import { TDTrinoClient } from '../client/trino';
import { AuditLogger } from '../security/audit-logger';
import { QueryValidator } from '../security/query-validator';
export interface QueryResult {
    columns: Array<{
        name: string;
        type: string;
    }>;
    rows: unknown[][];
    rowCount: number;
    truncated: boolean;
}
/**
 * MCP tool for executing read-only SQL queries
 */
export declare class QueryTool {
    private readonly client;
    private readonly auditLogger;
    private readonly queryValidator;
    constructor(client: TDTrinoClient, auditLogger: AuditLogger, queryValidator: QueryValidator);
    /**
     * Executes a read-only SQL query
     * @param sql - SQL query to execute (SELECT, SHOW, DESCRIBE only)
     * @param limit - Maximum number of rows to return (default: 40, max: 10000)
     * @returns Query results with columns, rows, and metadata
     * @throws {Error} If parameters are invalid or query fails
     */
    execute(sql: string, limit?: number): Promise<QueryResult>;
    /**
     * Injects a LIMIT clause if the query doesn't already have one
     */
    private injectLimit;
    /**
     * Checks if the query already contains a LIMIT clause
     */
    private hasExplicitLimit;
}
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