A2A Python SDK

PyPI - Python Version

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

✨ Features

A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
Extensible: Easily add support for different communication protocols and database backends.
Asynchronous: Built on modern async Python for high performance.
Optional Integrations: Includes optional support for:
- HTTP servers (FastAPI, Starlette)
- gRPC
- OpenTelemetry for tracing
- SQL databases (PostgreSQL, MySQL, SQLite)

🚀 Getting Started

Prerequisites

Python 3.10+
uv (recommended) or pip

🔧 Installation

Install the core SDK and any desired extras using your preferred package manager.

Feature	`uv` Command	`pip` Command
Core SDK	`uv add a2a-sdk`	`pip install a2a-sdk`
HTTP Server	`uv add "a2a-sdk[http-server]"`	`pip install "a2a-sdk[http-server]"`
gRPC Support	`uv add "a2a-sdk[grpc]"`	`pip install "a2a-sdk[grpc]"`
OpenTelemetry Tracing	`uv add "a2a-sdk[telemetry]"`	`pip install "a2a-sdk[telemetry]"`

Database Support

Install the necessary drivers for your chosen SQL database.

Database	`uv` Command	`pip` Command
PostgreSQL	`uv add "a2a-sdk[postgresql]"`	`pip install "a2a-sdk[postgresql]"`
MySQL	`uv add "a2a-sdk[mysql]"`	`pip install "a2a-sdk[mysql]"`
SQLite	`uv add "a2a-sdk[sqlite]"`	`pip install "a2a-sdk[sqlite]"`
All SQL Drivers	`uv add "a2a-sdk[sql]"`	`pip install "a2a-sdk[sql]"`

Examples

Helloworld Example

Run Remote Agent

git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .

In another terminal, run the client

cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py

You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.

🌐 More Examples

You can find a variety of more detailed examples in the a2a-samples repository:

Python Examples
JavaScript Examples

🤝 Contributing

Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.

📄 License

This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.

Metadata

Release files for a2a-sdk 0.3.5

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for a2a-sdk 0.3.5
File	Size	Uploaded
a2a_sdk-0.3.5.tar.gz	222.1 kB	Sep 8, 2025	Details

Built distribution (wheel)

Table of built distributions (wheels) for a2a-sdk 0.3.5
File	Interpreter	ABI	Platform	Reset
a2a_sdk-0.3.5-py3-none-any.whl 136.9 kB Sep 8, 2025	Python 3	none	any	Details

Total release size: 359.0 kB

Release files / a2a_sdk-0.3.5.tar.gz

Download URL	a2a_sdk-0.3.5.tar.gz
Size	222.1 kB
Tags	Source
SHA-256 checksum How to use checksums	`48cf37dedeb63cf0a072512221a12ed4b3950df695c9d65eadb839a99392c3e5`
BLAKE2b-256 checksum How to use checksums	`cf0d12ebef081b096ca5fafd1ec8cc589739abba07b46ae7899c7420e599f2a6`
Upload date	Sep 8, 2025
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.7`

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Publishing platform: GitHub Actions
Publishing repository: github.com/a2aproject/a2a-python
Publishing commit: github.com/a2aproject/a2a-python/tree/ceeb4ef2b80add43ee3cf879f6521d67c1d571cd

Workflow

Publishing configuration: github.com/a2aproject/a2a-python/blob/ceeb4ef2b80add43ee3cf879f6521d67c1d571cd/.github/workflows/python-publish.yml
Publishing logs: github.com/a2aproject/a2a-python/actions/runs/17559030709/attempts/1

Artifact

Subject: a2a_sdk-0.3.5.tar.gz
SHA-256 checksum: 48cf37dedeb63cf0a072512221a12ed4b3950df695c9d65eadb839a99392c3e5 Verifying attestations

Release files / a2a_sdk-0.3.5-py3-none-any.whl

Download URL	a2a_sdk-0.3.5-py3-none-any.whl
Size	136.9 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`fd85b1e4e7be18a89b5d723e4013171510150a235275876f98de9e1ba869457e`
BLAKE2b-256 checksum How to use checksums	`4c96c33802d929b0f884cb6e509195d69914632536256d273bd7127e900d79ea`
Upload date	Sep 8, 2025
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.7`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/a2aproject/a2a-python
Publishing commit: github.com/a2aproject/a2a-python/tree/ceeb4ef2b80add43ee3cf879f6521d67c1d571cd

Workflow

Publishing configuration: github.com/a2aproject/a2a-python/blob/ceeb4ef2b80add43ee3cf879f6521d67c1d571cd/.github/workflows/python-publish.yml
Publishing logs: github.com/a2aproject/a2a-python/actions/runs/17559030709/attempts/1

Artifact

Subject: a2a_sdk-0.3.5-py3-none-any.whl
SHA-256 checksum: fd85b1e4e7be18a89b5d723e4013171510150a235275876f98de9e1ba869457e Verifying attestations