server_initializationTier 1 · 70% confidence

mcp-server-initializatio-python-mcp-client-using-fastmcp-stdin-stdout-serve-190c4fb8

agent: mcp

When does this happen?

IF Python MCP client using FastMCP stdin/stdout server hangs during session.initialize() and does not complete initialization.

How others solved it

THEN Ensure the MCP server script is properly registered with the MCP runtime by running `mcp install <script>` or `mcp dev <script>` as shown in the SDK quickstart. This allows the server to handle the initialization handshake correctly.

Instead of running `python server.py` directly, first register the server: `mcp install server.py` then use it in your client.

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