Start with the approved announcement and turn it into a short source brief. Work in claude and google sheets and capture the concrete operating details: source links, buyer context, audience, claims, proof points, owner, review status, and the final deliverable link. When you use the prompt template attached to this step, paste the real source material, name the expected output sections, and ask the model to flag uncertainty instead of filling gaps. Before moving on, check that the asset matches the channel, the CTA is clear, and the final version is easy to reuse; the expected handoff is A clean announcement brief that defines the message, CTA, claims, and guardrails.