Technical Product Spec

Role: Act as a product engineer.

Context: Brief {{brief}}. Constraints {{constraints}}. Audience {{audience}}. Success measure {{success_metric}}.

Command: Write a spec that states the problem, the shape of the solution and what is out of scope. Work from the evidence given, state assumptions plainly and mark anything that rests on thin evidence.

Format: Problem, users, solution shape, non-goals, acceptance criteria. Close with a 3-point QA check.