import { type AttachFileRequest, type AttachFileResponse } from "../shared/types.js";
export declare class AttachmentError extends Error {
    readonly status: number;
    constructor(status: number, message: string);
}
/** Validate size before allocating decoded bytes or creating any files. */
export declare function validateAttachment(request: AttachFileRequest): {
    mediaType: string;
    encoded: string;
    bytes: number;
};
/** Both first-turn and later uploads use the same containment/filename rules. */
export declare function writeAttachment(cwd: string, request: AttachFileRequest): Promise<AttachFileResponse>;
//# sourceMappingURL=attachments.d.ts.map