> 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-session12-security-lens/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase29-session12-security-lens` **Completed**: 2026-06-21 **Duration**: 0.8 hours

***

## Overview

Completed the Trend Finder security lens. The session derives bounded topic-level `securityRelevance` from existing browser-safe evidence, reuses the reviewed security keyword category without adding sources, exposes severity/reason/action/citation details through schema defaults, Signal Workbench filtering, static Brief output, QA, payload-size reporting, and documentation, and keeps non-security topics explicitly unavailable.

***

## Deliverables

### Files Created

| File                                                     | Purpose                                                                                                                             | Lines |
| -------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- | ----- |
| `scripts/lib/ai-runtime/security-lens.ts`                | Deterministic security relevance derivation, severity/action taxonomy, bounds, citations, privacy guards, and unavailable fallback. | 429   |
| `scripts/lib/ai-runtime/__tests__/security-lens.test.ts` | Unit coverage for matching, severity/action bounds, deterministic ordering, unavailable output, and private-string rejection.       | 306   |

### Files Modified

| File                                                                        | Changes                                                                                                                         |
| --------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| `scripts/extensions/trend-finder/sources/keyword-packs.ts`                  | Adds a named accessor for the reviewed security keyword category without changing source posture.                               |
| `scripts/lib/ai-runtime/source-breakdown.ts`                                | Attaches security relevance during topic enrichment with unavailable fallback on derivation errors.                             |
| `src/extensions/trend-finder/schema.ts`                                     | Adds security relevance constants, schema, defaults, cited-evidence validation, topic field, and required-derived registration. |
| `src/extensions/trend-finder/view-model.ts`                                 | Adds labels, tones, summaries, action chips, citation projection, and browser-safe security view models.                        |
| `src/extensions/trend-finder/signal-workbench-model.ts`                     | Adds security severity filter state, facets, row fields, summaries, sorting, search indexing, and stale-filter reset.           |
| `src/extensions/trend-finder/components/signal-workbench-controls.tsx`      | Adds the accessible security severity filter control.                                                                           |
| `src/extensions/trend-finder/components/signal-workbench-table.tsx`         | Renders sortable security severity and bounded informational action chips.                                                      |
| `src/extensions/trend-finder/brief-export-model.ts`                         | Projects security lens data into compact Brief data and Markdown output.                                                        |
| `scripts/extensions/trend-finder/static-brief-export.ts`                    | Adds static Brief security lens report schema, projection, bounds, and unavailable mapping.                                     |
| `scripts/extensions/trend-finder/static-brief-renderer.ts`                  | Renders the static Brief security lens callout, empty state, actions, reasons, and citations.                                   |
| `scripts/extensions/trend-finder/static-brief-qa.ts`                        | Adds section marker, structure checks, citation checks, action bounds, and privacy failure mapping.                             |
| `scripts/extensions/trend-finder/measure-payload-size.ts`                   | Tracks `data.topics[].securityRelevance` as a high-pressure browser payload branch.                                             |
| `scripts/extensions/trend-finder/required-derived-fields.ts`                | Registers the new topic-level required derived branch for closeout.                                                             |
| `src/extensions/trend-finder/fixtures.ts`                                   | Adds default security relevance fixture data.                                                                                   |
| `scripts/lib/ai-runtime/__tests__/source-breakdown.test.ts`                 | Covers source-breakdown integration and privacy behavior.                                                                       |
| `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts`      | Covers schema defaults, view-model projection, filters, facets, sorting, row chips, and re-entry reset.                         |
| `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts`     | Covers static Brief security projection and privacy-clean rows.                                                                 |
| `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts`   | Covers rendered security lens section, public links, and unsafe URL filtering.                                                  |
| `scripts/extensions/trend-finder/__tests__/static-brief-qa.test.ts`         | Covers missing citations, over-bound rows, and private-string failures.                                                         |
| `scripts/extensions/trend-finder/__tests__/measure-payload-size.test.ts`    | Covers present and legacy-missing security relevance branch reporting.                                                          |
| `scripts/extensions/trend-finder/__tests__/required-derived-fields.test.ts` | Covers closeout shape registration.                                                                                             |
| `docs/extensions/trend-finder-pipeline.md`                                  | Documents derivation, source boundary, unavailable states, privacy behavior, and payload visibility.                            |
| `docs/extensions/trend-finder-ui-surfaces.md`                               | Documents the shipped Workbench filter and static Brief security callout.                                                       |

***

## Technical Decisions

1. **Existing evidence only**: The lens reads normalized topic, evidence, source, and keyword metadata already present in the payload.
2. **Reviewed category reuse**: The existing reviewed `security` keyword category is a signal, not approval for a new collector or source.
3. **Conservative unavailable fallback**: Sparse, ambiguous, legacy, or failed derivation paths publish explicit unavailable output.
4. **Informational actions only**: Action items stay bounded labels for operator review and do not imply remediation or execution.
5. **Browser-safe projection**: Static Brief and Workbench surfaces expose bounded labels, IDs, safe public citation URLs, and no raw/private source payloads.

***

## Test Results

| Metric   | Value         |
| -------- | ------------- |
| Tests    | 3837          |
| Passed   | 3837          |
| Coverage | Not collected |

Validation also passed `bun run lint`, `bun run typecheck`, `bun run typecheck:scripts`, scoped Prettier checks, `git diff --check`, payload-size reporting, static Brief dry-run QA/privacy checks, and ASCII/LF validation.

***

## Lessons Learned

1. Derived vertical lenses should publish explicit unavailable states so sparse evidence does not imply false precision.
2. Payload-size tooling is more useful when it reports high-pressure branches even when legacy data omits the branch.
3. Static Brief privacy checks need to cover each new report section as soon as the section becomes browser-visible.

***

## Future Considerations

Items for future sessions:

1. Keep Session 13 static Brief archival work aligned with the new `securityRelevance` branch and section marker.
2. Reuse the bounded derived-field pattern for upcoming One-to-Watch and pre-run estimate surfaces.
3. Do not widen security sourcing without a separate compliance-reviewed source boundary.

***

## Session Statistics

* **Tasks**: 23 completed
* **Files Created**: 2 source/test files plus session workflow artifacts
* **Files Modified**: 23 source/test/doc/tracking files plus version metadata
* **Tests Added**: 6 focused test areas
* **Blockers**: 0 resolved


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