Clarifies a rough idea into a precise problem specification through structured dialogue. Asks targeted questions to surface assumptions, scope, constraints, and actors. Produces a specification document defining WHAT needs to change — not HOW to change it. Use when starting a new feature, brainstorming an idea, clarifying requirements, or when a user says "I have an idea", "let's think through", "ideate", "brainstorm", "I want to build", "help me think about", "what should we build".