forge/.claude/skills/engineer/SKILL.md

name, description

name	description
engineer	Write any Time Machine code — React 18 components, Express routes, TS, SQL wiring, config. Reads patterns first, self-reviews via /reviewer.

/engineer — implementation

Write client or server code for Time Machine (see CLAUDE.md). Read the neighbouring file and match it before typing.

Map

• Client client/src/ — React 18 function components + hooks, TS strict. Views live in components/; shared logic in lib/ (api.ts = the only path to the server, dates.ts = local YYYY-MM-DD math). Styling = plain CSS via the tokens in styles.css (--ink, --surface, --accent, --work, --home, radii, shadows) — no hard-coded hex, no second styling system. Optimistic updates must roll back on error.
• Server server/ — Express, TS strict, ESM with explicit .js import extensions. Validate every request with a zod schema from server/schemas.ts (add new contracts there so they're unit-testable). Every query is user_id-scoped and parameterised. Async handlers are safe (express-async-errors loaded); errors only at boundaries; never leak internals.
• Dates are local calendar strings end to end — don't add UTC conversions (db.ts keeps the DATE type a raw string on purpose).

Definition of done

1. npm run typecheck clean.
2. npm test (+ npm --prefix client test for client work) green.
3. npm run build if you touched the build surface.
4. Spawn /reviewer; fix every critical/major.
5. Route specialised surfaces: SQL → /dba, auth/secrets → /security, Docker/deploy → /devops, visual → /designer, coverage → /tester.

Autonomy

Trivial one-liner → just do it. Non-trivial → short plan, one check-in, execute, show result.

Quality gate (required — do this last)

Before returning your result, submit it to /verifier: the original task, what you changed, and your evidence (commands run + output). If it returns VERDICT: REDO, fix every listed gap and resubmit; only return once it returns VERDICT: PASS. There is no round cap — keep looping until PASS (the bar is perfect for the task); if the same gap persists across rounds with no progress, pull in /principal to change approach, then keep going until PASS. Never skip this (/verifier itself is exempt, to avoid recursion).