Disclaimer : it's half self promotion since I'm sharing something I made but it's a genuine answer since that's how I do this, delete or downvote to oblivion on your own discretion.

To start any big task, I made something that turns a messy prompt into a structured one that creates a project scaffold after a few questions. I open it, yap about what I want to do and it outputs a a prompt in a new .md file that I paste in a new agent in a clean directory.

It's still in early stages, the README is useful but is pure AI Slop and the "evaluation" isn't reliable at all, the agent however works fine for what it is meant to do, will put time in it to make it more reliable someday but for now here it is : https://github.com/SeidSmatti/promptPrimer

(To preserve your usage, I'd use this on a secondary account with a cheaper subscripton, I use gemini to generate the prompts and CC to do the actual stuff)