This is meta tooling for building skills themselves. It walks you through the directory structure (user vs project scope, precedence rules), the anatomy of SKILL.md with its frontmatter and body, and when to use bundled resources like scripts, references, and assets. The core philosophy is progressive disclosure: keep metadata lean since it's always loaded, put essential instructions in SKILL.md (under 500 lines), and split detailed docs into reference files. Useful if you're creating skills regularly and want to understand the design patterns, though honestly most of this you'd pick up from reading a few existing skills. The emphasis on token efficiency and avoiding context bloat is the most practical takeaway.
npx skills add https://github.com/langchain-ai/deepagents --skill skill-creator