A2UI

In plain words

A2UI is an open protocol from Google that lets AI agents create user interfaces without executing code. Instead of running potentially unsafe code, agents generate declarative JSON specifications that applications render natively across platforms like Flutter, web, and mobile. The framework-agnostic approach is designed specifically for large language models to build interactive UIs securely.

written from the facts on this page · September 2026

From the sources

A2UI is an open protocol by Google enabling agents to generate rich, interactive UIs. Instead of risky code execution, agents send declarative JSON that clients render natively (Flutter/Web/Mobile). Secure, framework-agnostic, and designed for LLMs.

A2UI, a streaming protocol for Agent-Driven User Interfaces

A2UI enables AI agents to generate rich, interactive user interfaces that render natively across web, mobile, and desktop—without executing arbitrary code. A2UI is Apache 2.0 licensed, created by Google with contributions from CopilotKit and the open source community, and is in active development on GitHub . A2UI solves the following problem: how can AI agents safely send rich UIs across trust boundaries? Instead of text-only responses or risky code execution, A2UI lets agents send declarative component descriptions that clients render using their own native widgets. It's like having agents speak a universal UI language. Declarative data format, not executable code. Agents can only use…from a2ui.org

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  OpenUIMar 2026 · openui.com · ▲322

  Thesys just open-sourced their generative UI rendering engine. Interesting timing given where Google a2ui and Vercel's json-render are headed. The difference worth noting: a2ui and json-render both treat JSONL as the contract between the LLM and the renderer. Thesys is betting that's the wrong primitive. Their engine uses a code-like syntax (OpenUI Lang) instead — LLM writes it, renderer executes it. The argument is that LLMs are fundamentally better at generating code than generating structured data, so you get cleaner output and ~67% fewer tokens. The broader vision seems to be a…

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  Open protocol for interactive Agent-to-UI communication

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