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Agent frameworks & harnesses · Prefect

Editorial

FastMCP

Python framework for building MCP servers. Version 4.1.8, published November 10, 2026, fixes OAuth proxy token revocation for the client that owns the token.

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Pricing

The GitHub logoGitHub license field was Apache-2.0 on November 11, 2026. The 4.1.8 release notes do not add a server fee. Hosting and the model the client calls are billed separately.

Vendor pricing checked November 11, 2026.

Best fit

Libraries and harnesses for building agents: the loop, tools, memory, and permissions around a model. Listed use: agents. Listed audience: Builders.

Quick facts

Category
Agent frameworks & harnesses
Pricing
Open source
Status
Editorial
Vendor
Prefect
Last verified
November 11, 2026
Use
agents

Features

  • Build MCP servers in Python, including tools generated from OpenAPI
  • OAuth proxy. In 4.1.8, revocation works for the client that owns the token
  • Apache-2.0 on the GitHub logoGitHub repository, read November 11, 2026

Pricing

The GitHub logoGitHub license field was Apache-2.0 on November 11, 2026. The 4.1.8 release notes do not add a server fee. Hosting and the model the client calls are billed separately.

Open source

Social

GitHub

FastMCP 4.1.8 was published at 2026-11-10T20:44:13Z and uploaded to PyPI at 2026-11-10T20:44:54Z. The notes backport 28 fixes from the 4.2 line. The one that changes an MCP auth setup is OAuth proxy token revocation for the client that owns the token.

That release sits in the November 9–11 pin table in AI agent framework release November 2026. How many official MCP servers exist, as a different count, is How many official MCP servers are there?.

Tags

frameworkmcpopen-sourceagents

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Category: Agent frameworks & harnesses

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FastMCP is not a row on Best AI agent harness yet. The first rows of that sourced table are below. Order is not a quality score. Last verified November 2026.

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