> 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-session15-pre-run-estimate/implementation_summary.md). # Implementation Summary **Session ID**: `phase29-session15-pre-run-estimate` **Completed**: 2026-06-21 **Duration**: 0.4 hours *** ## Overview Completed the Trend Finder pre-run estimate session. The shipped work adds an additive `preRunEstimate` contract that projects spend, cadence, source counts, and safe wall-clock planning before scheduler or manual Trend Finder runs start. The UI labels the values as estimates, preserves post-run actual-spend accounting, and keeps missing-cost states explicit instead of treating unknown spend as zero. *** ## Deliverables ### Files Created No standalone production files were created. The session added workflow artifacts under `.spec_system/specs/phase29-session15-pre-run-estimate/`. ### Files Modified | File | Changes | | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- | | `scripts/extensions/trend-finder/spend-accounting.ts` | Added bounded pre-run spend/cadence estimate helpers with unavailable, mixed, exact, and no-cost states. | | `scripts/lib/trend-finder-scheduler-status.ts` | Added script-side `preRunEstimate` types and projection from spend summary, reviewed cadence, source counts, and safe duration. | | `src/extensions/trend-finder/scheduler-status.ts` | Added browser schema defaults and types so legacy payloads parse with an unavailable estimate. | | `src/extensions/trend-finder/view-model.ts` | Added estimate labels, tones, duration formatting, and additive scheduler view-model projection. | | `src/extensions/trend-finder/run-control.ts` | Added optional run-control estimate presentation with loading, error, offline, and unavailable fallbacks. | | `src/extensions/trend-finder/components/scheduler-first-run-panel.tsx` | Rendered pre-run estimate metrics and fallback states before execution. | | `src/extensions/trend-finder/components/trend-run-control.tsx` | Rendered compact/full pre-run estimate UI and guarded duplicate run clicks while disabled, busy, or already running. | | `src/extensions/trend-finder/views/trends-view.tsx` | Threaded parsed scheduler estimate data into Trend Run Control. | | `src/extensions/trend-finder/fixtures.ts` | Added configured paid-source, public no-cost, and missing-cost estimate fixtures. | | `src/extensions/trend-finder/components/__tests__/scheduler-status.test.tsx` | Added schema, view-model, scheduler panel, and run-control coverage for estimate states. | | `scripts/lib/__tests__/trend-finder-scheduler-status.test.ts` | Added script-side projection coverage for paid-source, no-cost, missing-cost, cadence, and wall-clock states. | | `scripts/lib/__tests__/trend-finder-scheduler-status-bridge.test.ts` | Proved the token-gated bridge returns safe estimate payload data without private path or token leakage. | | `docs/extensions/trend-finder-pipeline.md` | Documented pre-run estimate semantics, planning-only scope, and privacy boundary. | | `docs/extensions/trend-finder-ui-surfaces.md` | Documented scheduler and run-control estimate placement and fallback behavior. | *** ## Technical Decisions 1. **Additive estimate contract**: `preRunEstimate` is added beside existing `recurringSpend` so existing post-run and recurring-spend consumers remain stable. 2. **Unknown is not zero**: Missing-cost cases render as unavailable or partial estimates; explicit `$0` appears only for reviewed no-paid-source cases. 3. **Planning transparency only**: UI copy describes the values as estimates and does not claim a hard cap because the runner does not enforce one. 4. **Browser-safe defaults**: Zod defaults keep older payloads valid and limit browser-visible estimate data to bounded labels, counts, money values, and sanitized duration facts. *** ## Test Results | Metric | Value | | -------- | ------------- | | Tests | 3861 | | Passed | 3861 | | Coverage | Not collected | Validation also passed `bun run typecheck:scripts`, `bun run typecheck`, `bun run lint`, focused Playwright route checks, Trend Finder payload-size validation at 14138 bytes against the 1048576-byte limit, `bun run runtime:check-private`, scoped Prettier, targeted privacy scan, ASCII/LF validation, security review, and behavioral quality checks. *** ## Lessons Learned 1. Pre-run cost transparency needs explicit unavailable and partial states; otherwise missing data can look like free execution. 2. Scheduler estimates are safest as a browser-safe projection over existing spend and latest-run facts, not a direct exposure of scheduler state. 3. Dense run-control additions need browser viewport checks because compact estimate metrics can push higher-priority trend content out of the first viewport. *** ## Future Considerations Items for future sessions: 1. Keep podcast Sessions 16-17 compliance-first and avoid expanding source or media boundaries by implication. 2. Preserve the estimate wording during Session 18 documentation validation so it remains planning-only, not a spend guarantee. 3. Consider richer actual-vs-estimated comparison only after the runner owns an enforceable cap or durable budget contract. *** ## Session Statistics * **Tasks**: 20 completed * **Files Created**: 0 production files plus session workflow artifacts * **Files Modified**: 14 source/test/doc deliverables plus workflow and version metadata * **Tests Added**: 3 focused test areas * **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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