Three-Brain Auto-Router

A single skill that routes work invisibly. Three brains, one terminal:

• Claude = builder, driver, IDE harness — stays in front of the user the whole time
• Codex (GPT-5.5) = reviewer, second brain, rescue
• Gemini 2.5 Pro = eyes, ears, long-context — handles anything Claude literally cannot see or hear

Startup self-check (run once per session, before first route)

Before the first route fires in a session, verify the tooling. If anything's missing, announce it once, fall back gracefully, and don't retry every turn.

codex --version 2>&1 | head -1   # expect: codex-cli 0.125+
gemini --version 2>&1 | head -1  # expect: 0.39+

If codex is missing → Codex routes unavailable. Tell the user: "Codex CLI not found — review/rescue routes off until installed." Continue without those routes.