Can the Product agent write a PRD from scratch? Product writes full PRDs with a required problem statement, quantified success metrics (it rejects “improve user experience” without a measurable baseline), explicit non-goals to protect scope, user stories, open questions, and dependencies. Every PRD must have metrics engineering can verify post-ship; the agent flags any spec where success is undefined before delivering. You can ask it to target the output for engineering, a board presentation, or customer-facing communication — each version is structured differently.