The thing about chatgpt/cursor is that they seem very good at fixing things if they have verbose errors - and nix is very verbose about what it hates in your config. I've given errors to chatgpt and it fixed it for me. With cursor, I had something displaying in a really weird way (plotting a map in js), and I gave it a screenshot and it fixed it immediately.

I would never use llm code in prod without understanding it, but for one-off utilities it has been really great so far.