BaseMessage

Array of content blocks that make up the message content

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-')

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.

The name of the tool being called

Metadata about the message

Type of the content block

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

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.