Diagnosing failures over time: regression bisection, flaky test classification and repair, quarantine with expiry, and turning a reproduction into a permanent guard. Use when a test now fails.
Install
npx skills add simota/quality-skills --skill quality-regressionnpx skills add simota/quality-skills --skill quality-regression -a claude-code -gnpx skills add simota/quality-skills --skill quality-regression -a codex -ggemini skills install https://github.com/simota/quality-skills.git --path skills/quality-regressiongh skill install simota/quality-skills quality-regressiongit clone --depth 1 https://github.com/simota/quality-skills /tmp/simota__quality-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/simota__quality-skills/skills/quality-regression ~/.claude/skills/quality-regression # Claude Code
cp -R /tmp/simota__quality-skills/skills/quality-regression ~/.agents/skills/quality-regression # Codex, Cursor, Gemini CLI, Copilot, OpenCode