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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.4.0]

🚀 FastAPI-MCP now supports Streamable HTTP transport.

HTTP transport is now the recommended approach, following the specification that positions HTTP as the standard while maintaining SSE for backwards compatibility.

⚠️ Breaking Changes

  • mount() method is deprecated and will be removed in a future version. Use mount_http() for HTTP transport (recommended) or mount_sse() for SSE transport.

Added

  • 🎉 Streamable HTTP Transport Support - New mount_http() method implementing the MCP Streamable HTTP specification
  • 🎉 Stateful Session Management - For both HTTP and SSE transports

[0.3.7]

Fixed

  • 🐛 Fix a bug with OAuth default_scope (#123)

[0.3.6]

Skipped 0.3.5 due to a broken release attempt.

Added

  • 🚀 Add configurable HTTP header forwarding (#181)

Fixed

  • 🐛 Fix a bug with handling FastAPI root_path parameter (#163)

[0.3.4]

Fixed

  • 🐛 Update the mcp dependency to 1.8.1. Fixes Issue #134 that was caused after a breaking change in mcp sdk 1.8.0.

[0.3.3]

Fixes the broken release from 0.3.2.

Fixed

  • 🐛 Fix critical bug in openapi conversion (missing param_desc definition) (#107, #99)
  • 🐛 Fix non-ascii support (#66)

[0.3.2] - Broken

This is a broken release and should not be used.

Fixed

[0.3.1]

🚀 FastApiMCP now supports MCP Authorization!

You can now add MCP-compliant OAuth configuration in a FastAPI-native way, using your existing FastAPI Depends() that we all know and love.

Added

  • 🎉 Support for Authentication / Authorization compliant to MCP 2025-03-26 Specification, using OAuth 2.1. (#10)
  • 🎉 Support passing http headers to tool calls (#82)

[0.3.0]

🚀 FastApiMCP now works with ASGI-transport by default.

This means the base_url argument is redundant, and thus has been removed.

You can still set up an explicit base URL using the http_client argument, and injecting your own httpx.AsyncClient if necessary.

Removed

  • ⚠️ Breaking Change: Removed base_url argument since it's not used anymore by the MCP transport.

Fixed

  • 🐛 Fix short timeout issue (#71), increasing the default timeout to 10

[0.2.0]

Changed

  • Complete refactor from function-based API to a new class-based API with FastApiMCP
  • Explicit separation between MCP instance creation and mounting with mcp = FastApiMCP(app) followed by mcp.mount()
  • FastAPI-native approach for transport providing more flexible routing options
  • Updated minimum MCP dependency to v1.6.0

Added

  • Support for deploying MCP servers separately from API service
  • Support for "refreshing" with setup_server() when dynamically adding FastAPI routes. Fixes Issue #19
  • Endpoint filtering capabilities through new parameters:
    • include_operations: Expose only specific operations by their operation IDs
    • exclude_operations: Expose all operations except those with specified operation IDs
    • include_tags: Expose only operations with specific tags
    • exclude_tags: Expose all operations except those with specific tags

Fixed

  • FastAPI-native approach for transport. Fixes Issue #28
  • Numerous bugs in OpenAPI schema to tool conversion, addressing Issue #40 and Issue #45

Removed

  • Function-based API (add_mcp_server, create_mcp_server, etc.)
  • Custom tool support via @mcp.tool() decorator

[0.1.8]

Fixed

  • Remove unneeded dependency.

[0.1.7]

Fixed

[0.1.6]

Fixed

  • Issue #23: Hide handle_mcp_connection tool.

[0.1.5]

Fixed

  • Issue #25: Dynamically creating tools function so tools are useable.

[0.1.4]

Fixed

  • Issue #8: Converted tools unuseable due to wrong passing of arguments.

[0.1.3]

Fixed

  • Dependency resolution issue with mcp package and pydantic-settings

[0.1.2]

Changed

  • Complete refactor: transformed from a code generator to a direct integration library
  • Replaced the CLI-based approach with a direct API for adding MCP servers to FastAPI applications
  • Integrated MCP servers now mount directly to FastAPI apps at runtime instead of generating separate code
  • Simplified the API with a single add_mcp_server function for quick integration
  • Removed code generation entirely in favor of runtime integration

Added

  • Main add_mcp_server function for simple MCP server integration
  • Support for adding custom MCP tools alongside API-derived tools
  • Improved test suite
  • Manage with uv

Removed

  • CLI interface and all associated commands (generate, run, install, etc.)
  • Code generation functionality

[0.1.1] - 2024-07-03

Fixed

  • Added support for PEP 604 union type syntax (e.g., str | None) in FastAPI endpoints
  • Improved type handling in model field generation for newer Python versions (3.10+)
  • Fixed compatibility issues with modern type annotations in path parameters, query parameters, and Pydantic models

[0.1.0] - 2024-03-08

Added

  • Initial release of FastAPI-MCP
  • Core functionality for converting FastAPI applications to MCP servers
  • CLI tool for generating, running, and installing MCP servers
  • Automatic discovery of FastAPI endpoints
  • Type-safe conversion from FastAPI endpoints to MCP tools
  • Documentation preservation from FastAPI to MCP
  • Claude integration for easy installation and use
  • API integration that automatically makes HTTP requests to FastAPI endpoints
  • Examples directory with sample FastAPI application
  • Basic test suite