Structure and write project documentation beyond the README. Use when docs have sprawled into an unnavigable pile, when users keep asking questions the docs already answer, when choosing a docs site generator (Docusaurus, MkDocs, VitePress, mdBook, Sphinx), or when planning a docs information architecture. Covers the Diataxis framework (tutorial/how-to/reference/explanation), versioning docs across releases, API reference generation, doc testing, and migration guides. Also use for "write docs for this project" or "our docs are bad".
