@tanstack/ai@0.61.0

Minor Changes

• #1381 a0f7c14 - Add @tanstack/ai-worldlabs with worldlabsWorld() for Marble world generation through generateWorld(). World Labs jobs return a viewer URL and splat/mesh assets. WorldGenerationResult now has optional url, worldId, operationId, and assets so job adapters can omit a live-session token.

Patch Changes

• #1469 54d39d3 - Keep Anthropic's signed thinking order when a provider-executed tool (web_search / web_fetch) runs inside the same response as thinking, and stop provider-executed calls from being classified as client tool interrupts.

  • uiMessagesToWire now splits an assistant message into ordered segments at every thinking part that follows a provider-executed tool call (the rule buildAssistantMessages already applies), instead of emitting all reasoning messages first and one anchor with the joined text and every tool call. Later anchors get ${id}-segment-${n} ids.
  • The run loop records the iteration's thinking, text and tool calls in arrival order and writes one assistant ModelMessage per segment, so the interrupt MESSAGES_SNAPSHOT and the server-side continuation history keep the order too.
  • getBoundaryActionableToolRequests and executeToolCalls skip provider-executed calls, so a run that mixes web search with a client tool no longer parks on "Client tool web_search is ready to run" interrupts.
  • A MESSAGES_SNAPSHOT and modelMessagesToUIMessages fold ${id}-segment-${n} messages back into their parent, so the UI still shows one assistant message per response.

  Without this, the turn after such a response fails with Anthropic's thinking or redacted_thinking blocks in the latest assistant message cannot be modified.

• #1428 2d047c5 - Forward summarize maxLength through OpenAI-compatible adapters using the token-limit key for their API, regardless of the summarize wrapper name. Keep explicit caller limits unchanged.

• #1471 74b5823 - Keep a failed tool call's error on the tool message chat() adds to its message history. Persisted threads now restore the call with state: 'error' instead of 'complete'.

• #1366 abb0169 - Stop a mid-stream resume from duplicating the reasoning block. A hydrated message has no stepId on its thinking part — the stored form has nowhere to keep one — so the reasoning replayed on rejoin, which is keyed by stepId, matched nothing and was appended, leaving the turn as thinking, text, thinking. updateThinkingPart now falls back to the first thinking part that has no stepId and adopts it, carrying its signature over so the provider's encrypted reasoning is not lost. Parts that already belong to another step are never adopted, so separate reasoning steps still get separate parts.

• #1427 ed87986 - Structured output now reports a response that was cut off at the output cap (finish_reason: "length") as a truncation error instead of a JSON parse error or a "no content" / "missing structured result" error. This covers chat({ outputSchema }) in native combined mode (error code max_tokens), structuredOutputStream() in openai-base and ai-openrouter (RUN_ERROR with code max_tokens), and their non-stream structuredOutput(). A truncated document used to read as a schema failure; the error now says the token limit was reached.