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MCP Feature Server

Overview

Feast can expose the Python Feature Server as an MCP (Model Context Protocol) server using fastapi_mcp. When enabled, MCP clients can discover and call Feast tools such as online feature retrieval.

Installation

pip install feast[mcp]

Configuration

Add an MCP feature_server block to your feature_store.yaml:

feature_server:
  type: mcp
  enabled: true
  mcp_enabled: true
  mcp_transport: http
  mcp_server_name: "feast-feature-store"
  mcp_server_version: "1.0.0"

mcp_transport

mcp_transport controls how MCP is mounted into the Feature Server:

  • sse: SSE-based transport. This is the default for backward compatibility.
  • http: Streamable HTTP transport. This is recommended for improved compatibility with some MCP clients.

If mcp_transport: http is configured but your installed fastapi_mcp version does not support Streamable HTTP mounting, Feast will fail fast with an error asking you to upgrade fastapi_mcp (or reinstall feast[mcp]).

Endpoints

MCP is mounted at:

  • /mcp

Connecting an MCP client

Use your MCP client’s “HTTP” configuration and point it to the Feature Server base URL. For example, if your Feature Server runs at http://localhost:6566, use:

  • http://localhost:6566/mcp

Troubleshooting

  • If you see a deprecation warning about mount() at runtime, upgrade fastapi_mcp and use mcp_transport: http or mcp_transport: sse.
  • If your MCP client has intermittent connectivity issues with mcp_transport: sse, switch to mcp_transport: http.