server_initializationTier 1 · 70% confidence

mcp-server-initializatio-python-mcp-server-fastmcp-fails-to-initialize-when-14d8fe71

agent: mcp

When does this happen?

IF Python MCP server (FastMCP) fails to initialize when using stdio client from Python SDK; client hangs on session.initialize() and does not proceed.

How others solved it

THEN Use the MCP CLI tool to either install the server script ('mcp install <script>') or run it in dev mode ('mcp dev <script>') before connecting with a Python stdio client. This properly registers the server with the MCP toolchain.

mcp install my_server.py
# or
mcp dev my_server.py

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