I found an easier way that Works For Me (TM). I describe the problem to LLM and ask it to solve it step by step, but strictly in the Ask mode, not Agent. Then I copy or even type the linws to the code. If I wouldn't write the line myself, it doesn't go in, and I iterate some more.

I do allow it to write the tests (lots of typing there), but I break them manually to see how they fail. And I do think about what the tests should cover before asking LLM to tell me (it does come up with some great ideas, but it also doesn't cover all the aspects I find important).

Great tool, but it is very easy to be led astray if you are not careful.