After a code change (diff/fix/requirement change), decide what to regression-test: changed files → functions → features → cases traceability; outputs a ranked list. Not for: editing case files (test-case-writing), long-term strategy (test-strategy). 代码变更后判断回归哪些测试：沿改动分析链产出分级回归清单。不用于：用例增量修改、长期策略。
安装
npx skills add fishzjp/qa-skills --skill regression-testingnpx skills add fishzjp/qa-skills --skill regression-testing -a claude-code -gnpx skills add fishzjp/qa-skills --skill regression-testing -a codex -ggemini skills install https://github.com/fishzjp/qa-skills.git --path skills/regression-testinggh skill install fishzjp/qa-skills regression-testinggit clone --depth 1 https://github.com/fishzjp/qa-skills /tmp/fishzjp__qa-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/fishzjp__qa-skills/skills/regression-testing ~/.claude/skills/regression-testing # Claude Code
cp -R /tmp/fishzjp__qa-skills/skills/regression-testing ~/.agents/skills/regression-testing # Codex, Cursor, Gemini CLI, Copilot, OpenCode