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.

Run Claude Code, Codex, Gemini CLI, or any ACP-compatible coding agent as an A2A server. Supports signed AgentCards, bearer auth, input-required permission pauses, push notifications, OpenTelemetry tracing, and multiple backends. Apache 2.0 and published on PyPI as

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

A curated, multilingual directory of A2A AgentCards, servers, clients, official samples, community implementations, and practical guides (A2A vs MCP, TypeScript/Python getting started, sample methods, etc.). MIT licensed.

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.

Official June 2026 tutorial walking through a Contract Compliance Multi-Agent Pipeline where a Python agent and a Go agent collaborate via A2A, orchestrated with ADK's

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.

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.

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

For reporting bugs or suggesting protocol improvements.

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.

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.

A .NET Aspire demo application showcasing the Microsoft Agent Framework, MCP, A2A (via the official

The main documentation site.

Link to the Agent Card section in the official docs.

Discussion on how clients can find agent cards.