOcPath("oc://config/plugins/+gitlab"),
+      '{"token":"xyz","enabled":true}',
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const ast2 = r.ast as Parameters<typeof emitJsonc>[0];
+      expect(JSON.parse(emitJsonc(ast2))).toEqual({
+        plugins: { gitlab: { token: "xyz", enabled: true } },
+      });
+    }
+  });
+});
+
+describe("setOcPath — jsonl insertion (session append)", () => {
+  it("appends a JSON line with `+`", () => {
+    const ast = parseJsonl('{"event":"start"}\n').ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/+"), '{"event":"step","n":1}');
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const out = emitJsonl(r.ast as Parameters<typeof emitJsonl>[0]);
+      const lines = out.split("\n").filter((l) => l.length > 0);
+      expect(lines).toHaveLength(2);
+      expect(JSON.parse(lines[1])).toEqual({ event: "step", n: 1 });
+    }
+  });
+
+  it("rejects malformed JSON value", () => {
+    const ast = parseJsonl("").ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/+"), "not json");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+
+  it("rejects non-root insertion target", () => {
+    const ast = parseJsonl('{"a":1}\n').ast;
+    const r = setOcPath(ast, parseOcPath("oc://log/L1/+"), "{}");
+    expect(r.ok).toBe(false);
+  });
+});
+
+describe("setOcPath — cross-cutting properties", () => {
+  it("is non-mutating across all kinds", () => {
+    const md = parseMd("---\nname: x\n---\n").ast;
+    const before = JSON.stringify(md);
+    setOcPath(md, parseOcPath("oc://X.md/[frontmatter]/name"), "new");
+    expect(JSON.stringify(md)).toBe(before);
+
+    const jsonc = parseJsonc('{ "k": 1 }').ast;
+    const before2 = JSON.stringify(jsonc);
+    setOcPath(jsonc, parseOcPath("oc://config/k"), "99");
+    expect(JSON.stringify(jsonc)).toBe(before2);
+
+    const jsonl = parseJsonl('{"a":1}\n').ast;
+    const before3 = JSON.stringify(jsonl);
+    setOcPath(jsonl, parseOcPath("oc://log/L1/a"), "99");
+    expect(JSON.stringify(jsonl)).toBe(before3);
+  });
+
+  it("returns ok-tagged result with new ast on success", () => {
+    const md = parseMd("---\nname: x\n---\n").ast;
+    const r = setOcPath(md, parseOcPath("oc://X.md/[frontmatter]/name"), "y");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.kind).toBe("md");
+    }
+  });
+
+  it("returns failure-tagged result with reason on unresolved", () => {
+    const ast = parseJsonc("{}").ast;
+    const r = setOcPath(ast, parseOcPath("oc://config/missing"), "v");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+});

extensions/oc-path/src/oc-path/tests/yaml/yaml-kind.test.ts

@@ -0,0 +1,333 @@
+// OC Path tests cover yaml kind plugin behavior.
+import { describe, expect, it } from "vitest";
+import { inferKind } from "../../dispatch.js";
+import { parseOcPath } from "../../oc-path.js";
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../../sentinel.js";
+import { resolveOcPath, setOcPath } from "../../universal.js";
+import { insertYamlOcPath, setYamlOcPath } from "../../yaml/edit.js";
+import { emitYaml } from "../../yaml/emit.js";
+import { parseYaml } from "../../yaml/parse.js";
+import { resolveYamlOcPath } from "../../yaml/resolve.js";
+
+const LOBSTER = `name: inbox-triage
+description: A simple example workflow
+
+steps:
+  - id: fetch
+    command: gog.gmail.search --query 'newer_than:1d' --max 20
+
+  - id: classify
+    command: openclaw.invoke --tool llm-task --action json
+    stdin: $fetch.stdout
+`;
+
+describe("parseYaml — round-trip", () => {
+  it("preserves bytes verbatim on round-trip", () => {
+    const { ast } = parseYaml(LOBSTER);
+    expect(emitYaml(ast)).toBe(LOBSTER);
+  });
+
+  it("exposes kind: yaml discriminator", () => {
+    const { ast } = parseYaml(LOBSTER);
+    expect(ast.kind).toBe("yaml");
+  });
+
+  it("handles empty file", () => {
+    const { ast } = parseYaml("");
+    expect(ast.kind).toBe("yaml");
+    expect(emitYaml(ast)).toBe("");
+  });
+
+  it("reports errors as diagnostics, not throws", () => {
+    const { diagnostics } = parseYaml("key: value\n  bad indent: oops\n");
+    expect(diagnostics.length).toBeGreaterThan(0);
+  });
+});
+
+describe("resolveYamlOcPath — direct", () => {
+  it("resolves top-level scalar", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveYamlOcPath(ast, parseOcPath("oc://workflow.lobster/name"));
+    expect(m?.kind).toBe("pair");
+    if (m?.kind === "pair") {
+      expect(m.value).toBe("inbox-triage");
+    }
+  });
+
+  it("resolves into a sequence by index", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveYamlOcPath(ast, parseOcPath("oc://workflow.lobster/steps.0.id"));
+    expect(m?.kind).toBe("pair");
+    if (m?.kind === "pair") {
+      expect(m.value).toBe("fetch");
+    }
+  });
+
+  it("does not resolve noncanonical sequence indexes", () => {
+    const { ast } = parseYaml(LOBSTER);
+    expect(resolveYamlOcPath(ast, parseOcPath("oc://workflow.lobster/steps.01.id"))).toBeNull();
+  });
+
+  it("returns root when no segments", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveYamlOcPath(ast, parseOcPath("oc://workflow.lobster"));
+    expect(m?.kind).toBe("root");
+  });
+
+  it("returns null for unresolved paths", () => {
+    const { ast } = parseYaml(LOBSTER);
+    expect(resolveYamlOcPath(ast, parseOcPath("oc://workflow.lobster/missing"))).toBeNull();
+  });
+});
+
+describe("setYamlOcPath — direct", () => {
+  it("replaces a scalar value", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(ast, parseOcPath("oc://workflow.lobster/name"), "new-name");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("name: new-name");
+    }
+  });
+
+  it("replaces a nested scalar", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(ast, parseOcPath("oc://workflow.lobster/steps.0.id"), "fetch-renamed");
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("id: fetch-renamed");
+    }
+  });
+
+  it("reports unresolved for noncanonical sequence indexes", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(ast, parseOcPath("oc://workflow.lobster/steps.01.id"), "nope");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+
+  it("returns unresolved for missing path", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(ast, parseOcPath("oc://workflow.lobster/missing"), "x");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+
+  it("returns parse-error before editing a malformed document", () => {
+    const { ast } = parseYaml("key: value\n  bad indent: oops\n");
+    const r = setYamlOcPath(ast, parseOcPath("oc://workflow.yaml/key"), "new-value");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+
+  it("returns parse-error before inserting into a malformed document", () => {
+    const { ast } = parseYaml("key: value\n  bad indent: oops\n");
+    const r = insertYamlOcPath(
+      ast,
+      parseOcPath("oc://workflow.yaml"),
+      { kind: "keyed", key: "next" },
+      "x",
+    );
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+});
+
+describe("setYamlOcPath — positional tokens", () => {
+  it("edits the first seq element via $first", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(
+      ast,
+      parseOcPath("oc://workflow.lobster/steps/$first/id"),
+      "fetch-renamed",
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("id: fetch-renamed");
+    }
+  });
+
+  it("edits the last seq element via $last", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setYamlOcPath(
+      ast,
+      parseOcPath("oc://workflow.lobster/steps/$last/id"),
+      "classify-renamed",
+    );
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("id: classify-renamed");
+    }
+  });
+
+  it("edits the first map entry via $first", () => {
+    const { ast } = parseYaml("config:\n  a: 1\n  b: 2\n  c: 3\n");
+    const r = setYamlOcPath(ast, parseOcPath("oc://x.yaml/config/$first"), 99);
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("a: 99");
+    }
+  });
+
+  it("edits the last map entry via $last", () => {
+    const { ast } = parseYaml("config:\n  a: 1\n  b: 2\n  c: 3\n");
+    const r = setYamlOcPath(ast, parseOcPath("oc://x.yaml/config/$last"), 99);
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      expect(r.ast.raw).toContain("c: 99");
+    }
+  });
+
+  it("returns unresolved for $last against an empty seq", () => {
+    const { ast } = parseYaml("items: []\n");
+    const r = setYamlOcPath(ast, parseOcPath("oc://x.yaml/items/$last"), "x");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("unresolved");
+    }
+  });
+});
+
+describe("inferKind — yaml extensions", () => {
+  it("maps .yaml / .yml / .lobster to yaml", () => {
+    expect(inferKind("workflow.yaml")).toBe("yaml");
+    expect(inferKind("config.yml")).toBe("yaml");
+    expect(inferKind("inbox-triage.lobster")).toBe("yaml");
+  });
+});
+
+describe("universal verbs — yaml dispatch", () => {
+  it("resolveOcPath returns kind-agnostic match for yaml leaf", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveOcPath(ast, parseOcPath("oc://workflow.lobster/name"));
+    expect(m).toMatchObject({ kind: "leaf", valueText: "inbox-triage", leafType: "string" });
+  });
+
+  it("resolveOcPath returns node:yaml-map for top-level seq item", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveOcPath(ast, parseOcPath("oc://workflow.lobster/steps.0"));
+    expect(m).toMatchObject({ kind: "node", descriptor: "yaml-map" });
+  });
+
+  it("resolveOcPath returns node:yaml-seq for sequence root", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const m = resolveOcPath(ast, parseOcPath("oc://workflow.lobster/steps"));
+    expect(m).toMatchObject({ kind: "node", descriptor: "yaml-seq" });
+  });
+
+  it("resolveOcPath returns yaml-map insertion for map root", () => {
+    const { ast } = parseYaml("name: inbox\n");
+    const m = resolveOcPath(ast, parseOcPath("oc://workflow.yaml/+owner"));
+    expect(m).toMatchObject({ kind: "insertion-point", container: "yaml-map" });
+  });
+
+  it("resolveOcPath returns yaml-seq insertion for sequence root", () => {
+    const { ast } = parseYaml("- a\n");
+    const m = resolveOcPath(ast, parseOcPath("oc://items.yaml/+"));
+    expect(m).toMatchObject({ kind: "insertion-point", container: "yaml-seq" });
+  });
+
+  it("resolveOcPath rejects insertion under scalar root", () => {
+    const { ast } = parseYaml("hello\n");
+    const m = resolveOcPath(ast, parseOcPath("oc://value.yaml/+"));
+    expect(m).toBeNull();
+  });
+
+  it("setOcPath replaces a yaml scalar via universal verb", () => {
+    const { ast } = parseYaml(LOBSTER);
+    const r = setOcPath(ast, parseOcPath("oc://workflow.lobster/name"), "updated");
+    expect(r.ok).toBe(true);
+    if (r.ok && r.ast.kind === "yaml") {
+      expect(r.ast.raw).toContain("name: updated");
+    }
+  });
+
+  it("setOcPath coerces numeric string to number for number leaf", () => {
+    const { ast } = parseYaml("count: 5\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/count"), "42");
+    expect(r.ok).toBe(true);
+    if (r.ok && r.ast.kind === "yaml") {
+      expect(r.ast.raw).toContain("count: 42");
+    }
+  });
+
+  it("setOcPath returns parse-error for invalid coercion", () => {
+    const { ast } = parseYaml("count: 5\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/count"), "abc");
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.reason).toBe("parse-error");
+    }
+  });
+});
+
+describe("universal verbs — yaml insertion", () => {
+  it("appends to a yaml seq with `+`", () => {
+    const { ast } = parseYaml("items:\n  - a\n  - b\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/items/+"), '"c"');
+    expect(r.ok).toBe(true);
+    if (r.ok && r.ast.kind === "yaml") {
+      expect(r.ast.raw).toContain("- c");
+    }
+  });
+
+  it("appends to an empty yaml seq with `+`", () => {
+    const { ast } = parseYaml("items: []\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/items/+"), '"a"');
+    expect(r.ok).toBe(true);
+    if (r.ok && r.ast.kind === "yaml") {
+      expect(r.ast.raw).toContain("items: [ a ]");
+    }
+  });
+
+  it("adds key to yaml map with `+key`", () => {
+    const { ast } = parseYaml("config:\n  a: 1\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/config/+b"), "2");
+    expect(r.ok).toBe(true);
+    if (r.ok && r.ast.kind === "yaml") {
+      expect(r.ast.raw).toContain("b: 2");
+    }
+  });
+
+  it("rejects duplicate map key on insertion", () => {
+    const { ast } = parseYaml("config:\n  a: 1\n");
+    const r = setOcPath(ast, parseOcPath("oc://x.yaml/config/+a"), "99");
+    expect(r.ok).toBe(false);
+  });
+
+  it("rejects sentinel-bearing yaml replacements before raw emit", () => {
+    const { ast } = parseYaml("token: safe\n");
+    expect(() => setOcPath(ast, parseOcPath("oc://x.yaml/token"), REDACTED_SENTINEL)).toThrow(
+      OcEmitSentinelError,
+    );
+  });
+
+  it("rejects sentinel-bearing yaml insertions before raw emit", () => {
+    const { ast } = parseYaml("items: []\n");
+    expect(() =>
+      setOcPath(ast, parseOcPath("oc://x.yaml/items/+"), `{"token":"${REDACTED_SENTINEL}"}`),
+    ).toThrow(OcEmitSentinelError);
+  });
+
+  it("rejects sentinel-bearing yaml insertion keys before raw emit", () => {
+    const { ast } = parseYaml("config:\n  safe: 1\n");
+    expect(() =>
+      setOcPath(ast, parseOcPath(`oc://x.yaml/config/+${REDACTED_SENTINEL}`), "2"),
+    ).toThrow(OcEmitSentinelError);
+  });
+
+  it("rejects sentinel-bearing yaml object keys before raw emit", () => {
+    const { ast } = parseYaml("items: []\n");
+    expect(() =>
+      setOcPath(ast, parseOcPath("oc://x.yaml/items/+"), `{"${REDACTED_SENTINEL}":"2"}`),
+    ).toThrow(OcEmitSentinelError);
+  });
+});

extensions/oc-path/src/oc-path/yaml/ast.ts

@@ -0,0 +1,9 @@
+// OC Path module implements ast behavior.
+import type { Document, LineCounter } from "yaml";
+
+export interface YamlAst {
+  readonly kind: "yaml";
+  readonly raw: string;
+  readonly doc: Document.Parsed;
+  readonly lineCounter: LineCounter;
+}

extensions/oc-path/src/oc-path/yaml/edit.ts

@@ -0,0 +1,219 @@
+// OC Path module implements edit behavior.
+import {
+  Document,
+  isMap,
+  isScalar,
+  isSeq,
+  LineCounter,
+  parseDocument,
+  type Node,
+  type Pair,
+} from "yaml";
+import type { OcPath } from "../oc-path.js";
+import {
+  formatOcPath,
+  isPositionalSeg,
+  isQuotedSeg,
+  parseArrayIndexSegment,
+  resolvePositionalSeg,
+  splitRespectingBrackets,
+  unquoteSeg,
+} from "../oc-path.js";
+import { guardSentinel } from "../sentinel.js";
+import type { YamlAst } from "./ast.js";
+
+export type YamlEditResult =
+  | { readonly ok: true; readonly ast: YamlAst }
+  | {
+      readonly ok: false;
+      readonly reason: "unresolved" | "no-root" | "parse-error";
+    };
+
+export function setYamlOcPath(ast: YamlAst, path: OcPath, newValue: unknown): YamlEditResult {
+  if (hasYamlParseErrors(ast)) {
+    return { ok: false, reason: "parse-error" };
+  }
+  if (ast.doc.contents === null) {
+    return { ok: false, reason: "no-root" };
+  }
+  guardYamlSentinel(newValue, formatOcPath(path));
+
+  const rawSegments = pathSegments(path);
+  if (rawSegments.length === 0) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const segments = resolvePositionalSegments(ast.doc.contents as Node, rawSegments);
+  if (segments === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  if (!ast.doc.hasIn(segments)) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  const { doc: cloned, lineCounter } = cloneDoc(ast.doc);
+  cloned.setIn(segments, newValue);
+  return { ok: true, ast: { kind: "yaml", raw: cloned.toString(), doc: cloned, lineCounter } };
+}
+
+export function insertYamlOcPath(
+  ast: YamlAst,
+  parentPath: OcPath,
+  marker: "+" | { kind: "keyed"; key: string } | { kind: "indexed"; index: number },
+  newValue: unknown,
+): YamlEditResult {
+  if (hasYamlParseErrors(ast)) {
+    return { ok: false, reason: "parse-error" };
+  }
+  if (ast.doc.contents === null) {
+    return { ok: false, reason: "no-root" };
+  }
+  guardYamlSentinel(newValue, `${formatOcPath(parentPath)}/${formatInsertionMarker(marker)}`);
+
+  const rawParentSegments = pathSegments(parentPath);
+  const segments =
+    rawParentSegments.length === 0
+      ? rawParentSegments
+      : resolvePositionalSegments(ast.doc.contents as Node, rawParentSegments);
+  if (segments === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+  const { doc: cloned, lineCounter } = cloneDoc(ast.doc);
+
+  const parent = segments.length === 0 ? cloned.contents : cloned.getIn(segments, false);
+  if (parent === undefined || parent === null) {
+    return { ok: false, reason: "unresolved" };
+  }
+
+  if (isMap(parent)) {
+    if (typeof marker !== "object" || marker.kind !== "keyed") {
+      return { ok: false, reason: "unresolved" };
+    }
+    guardSentinel(marker.key, `${formatOcPath(parentPath)}/${formatInsertionMarker(marker)}`);
+    if (cloned.hasIn([...segments, marker.key])) {
+      return { ok: false, reason: "unresolved" };
+    }
+    cloned.setIn([...segments, marker.key], newValue);
+    return { ok: true, ast: { kind: "yaml", raw: cloned.toString(), doc: cloned, lineCounter } };
+  }
+
+  if (isSeq(parent)) {
+    if (typeof marker === "object" && marker.kind === "keyed") {
+      return { ok: false, reason: "unresolved" };
+    }
+    if (marker === "+") {
+      cloned.addIn(segments, newValue);
+    } else if (typeof marker === "object" && marker.kind === "indexed") {
+      const idx = Math.min(marker.index, parent.items.length);
+      parent.items.splice(idx, 0, cloned.createNode(newValue) as Node);
+    }
+    return { ok: true, ast: { kind: "yaml", raw: cloned.toString(), doc: cloned, lineCounter } };
+  }
+
+  return { ok: false, reason: "unresolved" };
+}
+
+function resolvePositionalSegments(root: Node, segments: readonly string[]): string[] | null {
+  const out: string[] = [];
+  let node: Node | null = root;
+  for (const seg of segments) {
+    if (node === null) {
+      return null;
+    }
+    let segNorm = seg;
+    if (isPositionalSeg(seg)) {
+      const concrete = positionalForYamlNode(node, seg);
+      if (concrete === null) {
+        return null;
+      }
+      segNorm = concrete;
+    }
+    out.push(segNorm);
+    if (isMap(node)) {
+      const pairs: readonly Pair[] = (node as { items: readonly Pair[] }).items;
+      const pair: Pair | undefined = pairs.find((p) => {
+        const k = isScalar(p.key) ? p.key.value : p.key;
+        return String(k) === segNorm;
+      });
+      node = (pair?.value as Node | undefined) ?? null;
+      continue;
+    }
+    if (isSeq(node)) {
+      const idx = parseArrayIndexSegment(segNorm, node.items.length);
+      if (idx === null) {
+        return null;
+      }
+      node = (node.items[idx] as Node | null) ?? null;
+      continue;
+    }
+    node = null;
+  }
+  return out;
+}
+
+function positionalForYamlNode(node: Node, seg: string): string | null {
+  if (isMap(node)) {
+    const pairs: readonly Pair[] = (node as { items: readonly Pair[] }).items;
+    const keys: readonly string[] = pairs.map((p) => String(isScalar(p.key) ? p.key.value : p.key));
+    return resolvePositionalSeg(seg, { indexable: false, size: keys.length, keys });
+  }
+  if (isSeq(node)) {
+    const items: readonly Node[] = (node as { items: readonly Node[] }).items;
+    return resolvePositionalSeg(seg, { indexable: true, size: items.length });
+  }
+  return null;
+}
+
+function pathSegments(path: OcPath): string[] {
+  const segs: string[] = [];
+  const collect = (slot: string | undefined) => {
+    if (slot === undefined) {
+      return;
+    }
+    for (const sub of splitRespectingBrackets(slot, ".")) {
+      segs.push(isQuotedSeg(sub) ? unquoteSeg(sub) : sub);
+    }
+  };
+  collect(path.section);
+  collect(path.item);
+  collect(path.field);
+  return segs;
+}
+
+function formatInsertionMarker(
+  marker: "+" | { kind: "keyed"; key: string } | { kind: "indexed"; index: number },
+): string {
+  if (marker === "+") {
+    return "+";
+  }
+  return marker.kind === "keyed" ? `+${marker.key}` : `+${marker.index}`;
+}
+
+function guardYamlSentinel(value: unknown, ocPath: string): void {
+  guardSentinel(value, ocPath);
+  if (Array.isArray(value)) {
+    value.forEach((item, index) => guardYamlSentinel(item, `${ocPath}/${index}`));
+    return;
+  }
+  if (value !== null && typeof value === "object") {
+    for (const [key, child] of Object.entries(value as Record<string, unknown>)) {
+      guardSentinel(key, `${ocPath}/${key}`);
+      guardYamlSentinel(child, `${ocPath}/${key}`);
+    }
+  }
+}
+
+function hasYamlParseErrors(ast: YamlAst): boolean {
+  return ast.doc.errors.length > 0;
+}
+
+function cloneDoc(doc: Document.Parsed): { doc: Document.Parsed; lineCounter: LineCounter } {
+  const lineCounter = new LineCounter();
+  const cloned = parseDocument(doc.toString(), {
+    keepSourceTokens: true,
+    prettyErrors: false,
+    lineCounter,
+  });
+  return { doc: cloned, lineCounter };
+}

extensions/oc-path/src/oc-path/yaml/emit.ts

@@ -0,0 +1,28 @@
+// OC Path module implements emit behavior.
+import { OcEmitSentinelError, REDACTED_SENTINEL } from "../sentinel.js";
+import type { YamlAst } from "./ast.js";
+
+export interface YamlEmitOptions {
+  readonly mode?: "roundtrip" | "render";
+  readonly fileNameForGuard?: string;
+  readonly acceptPreExistingSentinel?: boolean;
+}
+
+export function emitYaml(ast: YamlAst, opts: YamlEmitOptions = {}): string {
+  const mode = opts.mode ?? "roundtrip";
+  const guardPath = opts.fileNameForGuard ? `oc://${opts.fileNameForGuard}` : "oc://";
+  const acceptPreExisting = opts.acceptPreExistingSentinel ?? true;
+
+  if (mode === "roundtrip") {
+    if (!acceptPreExisting && ast.raw.includes(REDACTED_SENTINEL)) {
+      throw new OcEmitSentinelError(`${guardPath}/[raw]`);
+    }
+    return ast.raw;
+  }
+
+  const rendered = ast.doc.toString();
+  if (rendered.includes(REDACTED_SENTINEL)) {
+    throw new OcEmitSentinelError(`${guardPath}/[rendered]`);
+  }
+  return rendered;
+}

extensions/oc-path/src/oc-path/yaml/parse.ts

@@ -0,0 +1,36 @@
+// OC Path module implements parse behavior.
+import { LineCounter, parseDocument } from "yaml";
+import type { Diagnostic } from "../ast.js";
+import type { YamlAst } from "./ast.js";
+
+export interface YamlParseResult {
+  readonly ast: YamlAst;
+  readonly diagnostics: readonly Diagnostic[];
+}
+
+export function parseYaml(raw: string): YamlParseResult {
+  const lineCounter = new LineCounter();
+  const doc = parseDocument(raw, {
+    keepSourceTokens: true,
+    prettyErrors: false,
+    lineCounter,
+  });
+  const diagnostics: Diagnostic[] = [];
+  for (const w of doc.warnings) {
+    diagnostics.push({
+      line: w.linePos?.[0]?.line ?? 1,
+      message: w.message,
+      severity: "warning",
+      code: "OC_YAML_WARN",
+    });
+  }
+  for (const e of doc.errors) {
+    diagnostics.push({
+      line: e.linePos?.[0]?.line ?? 1,
+      message: e.message,
+      severity: "error",
+      code: "OC_YAML_PARSE_FAILED",
+    });
+  }
+  return { ast: { kind: "yaml", raw, doc, lineCounter }, diagnostics };
+}

extensions/oc-path/src/oc-path/yaml/resolve.ts

@@ -0,0 +1,143 @@
+// OC Path module implements resolve behavior.
+import { isMap, isScalar, isSeq, type Node, type Pair } from "yaml";
+import type { OcPath } from "../oc-path.js";
+import {
+  isPositionalSeg,
+  isQuotedSeg,
+  parseArrayIndexSegment,
+  resolvePositionalSeg,
+  splitRespectingBrackets,
+  unquoteSeg,
+} from "../oc-path.js";
+import type { YamlAst } from "./ast.js";
+
+export type YamlOcPathMatch =
+  | { readonly kind: "root"; readonly node: YamlAst }
+  | { readonly kind: "scalar"; readonly value: unknown; readonly path: readonly string[] }
+  | {
+      readonly kind: "map";
+      readonly path: readonly string[];
+    }
+  | {
+      readonly kind: "seq";
+      readonly path: readonly string[];
+    }
+  | {
+      readonly kind: "pair";
+      readonly key: string;
+      readonly value: unknown;
+      readonly path: readonly string[];
+    };
+
+export function resolveYamlOcPath(ast: YamlAst, path: OcPath): YamlOcPathMatch | null {
+  const segments: string[] = [];
+  if (path.section !== undefined) {
+    for (const s of splitRespectingBrackets(path.section, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  }
+  if (path.item !== undefined) {
+    for (const s of splitRespectingBrackets(path.item, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  }
+  if (path.field !== undefined) {
+    for (const s of splitRespectingBrackets(path.field, ".")) {
+      segments.push(isQuotedSeg(s) ? unquoteSeg(s) : s);
+    }
+  }
+
+  if (segments.length === 0) {
+    return { kind: "root", node: ast };
+  }
+
+  const root = ast.doc.contents;
+  if (root === null) {
+    return null;
+  }
+
+  return walkNode(root, segments, 0, []);
+}
+
+function walkNode(
+  node: Node | null,
+  segments: readonly string[],
+  i: number,
+  walked: readonly string[],
+): YamlOcPathMatch | null {
+  if (node === null) {
+    return null;
+  }
+  let seg = segments[i];
+
+  if (seg === undefined) {
+    if (isMap(node)) {
+      return { kind: "map", path: walked };
+    }
+    if (isSeq(node)) {
+      return { kind: "seq", path: walked };
+    }
+    if (isScalar(node)) {
+      return { kind: "scalar", value: node.value, path: walked };
+    }
+    return null;
+  }
+  if (seg.length === 0) {
+    return null;
+  }
+
+  if (isPositionalSeg(seg)) {
+    const concrete = positionalForYaml(node, seg);
+    if (concrete !== null) {
+      seg = concrete;
+    }
+  }
+
+  if (isMap(node)) {
+    const pair = (node as { items: Pair[] }).items.find((p) => {
+      const k = isScalar(p.key) ? p.key.value : p.key;
+      return String(k) === seg;
+    });
+    if (pair === undefined) {
+      return null;
+    }
+    const childWalked = [...walked, seg];
+    if (i === segments.length - 1) {
+      const child = pair.value;
+      if (isScalar(child)) {
+        return {
+          kind: "pair",
+          key: seg,
+          value: child.value,
+          path: childWalked,
+        };
+      }
+      return walkNode(child as Node, segments, i + 1, childWalked);
+    }
+    return walkNode(pair.value as Node, segments, i + 1, childWalked);
+  }
+
+  if (isSeq(node)) {
+    const idx = parseArrayIndexSegment(seg, node.items.length);
+    if (idx === null) {
+      return null;
+    }
+    const child = node.items[idx];
+    return walkNode(child as Node, segments, i + 1, [...walked, seg]);
+  }
+
+  return null;
+}
+
+function positionalForYaml(node: Node, seg: string): string | null {
+  if (isMap(node)) {
+    const pairs = (node as { items: Pair[] }).items;
+    const keys = pairs.map((p) => String(isScalar(p.key) ? p.key.value : p.key));
+    return resolvePositionalSeg(seg, { indexable: false, size: keys.length, keys });
+  }
+  if (isSeq(node)) {
+    const items = (node as { items: Node[] }).items;
+    return resolvePositionalSeg(seg, { indexable: true, size: items.length });
+  }
+  return null;
+}