Google releases A2UI Express, swappable inference formats for generative UI

1. Google Developers BlogOfficial

   Google details A2UI and CopilotKit for building generative UI agent apps

   AIGoogle says A2UI, its framework-agnostic open standard, lets agents describe interfaces as declarative JSON that the application renders with its own components. CopilotKit's AG-UI-based stack connects A2UI to agent frameworks including Google ADK, LangChain, and AWS Strands, with React and Angular renderers plus community Vue and Slack renderers. The post shows setup with the ag_ui_adk package for ADK agents, which serves an AG-UI endpoint on FastAPI, and registering an A2UI component catalog with the CopilotKit provider.

1. Google Developers BlogOfficialPick

   Google explains how to speed up A2UI with swappable inference formats

   AIGoogle introduces A2UI Express, an inference format that the agent SDKs compile into standard A2UI messages, and says it reduces latency by up to 3x and uses up to 3x fewer tokens than Direct JSON. The post also describes controlled generation, where a decision model called Jev selects among predefined layouts, reducing latency by up to 80x for layout decisions. Express is available in the Python, TypeScript, and Dart agent SDKs.

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