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GoogleDecember 22, 2025

A2UI

Open Source
AI Agents
Agentic AI
Infrastructure

Explore A2UI

Visit the official website to learn more and get started

### TL;DR

A2UI is an open-source specification and set of libraries developed by Google that enables agents to describe rich native interfaces in a declarative JSON format. This approach allows client applications to render these interfaces using their own components, facilitating secure and interactive user interfaces across trust boundaries without the need to send executable code.

Key Insights & Metrics

Pricing
Free
Cost structure
Version
0.8
Current release version
Hardware
N/A
Compute requirements
Category
Open Source
Licensing model
Region
United States
Primary region

Key Features

  • Declarative JSON format for UI descriptions
  • Security-focused design to prevent arbitrary code execution
  • Framework-agnostic, supporting various client applications

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