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A2UI (Google)·Nov 12, 2026·v1.0·open source

A2UI

A2UI is an open-source, declarative UI protocol that enables AI agents to stream rich, interactive, and native user interfaces to web, mobile, and desktop applications. By using a secure, component-based catalog system, it allows developers to maintain brand consistency and security while providing personalized, agent-generated experiences.

Generative UIAI AgentsOpen SourceUI Protocol
overview

A2UI is an open-source, declarative UI protocol that enables AI agents to stream rich, interactive, and native user interfaces to web, mobile, and desktop applications. By using a secure, component-based catalog system, it allows developers to maintain brand consistency and security while providing personalized, agent-generated experiences.

key features
  • 01Declarative JSON-based streaming protocol for agent-driven UI
  • 02Native rendering across web, mobile, and desktop frameworks
  • 03Secure component catalog system to prevent UI injection
  • 04Framework-agnostic architecture supporting React, Lit, Angular, Flutter, and more
  • 05Incremental UI updates for low-latency, real-time interactions
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