/**
 * Query-type classification for retrieval strategy adjustment.
 *
 * Classifies queries into types using lightweight heuristics (no LLM needed),
 * then returns scoring weight profiles that the retriever uses to adjust
 * keyword vs semantic vs recency balance.
 */
/**
 * Query types that map to different retrieval strategies.
 */
export type QueryType = 'recall' | 'synthesis' | 'recent' | 'decision';
/**
 * Scoring weights for each retrieval dimension.
 * Must sum to approximately 1.0.
 */
export interface RetrievalWeights {
    /** Weight for keyword match scoring */
    keyword: number;
    /** Weight for semantic (embedding) similarity */
    semantic: number;
    /** Weight for recency (newer messages score higher) */
    recency: number;
    /** Whether to apply MMR diversity penalty for synthesis queries */
    diversify: boolean;
    /** Candidate count multiplier (1.0 = standard, 1.5 = more, 0.5 = fewer) */
    candidateMultiplier: number;
}
/**
 * Classify a query into a retrieval type using heuristic pattern matching.
 * Falls back to 'recall' (the most common case) when no pattern matches.
 */
export declare function classifyQuery(query: string): QueryType;
/**
 * Get retrieval weights for a query type.
 */
export declare function getRetrievalWeights(queryType: QueryType): RetrievalWeights;
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