import type { FallbackHint, GraphFailureReason } from "./types.js";
export type FallbackMode = "gated" | "dual";
/**
 * Maps a GraphFailureReason to a user-facing FallbackHint.
 * The hint tells the agent which non-graph tools to fall back to and
 * whether retrying is worthwhile.
 */
export declare class GraphFallback {
    private readonly mode;
    constructor(mode?: FallbackMode);
    hint(reason: GraphFailureReason, detail?: string): FallbackHint;
}
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