I just got this error when having Codex work on a repo,
The generated diff exceeds our size limit and could not be extracted. This can happen when large binaries, minified assets, or an exceptionally extensive refactor are included in a single commit.
This severely limits the extent to which agents are useful. If we need to expend mental energy to try to figure out if a task is going to go over the limit it might just be easier to do ourselves.