A2A
An open standard, started by Google, that lets AI agents built by different companies discover each other and work together.
A2A, short for Agent2Agent, is a shared language for AI agents, meaning AI systems that don’t just answer questions but take actions, to talk to other agents, even ones built by a completely different company. It handles things like one agent finding out what another agent can do, and the two of them coordinating on a task together.
It is often mentioned alongside MCP, another open standard, but the two solve different problems: MCP is mostly about an agent talking to its own tools and data, while A2A is about one agent talking to another agent entirely. Without something like A2A, agents from different vendors simply couldn’t cooperate, each stuck working alone inside its own company’s walls.