import type { CompletionRequest, Message } from '../types/messages.js';
/**
 * Estimates token counts without a model-specific tokenizer, for budgets, planning, and context
 * windows.
 */
export declare class Tokenizer {
    /** Estimated tokens in a text. */
    estimateTextTokens(text: string): number;
    /** Estimated tokens in a message, including its role overhead. */
    estimateMessageTokens(message: Message): number;
    /** Estimated input tokens for a request, including messages and tool definitions. */
    estimateRequestTokens(request: CompletionRequest): number;
}