> 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-session06-cross-topic-substrate-narratives/implementation_summary.md). # Implementation Summary **Session ID**: `phase29-session06-cross-topic-substrate-narratives` **Completed**: 2026-06-20 **Duration**: 0.5 hours *** ## Overview Phase 29 Session 06 added bounded cross-topic substrate narratives to Trend Finder. The implementation publishes additive `runNarratives` rows over existing topics and evidence, validates AI-authored rows against known topic/evidence IDs and public-copy boundaries, builds deterministic low-confidence fallback rows, and renders safe narrative summaries in live Trend Finder and static Brief surfaces. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------ | ----- | | `scripts/extensions/trend-finder/run-narratives.ts` | Run narrative contract, validation, deterministic fallback, warning codes, and merge policy. | 571 | | `scripts/extensions/trend-finder/__tests__/run-narratives.test.ts` | Unit coverage for valid references, invalid drops, fallback behavior, generic suppression, and bounded copy. | 208 | ### Files Modified | File | Changes | | ------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | | `scripts/lib/ai-runtime/trend-analyst.ts` | Added optional analyst `runNarratives` schema, prompt guidance, reference validation, and public-copy checks. | | `scripts/extensions/trend-finder/collector.ts` | Wired narrative generation after theme rollups with sanitized trace metadata. | | `src/extensions/trend-finder/schema.ts` | Added narrative constants, schema defaults, legacy parsing, and stale-row filtering. | | `src/extensions/trend-finder/view-model.ts` | Projected narrative rows with confidence/provenance tones, citation labels, and accessibility text. | | `src/extensions/trend-finder/views/trends-view.tsx` | Rendered compact narrative rows on the Trends surface. | | `src/extensions/trend-finder/views/brief-view.tsx` | Rendered narrative rows in the live Brief surface. | | `scripts/extensions/trend-finder/static-brief-export.ts` | Added bounded narrative rows to the static Brief model. | | `scripts/extensions/trend-finder/static-brief-renderer.ts` | Rendered escaped narrative rows and citation labels in static HTML. | | `scripts/extensions/trend-finder/static-brief-qa.ts` | Added narrative section coverage to static Brief QA. | | `scripts/extensions/trend-finder/measure-payload-size.ts` | Exposed `data.runNarratives` in payload-size reporting. | | `src/extensions/trend-finder/fixtures.ts` | Added AI-valid and fallback fixture narratives. | | `scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts` | Added analyst acceptance, unknown reference, unsupported-claim, and voice-guard coverage. | | `scripts/extensions/trend-finder/__tests__/collector.test.ts` | Added collector narrative attachment and fallback coverage. | | `src/extensions/trend-finder/__tests__/view-model.test.ts` | Added schema default, projection, citation, and stale-row coverage. | | `src/extensions/trend-finder/views/__tests__/brief-view.test.tsx` | Added live Brief narrative rendering coverage. | | `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts` | Added static export and privacy assertions for narratives. | | `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts` | Added escaped rendering, section, and empty-state assertions. | | `scripts/extensions/trend-finder/__tests__/static-brief-qa.test.ts` | Updated expected QA section counts for the new narrative section. | *** ## Technical Decisions 1. **Single additive field**: Published one report-level `runNarratives` field to avoid parallel naming and preserve legacy parsing through an empty-array default. 2. **Boundary-nearest validation**: Rejected AI rows before collector scoring, browser payloads, or static export when topic IDs, evidence IDs, or public copy were unsupported. 3. **Deterministic fallback first**: Built low-confidence fallback rows from existing theme groups and shared source/entity/keyword support, with no new source or media boundary. 4. **Sanitized observability**: Collector warnings and traces include codes, counts, IDs, provenance, and confidence labels only, not prompts, provider responses, or raw copy. *** ## Test Results | Metric | Value | | -------- | ------- | | Tests | 3763 | | Passed | 3763 | | Coverage | Not run | Validation commands passed: * `bun run test` * `bun run typecheck:scripts` * `bun run typecheck` * `bun run scripts/extensions/trend-finder/measure-payload-size.ts src/data/live-data.example.json --threshold-kb=1024 --json` * `git diff --check` * `bunx prettier --check src/extensions/trend-finder/schema.ts src/extensions/trend-finder/__tests__/view-model.test.ts` *** ## Lessons Learned 1. Valid cross-topic synthesis needs citation lookup across all brief topic rows, not only visible ranked cards, because hidden-gem topics can still be valid narrative citations. 2. Legacy or stale `runNarratives` rows should be filtered safely during parsing instead of forcing the entire report payload to fall back to empty data. 3. Static Brief privacy tests are the right place to prove escaped narrative rendering and private/raw leak exclusion together. *** ## Future Considerations Items for future sessions: 1. Keep Session 07 validation narration aligned with the same sanitized warning-code pattern. 2. Reuse the required-derived-field fallback and stale-row filtering behavior when Session 08 adds closeout gates. 3. Continue running payload-size checks as Phase 29 adds more derived fields and static Brief richness. *** ## Session Statistics * **Tasks**: 22 completed * **Files Created**: 2 * **Files Modified**: 18 * **Tests Added**: 157 focused tests across 8 focused suites * **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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