import { type LLMTask, type TokenUsageRecord } from '@cortex/core';
export declare function estimateCost(model: string, inputTokens: number, outputTokens: number, provider?: string): number;
export type PersistFn = (record: TokenUsageRecord) => void;
export declare class TokenTracker {
    private records;
    private monthlyBudgetUsd;
    private warningThresholds;
    private warningsFired;
    private persistFn?;
    private hydratedSpendUsd;
    constructor(monthlyBudgetUsd?: number, warningThresholds?: number[]);
    /** Set a callback to persist each record (e.g. to SQLite) */
    setPersist(fn: PersistFn): void;
    /**
     * Hydrate tracker with spend already recorded in SQLite.
     * This ensures budget enforcement works across separate CLI processes.
     */
    hydrateSpend(currentMonthSpendUsd: number): void;
    record(requestId: string, task: LLMTask, provider: string, model: string, inputTokens: number, outputTokens: number, latencyMs: number): TokenUsageRecord;
    private trimOldRecords;
    private checkBudget;
    getCurrentMonthSpend(): number;
    isBudgetExhausted(): boolean;
    getBudgetRemaining(): number;
    getRecords(): TokenUsageRecord[];
    getSummary(): {
        totalCostUsd: number;
        totalInputTokens: number;
        totalOutputTokens: number;
        requestCount: number;
        costByTask: Record<string, number>;
        costByProvider: Record<string, number>;
    };
}
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