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create_reasoning_block( reasoning: str | None = None, id: str | None = None,
reasoning
str | None
None
The reasoning text or thought summary.
id
Content block identifier.
Generated automatically if not provided.
index
int | str | None
Create a ReasoningContentBlock.
ReasoningContentBlock
The id is generated automatically if not provided, using a UUID4 format prefixed with 'lc_' to indicate it is a LangChain-generated ID.
'lc_'
Index of block in aggregate response.
Used during streaming.
