What problem does it solve? Designs and state models often look correct on paper but break when exercised with real cases, and teams waste effort committing to untested ideas. This Skill produces throwaway prototypes that answer a specific question before real implementation begins. ## Core Features & Use Cases - Logic Prototypes: Build a small interactive terminal app with a pure, portable state module (reducer, state machine, or function set) to test business logic and state transitions by hand. - UI Prototypes: Generate several structurally different UI variants on one route, switchable via a ?variant= URL param and a floating bottom bar with arrow-key navigation. - Branch Routing: Automatically routes the request to the right prototype shape based on whether the question is about logic/state or visual design. - Use Case: Before building a new settings page, generate three radically different layouts on the existing route, flip through them in the browser, pick a winner, then delete the losers and fold the winner into the real page. ## Quick Start Prototype three different layouts for the settings page so I can compare them in the browser.