New in Generative UI: Catalogs, Surfaces and Markdown Mode

CopilotKit has released major Generative UI upgrades built on the experimental A2UI 1.0 protocol, adding a standard catalog of 70 interactive components, support for custom and overridden components, and theming to align generated interfaces with product design systems. The update introduces surfaces, allowing agents to render UI in designated areas anywhere on an application rather than only within chat, with configurable component limits and fallback content. Developers can use tool mode for streamed UI via tool calls or markdown mode for UI embedded directly in an agent’s text response, while live values and actions enable client-side updates and application functions without further model requests. The release emphasizes production concerns through selective catalog prompting to reduce token use, browser-side interaction handling, schema validation, prevention of generated code execution, and expanded debugging in the CopilotKit Inspector. Setup requires updating CopilotKit and passing the standard catalog to the provider, while existing A2UI integrations remain compatible, although the APIs may change as the protocol is finalized.

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