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A2A Python SDK

A2A Python SDK is an open-source Python library for building agentic applications that communicate using the Agent2Agent (A2A) Protocol. It provides client and server support, implements A2A specification 1.0 with compatibility mode for 0.3, and documents JSON-RPC, HTTP+JSON/REST, and gRPC transports.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

A2A Python SDK — OpenViST project profile in Agent Frameworks.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when implementing A2A client or server functionality in a Python agent application, particularly when the project needs a documented transport or optional integration.

Who it is for

  • Python developers building agent applications that communicate through A2A.
  • Teams integrating an A2A client or server into an application using supported HTTP, gRPC, tracing, or SQL options.

Documented uses

  • Build an A2A-compatible agent application.
  • Connect an application to A2A services using the SDK's client support.
  • Run an application as an A2A server.
  • Add documented optional HTTP-server, gRPC, tracing, encryption, or SQL-driver integrations.
Before you choose

Requirements & limits

The public repository displays an Apache-2.0 license. Installation instructions use uv or pip.

  • Requires Python 3.10 or later; uv is recommended, while pip is also documented.
  • The compatibility table lists client and server support for JSON-RPC, HTTP+JSON/REST, and gRPC under both A2A 1.0 and 0.3 compatibility mode.
  • Integrations and database drivers are optional extras, so the needed capabilities should guide package selection.
  • The README provides a migration guide for upgrading from SDK 0.3 to 1.0.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install the A2A Python SDK

Add the core SDK or a documented optional integration to a Python project.

Before you start

  • Python 3.10 or later
  • uv or pip

Steps

  1. Choose the core package or an optional extra listed in the README.

  2. Install it with the matching documented uv add or pip install command.

Expected outcome

The selected A2A SDK package or extra is added to the project.

Guide limitations

  • This covers package installation only; it does not configure or run an agent application.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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Sources checked
13 October 2026
Original website title
a2aproject/a2a-python · Official homepage title · retained in its source language
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