Diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow.
Install
npx skills add mattpocock/skills --skill diagnosing-bugsnpx skills add mattpocock/skills --skill diagnosing-bugs -a claude-code -gnpx skills add mattpocock/skills --skill diagnosing-bugs -a codex -ggemini skills install https://github.com/mattpocock/skills.git --path skills/engineering/diagnosing-bugsgh skill install mattpocock/skills diagnosing-bugsgit clone --depth 1 https://github.com/mattpocock/skills /tmp/mattpocock__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/mattpocock__skills/skills/engineering/diagnosing-bugs ~/.claude/skills/diagnosing-bugs # Claude Code
cp -R /tmp/mattpocock__skills/skills/engineering/diagnosing-bugs ~/.agents/skills/diagnosing-bugs # Codex, Cursor, Gemini CLI, Copilot, OpenCode