/** Default per-file size cap when the attachment store declares none (20 MiB). */
export declare const DEFAULT_MAX_ATTACHMENT_BYTES: number;
/** Default allowlist: what multimodal model providers commonly accept as native image/file parts. */
export declare const DEFAULT_ALLOWED_ATTACHMENT_CONTENT_TYPES: readonly string[];
/** The size cap and content types an upload is held to. */
export interface AttachmentLimits {
    maxBytes: number;
    allowedContentTypes: readonly string[];
}
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