FastMCP

FastMCP is a Python framework for building Model Context Protocol (MCP) servers, clients, and applications with minimal boilerplate. It provides a structured, Pythonic interface for defining tools, resources, and prompts that can be exposed to MCP-compatible clients such as AI assistants and automation agents. The primary purpose of FastMCP is to make it straightforward for developers to integrate external systems, APIs, and data sources into MCP workflows using familiar Python patterns.

The framework offers decorators and type-annotated interfaces for defining MCP tools, enabling automatic request/response validation and clear contracts between clients and servers. It supports structured resources, streaming responses, and standardized error handling, helping developers produce predictable, debuggable integrations. FastMCP also includes utilities for running MCP servers, managing configuration, and connecting to multiple MCP clients, so you can focus on business logic rather than protocol details. Its design emphasizes clarity and maintainability, making it easier to scale from simple prototypes to production-grade MCP services.