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.. _howto/connection:mcp:

MCP Server Connection

The MCP connection type configures access to MCP (Model Context Protocol) <https://modelcontextprotocol.io/>__ servers. Three transport types are supported: Streamable HTTP, SSE, and stdio.

Default Connection IDs

The MCPHook uses mcp_default by default.

Configuring the Connection

Transport (Extra field) The transport type: http (default), sse, or stdio.

- ``http``: Streamable HTTP — the recommended transport for remote servers.
- ``sse``: Server-Sent Events — deprecated in favor of Streamable HTTP.
- ``stdio``: Run the MCP server as a subprocess communicating over stdin/stdout.

Host The server URL. Required for http and sse transports.

Examples: ``http://localhost:3001/mcp``, ``https://mcp.example.com/v1``

Auth Token (Password field) Optional authentication token for the MCP server.

Command (Extra field) The command to run for stdio transport. Required when transport is stdio.

Examples: ``uvx``, ``python``, ``node``

Arguments (Extra field) JSON array of arguments for the stdio command.

Examples: ``["mcp-run-python"]``, ``["-m", "my_mcp_server"]``

Examples

HTTP transport (remote MCP server)

.. code-block:: json

{
    "conn_type": "mcp",
    "host": "http://localhost:3001/mcp"
}

SSE transport

.. code-block:: json

{
    "conn_type": "mcp",
    "host": "http://localhost:3001/sse",
    "extra": "{\"transport\": \"sse\"}"
}

Stdio transport (subprocess)

.. code-block:: json

{
    "conn_type": "mcp",
    "extra": "{\"transport\": \"stdio\", \"command\": \"uvx\", \"args\": [\"mcp-run-python\"]}"
}

Stdio with custom timeout

.. code-block:: json

{
    "conn_type": "mcp",
    "extra": "{\"transport\": \"stdio\", \"command\": \"python\", \"args\": [\"-m\", \"my_server\"], \"timeout\": 30}"
}