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A2UI - Agent-to-User Interface Protocol

A2UI is an open-source protocol from Google that enables AI agents to generate rich, interactive user interfaces through declarative JSON rather than executable code. It solves the critical challenge of safely transmitting UI across trust boundaries in multi-agent systems - agents describe UI intent using a flat list of pre-approved components, and clients render them natively across web, mobile, and desktop. The format is optimized for LLM generation with streaming support, incremental updates, and framework-agnostic rendering.

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