docs: rebalance prose cleanup and add trimming skill

packages/hooks/hook-protocol/README.md

@@ -19,7 +19,7 @@ Why a shared lib at all: Codex deliberately reimplements a *subset* of the Claud
 
 - **`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 `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?)`** decodes exit status and structured stdout. Exit 2 blocks with stderr; other failures are non-blocking. Event-specific output applies only when its discriminator matches the firing event, while top-level fields remain event-agnostic. The parser is total and leaves successful non-JSON output to the bridge.
+- **`parseHookOutput(exitCode, stdout, stderr, expectedEventName?)`** decodes exit status and structured stdout. Exit 2 blocks with stderr; other failures are non-blocking. A matching hook-specific permission decision overrides the legacy top-level decision; mismatched or missing event discriminators suppress only event-specific fields. Top-level fields remain event-agnostic, and successful non-JSON output is left to the bridge.
 - **`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.
 - **`createDetachedRuns()`** — quiescence tracking for the emit-shaped points, which run detached (no seam awaits them). The bridge tracks each run chain — the hook run PLUS its continuation — and registers `drain()` as its effect disposer: drain fires the tracker's abort `signal` (so a still-running hook process is killed via `runHook`, not awaited out to its timeout), then resolves once every tracked chain has settled. `fiber.dispose()` resolving therefore means no detached hook work is left to fire into a disposed context ([defensive patterns](../../../docs/defensive-patterns.md): dispose must reach quiescence).
 

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

@@ -1,6 +1,7 @@
 /**
- * Parse a finished hook command's process outcome (exit code + stdout + stderr) into the
- * dialect-neutral {@link HookOutput} both bridges map from.
+ * Decode hook process outcomes for both dialects. Exit 0 may carry structured
+ * JSON or plain stdout; exit 2 blocks with stderr as the reason; every other
+ * exit is a non-blocking error. Bridges decide which recognized fields apply.
  * @module @deepseek-ai/dsh-hook-protocol/codec
  */
 
@@ -44,11 +45,15 @@ function permissionDecisionOf(value: string | undefined): HookOutput['decision']
 }
 
 /**
- * Decode process output into the dialect-neutral hook outcome.
+ * Decode process output into a dialect-neutral hook outcome. This function is
+ * total: malformed JSON remains plain stdout. When `expectedEventName` is set,
+ * a missing or different `hookSpecificOutput.hookEventName` discards only its
+ * event-scoped fields; top-level fields and the claimed discriminator remain.
+ * Omitting the guard applies the block as-is.
  * @param exitCode - process exit, or `undefined` when spawn failed.
  * @param stdout - output parsed as structured JSON only on exit 0.
  * @param stderr - the captured stderr stream; becomes the blocking `reason` on exit 2.
- * @param expectedEventName - optional event guard for hook-specific output.
+ * @param expectedEventName - firing event used to guard hook-specific fields; omit to disable the guard.
  * @returns the dialect-neutral decoded outcome.
  */
 export function parseHookOutput(exitCode: number | undefined, stdout: string, stderr: string, expectedEventName?: string): HookOutput {
@@ -113,8 +118,7 @@ function applyStructured(output: HookOutput, parsed: Record<string, unknown>, ex
     // Always surface the discriminator (for the log/diagnostics), even on a
     // mismatch — the record should show what the malformed block claimed.
     if (eventName !== undefined) output.hookEventName = eventName
-    // The schemas key this block by event: when a caller passes the firing event
-    // (`expectedEventName`), the block's `hookEventName` must name it.
+    // A missing or mismatched discriminator cannot affect the firing event.
     if (expectedEventName !== undefined && eventName !== expectedEventName) {
       return
     }

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

@@ -1,5 +1,7 @@
 /**
- * Quiescence tracking for a bridge's DETACHED hook runs.
+ * Quiescence tracking for emit-shaped hook runs that no seam awaits. Bridges
+ * track the run plus its continuation, pass the tracker signal into execution,
+ * and drain on disposal so no process or late callback outlives the fiber.
  * @module @deepseek-ai/dsh-hook-protocol/detached
  */
 

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

@@ -1,8 +1,8 @@
 /**
- * Append helpers for the log-only `hook/*` session events — the durable record that a hook ran
- * and what it decided. Thin wrappers over `session.append` so a bridge does not hand-build the
- * payloads (and so the `turn`-enclosure + invoked/result pairing stay consistent across both
- * bridges).
+ * Append helpers for durable, log-only hook events. They carry no surface
+ * intent and must remain turn-enclosed and invoked/result paired. Mid-turn hook
+ * points satisfy that boundary; SessionStart records injected context instead
+ * and does not append `hook/*` outside a turn.
  * @module @deepseek-ai/dsh-hook-protocol/events
  */
 
@@ -83,8 +83,9 @@ export function appendHookInvoked(session: Session, invocation: HookInvocation):
 }
 
 /**
- * Append the durable result paired with `hook/invoked`, normalizing its decision,
- * bounded stderr summary, and optional exit code.
+ * Append the durable result paired with `hook/invoked`. The recorded decision
+ * is the parsed decision, then `stop` for `continue:false`, else `pass`; stderr
+ * is trimmed and capped, and an absent process exit stays omitted.
  * @param session - the session whose open turn records the event.
  * @param record - the outcome to record: the decoded output plus the summary cap and duration.
  */

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

@@ -1,8 +1,8 @@
 /**
- * `@deepseek-ai/dsh-hook-protocol` — the shared core of the Claude Code / Codex hook wire
- * protocol. not a cordis plugin: it registers nothing and injects nothing. It is a LIBRARY of
- * dialect-neutral primitives the two bridge plugins (`dsh-hooks-claude`, `dsh-hooks-codex`)
- * import to avoid re-implementing the identical halves of the protocol.
+ * Shared, non-plugin hook protocol library: matching, command execution and
+ * decoding, restrictive outcome merging, durable event helpers, and detached
+ * run quiescence. Claude Code and Codex bridges own their distinct payloads,
+ * environment rules, matcher mode, and typed seam mappings.
  * @module @deepseek-ai/dsh-hook-protocol
  */
 

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

@@ -1,6 +1,8 @@
 /**
- * The matcher primitive shared by both hook dialects: decide whether a matcher pattern selects
- * a given query (a tool name, a session source, …).
+ * Matcher shared by both hook dialects. Claude treats alphanumeric/underscore/
+ * pipe patterns as literal alternatives and other patterns as regex; Codex
+ * treats every non-empty pattern as an unanchored regex. Missing, empty, and
+ * `*` match all; invalid regexes silently match nothing.
  * @module @deepseek-ai/dsh-hook-protocol/matcher
  */
 
@@ -15,8 +17,9 @@ function isMatchAll(matcher: string | undefined): boolean {
 const CLAUDE_LITERAL = /^[A-Za-z0-9_|]+$/
 
 /**
- * Whether `matcher` selects `query` under the given dialect {@link MatcherMode}.
- *
+ * Whether `matcher` selects `query` under the given dialect. Claude literal
+ * patterns exact-match pipe-separated alternatives; all other patterns are
+ * unanchored regexes. Invalid regexes return `false` rather than throwing.
  * @param matcher - the configured pattern; absent/empty/`'*'` are the match-all sentinels.
  * @param query - the candidate value (a tool name, a session source, …).
  * @param mode - the dialect deciding literal-vs-regex interpretation of the pattern.

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

@@ -1,6 +1,8 @@
 /**
- * Merge the outcomes of MULTIPLE hooks that matched one hook point into a single
- * most-restrictive {@link MergedHookOutcome}.
+ * Merge matched hooks into one most-restrictive outcome. Permission precedence
+ * is `deny > ask > allow`; the first `continue:false` stop is sticky; reasons
+ * for the winning rank are joined; and context and system messages accumulate
+ * in hook order.
  * @module @deepseek-ai/dsh-hook-protocol/merge
  */
 
@@ -59,9 +61,7 @@ function decisionForRank(maxRank: number): MergedDecision {
  */
 export function mergeHookOutputs(outputs: HookOutput[]): MergedHookOutcome {
   let maxRank = 0
-  // Reasons collected per RANK, so the merged reason can be the one explaining the WINNING
-  // decision (a deny-winning outcome surfaces deny reasons; an ask-winning outcome surfaces ask
-  // reasons).
+  // Keep reasons per rank so only objections explaining the winning decision surface.
   const reasonsByRank = new Map<number, string[]>()
   let stop = false
   let stopReason: string | undefined

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

@@ -1,8 +1,8 @@
 /**
- * Run one configured command hook through the `ctx.bash` executor seam and parse its outcome
- * into a {@link HookOutput}. This is where the wire protocol's EXECUTION half lives: feed the
- * hook its JSON payload on stdin, hand it the dialect's env vars, honor its timeout, capture
- * stdout/stderr/exit, and decode.
+ * Execute command hooks through `ctx.bash`, using its credential scrub,
+ * process-group cancellation, and timeout machinery. The bridge supplies the
+ * trusted stdin payload and dialect environment, then this module decodes the
+ * captured outcome.
  * @module @deepseek-ai/dsh-hook-protocol/runner
  */
 
@@ -54,9 +54,10 @@ export interface RunHookResult {
 }
 
 /**
- * Run `hook` via `bash` with `options.payload` serialized to its stdin, then decode the result
- * into a {@link HookOutput}.
- *
+ * Run `hook` with serialized stdin and decode its outcome. A hook-specific
+ * timeout in seconds overrides the default; trusted environment entries merge
+ * after the executor scrub. Infrastructure rejection becomes an outcome with
+ * no exit code, so this function never throws or crashes the calling turn.
  * @param bash - the executor seam the command runs through.
  * @param hook - the configured command; its `timeoutSec` (wire unit: seconds) overrides the default timeout.
  * @param options - the invocation's payload, env, cwd, signal, stdin framing, and default timeout.

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

@@ -1,7 +1,7 @@
 /**
- * Dialect-neutral vocabulary for the Claude Code / Codex hook wire protocol, plus the log-only
- * `hook/*` session events. Types only — runtime helpers live in the sibling modules
- * (`matcher`, `codec`, `runner`, `merge`, `events`).
+ * Dialect-neutral vocabulary and log-only events shared by the Claude Code and
+ * Codex hook bridges. Payload construction, matching differences, environment,
+ * and seam-specific decision mapping remain owned by each bridge.
  * @module @deepseek-ai/dsh-hook-protocol/types
  */
 
@@ -23,7 +23,11 @@ declare module '@deepseek-ai/dsh-session' {
       matcher?: string
       handlerId: string
     }
-    /** Log-only hook outcome paired to `hook/invoked` by `handlerId`. */
+    /**
+     * Log-only outcome paired to `hook/invoked` by `handlerId`. Decision is the
+     * parsed permission result, `stop` for `continue:false`, or `pass`; exit code
+     * may be absent, stderr is bounded, and duration is wall-clock runtime.
+     */
     'hook/result': {
       turn: number
       point: string