> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase29-session08-required-derived-field-closeout-gate/implementation_summary.md). # Implementation Summary **Session ID**: `phase29-session08-required-derived-field-closeout-gate` **Completed**: 2026-06-20 **Duration**: 0.25 hours *** ## Overview Phase 29 Session 08 added a strict required-derived-field closeout gate for Trend Finder generated payloads. The implementation checks raw generated data before schema defaults can hide omitted branches, blocks collector handoff and static Brief rendering when required derived fields are missing, and preserves legacy parsing defaults for older payloads. *** ## Deliverables ### Files Created | File | Purpose | Lines | | --------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ----- | | `scripts/extensions/trend-finder/required-derived-fields.ts` | Required field definitions, closeout issue collection, sanitized formatting, and closeout error construction. | 236 | | `scripts/extensions/trend-finder/__tests__/required-derived-fields.test.ts` | Unit coverage for complete payloads, missing or wrong-shaped branches, issue caps, and sanitization. | 145 | ### Files Modified | File | Changes | | ----------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | | `scripts/extensions/trend-finder/collector.ts` | Runs strict closeout before generated payload handoff, snapshot writes, static readiness logging, and `validateData()` success. | | `scripts/extensions/trend-finder/static-brief-export.ts` | Runs closeout before report projection and HTML rendering, maps blocking errors, and prevents duplicate exports to the same output root. | | `scripts/extensions/trend-finder/static-brief-qa.ts` | Adds blocking QA issue mapping for required-derived-field closeout failures. | | `src/extensions/trend-finder/schema.ts` | Exports typed required topic/report field metadata while preserving legacy schema defaults. | | `src/extensions/trend-finder/fixtures.ts` | Adds complete, missing-field, wrong-shaped, and empty-default closeout fixture builders. | | `scripts/extensions/trend-finder/__tests__/collector.test.ts` | Covers generated payload rejection with sanitized closeout reasons. | | `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts` | Covers static export blocking before rendering or output promotion and complete-payload success. | | `src/extensions/trend-finder/__tests__/view-model.test.ts` | Covers legacy payload parsing through defaults without invoking strict closeout. | | `tests/e2e/trend-finder-static-brief.spec.ts` | Strengthens static Brief regression assertions for complete derived-field projection. | | `docs/extensions/trend-finder-pipeline.md` | Documents strict generated-payload closeout, static export blocking, and the distinction from legacy schema defaults. | | `docs/extensions/trend-finder-ui-surfaces.md` | Documents that live and static surfaces require generated derived fields before rendering. | *** ## Technical Decisions 1. **Raw object closeout before schema defaults**: The gate checks generated payload presence and shape before `TrendFinderDataSchema` fills defaults, so newly generated omissions cannot be masked. 2. **Defaults-aware required field list**: The gate only requires fields already backed by shipped deterministic defaults: `attentionPattern`, `receptionSignal`, `corroboration`, `evidenceRationales`, and `runNarratives`. 3. **Shared sanitized issue formatter**: Collector, static export, QA mapping, and tests reuse one helper so closeout diagnostics stay bounded to safe fields. 4. **Fail before write or render**: Collector closeout runs before snapshots and browser handoff, and static Brief closeout runs before projection, HTML rendering, QA, or output promotion. *** ## Test Results | Metric | Value | | -------- | ------------- | | Tests | 3790 | | Passed | 3790 | | Coverage | Not collected | Validation commands passed: * `bun run test` * `bun run typecheck` * `bun run typecheck:scripts` * `bun run lint` * `bun run test:e2e -- tests/e2e/trend-finder-static-brief.spec.ts` * `bun run scripts/extensions/trend-finder/measure-payload-size.ts --json` * `bun run runtime:check-private` * `git diff --check` * `bunx prettier --check` on active session deliverables *** ## Lessons Learned 1. Closeout gates must inspect raw generated payloads; running only after Zod parsing would hide exactly the omissions this session needs to catch. 2. Empty fallback shapes need explicit treatment. `evidenceRationales: {}` and `runNarratives: []` are valid present defaults, while missing or wrong-shaped branches are closeout failures. 3. Static export needs the same gate as live collection because polished HTML can otherwise make stale or malformed generated data look trustworthy. *** ## Future Considerations Items for future sessions: 1. Reuse the closeout and sanitized issue style for Session 09 source-death baseline alarms if any safe operator-facing issue output is needed. 2. Keep future derived fields out of the required closeout list until they have schema defaults and deterministic fallback behavior. 3. Continue running payload-size and private-runtime checks as later Phase 29 sessions add Brief richness and operator surfaces. *** ## Session Statistics * **Tasks**: 20 completed * **Files Created**: 2 * **Files Modified**: 11 * **Tests Added**: 7 focused test cases plus strengthened e2e assertions * **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. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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