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)

🧩 Compatibility

This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.

Spec Version	Transport	Client	Server
`1.0`	JSON-RPC	✅	✅
`1.0`	HTTP+JSON/REST	✅	✅
`1.0`	gRPC	✅	✅
`0.3` (compat)	JSON-RPC	✅	✅
`0.3` (compat)	HTTP+JSON/REST	✅	✅
`0.3` (compat)	gRPC	✅	✅

🚀 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`
All Extras	`uv add "a2a-sdk[all]"`	`pip install "a2a-sdk[all]"`
HTTP Server	`uv add "a2a-sdk[http-server]"`	`pip install "a2a-sdk[http-server]"`
FastAPI Integration	`uv add "a2a-sdk[fastapi]"`	`pip install "a2a-sdk[fastapi]"`
gRPC Support	`uv add "a2a-sdk[grpc]"`	`pip install "a2a-sdk[grpc]"`
OpenTelemetry Tracing	`uv add "a2a-sdk[telemetry]"`	`pip install "a2a-sdk[telemetry]"`
Encryption	`uv add "a2a-sdk[encryption]"`	`pip install "a2a-sdk[encryption]"`

Database Drivers
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 1.2.1

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 1.2.1
File	Size	Uploaded
a2a_sdk-1.2.1.tar.gz	429.4 kB	Sep 30, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for a2a-sdk 1.2.1
File	Interpreter	ABI	Platform	Reset
a2a_sdk-1.2.1-py3-none-any.whl 274.3 kB Sep 30, 2026	Python 3	none	any	Details

Total release size: 703.6 kB

Release files / a2a_sdk-1.2.1.tar.gz

Download URL	a2a_sdk-1.2.1.tar.gz
Size	429.4 kB
Tags	Source
SHA-256 checksum How to use checksums	`05231ade9e05989a344414474440bf2ab04950312ded5519cf779fea1fb918d6`
BLAKE2b-256 checksum How to use checksums	`3213b00cf93d0cb46010d2ea0e3132c33212bd27e44f775c98ee84ca1ba6382f`
Upload date	Sep 30, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/a2aproject/a2a-python
Publishing commit: github.com/a2aproject/a2a-python/tree/041c17bbe8d5ced7a8f6c48761152ce01ffbfc14

Workflow

Publishing configuration: github.com/a2aproject/a2a-python/blob/041c17bbe8d5ced7a8f6c48761152ce01ffbfc14/.github/workflows/python-publish.yml
Publishing logs: github.com/a2aproject/a2a-python/actions/runs/36711111995/attempts/1

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Subject: a2a_sdk-1.2.1.tar.gz
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Release files / a2a_sdk-1.2.1-py3-none-any.whl

Download URL	a2a_sdk-1.2.1-py3-none-any.whl
Size	274.3 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`5be3ed614f0dfb8f1e13c201dc603f7e01f364613951c1d492fddd1ffc010e29`
BLAKE2b-256 checksum How to use checksums	`cd71eca113a1bf8b8896389181d0cc68692011ccf0fba7b32c5746c32a04518d`
Upload date	Sep 30, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/a2aproject/a2a-python
Publishing commit: github.com/a2aproject/a2a-python/tree/041c17bbe8d5ced7a8f6c48761152ce01ffbfc14

Workflow

Publishing configuration: github.com/a2aproject/a2a-python/blob/041c17bbe8d5ced7a8f6c48761152ce01ffbfc14/.github/workflows/python-publish.yml
Publishing logs: github.com/a2aproject/a2a-python/actions/runs/36711111995/attempts/1

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Subject: a2a_sdk-1.2.1-py3-none-any.whl
SHA-256 checksum: 5be3ed614f0dfb8f1e13c201dc603f7e01f364613951c1d492fddd1ffc010e29 Verifying attestations