> 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_summary.md). # Implementation Summary **Session ID**: `phase01-session02-hook-runtime-safety` **Package**: Cross-cutting (`apps/hooks`, `apps/cli`) **Completed**: 2026-05-29 **Duration**: \~2 hours *** ## Overview Hardened the hook runtime and CLI local-state paths so unsupported or unreachable local services fail silently, diagnostics remain bounded, and listener lifecycle state is managed safely. The session also added focused runtime tests, updated the hook contract notes, and documented the runtime safety guarantees for hooks and CLI commands. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- | ----- | | `apps/hooks/tests/hookRuntime.test.js` | Process-level hook runtime tests for silence, fallback, and diagnostics | \~180 | | `apps/hooks/tests/listenerRuntime.test.js` | Listener lifecycle tests for startup, reconnect, spool, and shutdown behavior | \~160 | | `apps/cli/src/lib/localFiles.js` | Atomic local-file helpers for CLI state and settings handling | \~120 | | `apps/cli/tests/cliRuntime.test.js` | CLI runtime tests for init, settings preservation, and diagnostics | \~180 | | `.spec_system/specs/phase01-session02-hook-runtime-safety/IMPLEMENTATION_SUMMARY.md` | Session closeout summary | \~120 | ### Files Modified | File | Changes | | ------------------------------------------------------------------------ | --------------------------------------------------------------------------- | | `.spec_system/state.json` | Marked the session complete and recorded completion history | | `.spec_system/PRD/phase_01/PRD_phase_01.md` | Advanced phase progress and session tracker status | | `.spec_system/specs/phase01-session02-hook-runtime-safety/spec.md` | Marked the session complete and checked off quality gates | | `.spec_system/specs/phase01-session02-hook-runtime-safety/validation.md` | Added the final PASS validation report | | `package.json` | Bumped project version from `0.1.24` to `0.1.25` | | `vitest.config.ts` | Added CLI runtime tests to the Node project include list | | `docs/api/event-api-hook-contracts.md` | Recorded retained hook-runtime assumptions for this session | | `apps/hooks/src/_lib.js` | Added atomic writes, fallback posting, redaction, and path helpers | | `apps/hooks/src/ws-listener.js` | Hardened listener startup, reconnect, spool, and shutdown behavior | | `apps/hooks/src/factionos-hero-spawn.js` | Switched to shared session/PID helpers and safer listener startup | | `apps/hooks/src/factionos-hero-active.js` | Switched to shared session resolution and fallback posting | | `apps/hooks/src/factionos-hero-idle.js` | Switched to shared session resolution and fallback posting | | `apps/hooks/src/factionos-bash-command.js` | Switched to shared session resolution and bounded fallback posting | | `apps/hooks/src/factionos-file-access.js` | Switched to shared session resolution and bounded fallback posting | | `apps/hooks/src/factionos-awaiting-input.js` | Switched to shared session resolution and bounded fallback behavior | | `apps/hooks/src/factionos-input-received.js` | Switched to shared session resolution and bounded fallback behavior | | `apps/hooks/src/factionos-permission-request.js` | Switched to shared session resolution and bounded fallback behavior | | `apps/hooks/src/factionos-subagent-spawn.js` | Switched to shared session resolution and opaque payload handling | | `apps/hooks/src/factionos-subagent-complete.js` | Switched to shared session resolution and opaque payload handling | | `apps/hooks/src/factionos-git-guard.js` | Preserved restricted-mode stderr behavior while keeping observer mode quiet | | `apps/hooks/README_hooks.md` | Documented diagnostics, latency, silence, and fallback behavior | | `apps/cli/src/commands/init.js` | Added atomic settings writes and malformed-settings fallback | | `apps/cli/src/commands/doctor.js` | Added bounded listener and spool diagnostics | | `apps/cli/src/commands/status.js` | Added consistent listener-state reporting | | `apps/cli/README_cli.md` | Documented CLI runtime diagnostics and local-state safety | *** ## Technical Decisions 1. **Atomic local writes for user-owned state**: temp-file-plus-rename was used for hook and CLI files that can be touched during normal operation. 2. **Bounded diagnostics instead of raw payload logging**: logs record status, sizes, and filenames rather than prompts, commands, or file contents. 3. **Listener resilience over hard dependency**: the runtime stays usable when the local server is unavailable and keeps spool fallback local. *** ## Test Results | Metric | Value | | -------- | ----- | | Tests | 17 | | Passed | 17 | | Coverage | N/A | *** ## Lessons Learned 1. Listener lifecycle work needs explicit cleanup paths for timers, sockets, and stale PID state. 2. Hook diagnostics stay safer when redaction happens before persistence, not after. *** ## Future Considerations Items for future sessions: 1. Extend the same runtime-safety patterns to the remaining Phase 01 CLI lifecycle session. 2. Keep the phase documentation aligned as more runtime contracts move from `EXAMPLES/` evidence into current source. *** ## Session Statistics * **Tasks**: 22 completed * **Files Created**: 5 * **Files Modified**: 24 * **Tests Added**: 3 * **Blockers**: 0 resolved --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. 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