> 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-session03-reception-signal-aggregate-only/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase29-session03-reception-signal-aggregate-only` **Completed**: 2026-06-19 **Duration**: 0.5 hours

***

## Overview

Completed Phase 29 Session 03 by adding Trend Finder's aggregate-only `receptionSignal` field and filling the live/static polarity grid's reserved reception column. Runtime derivation now emits endorsed, contested, ratioed, mixed, or unavailable states from already-normalized aggregate metrics only. Contested and ratioed topics receive `contested-reception` risk handling and cannot produce `act_now`, while schema defaults, trace projection, static Brief rendering, tests, and docs preserve the no-comment-body boundary.

***

## Deliverables

### Files Created

| File                                                                                             | Purpose                                                                  | Lines |
| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------ | ----- |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/spec.md`                   | Session specification and scope.                                         | 275   |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/tasks.md`                  | Completed task checklist.                                                | 96    |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/implementation-notes.md`   | Task-by-task implementation notes.                                       | 608   |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/security-compliance.md`    | Security and GDPR review for the session.                                | 98    |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/validation.md`             | Validation report and command evidence.                                  | 248   |
| `.spec_system/specs/phase29-session03-reception-signal-aggregate-only/IMPLEMENTATION_SUMMARY.md` | Completion summary for updateprd.                                        | 125   |
| `scripts/lib/ai-runtime/reception-signal.ts`                                                     | Aggregate-only reception derivation helper with bounded fallback states. | 243   |
| `scripts/lib/ai-runtime/__tests__/reception-signal.test.ts`                                      | Helper coverage for thresholds, unsupported inputs, and body exclusion.  | 135   |

### Files Modified

| File                                                                                | Changes                                                                                                                 |
| ----------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| `src/extensions/trend-finder/schema.ts`                                             | Added reception enum/defaults, topic field parsing, `contested-reception`, action cap reasons, and calibration version. |
| `scripts/lib/ai-runtime/source-breakdown.ts`                                        | Attached reception derivation before action recommendations and merged risk flags idempotently.                         |
| `scripts/lib/ai-runtime/action-priority.ts`                                         | Added contested/ratioed reception caps, warnings, and blocked-from-act-now calibration.                                 |
| `scripts/lib/ai-runtime/action-consistency.ts`                                      | Accepted the new reception risk flag in action consistency parsing.                                                     |
| `scripts/extensions/trend-finder/collector.ts`                                      | Added enum-only reception trace counts and per-topic reception summaries.                                               |
| `scripts/extensions/trend-finder/engine-trace.ts`                                   | Mapped reception into sanitized Engine Replay topic summaries.                                                          |
| `src/extensions/trend-finder/engine-trace.ts`                                       | Parsed sanitized reception values with unavailable fallback.                                                            |
| `src/extensions/trend-finder/view-model.ts`                                         | Added reception labels, tones, descriptions, risk copy, and grid projection.                                            |
| `src/extensions/trend-finder/fixtures.ts`                                           | Added representative reception states for live and replay fixtures.                                                     |
| `src/data/live-data.example.json`                                                   | Added example reception states for payload reporting.                                                                   |
| `scripts/extensions/trend-finder/static-brief-export.ts`                            | Preserved projected reception cells in static Brief output.                                                             |
| `scripts/extensions/trend-finder/static-brief-renderer.ts`                          | Rendered escaped reception cells in static Brief HTML.                                                                  |
| `scripts/extensions/trend-finder/measure-payload-size.ts`                           | Included `data.topics[].receptionSignal` in payload pressure reporting.                                                 |
| `scripts/lib/ai-runtime/__tests__/source-breakdown.test.ts`                         | Covered reception assignment and risk flag propagation.                                                                 |
| `scripts/lib/ai-runtime/__tests__/action-priority.test.ts`                          | Covered contested/ratioed action caps and endorsed non-cap behavior.                                                    |
| `src/extensions/trend-finder/__tests__/view-model.test.ts`                          | Covered legacy defaults, labels, tones, and projected grid rows.                                                        |
| `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts`              | Updated risk facet expectations for `contested-reception`.                                                              |
| `src/extensions/trend-finder/components/__tests__/polarity-attention-grid.test.tsx` | Replaced reserved-cell assertions with reception accessibility coverage.                                                |
| `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts`             | Covered projected reception cells and static Brief privacy behavior.                                                    |
| `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts`           | Covered escaped reception cell rendering.                                                                               |
| `scripts/extensions/trend-finder/__tests__/engine-trace.test.ts`                    | Proved enum-only reception traces exclude body-like sentinel text.                                                      |
| `src/lib/__tests__/trend-finder-schema.test.ts`                                     | Updated fixture expectation for the new contested reception risk flag.                                                  |
| `tests/e2e/trend-finder.spec.ts`                                                    | Updated live grid expectations from placeholder to reception labels.                                                    |
| `tests/e2e/trend-finder-static-brief.spec.ts`                                       | Updated static Brief expectations from placeholder to reception labels.                                                 |
| `docs/extensions/trend-finder-scoring.md`                                           | Documented reception states, aggregate-only derivation, risk flag, and action cap.                                      |
| `docs/extensions/trend-finder-ui-surfaces.md`                                       | Documented live/static reception grid behavior and privacy boundary.                                                    |
| `.spec_system/state.json`                                                           | Marked the session complete and reset the active session.                                                               |
| `.spec_system/PRD/phase_29/PRD_phase_29.md`                                         | Updated progress to 3/18 sessions complete.                                                                             |
| `package.json`                                                                      | Bumped version from `0.1.347` to `0.1.348`.                                                                             |
| `README.md`                                                                         | Synced visible version line to `0.1.348`.                                                                               |
| `docs/CHANGELOG.md`                                                                 | Added Phase 29 Session 03 release notes.                                                                                |

***

## Technical Decisions

1. **Keep reception aggregate-only**: The helper accepts bounded source identity, role/type, and aggregate metric counts, returning `unavailable` for thin or unsupported inputs instead of inferring sentiment from text.
2. **Cap action priority through existing contracts**: `contested-reception` uses the established action warning/cap path so ratioed and contested topics cannot bypass normal recommendation safety.
3. **Expose enum-only surfaces**: Browser payloads, Engine Replay traces, and static Brief output publish bounded enum labels and descriptions, not raw evidence rows, prompt text, provider output, private paths, or comment bodies.

***

## Test Results

| Metric   | Value         |
| -------- | ------------- |
| Tests    | 3725          |
| Passed   | 3725          |
| Coverage | Not collected |

***

## Lessons Learned

1. Engine Replay fixture summaries needed explicit reception values once the enum became part of the sanitized topic contract.
2. Static Brief projection is the right boundary for reception display because it keeps export rendering on already-safe view-model cells.

***

## Future Considerations

Items for future sessions:

1. Session 04 can build corroboration gates on top of the new reception-aware risk and action cap behavior.
2. Session 08 should include `receptionSignal` in the required-derived-field closeout gate so future regressions cannot silently drop the field.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 8
* **Files Modified**: 31
* **Tests Added**: 12 suites or guards
* **Blockers**: 0 resolved


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