v1.2.0rc1

MCP Python SDK v1.2.0rc1 Release Notes

Major Features

FastMCP Integration

• Integrated FastMCP as the recommended high-level server framework
• Added new mcp.server.fastmcp module with simplified decorator-based API
• Introduced FastMCP class for easier server creation and management
• Added comprehensive documentation and examples for FastMCP usage

New CLI Package

• Added new CLI package for improved developer experience
• Introduced mcp dev command for local development and testing
• Added mcp install command for Claude Desktop integration
• Added mcp run command for direct server execution

Improvements

Documentation

• Completely revamped README with new structure and examples
• Added detailed sections on core concepts (Resources, Tools, Prompts)
• Updated documentation to recommend FastMCP as primary API
• Added sections on development workflow and deployment options
• Improved example server documentation

Developer Experience

• Added pre-commit hooks for code quality
• Updated to Pydantic 2.10.0 for improved type checking
• Added uvicorn as a dependency for better server capabilities

Bug Fixes

• Fixed deprecation warnings in core components
• Fixed Pydantic field handling for meta fields
• Fixed type issues throughout the codebase
• Fixed example server READMEs

Breaking Changes

• Deprecated direct usage of mcp.server in favor of mcp.server.fastmcp
• Updated import paths for FastMCP integration
• Changed recommended installation to include CLI features (pip install "mcp[cli]")

Contributors

Special thanks to all contributors who made this release possible, including:

• Jeremiah Lowin (FastMCP)
• Oskar Raszkiewicz

Full Changelog: v1.1.2...v1.2.0rc1