canonical-format-checkerlisted

# Canonical Format Checker ## Overview Prevent format drift by verifying content follows authoritative canonical sources. When teaching a pattern that exists elsewhere in the platform (skills, subagents, ADRs, etc.), this skill ensures the taught format matches the canonical source. **Why this matters**: The Chapter 14 format drift failure occurred because the lesson taught skill format differently from Chapter 5 (canonical source). Students learned incorrect patterns that contradicted earlier chapters. ## When to Use This Skill **Automatic Triggers** (check before implementation): - Lesson teaches how to create skills → Check `.claude/skills/` structure - Lesson teaches how to write subagents → Check `.claude/agents/` structure - Lesson teaches ADR format → Check `specs/*/adrs/` structure - Lesson teaches PHR format → Check `history/prompts/` structure - Lesson teaches specification format → Check `specs/*/spec.md` structure **Manual Triggers** (user requests): - "Check canonical format for skills" - "Verify format consistency" - "Does this match the canonical source?" ## Canonical Source Lookup Table | Pattern Being Taught | Canonical Source Location | Key Format Elements | |---------------------|--------------------------|---------------------| | **Skills** | `.claude/skills/<name>/SKILL.md` | Directory structure, YAML frontmatter with `name`, `description` | | **Subagents** | `.claude/agents/<name>.md` | YAML frontmatter with `name`, `de