import { UsageSummary } from '../models.js';
export declare class BudgetTracker {
    maxBudgetTokens: number;
    maxTurns: number;
    compactAfterTurns: number;
    constructor(maxBudgetTokens?: number, maxTurns?: number, compactAfterTurns?: number);
    addTurn(inputTokens: number, outputTokens: number): UsageSummary;
    isBudgetExceeded(usage: UsageSummary): boolean;
    isTurnLimitExceeded(currentTurns: number): boolean;
    shouldCompact(turnCount: number): boolean;
}