Represents a chunk of a message, which can be concatenated with other message chunks. It includes a method _merge_kwargs_dict() for merging additional keyword arguments from another BaseMessageChunk into this one. It also overrides the __add__() method to support concatenation of BaseMessageChunk instances.

Hierarchy (view full)



additional_kwargs: {
    function_call?: FunctionCall;
    tool_calls?: ToolCall[];
    [key: string]: unknown;

Additional keyword arguments

Type declaration

The content of the message.

response_metadata: Record<string, any>

Response metadata. For example: response headers, logprobs, token counts.

name?: string

The name of the message sender in a multi-user chat.



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