Class●Since v1.1

BaseMessageChunk

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.

class BaseMessageChunk

Bases

BaseMessage<TStructure, TRole>

Constructors

constructor

Properties

property

[MESSAGE_SYMBOL]: true

property

additional_kwargs: __type

property

content: $InferMessageContent<TStructure, TRole>

Array of content blocks that make up the message content

property

id: string

Content block identifier, which can be either

generated by the provider (e.g., a provider-specific ID)
generated by LangChain upon creation (a uuid prefixed with 'lc-')

property

lc_kwargs: SerializedFields

property

lc_namespace: string[]

A path to the module that contains the class, eg. ["langchain", "llms"] Usually should be the same as the entrypoint the class is exported from.

property

lc_serializable: boolean

property

name: string

The name of the tool being called

property

response_metadata: NonNullable<BaseMessageFields<TStructure, TRole>["response_metadata"]>

Metadata about the message

property

type: TRole

Type of the content block

property

_printableFields: Record<string, unknown>

property

[toStringTag]: any

property

contentBlocks: Standard[]

property

lc_aliases: Record<string, string>

property

lc_attributes: SerializedFields | undefined

property

lc_id: string[]

property

lc_secrets: __type | undefined

property

lc_serializable_keys: string[] | undefined

property

text: string

Methods

toDict→ StoredMessage

method

toFormattedString→ string

method

toJSON→ Serialized

method

toJSONNotImplemented→ SerializedNotImplemented

method

isInstance→ obj is BaseMessage<T, MessageType> & AIMessage<T>

Type guard to check if an object is an AIMessage. Preserves the MessageStructure type parameter when called with a typed BaseMessage. When called with a typed BaseMessage, preserves the TStructure type

method

lc_name→ string

The name of the serializable. Override to provide an alias or to preserve the serialized module name in minified environments.

Implemented as a static method to support loading logic.

deprecatedmethod

_getType→ MessageType

deprecatedmethod

getType→ MessageType