Version of AIMessage output format to store in message content.
AIMessage.content_blocks will lazily parse the contents of content into a
standard format. This flag can be used to additionally store the standard format
in message content, e.g., for serialization purposes.
Supported values:
'v0': provider-specific format in content (can lazily-parse with
content_blocks)'v1': standardized format in content (consistent with content_blocks)Partner packages (e.g.,
langchain-openai) can also use this
field to roll out new content formats in a backward-compatible way.