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, runnable prototypes that let you and stakeholders feel the answer before committing to real implementation. ## Core Features & Use Cases - Logic Prototypes: Generate a single self-contained HTML file with free-play buttons and tabbed guided walkthroughs that drive a pure reducer, state machine, or function set through edge cases. - 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. - Capture Workflow: Fold validated decisions into real code and preserve the prototype on a throwaway branch as a primary source. - Use Case: A product manager is unsure whether an order state machine handles cancellation-after-shipping. You build a shareable HTML demo they can click through to expose the flaw before any backend code is written. ## Quick Start Ask the agent to prototype whether your state machine handles a specific edge case, or to generate three UI variants of an existing page.