# SPEC-050 Implementation Report

**Date**: 2026-05-22
**Spec**: [docs/specs/50-update-skills-project-examples.md](../specs/50-update-skills-project-examples.md)
**Status**: Delivered

## Summary

Replaced all generic / React-Redux examples in the targeted skills with ReviewFlow domain equivalents. The skills now anchor Claude's reasoning in the actual project's ubiquitous language (gateways, use cases, presenters, composition root) instead of textbook code (Employee/CFO, Rectangle/Square, Cart, UserProfile with hooks).

## Scope delivered

| Deliverable | Status |
|-------------|--------|
| Rewrite `solid/SKILL.md` examples — all 5 SOLID principles | Done |
| Replace `tdd/SKILL.md` Cart example | Done |
| Replace `anti-overengineering/SKILL.md` examples (AddressSearch + UserEmail) | Done |
| Verify `product-manager/SKILL.md` is clean | Done (already clean — no change needed) |

## Files touched

| File | Lines before | Lines after | Nature |
|------|--------------|-------------|--------|
| `.claude/skills/solid/SKILL.md` | 410 | 234 | Full SOLID rewrite, deduplicated TypeScript/React duplicates into a single ReviewFlow example per principle |
| `.claude/skills/tdd/SKILL.md` | 349 | 349 | Single Cart → ReviewQueue example swap |
| `.claude/skills/anti-overengineering/SKILL.md` | 176 | 184 | AddressSearch → ReviewActionDispatcher, UserEmail → MergeRequestId branded type |
| `docs/specs/50-update-skills-project-examples.md` | — | +30 | Added "Status: implemented" + Implementation section |
| `docs/feature-tracker.md` | — | 1 row | `drafted 2026-03-14` → `implemented 2026-05-21` |

No production code, no tests, no architecture changes — exactly as the spec scoped.

## Mapping applied (SOLID skill)

| Principle | Anti-pattern shown | ReviewFlow good pattern |
|-----------|--------------------|-------------------------|
| SRP | God-class `ReviewService` mixing trigger + thread fetch + stats persistence (3 actors) | Separate `TriggerReviewUseCase`, `ThreadFetchGateway`, `ReviewStatsPresenter` |
| OCP | `switch (platform)` in the use case | `ThreadFetchGateway` interface + per-platform implementations; new platform = new class |
| LSP | `FileReviewContextGateway` throwing instead of returning `null` | All implementations honor the null-return contract for absence |
| ISP | Fat `ReviewPlatformGateway` (fetch+post+resolve+search) imposed on a read-only presenter | Segregated `ThreadFetchGateway`, `DiffMetadataFetchGateway`, `ReviewActionGateway` |
| DIP | Controller does `new GitLabThreadFetchGateway()` directly | Composition root `routes.ts` injects the abstraction via typed `Dependencies` |

## DoD verification

Acceptance scenarios from the spec, verified by grep:

| Scenario | Verification |
|----------|--------------|
| SOLID uses only ReviewFlow examples | `grep -i "Employee\|Student\|UserProfile\|Rectangle\|Square\|Cart" .claude/skills/solid/SKILL.md` → no matches |
| SOLID has no React/Redux/hooks | `grep -i "React\|Redux\|useState\|useEffect\|configureStore\|createAsyncThunk" .claude/skills/solid/SKILL.md` → no matches |
| TDD has no Cart | `grep -i "Cart" .claude/skills/tdd/SKILL.md` → no matches |
| Anti-overeng has no AddressSearch/UserEmail | `grep -i "AddressSearch\|UserEmailValueObject" .claude/skills/anti-overengineering/SKILL.md` → no matches |
| Globally, banned terms gone in the 4 targeted skills | Both grep commands above run across the 4 skill directories return zero hits |

`yarn verify` — see following command output.

## Notes for future readers

- `product-manager/SKILL.md` was listed in the original spec audit as needing Gherkin replacements (Cart/order/logged-in/profile). At implementation time the file contained none of these. The spec audit table was stale. Left the file untouched.
- The SOLID skill previously had two parallel example tracks ("In TypeScript" + "In React"). They collapsed into a single ReviewFlow track per principle. That trims ~180 lines of redundant content and removes the duplication that made the skill feel half-migrated.
- `MergeRequestId` branded type example in `anti-overengineering` matches the project convention documented in `CLAUDE.md` (branded types for primitives, zero runtime cost).
