Adversarial senior review of the spec before any code is written. Constructs a skeptical reviewer whose authority comes from the codebase, §R research, and live best-practice — then tries to REFUTE the spec, not rubber-stamp it. Every finding cites evidence (file:line or source); unverifiable ones are flagged. Survivors harden §V; the run ends in an explicit go / no-go gate.
Install
npx skills add JuliusBrussee/cavekit --skill reviewnpx skills add JuliusBrussee/cavekit --skill review -a claude-code -gnpx skills add JuliusBrussee/cavekit --skill review -a codex -ggemini skills install https://github.com/JuliusBrussee/cavekit.git --path skills/reviewgh skill install JuliusBrussee/cavekit reviewgit clone --depth 1 https://github.com/JuliusBrussee/cavekit /tmp/JuliusBrussee__cavekit
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/JuliusBrussee__cavekit/skills/review ~/.claude/skills/review # Claude Code
cp -R /tmp/JuliusBrussee__cavekit/skills/review ~/.agents/skills/review # Codex, Cursor, Gemini CLI, Copilot, OpenCode