Sets up and runs Ruzzy, Trail of Bits' coverage-guided Ruby fuzzer and the only production-ready one for the language. Covers harness structure, fuzzing pure Ruby and the native C extensions in gems, and sanitizer builds. Use when fuzzing a Ruby library or gem, testing a Ruby C extension for memory safety, or asking how to fuzz Ruby at all.
Install
npx skills add trailofbits/skills --skill ruzzynpx skills add trailofbits/skills --skill ruzzy -a claude-code -gnpx skills add trailofbits/skills --skill ruzzy -a codex -ggemini skills install https://github.com/trailofbits/skills.git --path plugins/testing-handbook-skills/skills/ruzzygh skill install trailofbits/skills ruzzygit clone --depth 1 https://github.com/trailofbits/skills /tmp/trailofbits__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/trailofbits__skills/plugins/testing-handbook-skills/skills/ruzzy ~/.claude/skills/ruzzy # Claude Code
cp -R /tmp/trailofbits__skills/plugins/testing-handbook-skills/skills/ruzzy ~/.agents/skills/ruzzy # Codex, Cursor, Gemini CLI, Copilot, OpenCode