If you're building or optimizing Claude skills, this is your meta-tool. It walks you through the whole structure: frontmatter metadata, the 150-line rule for SKILL.md files, when to bundle scripts versus references, and how progressive disclosure keeps context lean. The guidance is opinionated about combining related topics (it suggests merging cloudflare-* skills into a single devops skill) and strict about descriptions staying under 200 characters so auto-activation actually works. What's useful here is the practical stuff: script environment variable precedence order, the reminder to write tests, and the emphasis on teaching Claude how to do tasks rather than documenting what tools are. It's basically the style guide and architectural decisions document rolled into one.
npx skills add https://github.com/mrgoonie/claudekit-skills --skill skill-creator