You keep saying this but have you used an LLM for coding before? You just don’t vibe code up some generated code (well, you can, but it will suck). You are asking it to iterate on code and multiple artifacts at the same time (like tests) in many steps, and you are providing feedback, getting feedback, providing clarifications, checking small chunks of work (because you didn’t just have it do everything at once), etc. You just aren’t executing “vibecode -d [do the thing]” like you would with a traditional shoot once code generator.

It isn’t deterministic like a real programmer isn’t deterministic, and that’s why iteration is necessary.