upgrade-guide

This guide covers breaking changes and migration steps when upgrading FastMCP.

Skills
Development
0

What it does and how to use it

A skill that teaches Claude Code to do development tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/upgrade-guide && curl -fsSL https://doutorai.pt/data/lib/skills__upgrade-guide.md -o .claude/skills/upgrade-guide/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

# Upgrade Guide

> Migration instructions for upgrading between FastMCP versions

This guide covers breaking changes and migration steps when upgrading FastMCP.

## v3.0.0

Most servers need only one change: update your import from `from mcp.server.fastmcp import FastMCP` to `from fastmcp import FastMCP`. The sections below cover less common breaking changes.

### Breaking Changes

#### WSTransport Removed

Use `StreamableHttpTransport` instead.

#### Auth Provider Environment Variables Removed

Auth providers no longer auto-load configuration. Read them explicitly:

```python
import os

auth 

- 🔒 Full content on the Pro plan (€7.99/month) -

Need help with Claude Code?

Ask Dr AI - it explains things simply.

Need a tailor-made solution?

Not sure where to start with AI in your business? Get a free assessment and a tailored plan - no commitment.

Save hours every week with AI, no hassle

Doutor AI gives you 1,859 ready-to-copy AI prompts, by industry and in plain English - plus a complete technical library for those who want to go further.

See plans