# Google details A2UI and CopilotKit for building generative UI agent apps

> Original title: Build Generative UI Apps with A2UI & CopilotKit Agents

- Source: Google Developers Blog
- Published: 2026-10-29T00:00:00.000Z
- Bad Influence: https://badinfluence.news/items/tb25ksfna76vg22p4fa5b7evf
- Original: https://developers.googleblog.com/build-generative-ui-apps-with-a2ui-copilotkit-agents/

## Summary

Google 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.