21st.dev

Connect Remote server

claude mcp add --transport http mcp https://21st.dev/api/mcp --header "x-api-key: <X_API_KEY>"

{
  "mcpServers": {
    "mcp": {
      "url": "https://21st.dev/api/mcp",
      "headers": {
        "x-api-key": "<X_API_KEY>"
      }
    }
  }
}

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://21st.dev/api/mcp",
      "headers": {
        "x-api-key": "<X_API_KEY>"
      }
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://21st.dev/api/mcp

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server asks for a key before it lists its tools. Connect it with your own key to see them.

Headers

Details

More developer tools servers See all

• AGILEX Docs

  Official AGILEX robotics product docs: manuals, CAN protocol, firmware, FAQ. Read-only.

• dotsy

  Build and publish static sites on dotsy with draft-first MCP tools, OAuth Connect, and API keys.

• Echoo public catalog

  Read-only Echoo product facts, pricing, documentation and published writing skills.

• Polska Szkoła AI

  AI training catalogue for organisations in Poland and the Kompas AI readiness test (Polish).

• QR Code Creator

  Free QR codes for any URL with no signup or API key, plus scan analytics. Pro makes links editable.

• 99tests

  Order human-run real-device app tests from your coding agent; verified bugs return as fix prompts.