import type { LanguageModelUsage } from 'ai';
export type SessionMetrics = {
    tokens: {
        promptTokens: number;
        completionTokens: number;
        totalTokens: number;
    };
    estimatedCost: number;
    requestCount: number;
};
export declare function trackUsage(sessionId: string, usage: LanguageModelUsage): void;
export declare function getSessionMetrics(sessionId: string): SessionMetrics;
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