/**
 * Query error guidance — pattern-match PromQL/LogQL errors to structured hints.
 *
 * Addresses mcp-grafana #430: agents send bad PromQL blind and cannot recover
 * from cryptic errors like "parse error: unexpected end of input".
 *
 * Each guidance rule has a regex pattern and produces a structured hint with
 * cause, suggestion, and optional corrected example.
 */
export interface QueryGuidance {
    cause: string;
    suggestion: string;
    example?: string;
}
/**
 * Match a PromQL error to structured guidance for agent recovery.
 * Returns undefined if no pattern matches.
 */
export declare function getPromQLGuidance(error: string, expr: string): QueryGuidance | undefined;
/**
 * Match a LogQL error to structured guidance for agent recovery.
 * Returns undefined if no pattern matches.
 */
export declare function getLogQLGuidance(error: string, expr: string): QueryGuidance | undefined;
/**
 * Match a TraceQL error to structured guidance for agent recovery.
 * Returns undefined if no pattern matches.
 */
export declare function getTraceQLGuidance(error: string, expr: string): QueryGuidance | undefined;
/**
 * Parse Prometheus "infos" field into structured warnings.
 *
 * Prometheus returns an `infos` array on successful queries when there are
 * non-fatal issues (e.g., applying rate() to a gauge metric). The tool should
 * surface these so the agent can self-correct.
 */
export declare function parsePrometheusWarnings(infos: string[] | undefined): QueryGuidance[] | undefined;
/**
 * Generate a hint when a query returns no data (empty result set).
 * This is not an error — Prometheus returns success with empty results —
 * but the agent may not know why there's no data.
 */
export declare function getEmptyResultHint(expr: string): QueryGuidance;