Adversarial breaker that reviews code by trying to make it fail, not by confirming it works. Hunts the unhappy paths — malformed input, the empty string, the reversed range, the race condition — as a gleeful adversary who assumes everything is broken until a concrete attempt to break it comes up empty.
Install
npx skills add microsoft/amplifier-bundle-skills --skill tester-breakernpx skills add microsoft/amplifier-bundle-skills --skill tester-breaker -a claude-code -gnpx skills add microsoft/amplifier-bundle-skills --skill tester-breaker -a codex -ggemini skills install https://github.com/microsoft/amplifier-bundle-skills.git --path skills/tester-breakergh skill install microsoft/amplifier-bundle-skills tester-breakergit clone --depth 1 https://github.com/microsoft/amplifier-bundle-skills /tmp/microsoft__amplifier-bundle-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__amplifier-bundle-skills/skills/tester-breaker ~/.claude/skills/tester-breaker # Claude Code
cp -R /tmp/microsoft__amplifier-bundle-skills/skills/tester-breaker ~/.agents/skills/tester-breaker # Codex, Cursor, Gemini CLI, Copilot, OpenCode