/**
 * Model cost tracking — estimates costs based on token usage and known pricing.
 * Prices are per million tokens.
 */
interface ModelPricing {
    input: number;
    output: number;
}
export declare class CostRegistry {
    private customPricing;
    /**
     * Set custom pricing for a model.
     */
    setPrice(model: string, pricing: ModelPricing): void;
    /**
     * Load custom pricing from config.
     */
    loadFromConfig(costs?: Record<string, {
        input: number;
        output: number;
    }>): void;
    /**
     * Get pricing for a model. Returns null if unknown.
     */
    getPricing(model: string): ModelPricing | null;
    /**
     * Estimate cost for a given model and token counts.
     */
    estimateCost(model: string, tokens: {
        input: number;
        output: number;
    }): number | null;
    /**
     * Format a cost value as a dollar string.
     */
    static formatCost(cost: number): string;
}
export {};
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