FastMCP

Overview

FastMCP is a full framework for building Model Context Protocol applications. It provides one coherent API for servers, clients, and interactive apps, letting developers expose Python functions as MCP tools, connect to local or remote MCP servers, and return interactive interfaces from tools. FastMCP manages schema generation, validation, transport, authentication, and protocol compatibility around application code.

Key Features

• Unified API for MCP servers, clients, and interactive apps
• Converts Python functions into MCP tools with generated schemas and input/output validation
• Connects clients to local or remote MCP servers with protocol negotiation, authentication, and connection lifecycle handling
• Lets tools return interactive interfaces such as forms, tables, and charts alongside ordinary MCP results
• Manages transport, authentication, and protocol compatibility for application code

Use Cases

• Expose Python application logic as MCP tools, resources, and prompts
• Connect to local or remote MCP servers from Python, the command line, or another MCP application
• Build MCP tools that return forms, tables, charts, and other interactive interfaces alongside ordinary results
• Make documentation searchable by MCP-compatible agents through an MCP server

Getting Started

• Install FastMCP with uv add fastmcp.
• Create a FastMCP instance, decorate a Python function with @mcp.tool, and run the server with mcp.run().

Before You Adopt

• License: Apache-2.0. Review its terms before using, modifying, or distributing the project.
• Documentation may describe features that have not yet reached a stable release.
• The complete documentation file may be too large for some context windows.