A2A Java SDK 1.2.0.Final is now available -- with authorization hardening, stream lifecycle hooks, and improved spec compliance.

A2A Java SDK 1.0.0.Final is now available -- the first GA release of the official Java SDK for the A2A Protocol.

A2A Java SDK 1.0.0.CR1 is now available with v0.3 protocol backward compatibility, Android support, unified HTTP clients, and a spec-compliant SSE parser.

A2A Java SDK 1.0.0.Beta1 is now available, aligned with the final A2A Specification 1.0.0.

A2A Java SDK 1.0.0.Alpha2 is now available with telemetry support, push notifications, and important protocol updates aligned with the A2A 1.0 specification.

This blog post announces the 1.0.0.Alpha1 release and future plans.

This blog post shows how to configure an A2A server agent to use persistent stores and event queues, in order to get it working for distributed, cloud-native environments.

This blog post shows how to secure an A2A server agent using OAuth2 bearer tokens via Keycloak and shows how to enable an A2A client to automatically obtain and pass the required token in each request.

Let's learn how to create an A2A server agent and an A2A client that can communicate using the gRPC transport.

Today, we released A2A Java SDK 0.3.0.Beta1 which adds support for the HTTP+JSON/REST transport.

Let's learn how to build a multi-agent system where agents written in different languages and with different LLM frameworks can seamlessly collaborate using A2A.

Today, we released A2A Java SDK 0.3.0.Alpha1. This makes it possible to quickly get started with Quarkus and A2A using the latest, more stable version of the A2A protocol.

Today, we released A2A Java SDK 0.2.3.Beta1. This makes it possible to quickly get started with Quarkus and A2A.