interface Usage {
    readonly contextTokens: number;
    readonly contextWindow: number;
    readonly reserveTokens: number;
}
/** @experimental Remembers unchanged threshold passes until their session usage changes. */
export declare const makeThresholdState: () => {
    clear: (sessionId: string) => void;
    isUnchanged: (sessionId: string, usage: Usage, contextRevision: string) => boolean;
    recordUnchanged: (sessionId: string, usage: Usage, contextRevision: string) => void;
};
export {};