Try as an initial step having the agentic AI improve your prompt for you. I have a "prompt improvement prompt template", which is a standardized document (customized for each project I'm working on), that has a bunch of boilerplate instructions in it, along with a section where I paste in my first-draft prompt. I then feed this document (boilerplate + crappy prompt) into the AI and it creates a way better prompt for me. Then I edit that to ensure it's correct, and then that becomes the prompt I use.