/**
 * A protocol item that is not a modelled message — `function_call`, `function_call_output`, `reasoning`, and anything the protocol adds later. `item_reference` is `400` (inline the item in `input` instead). Other types are forwarded as sent. Image rules still run over the outbound payload, so an `input_image` nested in `function_call_output` is refused on the same terms.
 */
export interface ResponsePassThroughItem {
    /** Item type, e.g. `function_call`, `function_call_output`, `reasoning`. `item_reference` is `400`. */
    type?: string | undefined;
    /** Accepts any additional properties */
    [key: string]: any;
}