Optional design-improvement pass for when you have spare usage to drain. Finds the shallowest modules in the code the spec touches, researches a deeper design, and proposes refactors that shrink interfaces and hide decisions — behavior held constant, tests green before and after. Proposes §I/§V/§T edits, never silent rewrites.
Install
npx skills add JuliusBrussee/cavekit --skill deepennpx skills add JuliusBrussee/cavekit --skill deepen -a claude-code -gnpx skills add JuliusBrussee/cavekit --skill deepen -a codex -ggemini skills install https://github.com/JuliusBrussee/cavekit.git --path skills/deepengh skill install JuliusBrussee/cavekit deepengit clone --depth 1 https://github.com/JuliusBrussee/cavekit /tmp/JuliusBrussee__cavekit
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/JuliusBrussee__cavekit/skills/deepen ~/.claude/skills/deepen # Claude Code
cp -R /tmp/JuliusBrussee__cavekit/skills/deepen ~/.agents/skills/deepen # Codex, Cursor, Gemini CLI, Copilot, OpenCode