awesome-a2a

Java client with streaming listener

Command-line interface for interacting with A2A agents

Full A2A server + client implemented in Go

Echo and Calculator server examples

TS SDK + CLI, builds shared code for front- and backend

Dart/Flutter SDK for the A2A protocol, modelled after the official

Scalable serverless agent registry for A2A protocol AgentCards with semantic search (Amazon Bedrock, S3 Vectors), Python SDK, and React Web UI.

Automated compliance test kit + security audit for A2A endpoints (operator-side companion to the official

UI components for editing, viewing, and testing A2A agent cards and interactions, with installable packages and self-hosted local or Docker usage.

Runtime governance middleware for A2A agents in Go. Plugs into the official

Bridge server connecting MCP-compatible AI assistants (like Claude) with A2A agents, enabling seamless cross-protocol discovery, registration, and task management. Supports stdio, streamable-http, and SSE transports.

A tutorial on how to use Model Context Protocol by Anthropic and Agent2Agent Protocol by Google.

Community-driven, open-source documentation site for the A2A protocol. Built with React/TypeScript, supports English, Chinese, and Japanese. (

A code-driven deep dive by Guillaume Laforge (Groovy creator, Google Developer Advocate) exploring the agent protocols and Java frameworks essential for LLM-based agents — practical walkthroughs and demos covering MCP, A2A, ACP, ADK, Arc, Quarkus, and LangChain4j, with a focus on interoperability. Apache 2.0.

Academic paper surveying existing LLM agent communication protocols (including the category A2A falls into), classifying them, analyzing performance, and discussing future challenges.

Links to docs, spec, samples in the official repo's README.

An official AWS course for building AI agents with the Strands framework, covering LLM integration via Amazon Bedrock/Anthropic, AWS service connections, tool implementation with MCP/A2A protocols, and agent evaluation using LangFuse/RAGAS. MIT-0 licensed.

For general questions, ideas, and community discussions about the A2A protocol.

For reporting bugs or suggesting protocol improvements.

The main documentation site.

Source code for the spec, docs, and official samples.

Announcement blog post explaining the motivation and partners.

Link to the Agent Card section in the official docs.

Discussion on how clients can find agent cards.

Discussion on security, auth, privacy aspects.

The raw JSON schema definition for A2A structures.

Link to the principles section in the official docs.

Mailbox-native open protocol and SDKs (Go, Node.js, Python) for asynchronous agent-to-agent collaboration over email/SMTP and JMAP. Complements real-time A2A with durable, store-and-forward messaging and universal addressing.

Formal verification DSL for AI agent protocols using multiparty session types. Complementary to A2A: verify message sequence correctness at spec time..

Complementary protocol focused on providing tools/context

Official repository containing code samples and demos which use the Agent2Agent (A2A) Protocol.

Link to the video embedded in the official repository's README.

Demonstrates the orchestrator agent interacting with multiple remote agents, rendering text, images, and forms.