Mdn MCP Server

by mdn Your server? Claim it

answering

Mdn is answering right now. Last checked 10 min ago. It exposes 3 tools.

Uptime history 47 days of history

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

216 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Mdn every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://mcp.mdn.mozilla.net/

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.mdn.mozilla.net/"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://mcp.mdn.mozilla.net/"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.mdn.mozilla.net/"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://mcp.mdn.mozilla.net/"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

compat

get-compat

Retrieve MDN's Browser Compatibility Data.

doc

get-doc

Retrieve a page of MDN documentation as markdown.

search

Search MDN for documentation about web technologies.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.mdn.mozilla.net/	streamable-http	answering	221 ms	10 min ago

Alternatives to Mdn

same job, measured the same way

MDN Search MCP

Mdn — questions

Answers built from our own checks of this server.

What can Mdn do?

It exposes 3 tools, read directly from the server on our last check. Among them: get-compat, get-doc, search. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Mdn working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 216 ms. The bar chart above shows every period we have measured.

How do I connect Mdn?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Mdn need an API key?

No. Mdn completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Mdn?

It answers our handshake in 216 ms on average, which is faster than 63% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.