/**
 * 带重试机制的异步函数包装器
 * - 4xx 客户端错误直接抛出，不重试
 * - 其他错误使用带随机抖动的指数退避重试
 */
export declare function withRetry<T>(fn: (...args: any[]) => Promise<T>, maxRetries?: number, initialDelay?: number): (...args: any[]) => Promise<T>;
/**
 * 检查字符串是否为 URL
 */
export declare function isUrl(source: string): boolean;
/**
 * 创建成功响应
 */
export declare function createSuccessResponse(data: string): {
    content: {
        type: "text";
        text: string;
    }[];
};
/**
 * 创建错误响应
 */
export declare function createErrorResponse(message: string): {
    content: {
        type: "text";
        text: string;
    }[];
    isError: boolean;
};
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