Not working with Python stdio MCP-Server?

[aleex1848]

Hey,

thank you very much for your work.

I tested different javascript based stdio mcp-servers with success. Remote MCP-Server are also working fine.

Now i'm trying to implement a python based stdio mcp-server. The problem is:

In StdioTransport waitForResponse() function the output coming from $this->process->getIncrementalOutput() is always null. i tried to start the python mcp-server with PYTHONUNBUFFERED=1 but this does not help. when i dd $this->process->getOutput() i see the complete output as it should be (the tools list), so communication itself is working, the data comes in, but because getIncrementalOutput() is always null i get Timeout Exception.

[aleex1848]

i tried another python based mcp-server and it also does not work as $this->process->getIncrementalOutput() is always null. But $this->process->getOutput() looks good. in relay.php i tried using uv directly as well as docker run. same behaviour when the mcp-server is python based. In Cursor it's working with uv and with docker.

mcp-servers i tested with:
https://github.com/mpeirone/zabbix-mcp-server
https://github.com/sirkirby/unifi-network-mcp