Implement error-handling patterns: boundaries, toasts, one API error shape. Use when "error boundary", "error toast", or "standardize API errors". Plan-only audit → plan-error-handling. Sentry triage → debug-sentry-monitor.
Install
npx skills add kensaurus/skills --skill backend-error-handlingnpx skills add kensaurus/skills --skill backend-error-handling -a claude-code -gnpx skills add kensaurus/skills --skill backend-error-handling -a codex -ggemini skills install https://github.com/kensaurus/skills.git --path skills/backend-error-handlinggh skill install kensaurus/skills backend-error-handlinggit clone --depth 1 https://github.com/kensaurus/skills /tmp/kensaurus__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/kensaurus__skills/skills/backend-error-handling ~/.claude/skills/backend-error-handling # Claude Code
cp -R /tmp/kensaurus__skills/skills/backend-error-handling ~/.agents/skills/backend-error-handling # Codex, Cursor, Gemini CLI, Copilot, OpenCode