A2A Tells Agents How to Talk. It Doesn't Tell Them What Happens When Things Break.

Google's Agent-to-Agent protocol is a clean spec. Agent A sends a task to Agent B over HTTP. Agent B responds. Done. Until Agent B crashes mid-task. Or goes down for 20 minutes during a deploy. Or needs a human to approve something before it can continue. What A2A Gives You A2A defines how agents find each other (Agent Cards), how they exchange messages (Tasks), and how they stream responses (SSE). It's a communication protocol. A good one. What it doesn't define: What happens when the receiving agent crashes mid-task How to retry delivery if the first attempt fails How to enforce a timeout if the agent takes too long How to add a human approval step between agents How to track whether a task actually completed These aren't edge cases. They're the entire second half of building a production multi-agent system. The Code You End Up Writing # Sender: deliver task to Agent B with retry async def send_task_with_retry(agent_url, task, max_retries=3): for attempt in range(max_retries): try: r