/**
 * Search Group — Auto-Mode Query Classifier
 *
 * Heuristic that inspects a query string and selects the best search
 * strategy: 'fts', 'semantic', or 'hybrid'.
 *
 * This is the core of the `mode: 'auto'` default in `search_entries`.
 */
/** Search mode types supported by search_entries */
export type SearchMode = 'auto' | 'fts' | 'semantic' | 'hybrid';
/**
 * Classify a search query into the optimal search mode.
 *
 * Rules (applied in order):
 * 1. Quoted phrases → FTS5 (exact match intent)
 * 2. 1-2 words → FTS5 (keyword match is more precise)
 * 3. Questions → Semantic (conceptual intent)
 * 4. 3+ words → Hybrid RRF (benefits from both)
 *
 * @param query - The search query string
 * @returns The recommended search mode
 */
export declare function classifyQuery(query: string): Exclude<SearchMode, 'auto'>;
/**
 * Resolve the effective search mode from user-specified mode and query.
 *
 * - Explicit modes ('fts', 'semantic', 'hybrid') are used as-is
 * - 'auto' (default) delegates to classifyQuery()
 *
 * @param mode - User-specified search mode
 * @param query - The search query string
 * @returns The resolved search mode and whether it was auto-selected
 */
export declare function resolveSearchMode(mode: SearchMode, query: string): {
    resolvedMode: Exclude<SearchMode, 'auto'>;
    isAuto: boolean;
};
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