langchain

8042b04d - fix(anthropic): clean up null `file_id` fields in citations during message formatting (#32592)

fix(anthropic): clean up null `file_id` fields in citations during message formatting (#32592) When citations are returned from streaming, they include a `file_id: null` field in their `content_block_location` structure. When these citations are passed back to the API in subsequent messages, the API rejects them with "Extra inputs are not permitted" for the `file_id` field.