Caveman encoding for SPEC.md and spec-adjacent writes. Loaded by /spec, /build, /check. Cuts tokens ~75% vs prose while staying precise. Triggers on any write to SPEC.md or when user says "caveman", "compress this", "be brief".
Install
npx skills add JuliusBrussee/cavekit --skill cavemannpx skills add JuliusBrussee/cavekit --skill caveman -a claude-code -gnpx skills add JuliusBrussee/cavekit --skill caveman -a codex -ggemini skills install https://github.com/JuliusBrussee/cavekit.git --path skills/cavemangh skill install JuliusBrussee/cavekit cavemangit clone --depth 1 https://github.com/JuliusBrussee/cavekit /tmp/JuliusBrussee__cavekit
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/JuliusBrussee__cavekit/skills/caveman ~/.claude/skills/caveman # Claude Code
cp -R /tmp/JuliusBrussee__cavekit/skills/caveman ~/.agents/skills/caveman # Codex, Cursor, Gemini CLI, Copilot, OpenCode