Build Generative UI Apps with A2UI & CopilotKit Agents

The article explains A2UI, Google's framework-agnostic open standard for Generative UI in which agents describe interfaces as declarative JSON data that the client renders using a trusted component catalog, and describes how CopilotKit's AG-UI-based stack connects agents such as Google ADK, LangChain, Mastra and Strands to React and Angular apps. It covers the Basic Catalog's 18 primitives, custom catalogs defined with Zod schemas, bi-directional reactive surfaces that send user input back to the agent, and setup via the ag_ui_adk package and the CopilotKit provider.