Invoke when the user wants to rapidly prototype a mechanic, test a proof of concept, run hypothesis-driven development, or validate a game idea before full production. Triggers on: "prototype", "proof of concept", "test this mechanic", "validate idea", "rapid prototype", "bake-off". Do NOT invoke for starting a full project (use game-start) or brainstorming concepts (use game-brainstorm).
Install
npx skills add AlterLab-IEU/AlterLab_GameForge --skill game-prototypenpx skills add AlterLab-IEU/AlterLab_GameForge --skill game-prototype -a claude-code -gnpx skills add AlterLab-IEU/AlterLab_GameForge --skill game-prototype -a codex -ggemini skills install https://github.com/AlterLab-IEU/AlterLab_GameForge.git --path skills/workflows/game-prototypegh skill install AlterLab-IEU/AlterLab_GameForge game-prototypegit clone --depth 1 https://github.com/AlterLab-IEU/AlterLab_GameForge /tmp/AlterLab-IEU__AlterLab_GameForge
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/AlterLab-IEU__AlterLab_GameForge/skills/workflows/game-prototype ~/.claude/skills/game-prototype # Claude Code
cp -R /tmp/AlterLab-IEU__AlterLab_GameForge/skills/workflows/game-prototype ~/.agents/skills/game-prototype # Codex, Cursor, Gemini CLI, Copilot, OpenCode