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@a2aproject

Agent2Agent (A2A) Project

Donated to the Linux Foundation by Google

Agent2Agent (A2A) Protocol

Agent2Agent Protocol Logo

An open standard for seamless communication and interoperability between AI agents

Documentation | Specification | Discussions

The Agent2Agent (A2A) Protocol is an open standard designed to facilitate communication and interoperability between independent, potentially opaque AI agent systems. In an ecosystem where agents might be built using different frameworks, languages, or by different vendors, A2A provides a common language and interaction model, enabling agents to discover capabilities, negotiate modalities, and collaborate on complex tasks.

DeepLearning.AI Course

A2A DeepLearning.AI

Join this short course on A2A: The Agent2Agent Protocol, built in partnership with Google Cloud and IBM Research, and taught by Holt Skinner, Ivan Nardini, and Sandi Besen.

Getting Started

Project Structure

  • A2A - Core protocol specification and technical documentation
  • SDKs
  • a2a-samples - Example agents, clients, and multi-agent workflows
  • a2a-inspector - Validation tools for A2A-enabled agents
  • a2a-tck - Technology Compatibility Kit for implementation testing

Contributing

We welcome contributions of all kinds! Whether you want to fix bugs, improve documentation, or propose new protocol extensions, please see our contributing guide to get started.

Have questions? Join the discussion in our community forum.

About

The Agent2Agent (A2A) Protocol is an open source project hosted by The Linux Foundation, originally contributed by Google, and open to contributions from the entire community.

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  1. A2A A2A Public

    Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.

    Shell 25.9k 2.6k

  2. a2a-python a2a-python Public

    Official Python SDK for the Agent2Agent (A2A) Protocol

    Python 2.2k 498

  3. a2a-js a2a-js Public

    Official JavaScript SDK for the Agent2Agent (A2A) Protocol

    TypeScript 627 173

  4. a2a-java a2a-java Public

    Official Java SDK for the Agent2Agent (A2A) Protocol

    Java 497 176

  5. a2a-go a2a-go Public

    Golang SDK for A2A Protocol

    Go 470 97

  6. a2a-dotnet a2a-dotnet Public

    C#/.NET SDK for A2A Protocol

    C# 263 64

Repositories

Showing 10 of 18 repositories
  • a2a-js Public

    Official JavaScript SDK for the Agent2Agent (A2A) Protocol

    a2aproject/a2a-js's past year of commit activity
    TypeScript 627 Apache-2.0 173 24 (1 issue needs help) 51 Updated Sep 23, 2026
  • a2a-rs Public

    A2A Rust SDK

    a2aproject/a2a-rs's past year of commit activity
    Rust 82 Apache-2.0 21 19 4 Updated Sep 23, 2026
  • a2a-java Public

    Official Java SDK for the Agent2Agent (A2A) Protocol

    a2aproject/a2a-java's past year of commit activity
    Java 497 Apache-2.0 175 46 (4 issues need help) 16 Updated Sep 23, 2026
  • a2a-go Public

    Golang SDK for A2A Protocol

    a2aproject/a2a-go's past year of commit activity
    Go 470 Apache-2.0 97 9 12 Updated Sep 23, 2026
  • a2a-cli Public

    The official command-line interface for interacting with A2A (Agent2Agent) compatible agents.

    a2aproject/a2a-cli's past year of commit activity
    Go 135 Apache-2.0 12 8 3 Updated Sep 23, 2026
  • a2a-python Public

    Official Python SDK for the Agent2Agent (A2A) Protocol

    a2aproject/a2a-python's past year of commit activity
    Python 2,155 Apache-2.0 499 30 (1 issue needs help) 57 Updated Sep 23, 2026
  • a2a-itk Public

    Integration Testing Kit for A2A SDKs

    a2aproject/a2a-itk's past year of commit activity
    Python 7 Apache-2.0 10 1 4 Updated Sep 23, 2026
  • A2A Public

    Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.

    a2aproject/A2A's past year of commit activity
    Shell 25,909 Apache-2.0 2,623 199 59 Updated Sep 22, 2026
  • a2a-dotnet Public

    C#/.NET SDK for A2A Protocol

    a2aproject/a2a-dotnet's past year of commit activity
    C# 263 Apache-2.0 64 31 11 Updated Sep 22, 2026
  • a2a-inspector Public

    Validation Tools for A2A Agents

    a2aproject/a2a-inspector's past year of commit activity
    TypeScript 491 Apache-2.0 154 23 51 Updated Sep 19, 2026