Most founders already have the brief in their head. They stall when they have to type it. Microphone is a voice agent: you talk, it writes the campaign.
Talk through the idea
Hold the microphone and say the problem the way you would say it to a friend. Who has it. Why now. What you would charge. Apple Notes can sit next to the conversation if that is how you already think.
What Microphone writes
A problem statement, hypotheses, and market research you can argue with. Then ads — headlines, bodies, and angles you can reject or ship. Then a campaign you can actually run.
Then put it in front of people
A campaign is not a slide. Generate the ads, spend a little, and see who responds. That is the application: voice in, traffic test out.