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build-prototype-test-card

100 / 100 · Low risk

Fine to try.

By polar-bear-org/claude-skills (GitHub) · design · 54 stars · scanned at commit 95f0180

Writes a Prototype Test Card that sorts the beliefs behind your idea by how much rides on each and how little evidence it has, then puts one belief on a card with the task, who sees it, one observable measure and a pass line you set and date before anything is built. Use for "run build-prototype-test-card", "write a test card", "what does this prototype need to prove", "which assumption do I test first", "set the pass line before I build", "what result would make us stop", "riskiest assumption"…

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'build-prototype-test-card' ] || [ -L ~/.agents/skills/'build-prototype-test-card' ]; then echo 'A skill folder named build-prototype-test-card already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/polar-bear-org/claude-skills' "$d" && git -C "$d" checkout --quiet '95f01806ca43f6ee788d0579743e35853b695930' -- 'packs/product-builders-pack/skills/build-prototype-test-card' && mkdir -p ~/.agents/skills && cp -R "$d"/'packs/product-builders-pack/skills/build-prototype-test-card' ~/.agents/skills/'build-prototype-test-card' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'build-prototype-test-card' ~/.claude/skills/'build-prototype-test-card' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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