FastMCP OpenAPI Server

Example Use Cases

• 1

  Call any HTTP API described by an OpenAPI spec without writing custom adapters.

• 2

  Interact with OAuth2-protected APIs using client credentials to obtain tokens automatically.

• 3

  Streaming or local integrations via SSE or stdio transports (e.g., integrating with Claude Desktop).

Description

This CLI tool loads an OpenAPI specification (local file or URL) and runs a FastMCP-compatible server so agents can call and interact with the described API. It supports stdio or SSE transports, custom HTTP headers, and OAuth2 client-credentials flows for protected APIs. The project is intended to let agents integrate with arbitrary OpenAPI-based services quickly, and includes example configurations for Claude Desktop.