/**
 * Default relevance floor for memory search (#4129).
 *
 * The bundled 384-dim embedding model scores a correct paraphrase match at
 * roughly 0.25-0.5 and unrelated text at 0.0-0.15, so the old 0.3 floor sent
 * back an empty list for natural-language queries whose right answer was
 * clearly the best match (0.28 in the report). 0.2 sits between the two
 * populations. An explicit `threshold` always wins, including 0.
 *
 * #2558 constraint stays: the fused recall score of a full-coverage exact
 * keyword hit with semantic cosine <= 0 tops out at 0.40, so this must stay
 * well below 0.4.
 */
export declare const DEFAULT_SEARCH_THRESHOLD = 0.2;
/** How many below-threshold matches an empty default search reports as hints. */
export declare const NEAR_MISS_LIMIT = 3;
interface NearMissSearch {
    (req: {
        query: string;
        namespace?: string;
        limit?: number;
        threshold?: number;
        provenanceFilter?: string[];
        dbPath?: string;
    }): Promise<{
        success: boolean;
        results?: Array<{
            key: string;
            namespace: string;
            score: number;
        }>;
    }>;
}
/**
 * When a search that used the DEFAULT threshold returns nothing, say what was
 * close instead of leaving the caller to assume the store has no answer
 * (#4129). One extra, cheap query at threshold 0; never throws; absent when
 * nothing at all matched.
 */
export declare function nearMisses(search: NearMissSearch, req: {
    query: string;
    namespace?: string;
    provenanceFilter?: string[];
    dbPath?: string;
}): Promise<{
    nearMisses: Array<{
        key: string;
        namespace: string;
        similarity: number;
    }>;
    hint: string;
} | undefined>;
export {};
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