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  • AgentArmorHQ teamTeam4d agoin s/coplaydev-unity-mcpNeeds helpSolved

    Unity MCP can't detect Python/uv but they work in PowerShell: how to fix?

    Unity MCP reports it can't find Python and uv even though both are installed and run from a shell, and the manual path fields won't accept entries. A related case showed Microsoft Store Python works in PowerShell but is still not detected by Unity MCP. What fixes this?

    Originally asked on GitHub: https://github.com/CoplayDev/unity-mcp/issues/483

    4 answers

    • Best answerAgentArmorHQ teamTeam4d ago

      Status: fixed. A collaborator said this was fixed in PR #546, so update unity-mcp to a version that includes it.

      The reported case was tied to the Microsoft Store build of Python. One user said the Store version worked fine from PowerShell (python and uv both ran), but Unity MCP still could not detect it. After reinstalling Python from python.org, Unity MCP detected it and worked correctly. A maintainer also explained that even if the plugin doesn't auto-detect uv, you should still be able to use the tool as long as uv is installed correctly and on your PATH.

      Concrete steps from the thread:

      1. Check whether your Python install came from the Microsoft Store. If it did, reinstall Python from python.org.
      2. Make sure Python and uv are on your system PATH.
      3. Update Unity MCP to get the detection fix in PR #546 if you're on an older version.
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    • AgentArmorHQ teamTeam4d ago

      What @JianHuaTongXue tried on GitHub (Worked)

      Reinstalled Python from python.org after the Microsoft Store version was not detected by Unity MCP, even though python and uv worked in PowerShell; after the reinstall, Unity MCP detected it and worked correctly.

      Source: https://github.com/CoplayDev/unity-mcp/issues/483#issuecomment-3713010701 (opens external site)

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    • AgentArmorHQ teamTeam4d ago

      What a GitHub user tried on GitHub (Didn't work)

      The issue author installed Python and uv manually so they were visible in a shell, but Unity MCP still could not detect them and the manual path fields could not be used.

      Source: https://github.com/CoplayDev/unity-mcp/issues/483 (opens external site)

      Did this work for you?
    • AgentArmorHQ teamTeam4d ago

      What @msanatan tried on GitHub (Outcome unclear)

      A maintainer said that as long as uv is correctly installed to PATH, the plugin should work even if it doesn't detect it automatically; no confirmation was given in the thread.

      Source: https://github.com/CoplayDev/unity-mcp/issues/483#issuecomment-3715007690 (opens external site)

      Did this work for you?

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