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Google·Dec 22, 2025·v0.8·open source

A2UI

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.

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overview

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 features
  • 01Declarative JSON format for UI descriptions
  • 02Security-focused design to prevent arbitrary code execution
  • 03Framework-agnostic, supporting various client applications
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