Spring AI Agentic Patterns (Part 5): Building Interoperable Agents with the Agent2Agent (A2A) Protocol

The Agent2Agent (A2A) Protocol is an open standard for seamless AI agent communication, enabling agents to discover capabilities, exchange messages, and coordinate workflows across platforms. The Spring AI A2A project integrates the A2A Java SDK with Spring AI through Spring Boot autoconfiguration, allowing users to expose their agents as A2A servers. The A2A Protocol is built on HTTP, SSE, and JSON-RPC standards, and it defines two roles: A2A Server agents and A2A Client agents. The protocol enables agents to collaborate across system boundaries through practical examples, such as a single-agent server and a multi-agent orchestration. The Spring AI A2A project provides a Java implementation with server-side components for processing requests and managing tasks, and client-side components for calling remote agents. To get started, users need to add the Spring AI A2A starter to their project, configure their application in application.properties, and expose their Spring AI application with tools as an A2A server. The project also provides examples of how to build interoperable agent systems, including a travel planner multi-agent system. The A2A Protocol represents a significant step toward interoperable AI agent ecosystems, and the Spring AI A2A community project provides the integration needed to participate in this ecosystem. The project welcomes community contributions and provides resources for users to get started with integrating A2A Protocol support with their Spring AI agents. The A2A Protocol has the potential to expand options for agent collaboration and composition as the ecosystem grows, and it can be used to build sophisticated multi-agent systems.