Sprix Sage Router: State-Aware SELF/COLLABORATE/HANDOFF Routing for A2A Agent Routing
A2A agent routing is the runtime decision of who should execute a task after the handshake: keep it with the incumbent (SELF), keep the incumbent as owner and recruit peers for uncovered requirements (COLLABORATE), or transfer ownership entirely (HANDOFF). The A2A protocol standardises discovery and transport; a router supplies the missing policy layer. That is the short answer. The rest of this guide is the part that actually decides whether the router helps or hurts: what a state-aware utility function prices, why the honest benchmark signal is wasted work rather than the utility column, and the mode mix behind those numbers — SELF rising from 20% to 42% of decisions while HANDOFF falls from 66% to 44% — which shows that checkpoint awareness mainly teaches a router to leave a task where it is. ...