Decide whether a job should be split across several parallel agents or sub-agents, or done inline in one session — using independence, size, review cost and file overlap as the tests.
Install
npx skills add gaurav8936/oneroof --skill fan-out-or-notnpx skills add gaurav8936/oneroof --skill fan-out-or-not -a claude-code -gnpx skills add gaurav8936/oneroof --skill fan-out-or-not -a codex -ggemini skills install https://github.com/gaurav8936/oneroof.git --path agentic_engineering/skills/fleet/fan-out-or-notgh skill install gaurav8936/oneroof fan-out-or-notgit clone --depth 1 https://github.com/gaurav8936/oneroof /tmp/gaurav8936__oneroof
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/gaurav8936__oneroof/agentic_engineering/skills/fleet/fan-out-or-not ~/.claude/skills/fan-out-or-not # Claude Code
cp -R /tmp/gaurav8936__oneroof/agentic_engineering/skills/fleet/fan-out-or-not ~/.agents/skills/fan-out-or-not # Codex, Cursor, Gemini CLI, Copilot, OpenCode