export interface AttachmentMeta {
    url: string;
    name: string;
    contentType: string;
    size: number;
}
export interface AttachmentLimits {
    maxFileBytes: number;
    maxTotalBytes: number;
}
export type AttachmentRejectionReason = 'file-too-large' | 'total-too-large';
export interface RejectedAttachment {
    attachment: AttachmentMeta;
    reason: AttachmentRejectionReason;
    limitBytes: number;
}
export interface AttachmentSelection {
    accepted: AttachmentMeta[];
    rejected: RejectedAttachment[];
    totalAcceptedBytes: number;
}
export declare function selectAttachmentsWithinLimits(attachments: AttachmentMeta[], limits: AttachmentLimits): AttachmentSelection;
export declare function buildAttachmentOnlyPrompt(attachmentCount: number): string;