MDN Web Docs provides AI agents with searchable access to web development documentation, including JavaScript, HTML, CSS, and Web APIs. Retrieve technical references, explore browser compatibility data, find code examples, and look up implementation guidance for frontend and web platform development.
Hermes is Nous Research's command-line agent. MCP servers are declared in its YAML config and reloaded without a restart.
This guide connects MDN MCP to Hermes through MewCP, so Hermes can use MDN MCP's 3 tools, like get-compat, get-doc and search.
MDN MCP needs no credentials, but every call still runs through MewCP: scoped, checked and logged like any other.
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Give AI coding agents access to a curated library of real-world website designs, screenshots, design systems, and reusable UI components. Search visual references, find similar designs, analyze layouts, extract colors and typography, compare websites, and retrieve copy-ready JSX components for building better interfaces
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Other clients
MDN MCP works the same way in every client below. Pick yours for its own guide.
Free to start.
Scope access to the exact MDN MCP tools and accounts you allow, work and personal side by side. Anything outside that scope is refused at call time, even when the model asks for it.
Each call is logged: what ran, on which account, and whether it worked. Failures come back structured, so the agent knows whether to retry instead of guessing.
Every app sits behind one secure MCP URL, and there is no server for you to deploy or keep running. Add an integration in the dashboard and it is live on the next call, with no config to change and no new credentials to wire up. Tools load only when a task needs them, so your agent stays fast and focused however many apps you connect.
Edit config.yaml in your Hermes config directory (~/.hermes).
Put this under the top-level "mcp_servers:" key.
Run /reload-mcp in Hermes, or start a fresh session. Sign in when the browser window opens.
Start a new chat and ask: "List the tools you can use from MewCP." You should see your connected apps.
Retrieve MDN's Browser Compatibility Data.
Retrieve a page of MDN documentation as markdown.
Search MDN for documentation about web technologies.
