Fix a reported bug with a regression test that demonstrably fails on the original behavior and passes after the fix. Use when implementing a bug fix or checking whether a proposed fix actually addresses a reported failure. Not a general coverage audit or new-feature workflow.
Install
npx skills add Neeeophytee/finding-unknowns-skills --skill regression-proofnpx skills add Neeeophytee/finding-unknowns-skills --skill regression-proof -a claude-code -gnpx skills add Neeeophytee/finding-unknowns-skills --skill regression-proof -a codex -ggemini skills install https://github.com/Neeeophytee/finding-unknowns-skills.git --path skills/regression-proofgh skill install Neeeophytee/finding-unknowns-skills regression-proofgit clone --depth 1 https://github.com/Neeeophytee/finding-unknowns-skills /tmp/Neeeophytee__finding-unknowns-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/Neeeophytee__finding-unknowns-skills/skills/regression-proof ~/.claude/skills/regression-proof # Claude Code
cp -R /tmp/Neeeophytee__finding-unknowns-skills/skills/regression-proof ~/.agents/skills/regression-proof # Codex, Cursor, Gemini CLI, Copilot, OpenCode