awesome-a2a-libraries

<div align="center"> <h1>Awesome Agent-to-Agent (A2A) Libraries</h1> <img src="assets/banner.png" alt="Awesome A2A Banner - Abstract network or connection graphic" width="100%"> </div> [](https://awesome.re) [](https://opensource.org/licenses/MIT) [](https://github.com/nMaroulis/awesome-a2a-libraries) [](https://github.com/nMaroulis/awesome-a2a-libraries) A curated list of **Agent-to-Agent (A2A) libraries and SDKs**, organized by **programming language**. This list focuses **exclusively on code libraries** that implement or support the **Agent-to-Agent (A2A) protocol** for interoperable agent communication. ## What is A2A? **Agent-to-Agent (A2A)** is an open protocol designed to enable **secure, peer-to-peer communication and collaboration between autonomous AI agents**, regardless of framework, runtime, or vendor. By standardizing the way agents exchange tasks, messages, and results, A2A allows developers to build **interoperable, multi-agent systems** capable of complex cross-application automation. Key features of A2A include: - **Framework-agnostic:** Works across different AI agent frameworks and programming languages. - **Peer-to-peer communication:** Direct agent-to-agent messaging, with optional server-mediated routing. - **Async-first design:** Supports long-running tasks and human-in-the-loop scenarios. - **Modality-agnostic:** Handles text, files, forms, streams, and other data types. - **Opaque execution:** Agents interact without exposing internal logic or proprietary tools. - **Enterprise-ready:** Includes authentication, security, privacy, and monitoring considerations. ### Official Resources - [Announcement Blog Post](https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/) – Google's introduction to A2A. - [GitHub Repository](https://github.com/a2aproject/A2A) – Source code, spec, and official samples. - [Official Documentation](https://a2aproject.github.io/A2A) – Detailed technical reference and examples. ## Table of Contents 1. [Scope](#scope) 2. [How to Read This List](#how-to-read-this-list) 3. [Libraries by Language](#libraries-by-language) - [Python](#python) - [JavaScript / TypeScript](#javascript--typescript) - [Java](#java) - [Go](#go) - [Rust](#rust) - [C#](#c) 4. [Related Ecosystem](#related-ecosystem) 5. [Contribution Guidelines](#contribution-guidelines) 6. [License](#license) ## Scope **Included** - A2A SDKs and client libraries - A2A servers, registries, and transports - Language-native agent libraries with A2A support - Utilities directly enabling A2A communication **Excluded** - Non-A2A agent frameworks - SaaS platforms or hosted products - UI tools or prompt collections/templates For broader agent framework coverage, see *awesome-agents* or *awesome-ai-agents* lists. ## Programming Languages Currently, libraries for the following programming languages are supported: <p align="center"> <font color="#888" size="2">[ Python ]</font> <font color="#888" size="2">[ JavaScript / TypeScript ]</font> <font color="#888" size="2">[ Rust ]</font> <font color="#888" size="2">[ Java ]</font> <font color="#888" size="2">[ Go ]</font> <font color="#888" size="2">[ C# ]</font> </p> <p align="center"> <img src="https://raw.githubusercontent.com/pheralb/svgl/06a1c7f443bb702317165c5091e4a648a6bc2eda/static/library/python.svg" width="45" alt="Python" title="Python"/>  <img src="https://raw.githubusercontent.com/pheralb/svgl/06a1c7f443bb702317165c5091e4a648a6bc2eda/static/library/javascript.svg" width="45" alt="JS" />  <img src="https://raw.githubusercontent.com/pheralb/svgl/06a1c7f443bb702317165c5091e4a648a6bc2eda/static/library/rust.svg" width="45" alt="Rust" />  <img src="https://raw.githubusercontent.com/pheralb/svgl/06a1c7f443bb702317165c5091e4a648a6bc2eda/static/library/java.svg" width="45" alt="Java" />  <img src="https://go.dev/blog/go-brand/Go-Logo/SVG/Go-Logo_Blue.svg" width="45" alt="Go" />  <img src="https://raw.githubusercontent.com/pheralb/svgl/06a1c7f443bb702317165c5091e4a648a6bc2eda/static/library/csharp.svg" width="45" alt="Csharp" /> </p> ## How to Read This List Libraries are grouped **by programming language**. Each entry includes several classifications to help you quickly understand its purpose, readiness, and usability. ### Classification Rules - **Role** – what part of the A2A ecosystem the library enables: - `Client` – implements *initiator* behavior, sending tasks to other agents according to A2A. - `Server` – implements *receiver/executor* behavior, accepting tasks and returning results. - `Client + Server` – supports both initiating and handling A2A interactions. - `Agent Framework` – higher-level library including client/server behavior plus orchestration or workflow tools. - `Utility` – helps implement, test, debug, or validate A2A (e.g., schemas, validators, tooling). - **Architecture / Model** – how agents communicate: - `Peer-to-peer` – direct agent-to-agent communication. - `Hybrid` – combination of peer-to-peer and server-mediated communication. - **Readiness / Stability** – how mature and production-ready the library is: - `Experimental` – early-stage, APIs may change; mainly for testing or learning. - `Stable` – well-maintained and suitable for serious projects. - `Production-ready` – proven in production, actively maintained, enterprise-ready. - **Complexity / Learning Curve** – level of experience needed to use the library effectively: - `Beginner-friendly` – easy to install and use, well-documented. - `Intermediate` – some learning or configuration required. - `Advanced` – low-level or highly configurable, intended for experts. - **Notes** – highlight extra features, - **Optional Tags** - tags to highlight features: - ✅ Beginner-friendly - ⚡ High-performance - 🌐 Multi-agent support - 🏢 Enterprise-ready - 🧪 Experimental / research > Tip: Only include libraries that are **publicly available, actively maintained**, and relevant to **A2A** or **agent orchestration**. ## Libraries by Language ### Python - **[A2A Python SDK](https://github.com/a2aproject/a2a-python)** The official Python SDK for the Agent2Agent (A2A) Protocol, enabling building A2A‑compliant agents and servers. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Official SDK with HTTP/gRPC support, async Python support via `a2a-sdk` package. - Optional Tags: 🌐 Multi-agent support - **[Pydantic AI](https://github.com/pydantic/pydantic-ai)** A Python agent framework with native A2A support via `to_a2a()` that can expose agents as A2A servers using FastA2A. - Role: Client + Server / Agent Framework - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Built by the Pydantic team, strong type safety, FastAPI-style ergonomics, supports exposing agents as A2A servers. - Optional Tags: 🌐 Multi-agent support, ✅ Beginner-friendly - **[`cA2A`](https://github.com/a2aproject/a2a-samples)** *(CLI utility)* A simple CLI utility for interacting with A2A agents, useful for debugging or prototyping. - Role: Utility - Architecture: Peer-to-peer - Readiness: Experimental - Complexity: Beginner-friendly - Notes: Great for quick experimentation with A2A agents. - Optional Tags: 🧪 Experimental / research --- ### JavaScript / TypeScript - **[A2A JS SDK](https://github.com/a2aproject/a2a-js)** Official JavaScript/TypeScript SDK for A2A Protocol, enabling agent servers and clients in Node.js/TS projects. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Includes an Express adapter for server usage. - Optional Tags: 🌐 Multi-agent support --- ### Java - **[A2A Java SDK](https://github.com/a2aproject/a2a-java)** Official Java SDK for building A2A‑compliant agents and servers. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Supports JSON-RPC, gRPC, and REST transports. - Optional Tags: 🌐 Multi-agent support --- ### Go - **[A2A Go SDK](https://github.com/a2aproject/a2a-go)** Official Go SDK for implementing A2A servers and clients. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Examples include both server and client usage. - Optional Tags: 🌐 Multi-agent support - **[tRPC-A2A-Go](https://github.com/trpc-group/trpc-a2a-go)** *(community implementation)* Community Go implementation that follows the A2A protocol with examples and utilities. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Experimental - Complexity: Intermediate - Notes: Includes session management and auth capabilities. - Optional Tags: 🧪 Experimental / research --- ### Rust - **[a2a-rs](https://github.com/EmilLindfors/a2a-rs)** Rust implementation of the A2A protocol with examples and production-like use cases. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Experimental - Complexity: Advanced - Notes: Includes demo agents showcasing HTTP/WebSocket usage. - Optional Tags: 🧪 Experimental / research --- ### C# - **[A2A .NET SDK](https://github.com/a2aproject/a2a-dotnet)** Official .NET implementation of the A2A Protocol for C# applications. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Stable - Complexity: Intermediate - Notes: Suitable for .NET and ASP.NET Core apps. - Optional Tags: 🌐 Multi-agent support - **[a2a-dotnet](https://github.com/a2aproject/a2a-dotnet)** *(community options)* Other .NET A2A implementations focusing on interoperability. - Role: Client + Server - Architecture: Peer-to-peer - Readiness: Experimental - Complexity: Intermediate - Notes: Useful alternatives or enhancements. - Optional Tags: 🧪 Experimental / research --- ## Related Ecosystem - **[A2A Protocol Specification](https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/)** – Official protocol documentation - **[awesome-agents / awesome-ai-agents](https://github.com/e2b-dev/awesome-ai-agents)** – Broader agent framework lists - Multi-agent orchestration frameworks may integrate with A2A but are listed elsewhere ## Contribution Guidelines Contributions are welcome! Please follow these guidelines: - Only add **actively maintained** libraries - Include **links, roles, model type, and maturity** - Submit via pull requests with descriptive information See full guidelines: [CONTRIBUTING.md](CONTRIBUTING.md) ## License This list is released under the **MIT License**.