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ProtocolReferenceMCPA2AAGENT-PROTOCOL
a2a4j
by a2ap
Java reference implementation of the Agent2Agent protocol with server and client starters
Java
Updated Nov 24, 2025
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Overview
Implements the Agent2Agent (A2A) protocol in Java with server, client, examples, and starters. Provides turnkey components and examples for embedding A2A messaging into Spring Boot services, enabling direct agent-to-agent communication and message routing. Distinguishing features include a complete Java SDK, ready-made starters, and MCP compatibility for multi-channel transport. Agent Protocol
The Value Proposition
As agents get more autonomous and begin to communicate directly, a stable protocol implementation is essential for interoperability and reproducible evaluation. A Java reference stack lowers the barrier for JVM-based teams to participate in multi-agent networks and capture interaction logs needed for reputational signals. Until now most A2A work was in other ecosystems; having a reference Java implementation helps standardize agent-to-agent evaluation and agent track record collection. Model Context Protocol (MCP) Agent Protocol
Ideal For
Java/Spring teams building interoperable agent services who need a production-ready A2A stack and examples. Event-Driven Agent Pattern
Use Cases
- Integrate A2A messaging into Spring Boot microservices to enable direct agent delegation
- Capture agent interaction logs for downstream reputation and evaluation pipelines
- Bootstrap JVM-based agent clients and servers using provided starters and examples
Topics
a2aa2a-clienta2a-protocola2a-serveraijavallmmcpspringspringboot
Similar Tools
other a2a protocol implementationsmcp protocol libraries
Keywords
a2amulti-agent trustagent-to-agent evaluationjava