Stream partial tool results through the AI SDK adapter - #82
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Each PartialToolCallResult now feeds the tool's aggregator and emits a preliminary ToolOutputAvailablePart with the running snapshot. A MessageBundle snapshot (from MessageAggregator) is converted to a list[UIMessage] so the frontend gets the protocol-native shape. The SSE serializer learns to encode pydantic models via model_dump (json.dumps default=), so any aggregator snapshot or tool output that's a pydantic model now goes on the wire correctly.
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anbuzin
approved these changes
May 8, 2026
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Each PartialToolCallResult now feeds the tool's aggregator and emits a
preliminary ToolOutputAvailablePart with the running snapshot. A
MessageBundle snapshot (from MessageAggregator) is converted to a
list[UIMessage] so the frontend gets the protocol-native shape.
The SSE serializer learns to encode pydantic models via model_dump
(json.dumps default=), so any aggregator snapshot or tool output
that's a pydantic model now goes on the wire correctly.