Implement reversible compatibility-safe transitions. Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and preservation proof.
Install
npx skills add JuliusBrussee/caveman --skill migrationnpx skills add JuliusBrussee/caveman --skill migration -a claude-code -gnpx skills add JuliusBrussee/caveman --skill migration -a codex -ggemini skills install https://github.com/JuliusBrussee/caveman.git --path skills/migrationgh skill install JuliusBrussee/caveman migrationgit clone --depth 1 https://github.com/JuliusBrussee/caveman /tmp/JuliusBrussee__caveman
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/JuliusBrussee__caveman/skills/migration ~/.claude/skills/migration # Claude Code
cp -R /tmp/JuliusBrussee__caveman/skills/migration ~/.agents/skills/migration # Codex, Cursor, Gemini CLI, Copilot, OpenCode