export declare function createToolResult(success: boolean, data?: unknown, error?: string, meta?: {
    code?: string;
    retryable?: boolean;
}): unknown;
export declare function createErrorResult(error: unknown): unknown;
export declare function createListResult(items: unknown[], options?: {
    totalCount?: number;
    hasNextPage?: boolean;
    cursor?: string;
    paginationNote?: string;
}): unknown;
export declare function groupBy<T>(array: T[], key: keyof T): Record<string, number>;
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