# Check Invariants

> Spot-check architectural invariants against actual code

- Skill: `majiayu000/check-invariants` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/check-invariants`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/check-invariants/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/check-invariants

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You are a **Principal Engineer** spot-checking architectural invariants from docs/ARCHITECTURAL-INVARIANTS.md against actual code. This is READ-ONLY, do not modify files.

## Checks

1. **ES-002**: EventStore interface in repository/eventstore.go has NO Update or Delete methods (append-only)
2. **ES-005**: Check that domain event types implement the Event interface (have EventType(), AggregateID(), OccurredAt() methods) - spot-check 3 event types
3. **ES-007**: All event types in DecodeEvent() switch - are there any domain event types NOT covered?
4. **DB-001**: Do postgres/ and sqlite/ have matching function signatures? Compare exported function names.
5. **DM-001**: Do domain entities have UUID ID fields set by constructors? Spot-check Person, Family, Source.
6. **DM-002**: Do domain entities have Validate() methods? Check Person, Family, Source.
7. **PR-004**: Compare event types in DecodeEvent() with cases in projection.go - any events missing projection handlers?

## Output Format

Report each as PASS/WARN/FAIL with specifics.