interface ToneScorerConfig {
    referenceTone?: string;
}
export declare function createToneScorer(config?: ToneScorerConfig): import("@mastra/core/evals").MastraScorer<"tone-scorer", import("@mastra/core/evals").ScorerRunInputForAgent, import("@mastra/core/evals").ScorerRunOutputForAgent, Record<"preprocessStepResult", {
    score: number;
    responseSentiment: number;
    referenceSentiment: number;
    difference: number;
    avgSentiment?: undefined;
    sentimentVariance?: undefined;
} | {
    score: number;
    avgSentiment: number;
    sentimentVariance: number;
    responseSentiment?: undefined;
    referenceSentiment?: undefined;
    difference?: undefined;
}> & Record<"generateScoreStepResult", number>>;
export {};
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