A2A protocol using LangChain and LangGraph

Product Help LangGraph
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Hello everyone! I have a quick question:
Is it possible to implement the A2A (Agent2Agent) protocol using LangChain and LangGraph?

I’ve tried searching online but couldn’t find sufficient resources or examples on this. If anyone has experience or insights on this, I’d greatly appreciate your help. Thanks in advance!

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Yes, it’s possible to implement an A2A protocol using LangChain and LangGraph, but there’s no official A2A framework or module built in. It means this is manually wiring up multiple agents in a LangGraph workflow. Each “agent” would be represented as a node with its own logic (LLM, tools, memory, etc.).

You’ll need to:

  • Define a shared state that includes message queues or routing info.
  • Use conditional edges to decide which agent receives what and when.
  • Ensure message passing and persistence is handled using LangGraph’s built-in state management.

This works for basic interaction patterns, but if you’re expecting true A2A features like trust negotiation, protocol compliance, or decentralized reasoning, you’d need to build that yourself. LangGraph doesn’t abstract those out of the box.

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Thank you very much!