mcp.client.stdio Hangs

[JKChai]

Describe the bug

Testing QuickStart client & server examples hang and doesn't proceed.

To Reproduce

1. Ensure that the client.py from For Client Developers & server.py from For Server Developers are in the same directory.
2. Execute the code (example shown runs in PowerShell).

# uv execute
> uv run client.py .\server.py # python server
# python execute
> py client.py .\server.py 

Expected behavior

Running the example above should return some texts as shown in the QuickStart example. However, it hangs forever.

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Chrome
• Version: 137.0.7151.56

Additional context

I tested mcp.client.sse and it works fine and responded. Therefore, I believe that there is a bug in mcp.client.stdio causing the run to hang.