# Markup (mu-lang) > Markup (`.mu`) is a UTF-8 general-purpose markup language and toolkit. > Site: https://mu.milthe.dev · Package: `@mu-lang/parser` · Repo: https://github.com/milthedev/mu-lang This file lists **plain-text documentation** for LLM and agent consumption. Prefer these over the interactive SPA routes (which need JavaScript). ## Docs - [Library guide (@mu-lang/parser)](https://mu.milthe.dev/library.md): Install, parse, format, lint, typed schemas, multi-file imports, stringify, and the mu CLI. - [Markup syntax specification](https://mu.milthe.dev/syntax.md): Normative language rules, grammar, values, nodes, comments, and directives. ## Full dump - [All docs (concatenated)](https://mu.milthe.dev/llms-full.txt): library + syntax in one file ## Also available - HTML (JS app): https://mu.milthe.dev/library · https://mu.milthe.dev/ - Same markdown via assets: https://mu.milthe.dev/assets/library.md · https://mu.milthe.dev/assets/syntax.md - Playground (interactive): https://mu.milthe.dev/playground - Demos (interactive): https://mu.milthe.dev/demos - GitHub: https://github.com/milthedev/mu-lang - npm: https://www.npmjs.com/package/@mu-lang/parser