export interface BudgetConfig {
    maxTokens: number;
    maxTurns: number;
    warnAtPercent: number;
    /** Cost per input token in USD (update when Anthropic changes pricing) */
    costPerInputToken: number;
    /** Cost per output token in USD (update when Anthropic changes pricing) */
    costPerOutputToken: number;
}
export interface BudgetCheck {
    ok: boolean;
    reason?: string;
    tokensPercent: number;
    turnsPercent: number;
    warning: boolean;
    /** True when budget is exhausted — signals the caller to perform a graceful save */
    exhausted: boolean;
}
export interface BudgetSnapshot {
    totalTokens: number;
    inputTokens: number;
    outputTokens: number;
    turns: number;
    maxTokens: number;
    maxTurns: number;
    startedAt: number;
    elapsedMs: number;
    /** Estimated cost in USD based on configured token pricing */
    estimatedCostUSD: number;
}
export declare class SessionBudget {
    private config;
    private totalInput;
    private totalOutput;
    private turnCount;
    private startedAt;
    private enabled;
    constructor(config?: Partial<BudgetConfig>, enabled?: boolean);
    record(inputTokens: number, outputTokens: number): void;
    restore(inputTokens: number, outputTokens: number, turns: number): void;
    check(): BudgetCheck;
    status(): BudgetSnapshot;
    isEnabled(): boolean;
    formatBar(width?: number): string;
    formatWarning(): string | null;
    formatSessionSummary(): string;
}
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