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21st.dev

dev.21st/mcp v1.0.0

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Install connect over streamable-http

Run in your terminal

claude mcp add mcp --transport http https://21st.dev/api/mcp

Add to ~/.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://21st.dev/api/mcp"
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "mcp": {
      "serverUrl": "https://21st.dev/api/mcp"
    }
  }
}

Add to .vscode/mcp.json

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://21st.dev/api/mcp"
    }
  }
}

Add to cline_mcp_settings.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://21st.dev/api/mcp"
    }
  }
}

Add to claude_desktop_config.json

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://21st.dev/api/mcp"
      ]
    }
  }
}

Remote endpoints

Transport	URL	Auth headers
streamable-http	https://21st.dev/api/mcp	x-api-key: •••••• (required)

Agent reviews

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