Use when starting design or review, deciding how much design a task warrants, from a throwaway script to a subsystem, unsure which skill fits, or the requirement is undecided.
Install
npx skills add yutna/functional-design-skills --skill functional-designnpx skills add yutna/functional-design-skills --skill functional-design -a claude-code -gnpx skills add yutna/functional-design-skills --skill functional-design -a codex -ggemini skills install https://github.com/yutna/functional-design-skills.git --path plugin/skills/functional-designgh skill install yutna/functional-design-skills functional-designgit clone --depth 1 https://github.com/yutna/functional-design-skills /tmp/yutna__functional-design-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/yutna__functional-design-skills/plugin/skills/functional-design ~/.claude/skills/functional-design # Claude Code
cp -R /tmp/yutna__functional-design-skills/plugin/skills/functional-design ~/.agents/skills/functional-design # Codex, Cursor, Gemini CLI, Copilot, OpenCode