This is meta tooling for building Claude Code plugins themselves. If you're creating your own skills, this gives you the framework: how to structure workflows, integrate tools, bundle domain expertise, and package everything as a reusable module. It's essentially the onboarding doc for skill authors rather than end users. The approach treats skills as "onboarding guides" that turn Claude into a specialized agent with procedural knowledge. Useful if you're contributing to the ecosystem or want to understand what makes a good skill before you write one. Comes from Anthropic's official repo, so it's the canonical reference.
npx skills add https://github.com/anthropics/claude-code --skill skill-development