DadgogoAI Dictionary

Dictionary entry

A2A

noun \ˌā-tə-ˈā\

also Agent2Agent protocol

TopicAgents & Tools First known use2025 Senses1
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Definition of A2A

  1. : Agent2Agent: an open protocol that lets AI agents built by different companies discover each other, communicate, and hand off tasks

    • Through A2A, the travel agent can hand the payment step to the bank's agent.
    • MCP connects agents to tools; A2A connects agents to other agents.

Origin & history

first known use2025

Announced by Google in April 2025.

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Related terms

MCP Model Context Protocol: an open standard for connecting AI applications to outside tools and… multi-agent system a setup in which several AI agents, often with different roles, work together or check each… AI agent an AI system that can pursue a goal over many steps on its own, deciding what to do next… agentic commerce shopping in which AI agents search, compare, and buy products or services on a person's…

Cite this entry

"A2A." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/a2a/. Accessed 4 Oct. 2026.

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