/**
 * Tool: execute_query
 * Executes arbitrary READ-ONLY SQL queries
 *
 * SECURITY: This tool enforces read-only execution through:
 * 1. Connection-level read-only mode (default_transaction_read_only=on)
 * 2. Basic SQL validation to reject obvious write operations
 * 3. Query timeout to prevent long-running queries
 *
 * WARNING: Despite these protections, users should NEVER attempt to modify data.
 */
export interface ExecuteQueryInput {
    query: string;
    maxRows?: number;
}
export interface ExecuteQueryOutput {
    columns: string[];
    rows: any[];
    rowCount: number;
    executionTimeMs: number;
    warning?: string;
}
/**
 * Executes an arbitrary read-only SQL query
 *
 * IMPORTANT: This tool is READ-ONLY. The database connection is configured with
 * default_transaction_read_only=on, preventing any data modifications.
 */
export declare function executeQueryTool(input: ExecuteQueryInput): Promise<ExecuteQueryOutput>;
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