# Prototype Product

> Run the cheapest real probe that can change a product decision, then kill, continue, or pivot from the observation. Use when the user wants a prototype, spike, or cheap test. A demo without a decision criterion is not this job. Do not use to register a production experiment or to polish an already accepted product.

- Skill: `sylphxai/prototype-product` (Agent Skill)
- Install (CLI): `npx skillmds@latest add sylphxai/prototype-product`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sylphxai/prototype-product/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: SylphxAI (https://skillmd.com/u/sylphxai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/sylphxai/prototype-product

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# Prototype Product

A demo without a decision criterion is not a prototype. Name the decision, the cheapest observation that can change it, and the kill / continue / pivot rule before building. Polish, coverage, and production-likeness are costs; spend them only when the cheaper probe cannot discriminate.

If the next build cannot change the decision, stop. Use `design-product-experiment` when assignment and a sealed readout are required. Use `analyze-critically` when the uncertainty is an explanation, not a missing observation.