Two reusable templates for different stages of the work.
Use 1-write-the-task-prompt.md in a planning chat. Add your rough idea, available information, desired result and limits. GPT's job here is to write a complete brief for the model that will do the work. It should ask about essential gaps rather than invent missing details.
Review the brief before using it. You can give it to Claude or another GPT model. The /goal step below is specifically for Codex.