Codex has got me a few times lately, doing what I asked but certainly not what I intended:

- Get rid of these warnings "...": captures and silences warnings instead of fixing them - Update this unit test to relfect the changes "...": changes the code so the outdated test works - The argument passed is now wrong: catches the exception instead of fixing the argument

My advice is to prefer small changes and read everything it does before accepting anything, often this means using the agent actually is slower than just coding...