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FastMCP

Apache-2.0 Python framework for building MCP servers, clients, apps, and deployable agent tool surfaces.

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FastMCP is an Apache-2.0 Python framework for building MCP servers, clients, and apps with decorators, type hints, transports, auth patterns, deployment docs, and telemetry hooks. The project now resolves to PrefectHQ/fastmcp, with Prefect Horizon available as a separate enterprise MCP gateway for identity, RBAC, audit, monitoring, and server governance.

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FastMCP is a high-level Python framework for building Model Context Protocol servers, clients, and apps without hand-writing every protocol detail. It uses decorators, type hints, resources, prompts, transports, client helpers, deployment guidance, authentication patterns, testing, and telemetry concepts to make MCP development feel closer to normal Python application work.

The project’s canonical GitHub identity now resolves to PrefectHQ/fastmcp, with an active Apache-2.0 repository and a current PyPI 3.x package for Python 3.10+. Prefect Horizon appears in the ecosystem as a separate enterprise MCP gateway for OAuth, RBAC, identity-provider integration, audit, monitoring, server discovery, and deployment governance; those capabilities should be evaluated distinctly from the open-source package.

FastMCP is strongest when a Python team needs to expose internal tools, data, or workflows to MCP-compatible agents quickly while still planning for auth, logging, schema stability, and deployment. It does not replace security architecture: sensitive actions still need authorization, rate limits, input validation, secrets handling, prompt-injection review, and monitoring around every tool surface.

Pricing

Open-source Apache-2.0 package; Prefect Horizon is a separate commercial enterprise MCP gateway for identity, RBAC, audit, deployment, and governance needs.

Platforms

Python 3.10+, MCP servers and clients, decorators, transports, auth, deployment, testing, telemetry/OpenTelemetry docs, CLI, and optional Horizon gateway path.

Categories

MCP ServersAgent Skills & Prompts

Tags

Open SourceFree TierPython

Use Cases

Agentic DevelopmentFull-Stack Development

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Comparisons

FastMCP vs mcp-go — Pythonic MCP Framework vs Go SDK

FastMCP and mcp-go both help teams build Model Context Protocol servers, clients, and tool integrations, but they serve different engineering cultures. FastMCP is the faster default when a Python team wants decorators, type inference, validation, and quick iteration. mcp-go is the better fit when MCP needs to live inside Go CLIs, infrastructure services, and compiled backend systems.

FastMCPmcp-go

FastMCP vs MCP Python SDK — Framework Convenience vs Protocol Primitives

Both FastMCP and the official MCP Python SDK let you build MCP servers in Python — but they make very different bets on what developers actually need. FastMCP trades protocol fidelity for speed: decorators, sensible defaults, and a minimal surface area that gets a server running in minutes. The MCP Python SDK trades convenience for control: direct access to protocol primitives, transport internals, and the full specification. The right choice depends less on the project than on the team — and how much they want to think about the protocol underneath.

FastMCPMCP Python SDK