A2A (Agent-to-Agent)
Also known as: Agent2Agent · A2A protocol
A2A (Agent-to-Agent) is a protocol for agents to discover, talk to, and delegate to other agents — even across different vendors and stacks.
- An agent publishes a “card” describing its capabilities.
- Another agent discovers it and delegates a task.
- Complements MCP: A2A is agent↔agent, MCP is agent↔tools.
The vision: an internet of interoperable agents. You don't own the agent you delegate to — you just talk to it over a standard protocol.