Designing a new interface, module, schema or type. Naming, cohesion, parameter shape, dependency direction and testability, decided before the thing has callers.
Install
npx skills add rainmanjam/poka-yoke --skill designnpx skills add rainmanjam/poka-yoke --skill design -a claude-code -gnpx skills add rainmanjam/poka-yoke --skill design -a codex -ggemini skills install https://github.com/rainmanjam/poka-yoke.git --path benchmarks/controls/clean-code/skills/designgh skill install rainmanjam/poka-yoke designgit clone --depth 1 https://github.com/rainmanjam/poka-yoke /tmp/rainmanjam__poka-yoke
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/rainmanjam__poka-yoke/benchmarks/controls/clean-code/skills/design ~/.claude/skills/design # Claude Code
cp -R /tmp/rainmanjam__poka-yoke/benchmarks/controls/clean-code/skills/design ~/.agents/skills/design # Codex, Cursor, Gemini CLI, Copilot, OpenCode