I was running into errconnrefused responses whenever I attempted to query any of the mcp-unity tools. Unity was telling me that the server was online (though no clients connected) and Claude Code /mcp was telling me that it was connected to the unity-mcp. Realized the issue was that the Unity server lives on the windows machine and my Claude Code instance was running on WSL 2. The simplest solution I have found was to just enable mirrored mode networking in "WSL settings" in Windows which makes it so that localhost is shared between both WSL and WIndows. There may be a better option from your perspective but thought this may be worth including in the README/debugging instructions.

Otherwise awesome project, thanks!