export declare const FABLE_FALLBACK_MODEL_ID = "claude-opus-4-8";
export declare const FABLE_FALLBACK_TURNS = 10;
export type FableStandbyCacheAnchor = {
    fingerprint: string;
    messageIndex: number;
    messageCount: number;
    oauthAccountId: string;
};
export type FableFallbackPlan = {
    sessionId: string;
    recoveryKey: string;
    requestedModel: string;
    effectiveModel: string;
    bodyText: string;
    downgraded: boolean;
    cycle?: number;
    cacheAccountId?: string;
    standbyCacheAnchor?: FableStandbyCacheAnchor;
    requestSequence?: number;
    completed?: boolean;
};
export declare class FableFallbackManager {
    private readonly now;
    private readonly recoveries;
    private nextCycle;
    constructor(now?: () => number);
    private prune;
    plan(sessionId: string | null | undefined, bodyText: unknown): FableFallbackPlan | null;
    recoveryAccount(plan: FableFallbackPlan): string | undefined;
    bindRecoveryAccount(plan: FableFallbackPlan, oauthAccountId: string): boolean;
    activate(plan: FableFallbackPlan, cacheAccountId?: string): number;
    complete(plan: FableFallbackPlan, standbyCacheAnchor?: FableStandbyCacheAnchor): {
        counted: boolean;
        remaining: number;
    };
    remaining(plan: FableFallbackPlan): number;
}