Use when a function throws and callers cannot tell, when exceptions cross module boundaries, or when validation must report every problem.
Install
npx skills add yutna/functional-design-skills --skill functional-handling-errors-with-resultsnpx skills add yutna/functional-design-skills --skill functional-handling-errors-with-results -a claude-code -gnpx skills add yutna/functional-design-skills --skill functional-handling-errors-with-results -a codex -ggemini skills install https://github.com/yutna/functional-design-skills.git --path plugin/skills/functional-handling-errors-with-resultsgh skill install yutna/functional-design-skills functional-handling-errors-with-resultsgit 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-handling-errors-with-results ~/.claude/skills/functional-handling-errors-with-results # Claude Code
cp -R /tmp/yutna__functional-design-skills/plugin/skills/functional-handling-errors-with-results ~/.agents/skills/functional-handling-errors-with-results # Codex, Cursor, Gemini CLI, Copilot, OpenCode