implement-spec

name	implement-spec
description	Implement a specification (or specific phases of a spec) using coordinated subagents. Handles multi-phase spec implementation with unit tests, integration tests, documentation, and code-review compliance. Use when the user says "implement spec", "implement the spec", "implement phases", "build from spec", or "code the spec". Tracks progress by updating the spec with implementation status.

Implement Spec Skill

Implements a specification (or selected phases) end-to-end using a team of coordinated subagents. Every code change MUST pass the code-review checklist before the phase is considered done.

Pre-Flight

1. Identify the spec: Locate the target spec file in .ai/specs/.
2. Load context: Read spec fully. Match affected tasks to the Task → Context Map in AGENTS.md and read all listed files (guides and skills).
3. Load code-review checklist: Read .ai/skills/code-review/references/review-checklist.md — this is the acceptance gate for every phase.
4. Load lessons: Read .ai/lessons.md for known pitfalls.
5. Scope phases: If the user specifies phases (e.g. "phases c-e"), filter to only those. Otherwise implement all phases sequentially.

Implementation Workflow

For each phase in the spec, execute these steps:

Step 1 — Plan the Phase

Read the phase from the spec. For each step within the phase:

• Identify files to create or modify (all paths under src/modules/)
• Identify which guides and skills apply (use the Task → Context Map in AGENTS.md)
• List required exports, conventions, and patterns from the relevant guides
• Note any cross-module impacts (events, extensions, widgets, enrichers)

Present a brief plan to the user before coding.

Step 2 — Implement

Use subagents liberally to parallelize independent work:

• One subagent per independent file/component when files don't depend on each other
• Sequential execution when there are dependencies (e.g., entity before API route before backend page)

For every piece of code, enforce these code-review rules inline:

Area	Rule
Types	No any — use zod + z.infer
API routes	Export openApi and per-method metadata with requireAuth / requireFeatures (no top-level export const requireAuth)
CRUD APIs	Use makeCrudRoute({ entity, entityId, operations, schema, indexer: { entityType } }) from @open-mercato/shared/lib/crud/factory. Custom write routes MUST call validateCrudMutationGuard before the mutation and runCrudMutationGuardAfterSuccess after success. See AGENTS.md → Mandatory Module Mechanisms.
Entities	Standard columns, snake_case, UUID PKs, indexed organization_id + tenant_id
Security	findWithDecryption, tenant scoping, zod validation
Encryption maps	For every PII / GDPR-relevant column the phase touches, declare in <module>/encryption.ts exporting defaultEncryptionMaps (type from @open-mercato/shared/modules/encryption). Reads via findWithDecryption / findOneWithDecryption (5-arg (em, entity, where, options?, scope?)). Equality-lookup columns declare a sibling hashField. NEVER hand-rolled AES/KMS, crypto.subtle, or "encrypt later" stubs. See AGENTS.md → CRITICAL Rule #11 (Encryption maps) + the "Encryption maps" row of the Mandatory Module Mechanisms table; .ai/skills/data-model-design/SKILL.md § Sensitive Data and Encryption Maps; .ai/skills/module-scaffold/SKILL.md § Encryption maps.
UI	<CrudForm>/<DataTable> (with stable entityId + extensionTableId), apiCall (never raw fetch), flash(), <LoadingMessage>/<ErrorMessage>

Step 3 — Unit Tests

For every new feature/function implemented in the phase:

• Create unit tests colocated with the source (e.g., *.test.ts or __tests__/)
• Test happy path + key edge cases
• Test error paths for validation and authorization
• Mock external dependencies (DI services, data engine)
• Verify tests pass: yarn test

Step 4 — Integration Tests

If the spec defines integration test scenarios (or the phase adds API endpoints / UI flows):

• Follow the integration-tests skill workflow (.ai/skills/integration-tests/SKILL.md)
• Place tests in src/modules/<module>/__integration__/TC-{CATEGORY}-{XXX}.spec.ts
• Tests MUST be self-contained: create fixtures in setup, clean up in teardown
• Tests MUST NOT rely on seeded/demo data
• Run and verify: npx playwright test --config .ai/qa/tests/playwright.config.ts <path> --retries=0

If the spec does not explicitly list integration scenarios but the phase adds significant API or UI behavior, propose test scenarios to the user before writing them.

Step 5 — Documentation

For each new feature:

• Add/update locale files for new i18n keys
• If new entities with user-facing text: create translations.ts
• If new convention files: run yarn generate
• Update relevant guides or AGENTS.md if the feature introduces new patterns developers should follow

Step 6 — Self-Review (Code-Review Gate)

Before marking a phase complete, run a self-review against the checklist (.ai/skills/code-review/references/review-checklist.md):

1. Architecture & Module Independence (section 1)
2. Security (section 2)
3. Data Integrity & ORM (section 3)
4. API Routes (section 4) — if applicable
5. Events & Commands (section 5) — if applicable
6. UI & Backend Pages (section 6) — if applicable
7. Naming Conventions (section 7)
8. Anti-Patterns (section 8)

Fix any violations before proceeding to the next phase.

Step 7 — Update Spec with Progress

After completing each phase, update the spec file:

• Add an ## Implementation Status section at the bottom (or update it if it exists)
• Use this format:

## Implementation Status

| Phase | Status | Date | Notes |
|-------|--------|------|-------|
| Phase A — Foundation | Done | 2026-02-20 | All steps implemented, tests passing |
| Phase B — Menu Injection | Done | 2026-02-21 | 3/3 steps complete |
| Phase C — Events Bridge | In Progress | 2026-02-22 | Step 1-2 done, step 3 pending |
| Phase D — Enrichers | Not Started | — | — |

• For the current phase, mark individual steps:

### Phase C — Detailed Progress
- [x] Step 1: Create event definitions
- [x] Step 2: Implement SSE bridge
- [ ] Step 3: Add client-side hooks

Step 8 — Verification

After all targeted phases are complete:

1. Generate check: yarn generate — must complete without errors
2. Type check: yarn typecheck — must pass (if available)
3. Build check: yarn build — must pass
4. Unit test check: yarn test — must pass
5. Integration test check: run any new integration tests — must pass
6. Migration check: yarn db:generate — if any entities changed (verify the resulting SQL is scoped correctly; manual SQL is acceptable only when avoiding unrelated churn, and the touched .snapshot-open-mercato.json must match)

Report results to the user. If any check fails, fix and re-verify.

Subagent Strategy

Task	Agent Type	When
Research existing patterns	Explore	Before implementing unfamiliar patterns
Implement independent files	general-purpose	When files have no dependencies on each other
Run tests	Bash	After each phase
Self-review	general-purpose	After each phase, against checklist
Integration tests	general-purpose	After phases with API/UI changes

Concurrency rule: Launch parallel subagents only for truly independent work. Sequential for dependent files.

Rules

• MUST read the full spec before starting implementation
• MUST read all guides and skills listed in the Task → Context Map before coding
• MUST pass every applicable code-review checklist item before marking a phase done
• MUST update the spec with implementation progress after each phase
• MUST run yarn build after final phase to verify no build breaks
• MUST create unit tests for all new behavioral code
• MUST create or propose integration tests for phases with API endpoints or UI flows
• MUST NOT skip the self-review step — it is the quality gate
• MUST NOT introduce any types, hardcoded strings, raw fetch, or other anti-patterns
• MUST keep subagents focused — one task per subagent, clear boundaries
• MUST report blockers to the user immediately rather than working around them silently
• MUST run yarn generate after creating or modifying module convention files
• MUST run yarn db:generate after creating or modifying entities (and confirm migration with user before applying)