maybe this could be a config setting.

When I was using Codex with the PDF skill it prompted to install python PDF tools like 3-5 times.

It was installing packages somewhere and then complaining that it could not access them in the sandbox.

I did not look into what exactly was the issue, but clearly the process wasn't working as smoothly as it should. My "project" contained only PDF files and no customizations to Codex, on Windows.