A2A Protocol — in 60 seconds

AI agents can't talk to each other. Google just fixed that. A2A is the protocol that lets agents find each other, delegate work, and return results without sharing memory. Built on JSON-RPC 2.0 with agent cards for discovery, three roles. The client asks a question, the orchestrator plans the work, then calls a remote agent over A2A. The remote agent does the work, streams results back. That's it. Most people confuse A2A with MCP. They're different. MCP is how an agent uses a tool. A2A is how agents talk to other agents. MCP with A2A, you can finally build real multi-agent systems. One orchestrator fans out to specialist agents. Tasks can run for hours. Every call is OAuth secured. Open standard, open source, production ready.