Bidirectional Function Calling

Google released A2UI 1.0, the first stable version of its open generative-UI protocol, in which agents describe what to display while each app renders it with its own native components, preserving low latency and native fidelity across web, Android, iOS and MCP hosts. The release adds bidirectional function calling and accessibility/metadata extensions, shipping renderers for React, Angular, Lit, Flutter, SwiftUI and Jetpack Compose plus Python, TypeScript and Dart agent SDKs; Atlassian, Bloomberg and ByteDance are already building on it.