The primary text prompt for the LLM. [18]Require Specific Output FormathasOutputParserbooleanOptionalfalseIf true, an output parser sub-node (e.g., Structured Output Parser) must be connected to the chain. [18]Chat Messagesmessages.messageValuesarrayOptional[]An array of message objects, each with type (system, ai, user) and message content. Primarily used with chat model sub-nodes. [18]Image Data Field Name (User Msg)messages.messageValues[i].imageDataFieldNamestringOptional (if messages.messageValues[i].type is user and input type is imageBinary)dataSpecifies the name of the binary field from the previous node that contains image data, when providing images as part of a user message. [18]Image URL (User Msg)messages.messageValues[i].imageUrlstringOptional (if messages.messageValues[i].type is user and input type is imageUrl)