A2A

Why we included this project

When agents built on different frameworks need to talk to each other, A2A gives them a shared way to do it. The protocol lets agents advertise what they can do, agree on how to interact, and collaborate on long-running tasks without exposing their internal memory or tools. It ships as a specification with reference SDKs in Python, Go, JS, Java, .NET, and Rust rather than a single runtime, so you adopt it to make your own agents interoperable with others. The JSON-RPC-based contract and agent-card discovery model are concrete enough to borrow when you design your own orchestration layer, and teams mixing Google ADK, LangGraph, and similar stacks will find it a useful common ground. It sits alongside MCP, which covers agent-to-tool calls, while A2A handles agent-to-agent collaboration.