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What is A2A (Agent2Agent protocol)?

Also called: Agent2Agent, agent-to-agent

A2A is an open standard that lets AI agents from different providers talk to each other and hand over tasks.

Example

A travel agent asks a hotel's agent via A2A for free rooms.

For pros

Google introduced A2A in 2025 and handed it to the Linux Foundation. Agents describe their capabilities in an “Agent Card” and exchange tasks and results. MCP connects an agent to tools and data; A2A connects agents to each other.

Related terms

Sources: a2a-protocol.org, github.com, Wikipedia · Checked on 19 October 2026

Written by AI Compare Ninja with AI assistance and edited by us. Every explanation is our own text.