Build Cross-Language Multi-Agent Team with Google’s Agent Development Kit and A2A- Google Developers Blog

This post introduces the practical application of the Agent Development Kit (ADK) and the Agent-to-Agent (A2A) protocol for building cross-language multi-agent systems. It details how to create a contract compliance pipeline with a Python agent (using Gemini for extraction) and a Go agent (for deterministic validation), connected via A2A. Key contributions include demonstrating the A2A protocol's discovery (Agent Cards) and communication (JSON-RPC 2.0 with Message Parts) mechanisms, the use of ADK's RemoteA2aAgent for abstracting remote A2A services, and the concept of shared state (ToolContext.state) for inter-agent communication. It also highlights production-ready patterns like state management for fault tolerance (MANUAL_REVIEW) and the decomposition of monolithic agents into specialized microservices.