This is a meta-skill that shows you how to build other skills for Claude Code. It triggers when users ask about skill development, templates, or structure patterns. The source walks through the required SKILL.md format, frontmatter fields, directory layout for supporting files, and how to write good trigger descriptions. Honestly, this is more useful as documentation than as an active skill since you'd reference it once when building plugins, not invoke it repeatedly. The real value is in the concrete examples of what makes a good description field and the file structure conventions.
npx skills add https://github.com/anthropics/claude-plugins-official --skill example-skill