> 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-session04-corroboration-gate/tasks.md).

# Task Checklist

**Session ID**: `phase29-session04-corroboration-gate` **Total Tasks**: 22 **Estimated Duration**: 3-4 hours **Created**: 2026-06-19

***

## Legend

* `[x]` = Completed
* `[ ]` = Pending
* `[P]` = Parallelizable (can run with other \[P] tasks)
* `[SNNMM]` = Session reference (NN=phase number, MM=session number)
* `TNNN` = Task ID

***

## Progress Summary

| Category       | Total  | Done   | Remaining |
| -------------- | ------ | ------ | --------- |
| Setup          | 2      | 2      | 0         |
| Foundation     | 6      | 6      | 0         |
| Implementation | 9      | 9      | 0         |
| Testing        | 5      | 5      | 0         |
| **Total**      | **22** | **22** | **0**     |

***

## Setup (2 tasks)

Initial configuration and environment preparation.

* [x] T001 \[S2904] Verify analyzer state, completed prerequisites, and Session 04 stub scope before editing (`.spec_system/PRD/phase_29/session_04_corroboration_gate.md`)
* [x] T002 \[S2904] Verify current source-local, signal-identity, scoring, and action-priority data flow before adding corroboration (`scripts/lib/ai-runtime/source-breakdown.ts`)

***

## Foundation (6 tasks)

Core structures and base implementations.

* [x] T003 \[S2904] \[P] Create corroboration helper contract with schema-validated identity inputs and explicit unavailable fallback (`scripts/lib/ai-runtime/corroboration.ts`)
* [x] T004 \[S2904] Add `corroboration` constants, default object, topic schema field, and legacy-safe parsing with exhaustive enum handling (`src/extensions/trend-finder/schema.ts`)
* [x] T005 \[S2904] Add `originator-only` risk flag, `corroboration_gate` score adjustment key, and action cap/reason enum contracts with explicit fallback behavior (`src/extensions/trend-finder/schema.ts`)
* [x] T006 \[S2904] Prepare source-breakdown wiring types for corroboration assignment and deterministic risk flag merging (`scripts/lib/ai-runtime/source-breakdown.ts`)
* [x] T007 \[S2904] Prepare scoring and action-priority inputs for corroboration-aware downranks and caps with schema-validated input (`scripts/lib/ai-runtime/scoring.ts`)
* [x] T008 \[S2904] Add corroboration label, tone, description, and risk flag copy mappings with accessibility text (`src/extensions/trend-finder/view-model.ts`)

***

## Implementation (9 tasks)

Main feature implementation.

* [x] T009 \[S2904] Implement reviewed-identity entity derivation from source-local metadata, competitor matches, signal syndication groups, and source fallback without new identity providers (`scripts/lib/ai-runtime/corroboration.ts`)
* [x] T010 \[S2904] Implement corroboration status, role count, dominance ratio, caution, and bounded explanation fields with deterministic unavailable handling (`scripts/lib/ai-runtime/corroboration.ts`)
* [x] T011 \[S2904] Wire corroboration into source breakdowns before action recommendations and merge `originator-only` idempotently (`scripts/lib/ai-runtime/source-breakdown.ts`)
* [x] T012 \[S2904] Apply bounded corroboration score downrank and named score adjustment while leaving confirmed topics unaffected (`scripts/lib/ai-runtime/scoring.ts`)
* [x] T013 \[S2904] Cap originator-only action priority below `act_now` with warning and next-step copy that requests independent confirmation (`scripts/lib/ai-runtime/action-priority.ts`)
* [x] T014 \[S2904] Render corroboration in derived source summaries with stable dimensions, labels, focus text, and no layout shift (`src/extensions/trend-finder/components/source-breakdown.tsx`)
* [x] T015 \[S2904] Project corroboration into static Brief export using bounded labels and counts only (`scripts/extensions/trend-finder/static-brief-export.ts`)
* [x] T016 \[S2904] Render static Brief corroboration markup through existing escaping and privacy-safe projection (`scripts/extensions/trend-finder/static-brief-renderer.ts`)
* [x] T017 \[S2904] Update payload reporting and Trend Finder docs for corroboration status, score/action caps, and distinction from `single-source-signal` (`docs/extensions/trend-finder-scoring.md`)

***

## Testing (5 tasks)

Verification and quality assurance.

* [x] T018 \[S2904] \[P] Add helper and source-breakdown tests for originator-only, weak, confirmed, unavailable, competitor, syndication, and risk flag propagation (`scripts/lib/ai-runtime/__tests__/corroboration.test.ts`)
* [x] T019 \[S2904] \[P] Add scoring and action-priority tests proving originator-only topics are down-weighted and cannot become `act_now` (`scripts/lib/ai-runtime/__tests__/scoring.test.ts`)
* [x] T020 \[S2904] \[P] Add schema, view-model, and component tests for legacy defaults, labels, tones, accessibility labels, and long text safety (`src/extensions/trend-finder/__tests__/view-model.test.ts`)
* [x] T021 \[S2904] \[P] Add static Brief privacy tests proving projected corroboration renders without raw entity IDs, private paths, or unreviewed identity internals (`scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts`)
* [x] T022 \[S2904] Run focused Vitest suites, payload-size check, type checks as needed, and ASCII validation for session files (`package.json`)

***

## Completion Checklist

Before marking session complete:

* [x] All tasks marked `[x]`
* [x] All tests passing
* [x] All files ASCII-encoded
* [x] implementation-notes.md updated
* [x] Ready for the validate workflow step

***

## Next Steps

Run the implement workflow step to begin AI-led implementation.


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