Reviews a product document (PRD, spec, design brief) BEFORE implementation to surface holes — undefined edge cases, missing states, policy gaps — by attacking what the document is SILENT about (things unwritten, and things written only for the happy path). Acts as a strict "sign-off manager," ruling Approve / Conditional / Reject and producing a polite, forwardable question list.
Install
npx skills add davila7/claude-code-templates --skill devilnpx skills add davila7/claude-code-templates --skill devil -a claude-code -gnpx skills add davila7/claude-code-templates --skill devil -a codex -ggemini skills install https://github.com/davila7/claude-code-templates.git --path cli-tool/components/skills/productivity/devilgh skill install davila7/claude-code-templates devilgit clone --depth 1 https://github.com/davila7/claude-code-templates /tmp/davila7__claude-code-templates
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/davila7__claude-code-templates/cli-tool/components/skills/productivity/devil ~/.claude/skills/devil # Claude Code
cp -R /tmp/davila7__claude-code-templates/cli-tool/components/skills/productivity/devil ~/.agents/skills/devil # Codex, Cursor, Gemini CLI, Copilot, OpenCode