import type { CustomMessageEntry, SessionEntry } from "./session-manager";
/**
 * Volatile context is refreshed for every prompt. Only its newest copy is useful;
 * replacing older copies at a maintenance boundary preserves the audit trail
 * without repeatedly charging the model for stale workspace snapshots.
 */
export declare function pruneSupersededVolatileProjectContext(entries: readonly SessionEntry[]): {
    changed: CustomMessageEntry[];
    bytesSaved: number;
};
/** Retire superseded known singleton maintenance reminders without touching ordinary user context. */
export declare function pruneSupersededMaintenanceReminders(entries: readonly SessionEntry[]): {
    changed: CustomMessageEntry[];
    bytesSaved: number;
};