This is meta tooling for building Claude Code skills themselves. It walks you through the official specification from code.claude.com, explaining when to use a simple command file versus a full skill directory with frontmatter and supporting files. The key insight here is that commands and skills merged into one system, so your old .claude/commands/ files still work but skills give you more control over invocation and context. You'd reach for this when you're about to write your first custom skill or command and want to understand the conventions. It's essentially documentation wrapped as a skill, which feels appropriately recursive for a plugin that's all about creating plugins.
npx skills add https://github.com/everyinc/compound-engineering-plugin --skill create-agent-skills