What problem does it solve? Design questions about state models, business logic, or UI layouts are hard to settle on paper. This Skill produces throwaway prototypes that let you press buttons, watch state change, or flip between UI variants so the real answer emerges before production code is written. ## Core Features & Use Cases - Logic Prototypes: Generate a single self-contained HTML file with free-play action buttons and tabbed guided walkthroughs that drive a pure reducer, state machine, or function set through edge cases, drivable by non-developers. - UI Prototypes: Render 3-5 radically different layout variants on an existing route, switchable via a ?variant= URL param and a floating bottom bar with arrow-key cycling. - Capture Workflow: Fold validated decisions into real code while committing the prototype itself to a throwaway branch as a primary source. - Use Case: A PM is unsure whether a checkout state machine handles cancel-after-payment. Use this Skill to build a shareable HTML demo where they click through the exact scenario and discover the flaw themselves. ## Quick Start Use the prototype skill to build a clickable demo that tests whether my order state machine handles cancellation after payment.