_{▶ Watch the Master CSS 2.0 film}

Getting started

• Check out our homepage.
• Read the installation guide to set up Master CSS for an application.

MCP server

This repository also contains the Master CSS Model Context Protocol (MCP) server, published as @master/css-mcp and listed in the MCP Registry as io.github.master-co/master-css. Its source lives in packages/mcp. It is built on the official MCP TypeScript SDK (@modelcontextprotocol/sdk) and runs over stdio.

{
  "mcpServers": {
    "master-css": {
      "command": "npx",
      "args": ["-y", "@master/css-mcp@latest", "--root", "/absolute/path/to/project"]
    }
  }
}

• Tools — inspect, trace and suggest classes; render and compare generated CSS; audit setup, query the manifest and inspect CSS-first directives; lint files or buffers; preview fixes before mastercss_apply_preview writes them.
• Resources — mastercss://workspace/manifest, mastercss://workspace/entries and mastercss://workspace/packages.
• Prompts — debug-missing-css, review-mastercss-classes and migrate-to-mastercss.

See the MCP server README for every tool and the MCP guide for client setup.

Community

• Documentation — Set up Master CSS and look up supported behavior.
• GitHub Discussions — Ask questions, discuss ideas, and share your work. English and Chinese are welcome.
• GitHub Issues — Report reproducible bugs and track implementation work.
• Releases — Follow version changes and release notes.

Use Discussions for technical support so answers remain available to other users. Discord remains a secondary community space; real-time support is not guaranteed. See the support guide.

Our Code of Conduct applies to all Master CSS community channels.

Contributing

Please see our CONTRIBUTING for workflow.

Inspiration

Some of the core concepts and designs are inspired by these giants.

• The concept of enhanced syntax is inspired by SASS and TypeScript
• The concept of Virtual CSS is inspired by the Virtual DOM
• CSS-first theme configuration and the @theme directive are inspired by Tailwind CSS.

License

Master CSS software, reusable examples, and the public skill are licensed under the MIT License. The website copyright notice covers the site's original implementation, prose, illustrations, and brand assets. Code samples provided for reuse and copies of MIT-licensed software remain MIT.