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.

Open A2A 1.0 mesh for Claude Code, Codex, Cursor, Cline, Continue, and Gemini. Wraps each coding agent into a standard A2A peer with local discovery, shared inbox, JSON-RPC 2.0 + SSE transport, and optional cross-machine mTLS federation. MIT licensed.

Agent-to-agent bridge that lets Claude Code, Codex, OpenClaw, Hermes Agent, Gemini CLI, Zed, and VS Code agents talk to each other through one daemon. Translates between A2A (HTTP + SSE), ACP (stdio JSON-RPC), and MCP channels with multi-session isolation and an SQLite task log. MIT licensed.

Serve Claude Code and other ACP-compatible coding agents as A2A servers, mapping tool progress, file diffs, permission prompts, and session context onto the A2A protocol. Bridges ACP (coding-agent standard) and A2A so any ACP agent becomes a peer any A2A orchestrator can call. Apache 2.0 and published on PyPI as

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

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

Official free short course by Google Cloud, IBM Research, and DeepLearning.AI (published February 2026). Learn to make agents A2A-compliant, build A2A clients, orchestrate workflows, build multi-agent systems, and understand how A2A complements MCP.

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

A practical, up-to-date handbook covering agent systems, agentic workflows, LangGraph, MCP/A2A, context engineering, agent memory, evaluation, observability, and multi-agent architecture.

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.

36-chapter Chinese hands-on course covering the full AI Agent stack — ReAct loops, Claude Code reverse engineering, MCP/A2A protocols, RAG, DSPy, and production observability — with runnable Python files and an interview-oriented focus.

AgentCard-native durable event-subscription protocol extension for A2A v1.0. Lets agents subscribe to another agent's future events via AgentCard discovery, explicit topics, leases, cursors, acknowledgements, replay, and signed delivery. Includes JSON schemas, conformance vectors, and a Python reference runtime. MIT licensed.

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.

Open specification for finding and verifying tools, skills, and agents across the web. Announced on the

Open, vendor-neutral specification for packaging Agent Skills and MCP servers into distributable plugins with a standardized

Official August 2026 Google Developers Blog post announcing Agent Plugins 1.0.0, a vendor-neutral specification backed by Google, Amazon, Microsoft, and others for packaging Agent Skills and MCP servers into portable plugins.

Zero-trust overlay network for governed agent-to-agent communication, built on OpenZiti. Provides cryptographic identity, discovery, policy, session governance, and auditable collaboration across organizational boundaries while remaining A2A-compatible at the protocol layer. Apache 2.0.

Serverless A2A gateway reference architecture on AWS providing management, control, and data layers for enterprise agent deployments, with OAuth 2.0, SSE streaming, fine-grained access control, and Bedrock AgentCore Runtime support. MIT-0.

A demonstration of Agent-to-Agent (A2A) communication using the Mastra framework and Amazon Bedrock, featuring a hybrid Express gateway plus Mastra Dev Server architecture, workflow orchestration, real-time visualization, MCP integration, and Docker Compose deployment. MIT licensed.

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

A hands-on workshop for building a production multi-agent AI system on Amazon Bedrock AgentCore. An orchestrator agent coordinates three specialists — each built with a different framework (Strands, LangChain) and protocol (HTTP, A2A, MCP) — to diagnose, analyze, and fix data pipeline issues. Covers Runtime, Gateway, Memory, Policy, and Evaluations.

Collection of experimental and reference agent applications built on the A2A protocol and SDK, including multi-agent tourist scheduling, a network of assistants, AI-powered observability root-cause analysis, and multicluster remediation demos. Apache 2.0.

Examples and reference architectures for building autonomous agents using popular frameworks on AWS, including an end-to-end serverless multi-agent system using the A2A Protocol. MIT-0.

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

For reporting bugs or suggesting protocol improvements.

Official March 2026 v1.0.0 release marking the first stable A2A specification milestone, including release notes, breaking changes, and conformance updates.

Official May 2026 v1.0.1 patch release with HTTP binding, transcoding error, and TaskStatus specification fixes following the v1.0.0 milestone.

The main documentation site.

Link to the Agent Card section in the official docs.

Discussion on how clients can find agent cards.