import type { Driver } from "./types.js";
export interface AdvisorFallbackOptions {
    primary: Driver;
    /** Driver consulted only when the stall policy fires (typically aiDriver). */
    fallback: Driver;
    /** Consecutive zero-novelty actions before consulting fallback. Default: 5. */
    noveltyStallThreshold?: number;
    /** Consult on invariant violations. Default: true. */
    consultOnInvariantViolation?: boolean;
    /** Optional name override. */
    name?: string;
}
export interface NoveltySignal {
    /** Call after each action to report whether it produced new coverage. */
    recordNovelty(hadNovelty: boolean): void;
    /** Force the next step to consult the fallback. */
    consultNow(): void;
}
/**
 * Returns a driver and a control object the caller can use to feed
 * novelty / invariant signals back in. The crawler already tracks these
 * for the legacy advisor — wiring them here keeps the same source of
 * truth.
 */
export declare function advisorFallbackDriver(options: AdvisorFallbackOptions): {
    driver: Driver;
    signal: NoveltySignal;
};
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