- reference/SKILL-MIGRATION-GUIDE.md: one-page recipe to add a root SKILL.md to an
existing skill (additive, no rewrite) — target structure, frontmatter checklist,
a verified validation snippet, incremental-adoption guidance. References 16/17.
- CLAUDE.md: replace "Dual-Platform Skill Structure" with the hybrid (root SKILL.md +
code/ + desktop/) as the going-forward standard; add "Root SKILL.md first" design
principle; require a root SKILL.md for new skills; link the guide in Key Reference Files.
- SKILL-FORMAT-REQUIREMENTS.md: note the root-SKILL.md standard + cross-link the guide.
Validation snippet self-tested against 16/17 (frontmatter ≤1024, kebab name, all
referenced relative paths resolve).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
