# AWS shows how to connect multi-agent systems across organizations with A2A

> Original title: Build composable, interoperable multi-agent systems with A2A on AWS

- Source: AWS Machine Learning Blog
- Published: 2026-11-12T15:42:21.000Z
- Bad Influence: https://badinfluence.news/items/k5201joxjeuh8tws4p7cc50pe
- Original: https://aws.amazon.com/blogs/machine-learning/build-composable-interoperable-multi-agent-systems-with-a2a-on-aws/

## Summary

AWS explains how a LangChain enterprise orchestrator can call a Strands Agents-based SaaS compliance agent over the A2A protocol across separate AWS accounts. Each side authenticates with its own Amazon Cognito user pool, and the two sides share no secrets. The post includes three Jupyter notebooks for deployment and an end-to-end test.

## Why it matters

The post shows how two agents built on different frameworks and separate AWS accounts authenticate each other with OAuth, which helps teams planning cross-organization agent integrations.