Summary & Key Takeaways ​

• useChat now retains structured output across multiple turns.
• Each assistant turn carries its own typed StructuredOutputPart on its UIMessage.
• This change ensures chat history is preserved by default.
• The schema generic threads down to individual message parts.

Our Commentary ​

This is a smart, practical update. Losing context in multi-turn structured chats was a real headache, forcing developers to build their own workarounds. TanStack stepping in to handle this at the framework level is a huge win for DX. It feels like a small but mighty improvement.