/**
 * loadRecent — read-side stage that injects the N most recent stored
 * messages into scope.loaded.
 *
 * Simplest possible retrieval: "what did we say last?" — no scoring,
 * no ranking, no decay, just chronological tail. Appropriate for small
 * conversations or as the warm-tier component of a hybrid pipeline.
 *
 * Reads from scope:  `identity`
 * Writes to scope:   `loaded` (appends — does not replace)
 *
 * Why append, not replace?
 *   Pipelines typically run multiple load stages (recent + semantic +
 *   facts). Appending lets each contribute without coordination. The
 *   picker stage (Layer 3) deduplicates + ranks the combined set.
 *
 * Why `count` primary, tokens secondary?
 *   Token counting needs a tokenizer — adds a dependency. `count` is
 *   universally available and "most recent N" is the most common ask.
 *   Token-budget enforcement happens in the picker stage where it
 *   naturally composes with other signals.
 */
import type { TypedScope } from 'footprintjs';
import type { MemoryStore } from '../store/index.js';
import type { MemoryState } from './types.js';
export interface LoadRecentConfig {
    /** The store to read from. */
    readonly store: MemoryStore;
    /**
     * Maximum number of entries to return. Defaults to 20 — large enough
     * for typical chat recency, small enough to fit most context windows.
     * Stores may cap this lower; in that case you get whatever fits.
     * Zero disables this load without calling the store; existing loaded
     * entries are retained through the normal stage write.
     */
    readonly count?: number;
    /**
     * Optional tier filter. When set, only loads entries marked with one
     * of these tiers (e.g. `['hot']` for aggressive context management).
     * Omitted filter = all tiers, consistent with MemoryStore.list default.
     */
    readonly tiers?: ReadonlyArray<'hot' | 'warm' | 'cold'>;
}
/**
 * Build a stage function that loads recent entries into `scope.loaded`.
 *
 * The returned stage is async and side-effect-free on failure: if the
 * store throws, the stage re-throws (fail-loud) — callers wrap with
 * `withRetry` / `withFallback` if they want degrade-to-empty behavior.
 */
export declare function loadRecent(config: LoadRecentConfig): (scope: TypedScope<MemoryState>) => Promise<void>;