Compose harnesses from other harnesses — includes, delegates, profiles, focuses and fork. Use when someone has one working harness and wants to reuse parts of it, share it, or vary it per situation rather than copying folders around.
Install
npx skills add eyelock/ynh --skill ynh-composenpx skills add eyelock/ynh --skill ynh-compose -a claude-code -gnpx skills add eyelock/ynh --skill ynh-compose -a codex -ggemini skills install https://github.com/eyelock/ynh.git --path skills/ynh-composegh skill install eyelock/ynh ynh-composegit clone --depth 1 https://github.com/eyelock/ynh /tmp/eyelock__ynh
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/eyelock__ynh/skills/ynh-compose ~/.claude/skills/ynh-compose # Claude Code
cp -R /tmp/eyelock__ynh/skills/ynh-compose ~/.agents/skills/ynh-compose # Codex, Cursor, Gemini CLI, Copilot, OpenCode