Mozilla has launched the MDN MCP server, an experimental tool that connects AI coding agents and IDEs to MDN's documentation and browser compatibility data via the Model Context Protocol. It works with MCP-compatible clients including VS Code, Cursor, Claude Code, Codex CLI, and Gemini CLI. Testing showed that Claude Code with the MDN MCP provided significantly more accurate browser support information than without it — for example, correctly identifying Firefox 151 as the first browser to ship the `shadowrootslotassignment` attribute and Web Serial API support, where the model without MCP gave outdated or incorrect answers. Responses with the MCP were also roughly twice as fast since the model didn't need to scrape HTML pages for current data.
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Why we built the MDN MCPHow to use the MDN MCPWhat difference does the MCP make?Get involvedWhat's next143.5K Impressions1 Comment