Build throwaway terminal or UI prototypes to answer design questions.
npx skills add https://github.com/J0Jng/MathModelingAgents --skill prototype-j0jng
Please help me install this Agent Skill. Skill: prototype Source: https://github.com/J0Jng/MathModelingAgents/tree/main/.claude/skills/engineering/prototype Command: npx skills add https://github.com/J0Jng/MathModelingAgents --skill prototype-j0jng
?variant= URL param and a floating bottom bar with arrow-key cycling. - Capture Workflow: Fold validated decisions into real code while preserving the prototype on a throwaway branch as a primary source. - Use Case: You are unsure whether a state machine handles a tricky transition sequence. The Skill builds a one-command terminal app where you drive the state by hand and immediately spot the illegal transition. ## Quick Start Ask the assistant to prototype whether your state machine handles a specific edge case, or to generate three different layout variants for an existing page.High-intent search queries and answers about installing and using this skill.
Build a small interactive terminal app around a pure reducer or state machine, with keyboard shortcuts that dispatch actions and re-render the full state each tick. Keep the logic module free of I/O so it can be lifted into the real codebase once validated.
Render several structurally different variants on the same route, gated by a ?variant= URL search param, with a floating bottom bar to cycle between them. Keep existing data fetching intact and only swap the rendered subtree per variant.
Use a logic prototype when the question is about business logic, state transitions, or data shape. Use a UI prototype when the question is what a page or component should look like. Ambiguous cases default to whichever branch matches the surrounding code.
No. Prototypes are throwaway by definition — skip tests, persistence, and polish beyond what makes them runnable. A prototype that needs tests has stopped being a prototype; rewrite properly when folding the validated decision into production.
The validated decision — such as a reducer or winning UI variant — is folded into the real code, while the full prototype is committed to a throwaway branch as a primary source. The main branch keeps only the validated decision.
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