Google unveils A2UI, an open standard that lets AI agents generate dynamic user interfaces by sending a structured JSON description instead of executable code, aiming for interoperability across platforms.

A2UI is designed to be context-aware, allowing agents to render complete forms, buttons, and other UI elements within host applications as conversations unfold.

Unlike web-centric sandboxed iframes, A2UI provides a framework-agnostic protocol that relies on pre-approved components and streaming JSON to render UI securely across trust boundaries.

The project is in early public preview (v0.8) with ongoing development and an invitation for collaboration and contributions.

Core resources for v0.8 include specifications, client renderers (such as Angular and Flutter), transports, a quickstart guide, core concepts, developer guides, and a protocol reference.

Version 0.8 is in production with client libraries for Flutter, Web Components, and Angular, and collaborations with AG UI and CopilotKit to broaden support.

Key features include a declarative data format, an LLM-friendly streaming structure, framework-agnostic compatibility, and progressive rendering of UI elements.

GenUI SDK for Flutter and Google platforms like Opal and Gemini Enterprise already leverage A2UI, demonstrating real-world adoption and multi-agent collaboration.

A public A2UI Widget Builder is available via CopilotKit for hands-on experimentation.

Current client libraries cover Flutter, Web Components, and Angular, with plans to extend to additional ecosystems to create native component trees across web, mobile, and desktop.

The evolution of agent UI frameworks is framed within broader contexts like AG UI and A2A, highlighting ongoing experimentation and ecosystem expansion.

Demonstrations, such as a landscape architect demo and custom components like interactive charts and maps, showcase real-world UI generation by agents.