> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase01-session02-hook-runtime-safety/implementation-notes.md). # Implementation Notes **Session ID**: `phase01-session02-hook-runtime-safety` **Package**: Cross-cutting (`apps/hooks`, `apps/cli`) **Started**: 2026-05-29 03:22 **Last Updated**: 2026-05-29 05:12 *** ## Session Progress | Metric | Value | | ------------------- | ------- | | Tasks Completed | 22 / 22 | | Estimated Remaining | 0 hours | | Blockers | 0 | *** ## Task Log ### 2026-05-29 - Session Start **Environment verified**: * [x] Prerequisites confirmed * [x] Tools available * [x] Directory structure ready **Resolved scope**: * Cross-cutting session across `apps/hooks` and `apps/cli`. * Root `vitest.config.ts` and `docs/api/event-api-hook-contracts.md` are in scope because they are explicit task targets. *** ### Task T001 - Verify retained hook-ingest assumptions **Started**: 2026-05-29 03:22 **Completed**: 2026-05-29 03:23 **Duration**: 1 minute **Notes**: * Compared the Session 01 contract mapping with the installed hook map and current handlers. * Recorded the assumptions Session 02 keeps stable: installed trigger set, `eventName` plus `type` dispatch, optional local services, bounded diagnostics, and local-only spool fallback. **Files Changed**: * `docs/api/event-api-hook-contracts.md` - Added retained runtime assumptions for Session 02. **BQC Fixes**: * Trust boundary enforcement: Documented that handlers keep server/listener availability optional and diagnostics cannot store raw payloads or secrets. *** ### Task T002 - Create hook runtime process-test harness **Started**: 2026-05-29 03:23 **Completed**: 2026-05-29 03:25 **Duration**: 2 minutes **Notes**: * Added a process-test harness with temporary `HOME` and `FACTIONOS_HOME` directories. * Added controlled stdin payloads, stdout/stderr capture, unavailable-server defaults, listener disabling, timeout cleanup, and JSON-line log parsing helpers. **Files Changed**: * `apps/hooks/tests/hookRuntime.test.js` - New isolated hook process test harness. **BQC Fixes**: * Resource cleanup: Temporary homes are removed after each test and spawned hook processes have explicit timeouts. *** ### Task T003 - Add CLI JavaScript tests to Vitest **Started**: 2026-05-29 03:25 **Completed**: 2026-05-29 03:26 **Duration**: 1 minute **Notes**: * Added the CLI JavaScript test glob to the existing Node Vitest project. **Files Changed**: * `vitest.config.ts` - Includes `apps/cli/tests/**/*.test.js` in Node tests. **Out-of-Scope Files**: * `vitest.config.ts` - Root test config is outside `apps/hooks` and `apps/cli`, but it is explicitly targeted by T003. *** ### Task T004 - Add atomic hook write helpers **Started**: 2026-05-29 03:26 **Completed**: 2026-05-29 03:34 **Duration**: 8 minutes **Notes**: * Added temp-file-plus-rename text and JSON writes with cleanup on failure. * Added shared state directory setup and quiet file removal helpers. **Files Changed**: * `apps/hooks/src/_lib.js` - Added atomic local write primitives. **BQC Fixes**: * Failure path completeness: Write failures clean up temp files and propagate to callers that can handle them. *** ### Task T005 - Add shared session-state helpers **Started**: 2026-05-29 03:34 **Completed**: 2026-05-29 03:37 **Duration**: 3 minutes **Notes**: * Added safe state filename generation, session id path helpers, listener PID path helpers, malformed session fallback, and stale PID detection. * Added a short-lived local lock helper for duplicate listener start prevention. **Files Changed**: * `apps/hooks/src/_lib.js` - Added session id, listener PID, and state filename helpers. **BQC Fixes**: * State freshness on re-entry: Malformed or stale state falls back cleanly instead of being trusted. *** ### Task T006 - Add unavailable-server fallback helpers **Started**: 2026-05-29 03:37 **Completed**: 2026-05-29 03:42 **Duration**: 5 minutes **Notes**: * Added bounded POST failure handling that writes sanitized spool entries when delivery fails. * Added diagnostic log redaction for sensitive keys and payload-size/status logging without raw payload capture. * Verified the helper module imports successfully with Node. **Files Changed**: * `apps/hooks/src/_lib.js` - Added fallback posting, spool pruning, payload sanitization, and redacted diagnostics. **BQC Fixes**: * External dependency resilience: Server POST failures are bounded by timeout and produce a local fallback path. * Error information boundaries: Diagnostics record sizes and statuses instead of raw prompts, commands, tokens, or file contents. *** ### Task T007 - Harden listener runtime **Started**: 2026-05-29 03:42 **Completed**: 2026-05-29 03:50 **Duration**: 8 minutes **Notes**: * Refactored the listener so helper functions can be imported by tests without starting the process. * Added atomic PID writes, reconnect timer cleanup, malformed frame logging without raw frames, sorted bounded spool draining, malformed spool deletion, and shutdown cleanup for timers, sockets, and PID files. * Verified the module imports successfully with Node. **Files Changed**: * `apps/hooks/src/ws-listener.js` - Hardened listener lifecycle and exposed testable helper seams. **BQC Fixes**: * Resource cleanup: Shutdown clears heartbeat, reconnect, and spool timers and removes PID state. * State freshness on re-entry: Malformed spool entries are deleted and closed sockets preserve valid pending entries. * Failure path completeness: Malformed WebSocket frames are logged as bounded metadata and ignored. *** ### Task T008 - Create CLI local file helpers **Started**: 2026-05-29 03:50 **Completed**: 2026-05-29 03:54 **Duration**: 4 minutes **Notes**: * Added fixture-friendly FactionOS and Claude home resolution. * Added atomic text/JSON writes, safe JSON reads, listener PID inspection, spool inspection, and PID liveness checks for CLI commands and tests. * Verified the helper module imports successfully with Node. **Files Changed**: * `apps/cli/src/lib/localFiles.js` - New CLI local file safety helper module. **BQC Fixes**: * State freshness on re-entry: Diagnostics can now inspect malformed local state without trusting it. * Failure path completeness: JSON reads return explicit result objects for malformed or missing files. *** ### Task T009 - Refactor hero spawn runtime **Started**: 2026-05-29 03:54 **Completed**: 2026-05-29 04:00 **Duration**: 6 minutes **Notes**: * Replaced direct session and PID writes with shared atomic helpers. * Added a short-lived listener lock and stale PID handling to avoid duplicate listener starts. * Added listener-disable support for process tests and bounded fallback posting for SessionStart. * Verified the script parses with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-hero-spawn.js` - Uses shared state, listener, and fallback helpers. **BQC Fixes**: * Duplicate action prevention: Listener startup is protected by a lock and stale PID checks. * Failure path completeness: Session state and listener spawn failures log bounded diagnostics and still exit successfully. *** ### Task T010 - Refactor prompt submit handler **Started**: 2026-05-29 04:00 **Completed**: 2026-05-29 04:03 **Duration**: 3 minutes **Notes**: * Replaced duplicated session-id file parsing with shared session resolution. * Added bounded fallback posting and a same-process in-flight guard. * Kept prompt and mission-name truncation aligned with the ingest contract. * Verified the script parses with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-hero-active.js` - Uses shared session and fallback helpers. **BQC Fixes**: * Duplicate action prevention: Same-process post dispatch is guarded. * Error information boundaries: Diagnostics record prompt length, not prompt text. *** ### Task T011 - Refactor stop handler **Started**: 2026-05-29 04:03 **Completed**: 2026-05-29 04:05 **Duration**: 2 minutes **Notes**: * Replaced duplicated session-id file parsing with shared session resolution. * Added an explicit `unknown` session fallback and bounded summary forwarding. * Verified the script parses with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-hero-idle.js` - Uses shared session and fallback helpers. **BQC Fixes**: * State freshness on re-entry: Missing session state falls back to a stable value instead of failing. * Error information boundaries: Summary diagnostics record length only. *** ### Task T012 - Refactor bash and file handlers **Started**: 2026-05-29 04:05 **Completed**: 2026-05-29 04:10 **Duration**: 5 minutes **Notes**: * Replaced duplicated session-id file parsing with shared session resolution. * Narrowed tool input values before payload construction and added `inputStatus` markers for missing command/path cases. * Kept command and file previews bounded and routed POST failure through local fallback helpers. * Verified both scripts parse with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-bash-command.js` - Uses shared session and fallback helpers with command input narrowing. * `apps/hooks/src/factionos-file-access.js` - Uses shared session and fallback helpers with file input narrowing. **BQC Fixes**: * Trust boundary enforcement: Tool payload fields are type-checked before use. * Failure path completeness: Missing command/path cases produce explicit status metadata instead of silent malformed payloads. *** ### Task T013 - Refactor input and permission handlers **Started**: 2026-05-29 04:10 **Completed**: 2026-05-29 04:16 **Duration**: 6 minutes **Notes**: * Replaced duplicated session-id file parsing with shared session resolution. * Narrowed question, option, response, and permission tool input fields before use. * Added explicit awaiting state markers for re-entry and cleared state. * Avoided serializing arbitrary permission tool input into diagnostics or details. * Verified all three scripts parse with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-awaiting-input.js` - Uses shared session and fallback helpers with option narrowing. * `apps/hooks/src/factionos-input-received.js` - Uses shared session and fallback helpers with response narrowing. * `apps/hooks/src/factionos-permission-request.js` - Uses shared session and fallback helpers with bounded permission details. **BQC Fixes**: * State freshness on re-entry: Awaiting and cleared state markers make repeated input lifecycles explicit. * Trust boundary enforcement: Tool input values are narrowed before use. * Error information boundaries: Permission details no longer serialize arbitrary raw tool input. *** ### Task T014 - Refactor subagent and git guard handlers **Started**: 2026-05-29 04:16 **Completed**: 2026-05-29 04:20 **Duration**: 4 minutes **Notes**: * Replaced duplicated session-id file parsing with shared session resolution. * Narrowed subagent tool input values before building bounded opaque payloads. * Routed git guard warning POSTs through fallback helpers while preserving stderr only for restricted-mode denial. * Verified all three scripts parse with `node --check`. **Files Changed**: * `apps/hooks/src/factionos-subagent-spawn.js` - Uses shared session and fallback helpers. * `apps/hooks/src/factionos-subagent-complete.js` - Uses shared session and fallback helpers. * `apps/hooks/src/factionos-git-guard.js` - Uses shared session and fallback helpers while preserving restricted denial behavior. **BQC Fixes**: * Trust boundary enforcement: Subagent and git command inputs are narrowed before use. * Error information boundaries: Observer-mode git guard remains silent; stderr is reserved for intentional restricted denial. *** ### Task T015 - Wire CLI init through local file helpers **Started**: 2026-05-29 04:20 **Completed**: 2026-05-29 04:27 **Duration**: 7 minutes **Notes**: * Replaced direct settings writes with atomic JSON/text helper writes. * Added safe malformed FactionOS settings and Claude settings fallback while preserving a raw backup before overwriting Claude settings. * Converted installer output to ASCII-only text. * Verified the command module parses with `node --check`. **Files Changed**: * `apps/cli/src/commands/init.js` - Uses shared local file helpers and malformed settings fallback. **BQC Fixes**: * State freshness on re-entry: Malformed existing settings no longer crash init. * Failure path completeness: User-owned settings are backed up before a malformed settings fallback overwrite. *** ### Task T016 - Wire CLI doctor and status diagnostics **Started**: 2026-05-29 04:27 **Completed**: 2026-05-29 04:34 **Duration**: 7 minutes **Notes**: * Replaced direct JSON reads in diagnostics with safe result-based reads. * Added listener PID and spool posture reporting with counts, status, and byte totals only. * Made server probes auth-aware and explicit about unavailable, timeout, invalid URL, and invalid JSON cases. * Converted diagnostics output to ASCII-only text. * Verified both command modules parse with `node --check`. **Files Changed**: * `apps/cli/src/commands/doctor.js` - Uses shared diagnostics helpers and explicit probe result handling. * `apps/cli/src/commands/status.js` - Uses shared diagnostics helpers and explicit unavailable-server handling. **BQC Fixes**: * Failure path completeness: Missing, malformed, or unavailable local/server state is reported explicitly. * Error information boundaries: Listener and spool diagnostics expose counts and statuses only, not payload contents. *** ### Task T017 - Update hook and CLI READMEs **Started**: 2026-05-29 04:34 **Completed**: 2026-05-29 04:39 **Duration**: 5 minutes **Notes**: * Documented hook silence, bounded POST timeout, unavailable-server spool fallback, diagnostics privacy, missing-session fallback, listener limits, and test-only listener disabling. * Documented CLI atomic local writes, malformed settings fallback, diagnostic scope, auth-aware health probes, listener posture, and spool posture reporting. **Files Changed**: * `apps/hooks/README_hooks.md` - Updated hook runtime safety and listener behavior docs. * `apps/cli/README_cli.md` - Updated CLI local-state safety and diagnostics docs. **BQC Fixes**: * Contract alignment: READMEs now match the implemented fallback and diagnostics behavior. *** ### Task T018 - Write hook runtime tests **Started**: 2026-05-29 04:39 **Completed**: 2026-05-29 04:46 **Duration**: 7 minutes **Notes**: * Added process tests for silent stdout/stderr, exit 0 behavior, unavailable-server spool fallback, diagnostic log redaction, session state resolution, and restricted git guard denial. * Ran `npx vitest run apps/hooks/tests/hookRuntime.test.js --project node`. **Files Changed**: * `apps/hooks/tests/hookRuntime.test.js` - Added hook runtime behavior tests. **BQC Fixes**: * Resource cleanup: Test child processes have timeouts and temporary homes are removed after each test. * Failure path completeness: POST failure paths are asserted through diagnostics and spool fallback. *** ### Task T019 - Write listener lifecycle tests **Started**: 2026-05-29 04:46 **Completed**: 2026-05-29 04:54 **Duration**: 8 minutes **Notes**: * Added listener tests for malformed frame parsing, bounded spool drain, malformed spool deletion, closed-socket preservation, startup PID state, shutdown PID cleanup, and stale PID replacement through hero spawn. * Initial test run caught an unavailable-server lifecycle bug: reconnect and spool timers were unref'ed, allowing the listener to exit early. Fixed by keeping those timers ref'ed. * Ran `npx vitest run apps/hooks/tests/listenerRuntime.test.js --project node`. **Files Changed**: * `apps/hooks/tests/listenerRuntime.test.js` - New listener runtime behavior tests. * `apps/hooks/src/ws-listener.js` - Kept reconnect and spool timers ref'ed so the listener stays alive while retrying. **BQC Fixes**: * Resource cleanup: Listener child processes are explicitly terminated in tests and PID cleanup is asserted. * External dependency resilience: Listener remains alive and reconnects when the server is unavailable. * State freshness on re-entry: Stale PID files are replaced by a fresh listener PID. *** ### Task T020 - Write CLI runtime tests **Started**: 2026-05-29 04:54 **Completed**: 2026-05-29 05:01 **Duration**: 7 minutes **Notes**: * Added CLI tests for atomic settings writes, existing hook preservation, malformed Claude settings fallback, backup preservation, doctor diagnostics, status diagnostics, listener reporting, and spool posture. * Tests use temporary homes and an in-process fake HTTP server. * Ran `npx vitest run apps/cli/tests/cliRuntime.test.js --project node`. **Files Changed**: * `apps/cli/tests/cliRuntime.test.js` - New CLI runtime fixture tests. **BQC Fixes**: * Resource cleanup: Fake servers are closed and temporary homes are removed after each test. * Error information boundaries: CLI diagnostics are asserted not to print spool payload contents. *** ### Task T021 - Run focused tests and workspace checks **Started**: 2026-05-29 05:01 **Completed**: 2026-05-29 05:07 **Duration**: 6 minutes **Notes**: * Ran focused hook and CLI runtime tests. * Ran Biome formatting on touched code/test files, then linted the touched code/test surface. * Ran workspace typecheck for packages with typecheck scripts. **Files Changed**: * `package.json` - No file changes; workspace scripts were used for verification. * Touched source and test files were formatted by Biome. **Verification**: * `npx vitest run apps/hooks/tests/hookPayloads.test.js apps/hooks/tests/hookRuntime.test.js apps/hooks/tests/listenerRuntime.test.js apps/cli/tests/cliRuntime.test.js --project node` - passed, 17 tests. * `npx biome lint ...` on touched code/test files - passed. * `npm run typecheck --workspaces --if-present` - passed. *** ### Task T022 - Validate encoding, LF, and unavailable-server behavior **Started**: 2026-05-29 05:07 **Completed**: 2026-05-29 05:12 **Duration**: 5 minutes **Notes**: * Checked touched text files for ASCII-only content and CRLF line endings. * Manually ran `apps/hooks/src/factionos-hero-active.js` against an unavailable loopback server with temporary local state. * Recorded the implementation-time validation gate. **Files Changed**: * `.spec_system/specs/phase01-session02-hook-runtime-safety/validation.md` - Added implementation gate results for T022. * `.spec_system/specs/phase01-session02-hook-runtime-safety/tasks.md` - Marked all tasks and completion checklist complete. **Verification**: * ASCII check on touched text files - passed. * CRLF check on touched text files - passed. * Manual unavailable-server hook check - exit 0, stdout 0 bytes, stderr 0 bytes, 1 spool file, 2 hook log lines. **Out-of-Scope Files**: * `.spec_system/specs/phase01-session02-hook-runtime-safety/validation.md` - Session artifact target for T022, outside `apps/hooks` and `apps/cli`. *** --- # Agent Instructions This documentation is published with GitBook. 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