Sometimes it's nice to throw an LLM at some Nix stuff but I find that unless you're comfortable with the Nix language itself and have spent a tiny amount of time writing a derivation you might introduce quite a few footguns along the way. That said these days when I need a development flake I just point a LLM at the repo and it mostly figures out what's needed. It's just that Nix lends itself pretty well (sadly) to poking around in the dark (yes, I know about the REPL).