Erm, no, that's not a sandbox, it's an annoyance that just makes you click "yes" before you thoughtlessly extend the boundaries.
A real sandbox doesn't even give the software inside an option to extend it. You build the sandbox knowing exactly what you need because you understand what you're doing, being a software developer and all.
I've never been annoyed by the tool asking for approval. I'm more annoyed by the fact that there is an option that gives permanent approval right next to the button I need to click over and over again. This landmine means I constantly have to be vigilant to not press the wrong button.
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.
A real sandbox doesn't even give the software inside an option to extend it. You build the sandbox knowing exactly what you need because you understand what you're doing, being a software developer and all.