import { IContextMetric, ConversationMessage } from '../types';
/**
 * Metric for tracking token count in conversations
 */
export declare class TokenMetric implements IContextMetric {
    private tokenCounter;
    threshold: number;
    constructor(maxTokens?: number);
    measure(messages: ConversationMessage[]): number;
    /**
     * Count tokens in a text string
     */
    count(text: string): number;
}