Interactive LLM agent that turns bare feature ideas into full product specs

Use LLM's for that too. My flow is literally take a very bare bones feature idea like "newsletter system" into an agent with instructions that are intended to pull as much insights out of me as possible by prompting ME to fill out more details and go back and forth, then when I am satisfied with that, I say "finalize it" and boom, it writes out a whole spec based on that convo, in copy and pasteable markdown, which I then just paste into claude and let him do his thing.