> 1) Once you get it to output something you like, do you check all the lines it changed? Is there a threshold after which you just... hope?

Not op but yes. It sometimes takes a lot of time but I read everything. It still faster than nothing. Also, I ask very precise changes to the AI so it doesn’t generate huge diffs anyway.

Also for new code, TDD works wonders with AI : let it write the unit tests (you still have to be mindful of what you want to implement) and ask it to implement the code that run the tests. Since you talk the probabilistic output, the tool is incredibly good at iterating over things (running and checking tests) and also, unit tests are, in themselves, a pretty perfect prompt.