Cannot run latest Demo server in Claude Desktop - FastMCP, python-SDK v1.2.0

[wanderingnature]

Describe the bug
Trying out latest Python-SDK with FastMCP, error connecting to Claude.

To Reproduce
Steps to reproduce the behavior:
Follow the example at: https://github.com/modelcontextprotocol/python-sdk

created server.py

# server.py
from mcp.server.fastmcp import FastMCP

# Create an MCP server
mcp = FastMCP("Demo")

# Add an addition tool
@mcp.tool()
def add(a: int, b: int) -> int:
    """Add two numbers"""
    return a + b

# Add a dynamic greeting resource
@mcp.resource("greeting://{name}")
def get_greeting(name: str) -> str:
    """Get a personalized greeting"""
    return f"Hello, {name}!"

@mcp.resource("config://app")
def get_config() -> str:
    """Static configuration data"""
    return "App configuration here"

@mcp.resource("users://{user_id}/profile")
def get_user_profile(user_id: str) -> str:
    """Dynamic user data"""
    return f"Profile data for user {user_id}"

Note: I added the two resources to the example to test resources (static) and resource_templates...

Expected behavior
It works.... (I can run in inspector with 'mcp dev server.py')
Claude Desktop connection not possible:
Screenshots

Used 'mcp install server.py' and receive error at startup of desktop client.
No messages are logged in mcp-server-Demo.log

Desktop (please complete the following information):

• OS: Monterey 12.7.6
• Browser Chrome

Additional context
Claude Congfiguration: (unchanged)
"Demo": {
"command": "uv",
"args": [
"run",
"--with",
"mcp",
"mcp",
"run",
"/Volumes/Dev12TB/fastmcp-servers-dev/fastmcp-test/server.py"
]
}

The same command, e.g. uv with arguments 'run --with mcp mcp run server.py' are used in inspector

[dsp-ant]

Thanks for the report. I can reproduce this.

[dsp-ant]

More clarification in the docs now as well how to start the server appropriately: modelcontextprotocol/docs#104

[gyger]

I think that warrants to release 1.2.1, because all examples are broken. My temporary fix is to use
mcp = FastMCP("Echo", dependencies=["mcp[cli]"])