Comment by simonw

I wonder if the author is using automated tests.

My hunch is that good automated testing is an enormous factor with respect to how productive you can get with coding agent tools.

Thorough tests? Just like working without LLMs you can confidently make changes without fear of breaking other parts of the application.

No tests at all? Any change you make is a roll of the dice with respect to how it affects the rest of your existing code.