Welcome to FastMCP

FastMCP is a Python-based framework designed for building applications, servers, and clients that implement the Model Context Protocol (MCP). MCP is a protocol that connects large language models (LLMs) to tools and data, enabling agents to interact with and utilize external resources. FastMCP aims to streamline the development process for MCP-compliant applications, allowing developers to move from prototype to production efficiently.

The framework offers a set of features that support the creation of MCP servers, which expose tools, resources, and prompts to LLMs. Developers can declare tools using Python functions, with schema, validation, and documentation generated automatically. FastMCP manages transport negotiation, authentication, and protocol lifecycle, allowing developers to focus on their application logic. For client-side development, FastMCP provides the capability to connect to any MCP server, whether local or remote, and supports both programmatic and command-line interface (CLI) interactions. Additionally, the framework includes "Apps" that render interactive user interfaces directly within conversations, enhancing the interactivity of tools built with FastMCP.

txt (the complete documentation). md to the URL. The documentation itself is accessible via an MCP server endpoint, allowing programmatic search and retrieval through FastMCP clients. The tool is actively maintained, and its documentation reflects the latest development version.

The framework is developed by Prefect and is described as the standard way to build MCP applications. For enterprise deployment, Prefect also offers Horizon, an MCP gateway that adds features like branch previews, rollback, private registries, SSO, RBAC, audit logs, observability, and governance. However, FastMCP itself is focused on providing the core framework for building and running MCP-compliant servers, clients, and interactive applications in Python.