FastAPI MCP: Expose FastAPI Endpoints as MCP Tools

Fri, 01 May 2026 00:00:00 +0000

If you have a FastAPI application, you have a potential goldmine of tools for AI agents. FastAPI MCP, created by tadata-org, automatically converts your existing FastAPI endpoints into MCP-compatible tools that AI assistants can discover and invoke, with zero code changes to your application.

The tool works by introspecting your FastAPI route definitions, extracting parameter schemas, descriptions, and authentication requirements, and generating MCP tool definitions on the fly. Every endpoint with a description tag becomes an MCP tool. The integration is automatic and bidirectional–changes to your API are immediately reflected in the available tools.

Key Capabilities

Feature	Description
Automatic conversion	No code changes needed to your FastAPI app
Schema extraction	Uses OpenAPI/Pydantic models for type-safe tool definitions
Auth support	Handles API keys, OAuth, and bearer tokens
Streaming	Supports SSE transport for real-time responses
Documentation	Endpoint descriptions become tool descriptions

Integration Architecture

flowchart LR
 A[FastAPI App] --> B[FastAPI MCP Adapter]
 B --> C[MCP Server]
 C --> D[Tool: GET /users]
 C --> E[Tool: POST /orders]
 C --> F[Tool: PUT /inventory]
 C --> G[Tool: DELETE /items]
 H[AI Agent] --> I[MCP Client]
 I --> J[JSON-RPC]
 J --> C

The adapter sits between your FastAPI application and the MCP protocol. It reads your route definitions and generates MCP tool definitions automatically. When an AI agent calls a tool, the adapter routes the request to the appropriate endpoint and returns the response.

FastAPI MCP on SoloSoft

FastAPI MCP: Expose FastAPI Endpoints as MCP Tools

Key Capabilities

Integration Architecture