AI BriefingChat SDK agents can stream generative UI with json-render
·2026.11.06 09:00
Key point
The feature uses a typed component catalog to convert JSON specs into native platform cards, with updates streamed at 500 ms intervals.
Details
- Chat SDK agents can now stream generative UI using json-render, which converts a JSON spec written by the agent into a Chat SDK card.
- The system uses a typed catalog covering tables, charts, and buttons, eliminating the need for separate tools to build and maintain each message shape.
- streamCard posts the card once the root element has content and updates the message as new elements stream in, with edits sent at most once every 500 ms by default.
- toCard validates every element's props against its component schema, throwing a CardSpecError for invalid specs and providing readable issues to send back to the model for correction.
- Platform adapters degrade content that exceeds message limits, such as the Slack adapter turning a second table into a code block, though limits can be passed to reject such specs instead.
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