/**
 * Memory formatter — formats memory query results for injection into agent prompts.
 *
 * Groups entries by confidence tier (verified → observed → inferred) so agents
 * can weight memories by reliability. Respects a token budget to avoid context
 * window overflow.
 */
import type { MemoryQueryResult } from '../types/memory.types.js';
/**
 * Format memory query results into a markdown block for system message injection.
 *
 * Groups entries by confidence tier: VERIFIED first, then OBSERVED, then INFERRED.
 * Respects a token budget — stops adding entries once the budget (90% safety margin)
 * is reached. Stale entries are excluded entirely.
 *
 * Returns null if there are no non-stale entries to include.
 *
 * @param results - Memory query results to format
 * @param tokenBudget - Maximum tokens to use (default 2000)
 */
export declare function formatMemoryForInjection(results: MemoryQueryResult[], tokenBudget?: number): null | string;
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