I always build a massive testing harness. I care about correctness, of course, and that is normally dealt with by the AI without having to ask. If you ask for a function, it will write tests.

But I also care about the complexity classes of the solution. I prod it about the time and space complexity, and about cache locality.

I do a lot of black box testing: take the solution, see if it does what I expected, then bake in those expectations in a document.

I find that if I do those things, it produces better code than I could do in the same time.

I also think it's more or less the same as how I used to work, just more thorough and with fewer time-consuming, trivial bugs.