Merge remote-tracking branch 'origin/master' into persistence-log-catalog

# Conflicts:
#	packages/hooks/hook-protocol/README.md
#	packages/hooks/hook-protocol/src/types.ts

packages/hooks/hook-protocol/README.md

@@ -12,18 +12,18 @@ Why a shared lib at all: Codex deliberately reimplements a *subset* of the Claud
 | Run a hook | `runHook(bash, hook, opts, now)` — stdin payload + env via `ctx.bash`, decode | builds the per-event stdin **payload** + the dialect's **env** |
 | Decode output | `parseHookOutput(exit, stdout, stderr)` → neutral `HookOutput` | maps the neutral `HookOutput` onto a seam-specific typed Decision |
 | Merge N hooks | `mergeHookOutputs(outputs)` → most-restrictive `MergedHookOutcome` | — |
-| Durable record | `appendHookInvoked` / `appendHookResult` (`hook/*` session events) | calls them around each invocation |
+| Durable record | `appendHookInvoked` / `appendHookResult` (`hook/*` session events; the result's `decision`/`stderrSummary` derive from the `HookOutput` here) | calls them around each invocation |
 
 ## Primitives
 
 - **`matchesMatcher(matcher, query, mode)`** — match-all on absent/`''`/`'*'`; `claude` mode treats a pure `[A-Za-z0-9_|]+` pattern as a literal (pipe = exact-match alternation) and anything else as a regex; `codex` mode is always an unanchored regex. An invalid regex matches nothing (never throws).
-- **`runHook(bash, hook, options, now)`** — serialize `options.payload` to the hook's stdin (with a trailing newline iff `options.trailingNewline`), merge `options.env` after the executor's credential scrub (the `dsh-bash` trusted-plugin surface), honor the hook's `timeoutSec` (else `defaultTimeoutMs`), and decode the result (threading `options.expectedEventName` to the codec). Never throws: an executor rejection (infra fault) becomes a `HookOutput` with `exitCode: undefined` (a non-blocking error). `now` is injected for testable durations.
-- **`parseHookOutput(exitCode, stdout, stderr, expectedEventName?)`** — the exit-code + structured-stdout codec. Exit `0` → parse JSON stdout (lenient: non-JSON is left for the bridge); exit `2` → blocking error, `stderr` is the block reason (surfaced as `decision: 'block'`); other → non-blocking error. `hookSpecificOutput.permissionDecision` (allow/deny/ask) overrides a legacy top-level `decision`; `additionalContext`/`updatedInput`/`systemMessage`/`continue`/`stopReason`/`suppressOutput` are parsed too. The schemas key the `hookSpecificOutput` block by `hookEventName`, so passing `expectedEventName` (the firing event) DISCARDS a block whose `hookEventName` names a different event — or omits it entirely — its event-scoped fields don't take effect (a `PreToolUse` block on a `Stop` hook is malformed, and so is a discriminator-less block that would otherwise apply to any event), while the event-agnostic top-level fields still apply. Pure and total.
+- **`runHook(bash, hook, options, now)`** — serialize `options.payload` to the hook's stdin (with a trailing newline iff `options.trailingNewline`), merge `options.env` after the executor's credential scrub (the `dsh-bash` trusted-plugin surface), honor the hook's `timeoutSec` (else `options.defaultTimeoutMs` — the bridge owns the default, its config defaulting to the lib's `DEFAULT_HOOK_TIMEOUT_MS` 10-minute reference), and decode the result (threading `options.expectedEventName` to the codec). Never throws: an executor rejection (infra fault) becomes a `HookOutput` with `exitCode: undefined` (a non-blocking error). `now` is injected for testable durations.
+- **`parseHookOutput(exitCode, stdout, stderr, expectedEventName?)`** — the exit-code + structured-stdout codec. Exit `0` → parse JSON stdout (lenient: non-JSON is left for the bridge); exit `2` → blocking error, `stderr` is the block reason (surfaced as `decision: 'block'`); other → non-blocking error. `hookSpecificOutput.permissionDecision` (allow/deny/ask) overrides a legacy top-level `decision`; `additionalContext`/`updatedInput`/`systemMessage`/`continue`/`stopReason` are parsed too. The schemas key the `hookSpecificOutput` block by `hookEventName`, so passing `expectedEventName` (the firing event) DISCARDS a block whose `hookEventName` names a different event — or omits it entirely — its event-scoped fields don't take effect (a `PreToolUse` block on a `Stop` hook is malformed, and so is a discriminator-less block that would otherwise apply to any event), while the event-agnostic top-level fields still apply. Pure and total.
 - **`mergeHookOutputs(outputs)`** — fold the results of every hook that matched one point: permission precedence **deny > ask > allow**, halt sticky on the first `continue:false`, block reasons joined with `\n\n`, `additionalContext`/`systemMessages` accumulated in order.
 
 ## `hook/*` session events
 
-Declaration-merged into `SessionEventMap` (log-only, like `compact/*` — NOT a `SurfaceEventType`, no `surfaceOp`): `hook/invoked` (a hook command ran) and `hook/result` (its outcome, paired by `handlerId`). Payloads and per-event JSDoc are in the generated [persistence log event catalog](../../../docs/persistence-catalog/log-events.md).
+Declaration-merged into `SessionEventMap` (log-only, like `compact/*` — NOT a `SurfaceEventType`, no `surfaceOp`): `hook/invoked` (a hook command ran) and `hook/result` (its outcome, paired by `handlerId`, with `appendHookResult` owning the decision rule). Payloads and per-event JSDoc are in the generated [persistence log event catalog](../../../docs/persistence-catalog/log-events.md); `stderrSummary` is truncated to the record's `stderrSummaryMaxChars` (the bridge's config, reference default `DEFAULT_STDERR_SUMMARY_MAX_CHARS` = 500; omitted when empty).
 
 Like every event they must sit inside an open turn. The mid-turn points (`PreToolUse`/`PostToolUse`/`UserPromptSubmit`/`Stop`) fire inside the loop's open turn by construction; `SessionStart` gets no `hook/*` record (its injected `context/message` is the durable evidence) — see the hooks RFC.
 

packages/hooks/hook-protocol/src/codec.ts

@@ -21,7 +21,7 @@
 import type { HookOutput } from './types.ts'
 
 /** The exit code a hook uses to signal a blocking error (stderr → model). */
-export const BLOCKING_EXIT_CODE = 2
+const BLOCKING_EXIT_CODE = 2
 
 /** Read a string field from a parsed object, or `undefined` if absent/wrong type. */
 function str(obj: Record<string, unknown>, key: string): string | undefined {
@@ -72,7 +72,7 @@ function permissionDecisionOf(value: string | undefined): HookOutput['decision']
  * `additionalContext`/`updatedInput`) are DISCARDED — a `PreToolUse` block on a
  * `Stop` hook must not deny the `Stop`. The block's `hookEventName` is still
  * surfaced (for the log/diagnostics), and the event-agnostic top-level fields
- * (`decision`/`reason`/`continue`/`stopReason`/`suppressOutput`/`systemMessage`)
+ * (`decision`/`reason`/`continue`/`stopReason`/`systemMessage`)
  * are unaffected. Omit `expectedEventName` (or pass a matching one) to apply the
  * block as-is — a caller that doesn't key by event opts out of the check.
  */
@@ -125,8 +125,6 @@ function applyStructured(output: HookOutput, parsed: Record<string, unknown>, ex
   if (cont !== undefined) output.continue = cont
   const stopReason = str(parsed, 'stopReason')
   if (stopReason !== undefined) output.stopReason = stopReason
-  const suppress = bool(parsed, 'suppressOutput')
-  if (suppress !== undefined) output.suppressOutput = suppress
   const sysMsg = str(parsed, 'systemMessage')
   if (sysMsg !== undefined) output.systemMessage = sysMsg
 

packages/hooks/hook-protocol/src/events.ts

@@ -16,7 +16,7 @@
  */
 
 import type { Session } from '@deepseek-ai/dsh-session'
-import type { HookDialect } from './types.ts'
+import type { HookDialect, HookOutput } from './types.ts'
 
 /** What identifies a hook invocation across its invoked/result pair. */
 export interface HookInvocation {
@@ -37,16 +37,42 @@ export interface HookResultRecord {
   turn: number
   point: string
   handlerId: string
-  /** The dialect-neutral decision the bridge resolved (`deny`/`allow`/`block`/…). */
-  decision: string
-  /** The process exit code (absent when the hook could not run). */
-  exitCode?: number
-  /** A truncated stderr summary (the block-reason source on exit 2). */
-  stderrSummary?: string
-  /** Wall-clock duration of the run. */
+  /**
+   * The decoded outcome the run produced. {@link appendHookResult} derives the
+   * durable `decision`/`exitCode`/`stderrSummary` fields from it, so the shared
+   * event's semantics live here, in the lib that declares it, not per-bridge.
+   */
+  output: HookOutput
+  /**
+   * Character cap for the derived `stderrSummary`. The bound is the bridge's
+   * to own (its `stderrSummaryMaxChars` config) and is passed in explicitly —
+   * {@link DEFAULT_STDERR_SUMMARY_MAX_CHARS} is the reference default.
+   */
+  stderrSummaryMaxChars: number
+  /** Wall-clock duration of the run (from `runHook`) — durable audit timing. */
   durationMs: number
 }
 
+/**
+ * The reference default for {@link HookResultRecord.stderrSummaryMaxChars}
+ * (both bridges' config default). It lives here, once, next to the truncation
+ * rule it bounds, so the bridges cannot drift apart on the shared event's
+ * default cap.
+ */
+export const DEFAULT_STDERR_SUMMARY_MAX_CHARS = 500
+
+/**
+ * Truncate a hook's stderr for {@link HookResultRecord.stderrSummary}: trimmed,
+ * `undefined` when empty, cut at `maxChars` with an ellipsis when over. The
+ * bound is a parameter — like `runHook`'s `defaultTimeoutMs`, each bridge owns
+ * the config default and passes it in.
+ */
+export function summarizeStderr(stderr: string, maxChars: number): string | undefined {
+  const t = stderr.trim()
+  if (t.length === 0) return undefined
+  return t.length > maxChars ? t.slice(0, maxChars) + '…' : t
+}
+
 /** Append a `hook/invoked` provenance event to `session`. */
 export function appendHookInvoked(session: Session, invocation: HookInvocation): void {
   session.append('hook/invoked', {
@@ -59,26 +85,23 @@ export function appendHookInvoked(session: Session, invocation: HookInvocation):
 }
 
 /**
- * Truncate a hook's stderr for {@link HookResultRecord.stderrSummary}: trimmed,
- * `undefined` when empty, cut at `maxChars` with an ellipsis when over. The
- * bound is a parameter — like `runHook`'s `defaultTimeoutMs`, each bridge owns
- * the config default and passes it in.
+ * Append a `hook/result` outcome event to `session` (pairs with a prior
+ * `hook/invoked`). Owns the durable event's semantics: `decision` is the hook's
+ * parsed decision, else `'stop'` when it asked to halt (`continue: false`),
+ * else `'pass'`; `stderrSummary` is the trimmed stderr truncated to
+ * `record.stderrSummaryMaxChars` characters (omitted when empty); `exitCode`
+ * is omitted when the hook never ran.
  */
-export function summarizeStderr(stderr: string, maxChars: number): string | undefined {
-  const t = stderr.trim()
-  if (t.length === 0) return undefined
-  return t.length > maxChars ? t.slice(0, maxChars) + '…' : t
-}
-
-/** Append a `hook/result` outcome event to `session` (pairs with a prior `hook/invoked`). */
 export function appendHookResult(session: Session, record: HookResultRecord): void {
+  const { output } = record
+  const stderrSummary = summarizeStderr(output.stderr, record.stderrSummaryMaxChars)
   session.append('hook/result', {
     turn: record.turn,
     point: record.point,
     handlerId: record.handlerId,
-    decision: record.decision,
-    ...record.exitCode !== undefined ? { exitCode: record.exitCode } : {},
-    ...record.stderrSummary !== undefined ? { stderrSummary: record.stderrSummary } : {},
+    decision: output.decision ?? (output.continue === false ? 'stop' : 'pass'),
+    ...output.exitCode !== undefined ? { exitCode: output.exitCode } : {},
+    ...stderrSummary !== undefined ? { stderrSummary } : {},
     durationMs: record.durationMs,
   })
 }

packages/hooks/hook-protocol/src/index.ts

@@ -12,7 +12,9 @@
  * - {@link mergeHookOutputs} — fold multiple matched hooks into one
  *   most-restrictive {@link MergedHookOutcome} (deny > ask > allow).
  * - {@link appendHookInvoked} / {@link appendHookResult} — the log-only `hook/*`
- *   session-event helpers (declaration-merged into `SessionEventMap`).
+ *   session-event helpers (declaration-merged into `SessionEventMap`);
+ *   `appendHookResult` derives the durable `decision`/`stderrSummary` from the
+ *   {@link HookOutput} so the shared event's semantics live in one place.
  *
  * Each bridge owns what genuinely DIFFERS: building the per-event stdin payload
  * (CC vs Codex field sets), the dialect's env/substitution, and mapping the
@@ -29,10 +31,10 @@ export type {
   MatcherMode,
 } from './types.ts'
 export { matchesMatcher } from './matcher.ts'
-export { BLOCKING_EXIT_CODE, parseHookOutput } from './codec.ts'
-export { runHook } from './runner.ts'
+export { parseHookOutput } from './codec.ts'
+export { DEFAULT_HOOK_TIMEOUT_MS, runHook } from './runner.ts'
 export type { RunHookOptions, RunHookResult } from './runner.ts'
 export { mergeHookOutputs } from './merge.ts'
 export type { MergedDecision, MergedHookOutcome } from './merge.ts'
-export { appendHookInvoked, appendHookResult, summarizeStderr } from './events.ts'
+export { appendHookInvoked, appendHookResult, DEFAULT_STDERR_SUMMARY_MAX_CHARS, summarizeStderr } from './events.ts'
 export type { HookInvocation, HookResultRecord } from './events.ts'

packages/hooks/hook-protocol/src/runner.ts

@@ -17,6 +17,15 @@ import type { BashExecutor } from '@deepseek-ai/dsh-bash'
 import { parseHookOutput } from './codec.ts'
 import type { CommandHook, HookOutput } from './types.ts'
 
+/**
+ * The reference default per-hook timeout, in ms (10 minutes) — the value both
+ * Claude Code and Codex apply to a hook whose config sets no `timeout`. It
+ * lives here, once, as the protocol's default; the bridges' `defaultTimeoutMs`
+ * config defaults to it, and a per-hook {@link CommandHook.timeoutSec} is the
+ * override surface.
+ */
+export const DEFAULT_HOOK_TIMEOUT_MS = 600_000
+
 /** Everything a single hook invocation needs beyond its command line. */
 export interface RunHookOptions {
   /** The JSON payload object written to the hook's stdin (the bridge builds it). */
@@ -27,10 +36,14 @@ export interface RunHookOptions {
   cwd?: string
   /** Abort signal — cancels the hook run when fired (the parent step aborts). */
   signal?: AbortSignal
-  /** Default timeout (ms) when the hook config sets none. */
-  defaultTimeoutMs: number
   /** Whether to append a trailing newline to the stdin payload (CC yes, Codex no). */
   trailingNewline: boolean
+  /**
+   * Timeout applied when the hook's config sets no `timeout` of its own. The
+   * bridge owns the default (its `defaultTimeoutMs` config, reference default
+   * {@link DEFAULT_HOOK_TIMEOUT_MS}) and passes it in explicitly.
+   */
+  defaultTimeoutMs: number
   /**
    * The event this hook is firing for (e.g. `'PreToolUse'`). When set, a
    * structured `hookSpecificOutput` block whose `hookEventName` names a DIFFERENT
@@ -43,18 +56,20 @@ export interface RunHookOptions {
 /** The {@link HookOutput} plus the wall-clock duration of the run (for `hook/result`). */
 export interface RunHookResult {
   output: HookOutput
+  /** Wall-clock duration of the run, from `now` — durable on the `hook/result` event. */
   durationMs: number
 }
 
 /**
  * Run `hook` via `bash` with `options.payload` serialized to its stdin, then
- * decode the result. `now` is injected (a monotonic-ms source) so the duration
- * is testable without a real clock. The hook's configured `timeoutSec` (wire
- * unit: seconds) overrides `defaultTimeoutMs`. The command runs with the
- * dialect's `env` merged after the executor's credential scrub (the trusted-
- * plugin path). NEVER throws: an infrastructure failure (the executor rejecting)
- * is surfaced as a {@link HookOutput} with `exitCode: undefined`, so the caller's
- * merge logic treats it as a non-blocking error rather than crashing the turn.
+ * decode the result into a {@link HookOutput}. The hook's configured
+ * `timeoutSec` (wire unit: seconds) overrides `options.defaultTimeoutMs`.
+ * The command runs with the dialect's `env` merged after the executor's
+ * credential scrub (the trusted-plugin path). NEVER throws: an infrastructure
+ * failure (the executor rejecting) is surfaced as a {@link HookOutput} with
+ * `exitCode: undefined`, so the caller's merge logic treats it as a
+ * non-blocking error rather than crashing the turn. `now` is injected for
+ * testable durations.
  */
 export async function runHook(
   bash: BashExecutor,

packages/hooks/hook-protocol/src/types.ts

@@ -18,7 +18,7 @@ declare module '@deepseek-ai/dsh-session' {
     /**
      * A hook command was invoked at a hook point — log-only provenance (like
      * `compact/*`; NOT a {@link SurfaceEventType}, carries no `surfaceOp`).
-     * `dialect` is the bridge that ran it (`claude`/`codex`/`native`), `point`
+     * `dialect` is the bridge that ran it (`claude`/`codex`), `point`
      * the hook point (`PreToolUse`, `Stop`, …), `matcher` the matcher-group
      * pattern that selected it (absent for match-all), `handlerId` a stable id
      * for the command (so an invoked/result pair correlates). `turn` is the open
@@ -33,11 +33,14 @@ declare module '@deepseek-ai/dsh-session' {
     }
     /**
      * A hook command's outcome — log-only, paired with a prior `hook/invoked`
-     * (same `handlerId`). `decision` is the resolved dialect-neutral outcome the
-     * bridge mapped it to (`allow`/`deny`/`ask`/`block`/`continue`/`stop`/`pass`),
-     * `exitCode` the process exit (absent if it never ran), `stderrSummary` a
-     * truncated stderr (the block reason source on exit 2), `durationMs` the wall
-     * time. `turn` matches the `hook/invoked`.
+     * (same `handlerId`). `decision` is the dialect-neutral outcome derived by
+     * `appendHookResult` (which owns the rule): the hook's parsed decision
+     * (`approve`/`allow`/`block`/`deny`/`ask`), else `'stop'` when it asked to
+     * halt via `continue:false`, else `'pass'`. `exitCode` is the process exit
+     * (absent if it never ran), `stderrSummary` the trimmed stderr truncated to
+     * the bridge's configured cap (the block reason source on exit 2),
+     * `durationMs` the wall-clock runtime (audit timing; snapshot replay
+     * normalizes it). `turn` matches the `hook/invoked`.
      */
     'hook/result': {
       turn: number
@@ -51,8 +54,12 @@ declare module '@deepseek-ai/dsh-session' {
   }
 }
 
-/** Which protocol dialect a hook config / invocation belongs to. */
-export type HookDialect = 'claude' | 'codex' | 'native'
+/**
+ * The bridge that ran a hook — the CC bridge stamps `'claude'`, the Codex
+ * bridge `'codex'`. A native plugin on the interception seams is not a bridge
+ * and writes no `hook/*` provenance (see the interception-seams RFC).
+ */
+export type HookDialect = 'claude' | 'codex'
 
 /**
  * One configured command hook (the `{ type: 'command', command, timeout? }`
@@ -113,8 +120,6 @@ export interface HookOutput {
   continue?: boolean
   /** Human-readable reason shown when {@link continue} is `false`. */
   stopReason?: string
-  /** Hide the hook's stdout from the transcript (CC `suppressOutput`). */
-  suppressOutput?: boolean
   /**
    * The neutral blocking decision a hook expressed, folded from the two channels
    * the reference protocols keep DISTINCT: the legacy top-level `decision`

packages/hooks/hook-protocol/tests/codec.spec.ts

@@ -38,13 +38,12 @@ describe('parseHookOutput — exit code semantics', () => {
 })
 
 describe('parseHookOutput — structured stdout (exit 0 only)', () => {
-  it('parses top-level continue/stopReason/suppressOutput/systemMessage', () => {
+  it('parses top-level continue/stopReason/systemMessage', () => {
     const out = parseHookOutput(0, JSON.stringify({
-      continue: false, stopReason: 'budget exceeded', suppressOutput: true, systemMessage: 'heads up',
+      continue: false, stopReason: 'budget exceeded', systemMessage: 'heads up',
     }), '')
     expect(out.continue).toBe(false)
     expect(out.stopReason).toBe('budget exceeded')
-    expect(out.suppressOutput).toBe(true)
     expect(out.systemMessage).toBe('heads up')
   })
 

packages/hooks/hook-protocol/tests/events.spec.ts

@@ -1,6 +1,11 @@
 import { describe, expect, it } from 'vitest'
 import { Session, SessionId } from '@deepseek-ai/dsh-session'
-import { appendHookInvoked, appendHookResult, summarizeStderr } from '@deepseek-ai/dsh-hook-protocol'
+import { appendHookInvoked, appendHookResult, summarizeStderr, type HookOutput } from '@deepseek-ai/dsh-hook-protocol'
+
+/** A {@link HookOutput} with the required stream fields defaulted. */
+function output(over: Partial<HookOutput> = {}): HookOutput {
+  return { exitCode: 0, stderr: '', stdout: '', ...over }
+}
 
 describe('hook/* session events', () => {
   it('appendHookInvoked records a log-only hook/invoked (with matcher when present)', () => {
@@ -18,7 +23,7 @@ describe('hook/* session events', () => {
 
   it('omits matcher when absent (match-all hook)', () => {
     const session = new Session(SessionId('s'))
-    appendHookInvoked(session, { turn: 2, point: 'Stop', dialect: 'native', handlerId: 'h2' })
+    appendHookInvoked(session, { turn: 2, point: 'Stop', dialect: 'codex', handlerId: 'h2' })
 
     const ev = [...session.events].find(e => e.type === 'hook/invoked')
     if (ev?.type === 'hook/invoked') {
@@ -26,32 +31,72 @@ describe('hook/* session events', () => {
     }
   })
 
-  it('appendHookResult records the decided outcome, omitting absent optionals', () => {
+  it('appendHookResult derives decision/exitCode/stderrSummary from the output', () => {
     const session = new Session(SessionId('s'))
     appendHookResult(session, {
-      turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny',
-      exitCode: 2, stderrSummary: 'blocked', durationMs: 12,
+      turn: 1, point: 'PreToolUse', handlerId: 'h1',
+      stderrSummaryMaxChars: 500, durationMs: 5, output: output({ exitCode: 2, stderr: 'blocked', decision: 'deny' }),
     })
     const full = [...session.events].find(e => e.type === 'hook/result')
     if (full?.type === 'hook/result') {
-      expect(full.data).toMatchObject({ turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny', exitCode: 2, stderrSummary: 'blocked', durationMs: 12 })
+      expect(full.data).toEqual({ turn: 1, point: 'PreToolUse', handlerId: 'h1', decision: 'deny', exitCode: 2, stderrSummary: 'blocked', durationMs: 5 })
     }
 
     // A result with no exit code / no stderr (e.g. a hook that could not run) omits both keys.
     const session2 = new Session(SessionId('s2'))
-    appendHookResult(session2, { turn: 1, point: 'Stop', handlerId: 'h3', decision: 'allow', durationMs: 3 })
+    appendHookResult(session2, {
+      turn: 1, point: 'Stop', handlerId: 'h3',
+      stderrSummaryMaxChars: 500, durationMs: 5, output: output({ exitCode: undefined, decision: 'allow' }),
+    })
     const sparse = [...session2.events].find(e => e.type === 'hook/result')
     if (sparse?.type === 'hook/result') {
       expect('exitCode' in sparse.data).toBe(false)
       expect('stderrSummary' in sparse.data).toBe(false)
-      expect(sparse.data.durationMs).toBe(3)
+      expect(sparse.data.decision).toBe('allow')
+    }
+  })
+
+  it('the decision falls back to stop on continue:false, else pass', () => {
+    const session = new Session(SessionId('s'))
+    appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'halt', stderrSummaryMaxChars: 500, durationMs: 5, output: output({ continue: false }) })
+    appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'noop', stderrSummaryMaxChars: 500, durationMs: 5, output: output() })
+    // An explicit decision wins over the continue:false fallback.
+    appendHookResult(session, { turn: 1, point: 'Stop', handlerId: 'both', stderrSummaryMaxChars: 500, durationMs: 5, output: output({ continue: false, decision: 'block' }) })
+
+    const decisions = [...session.events]
+      .filter(e => e.type === 'hook/result')
+      .map(e => e.type === 'hook/result' ? [e.data.handlerId, e.data.decision] : [])
+    expect(decisions).toEqual([['halt', 'stop'], ['noop', 'pass'], ['both', 'block']])
+  })
+
+  it('stderrSummary is trimmed and truncated to 500 characters with an ellipsis', () => {
+    const session = new Session(SessionId('s'))
+    appendHookResult(session, {
+      turn: 1, point: 'PreToolUse', handlerId: 'long',
+      stderrSummaryMaxChars: 500, durationMs: 5, output: output({ exitCode: 2, stderr: `  ${'x'.repeat(600)}  ` }),
+    })
+    const ev = [...session.events].find(e => e.type === 'hook/result')
+    if (ev?.type === 'hook/result') {
+      expect(ev.data.stderrSummary).toBe('x'.repeat(500) + '…')
+    }
+  })
+
+  it('a 500-character stderr is kept verbatim (the cap is exclusive)', () => {
+    const session = new Session(SessionId('s'))
+    appendHookResult(session, {
+      turn: 1, point: 'PreToolUse', handlerId: 'edge',
+      stderrSummaryMaxChars: 500, durationMs: 5, output: output({ exitCode: 2, stderr: 'y'.repeat(500) }),
+    })
+    const ev = [...session.events].find(e => e.type === 'hook/result')
+    if (ev?.type === 'hook/result') {
+      expect(ev.data.stderrSummary).toBe('y'.repeat(500))
     }
   })
 
   it('an invoked/result pair correlates by handlerId', () => {
     const session = new Session(SessionId('s'))
     appendHookInvoked(session, { turn: 1, point: 'PreToolUse', dialect: 'claude', handlerId: 'pair-1' })
-    appendHookResult(session, { turn: 1, point: 'PreToolUse', handlerId: 'pair-1', decision: 'allow', exitCode: 0, durationMs: 7 })
+    appendHookResult(session, { turn: 1, point: 'PreToolUse', handlerId: 'pair-1', stderrSummaryMaxChars: 500, durationMs: 5, output: output({ decision: 'allow' }) })
 
     const invoked = [...session.events].find(e => e.type === 'hook/invoked')
     const result = [...session.events].find(e => e.type === 'hook/result')

packages/hooks/hook-protocol/tests/runner.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import type { BashExecRequest, BashExecSpec, BashExecutor, BashRunResult } from '@deepseek-ai/dsh-bash'
-import { runHook } from '@deepseek-ai/dsh-hook-protocol'
+import { DEFAULT_HOOK_TIMEOUT_MS, runHook } from '@deepseek-ai/dsh-hook-protocol'
 
 /**
  * A minimal stand-in for the bits of {@link BashExecutor} that {@link runHook}
@@ -89,6 +89,7 @@ describe('runHook — payload + env + stdin plumbing', () => {
     const { bash, specs } = recordingBash(async () => result())
     await runHook(bash, { command: 'h' }, { payload: {}, defaultTimeoutMs: 60000, trailingNewline: true }, clock())
     expect(specs[0]!.timeoutMs).toBe(60000)
+    expect(DEFAULT_HOOK_TIMEOUT_MS).toBe(600_000) // the CC/Codex reference default (10 minutes)
   })
 
   it('passes the abort signal through', async () => {