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Agent2Agent Protocol (A2A)
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1.Java SDK A2A Spec30 usages

io.github.a2asdk » a2a-java-sdk-spec Apache

Java SDK for the Agent2Agent Protocol (A2A) - Spec
Last Release on Nov 20, 2025

2.Java SDK A2A Client29 usages

io.github.a2asdk » a2a-java-sdk-client Apache

Java SDK for the Agent2Agent Protocol (A2A) - Client
Last Release on Nov 20, 2025

3.Google ADK A2A Integration5 usages

com.google.adk » google-adk-a2a Apache

Google Agent Development Kit (ADK) for Java
Last Release on Sep 1, 2026

4.LangChain4j :: Agentic Framework :: A2A Integration5 usages

dev.langchain4j » langchain4j-agentic-a2a Apache

LangChain4j :: Agentic Framework :: A2A Integration
Last Release on Aug 15, 2026

5.AgentScope Java A2A Spring Boot Starter5 usages

io.agentscope » agentscope-a2a-spring-boot-starter Apache

Spring Boot starter for integrating AgentScope Java A2A
Last Release on Aug 9, 2026

6.AgentScope Java Extensions A2A Client5 usages

io.agentscope » agentscope-extensions-a2a-client Apache

AgentScope Extensions - Agent to call remote Agent by A2A protocol
Last Release on Aug 10, 2026

7.A2A Core4 usages

ai.koog » a2a-core Apache

Koog is a framework for quickly creating AI agents in Kotlin with minimal effort.
Last Release on Apr 10, 2026

8.AgentScope Java Extensions A2A Server4 usages

io.agentscope » agentscope-extensions-a2a-server Apache

AgentScope Extensions - Server to export Agent as A2A protocol
Last Release on Aug 10, 2026

9.Embabel A2A3 usages

com.embabel.agent » embabel-agent-a2a Apache

Embabel Agent To Agent Protocol
Last Release on Aug 25, 2026

10.Spring AI Alibaba A2A Common3 usages

com.alibaba.cloud.ai » spring-ai-alibaba-a2a-common Apache

A2A common for Spring AI Alibaba
Last Release on Sep 24, 2025