Tell it to ask you questions before it writes anything

An AI tool would much rather give you an answer than ask you a question. Ask for a comms plan for the office move and you'll get one in seconds, built on guesses about your audience, your dates and your budget. It'll look finished. That's the problem.

One sentence changes it:

I need [WHAT YOU WANT]. Before you write anything, ask me up to [5]
questions that would change what you produce. Ask them one at a time and
wait for my answer. If I say "your call", pick a sensible default and
tell me what you assumed.

One question at a time is on purpose. Eight at once get skimmed, one gets answered. It also asks things you wouldn't have thought to say, like who signs this off, or what's already been tried.

It earns its keep when the brief's still in your head: a job description, a project plan, a tricky email to a stakeholder. I'd skip it for a quick rewrite or a summary of something you've pasted. There's nothing to ask, so you'll just be answering questions for fun.

If you'd rather it got on with it and told you what it guessed, ask for its assumptions at the end instead. And once you've answered everything, save the finished brief as a template, so next time you start from the answers.