Analyze whether a new design fits the system that already exists — conventions, components, vocabulary, and visual rules of the product it lives in. Use this whenever the user asks about consistency, whether something "feels off," whether a new screen matches the rest of the product, whether to fork or reuse a component, whether terminology lines up, or whether a feature feels like a different product was glued on. Also trigger when the user is adding a feature to an existing product and asks for a review. Produces a structured decision artifact with score, criteria, and anti-pattern matches.
