import type { PriorDecisionLink } from '../../../types/prior-decisions.js';
/**
 * Find prior decisions relevant to the new spec (AC1/AC2).
 *
 * Returns an empty array when:
 * - No decisions have been logged (AC4 — omit when empty)
 * - Any storage or search error occurs (best-effort, never blocks)
 *
 * @param projectId   - hashed project identifier
 * @param description - spec description + title (combined query text)
 * @param tags        - spec tags appended to the query for richer overlap
 */
export declare function runPriorDecisionsHint(projectId: string, description: string, tags: string[]): Promise<PriorDecisionLink[]>;
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