FileContentBlock

Type of the content block. Used for discrimination.

Unique identifier for this content block.

Used for tracking and referencing specific blocks (e.g., during streaming).

Not to be confused with file_id, which references an external file in a storage system.

Either:

• Generated by the provider
• Generated by LangChain upon creation (UUID4 prefixed with 'lc_'))

Reference to the file in an external file storage system.

For example, a file ID from OpenAI's Files API or another cloud storage provider. This is distinct from id, which identifies the content block itself.

Index of block in aggregate response. Used during streaming.

URL of the file.

Data as a base64 string.

Provider-specific metadata. This shouldn't be used for the file data itself.