SystemMessageChunk

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