a2aproject/a2a-java

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Official Java SDK for the Agent2Agent (A2A) Protocol

Stars: 490
Forks: 172
Open beginner issues: 0
Indexed issues: 46
Avg merge: 1d 6h
Merged PRs (30d): 55

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 13, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue hacktoberfest

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46 issues indexed so far

Test a multi-turn interaction with a client Open

client tests

a2aproject/a2a-java#33 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Update the server example to be able to provide the extended agent card Open

examples server

a2aproject/a2a-java#81 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Request Android Support Open

a2aproject/a2a-java#131 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Code formatter/reporter Open

enhancement good first issue hacktoberfest

a2aproject/a2a-java#139 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat] Create a sample that makes use of multiple agents written with Quarkus LangChain4j Open

sample

a2aproject/a2a-java#277 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[chore]: Add more tests for ProtoUtils Open

good first issue hacktoberfest

a2aproject/a2a-java#304 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Feat]: Callback for completed sendMessage request Open

a2aproject/a2a-java#310 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 13, 2026
[chore]: Manage as many versions as possible from Quarkus BOM Open

good first issue hacktoberfest

a2aproject/a2a-java#319 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Feat]: Implement an A2A extension for AP2 Open

extension

a2aproject/a2a-java#338 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat] [Parent Tracker Issue] Implement the spec changes needed to align with v0.4.0 Open

a2aproject/a2a-java#354 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Implement the Hello World A2A extension Open

extension

a2aproject/a2a-java#367 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
Implement the Traceability Extension Open

extension

a2aproject/a2a-java#368 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Create an example that shows how to create A2A agents with Quarkus and the AG-UI protocol Open

a2aproject/a2a-java#369 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Consider creating an A2A extension to add metadata to messages to share context remotely Open

extension

a2aproject/a2a-java#371 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Create a tutorial on how to use the A2A Java SDK for the A2A website Open

a2aproject/a2a-java#372 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Create a sample that demonstrates how to use a shared contextId across multiple tasks Open

sample

a2aproject/a2a-java#375 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
Additional Server Integrations Open

a2aproject/a2a-java#376 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Set up Kubernetes example to also run on Windows. Open

good first issue hacktoberfest

a2aproject/a2a-java#395 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Feat] Create a sample that demonstrates in-task authentication (secondary credentials) Open

a2aproject/a2a-java#410 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: A2A Client Support fallback to re-select url and transport when first choise fails. Open

a2aproject/a2a-java#445 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: ran into error code “0x80010135” when unzip the code on Windows 11 Open

a2aproject/a2a-java#464 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Clarify nullability and optionality of the spec API Open

a2aproject/a2a-java#506 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Simplification of the client API? Open

a2aproject/a2a-java#517 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Move to latest Java LTS to compile, target oldest LTS Open

a2aproject/a2a-java#518 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Implement the currency conversion agent with A2A Protocol Open

a2aproject/a2a-java#588 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: push notification is not implemented exactly according to the A2A protocol Open

a2aproject/a2a-java#952 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Service Discovery and Governance for A2A Java Implementations Open

a2aproject/a2a-java#683 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Feat]: Update Part objects Open

a2aproject/a2a-java#688 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: A2A HTTP protocol upgrade fails when using Otel auto instrumentation due Netty Open

a2aproject/a2a-java#690 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: gRPC errors do not include google.rpc.ErrorInfo Open

compatibility gRPC

a2aproject/a2a-java#731 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Bug]: a2a-java client sends message with empty task ID and context ID Open

a2aproject/a2a-java#770 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: pushnotification is not support order-preserving of update event Open

a2aproject/a2a-java#775 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Feat]: Add Android support for A2A HTTP Client and decouple JdkA2AHttpClient (v0.3.x) Open

a2aproject/a2a-java#793 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Improve SSE implemetnation for 0.3 Open

a2aproject/a2a-java#841 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: 0.3.3.Final - Agent terminates early when ADK tool returning RxJava Single hops threads Open

a2aproject/a2a-java#872 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Spring Boot server integration via Erupt — annotation-driven A2A server Open

a2aproject/a2a-java#891 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 13, 2026
How to scale a A2A production deployment to 100 A2A Server Agents each exposing a different AgentCard? Open

a2aproject/a2a-java#898 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
How does the client record the task IDs that have been sent Open

a2aproject/a2a-java#909 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
fix: handle blank push notification config id consistently across transports Open

a2aproject/a2a-java#1012 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: SDK ships no native-image reachability metadata, breaking GraalVM builds Open

a2aproject/a2a-java#1032 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
Push validation into DefaultRequestHandler Open

a2aproject/a2a-java#1093 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
ClientBuilder has no fallback to AgentCard#additionalInterfaces()/preferredTransport() (legacy 0.3 cards) when supportedInterfaces() is absent Open

a2aproject/a2a-java#1121 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: SSE client rejects any event whose data arrives on a single line over 64KB, with no way to configure the limit Open

a2aproject/a2a-java#1123 · 1 comment · 1 reaction · 1 assignee · Indexed Sep 13, 2026
[Bug]: some observability capabilities loss on A2A Open

a2aproject/a2a-java#1132 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026
[Bug]: Vert.x opt-in redirects do not support relative Location values. Open

a2aproject/a2a-java#1142 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 13, 2026
[Bug]: Documentation should provide a valid example of TaskAuthorizationProvider Open

a2aproject/a2a-java#1143 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 13, 2026

a2aproject/a2a-java

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