> 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/phase18-session04-idle-lifecycle-engine-parity/implementation_summary.md). # Implementation Summary **Session ID**: `phase18-session04-idle-lifecycle-engine-parity` **Package**: `apps/server` **Completed**: `2026-06-10` **Duration**: `0.4 hours` *** ## Overview Implemented automatic idle suggestion generation for the Quest Board server runtime. Hero idle transitions now trigger bounded asynchronous generation, privacy-filtered context is assembled from session and mission activity, duplicate work is prevented with cooldown and in-flight guards, and all successful or fallback results flow through `SuggestionManager` and the canonical broadcast path. *** ## Deliverables ### Files Created | File | Purpose | Lines | | --------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- | ----- | | `apps/server/src/lib/idleSuggestionContext.ts` | Pure context builder for hero-idle sessions, recent messages, mission data, and modified-file extraction | \~220 | | `apps/server/src/lib/idleSuggestionLifecycle.ts` | Async lifecycle coordinator for idle triggers, cooldown, in-flight guard, timeout, manager storage, broadcasts, and cleanup | \~260 | | `apps/server/tests/idleSuggestionContext.test.ts` | Unit coverage for context building, privacy filtering, path extraction, and fallback labels | \~220 | | `apps/server/tests/idleSuggestionLifecycle.test.ts` | Unit coverage for trigger, cooldown, in-flight, timeout, fallback, manager writes, broadcasts, and destroy cleanup | \~320 | ### Files Modified | File | Changes | | ----------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | | `apps/server/src/llm/engines/idleSuggestionEngine.ts` | Added typed generation inputs, parsing for array and object response shapes, deterministic fallback candidates, and timeout-friendly call seams. | | `apps/server/src/routes/llm.ts` | Kept `POST /llm/idle-suggestion` aligned with the upgraded typed engine output and compatibility broadcast behavior. | | `apps/server/src/routes/event.ts` | Recorded bounded session activity and triggered idle generation after hero state transitions to `idle`. | | `apps/server/src/server.ts` | Wired the idle lifecycle coordinator into server startup and shutdown. | | `apps/server/tests/llm.test.ts` | Extended parser and fallback coverage for the upgraded idle engine. | | `apps/server/tests/routes.test.ts` | Updated event and route integration expectations for idle generation. | | `apps/server/README_server.md` | Documented the new idle lifecycle behavior and Quest Board flow. | | `.spec_system/state.json` | Marked the session complete and appended completion history. | | `.spec_system/PRD/phase_18/PRD_phase_18.md` | Advanced the phase tracker to Session 04 complete and updated progress. | | `.spec_system/PRD/PRD.md` | Updated the master PRD to reflect 4/11 phase completion. | | `apps/server/package.json` | Bumped the patch version from `0.1.41` to `0.1.42`. | *** ## Technical Decisions 1. **Coordinator boundary**: moved cooldown, in-flight tracking, timeout, and cleanup into one injectable lifecycle helper to keep event handling simple. 2. **Pure context building**: isolated context extraction from server startup so privacy and path filtering stay testable without booting the app. *** ## Test Results | Metric | Value | | -------- | ------------------------------------------ | | Tests | 2566 root Vitest + 54 focused server tests | | Passed | 2566 + 54 | | Coverage | Not collected in this validation run | *** ## Lessons Learned 1. Async idle generation needs explicit cleanup paths so shutdown does not leave timers or abort handles behind. 2. Deterministic fallback candidates are necessary to keep the Quest Board usable when provider transfer is unavailable or parsing fails. *** ## Future Considerations 1. Session 05 should add session summary generation and noise filtering. 2. Later Phase 18 sessions should keep the web cards and scan engines aligned with the canonical suggestion snapshot. *** ## Session Statistics * **Tasks**: 25 completed * **Files Created**: 4 * **Files Modified**: 7 * **Tests Added**: 2 * **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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