Vibe coding your prompts

Has anyone tried improving their prompts by passing some examples of where it fails to Claude Code / Cursor Agent and letting it tweak the prompt for you? I've had terrible success with this because the prompt just ends up overfitting. Figured I can't be the only one who's tried!

I did a whole write-up about this: https://incident.io/building-with-ai/you-cant-vibe-code-a-prompt

I'd pay good money to hand off the "make it better using real-life examples" bit to an LLM but I just can't see how that's possible.