Three days after the Linux Foundation launched a new open standard for AI agent discovery, the company that wrote the first line of its code shipped a production system built on it — and the gap that ...

A2A (Agent-to-Agent) = A "common language" for AI agents to find each other and delegate tasks. It allows AIs from different manufacturers to cooperate. It comes as a set with the similarly named MCP.

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学完本章后，你至少应该能判断什么时候真的需要多智能体，而不是把“任务有点复杂”直接等同于“必须 multi-agent”；能分清 LangGraph 应用内多智能体编排 、 A2A 跨系统协作协议 、 MCP 外部能力接入协议 三层边界；知道 Supervisor 、 Handoff 、 Skills 分别解决什么问题，适合放在什么位置，并理解上下文传递为什么是多智能体工程里的关键设计点。