LangChain released langchain-adk 0.3.14 on March 20, 2026. It's the first mainstream Python agent framework to ship native A2A support — the agent-to-agent coordination protocol that Google, Microsoft, Salesforce, and 100+ enterprises are now treating as infrastructure.
The headline from the release notes is "A2A-first integration." What that means in practice: any LangChain agent can now expose itself as an A2A server and call other A2A-compliant agents, regardless of what framework built them. Your LangChain orchestrator can delegate to a Crew.AI specialist. Your Google ADK agent can call a LangChain specialist. The framework boundary stops mattering.
Note: langchain-adk uses plain asyncio for agent orchestration — it is not built on LangGraph and does not require it. If you're currently using LangGraph, langchain-adk is an alternative path, not an integration layer.
That's the promise. Let's look at what it looks like in code.
What A2A Is (If You're Just Catching Up)
