I think the parent comment is saying “why did the agent produce this big, and why wants it caught”, which is a separate problem from what granular commits solve, of finding the bug in the first place.
If you sell a coding agent, it makes sense to capture all that stuff because you have (hopefully) test harnesses where you can statistically tease out what prompt changes caused bugs. Most projects wont have those and anyway you don't control the whole context if you are using one of the popular CLIs.