export interface EstimateCharactersUsage {
    charactersCount: number;
}
export interface EstimateTokenUsage {
    inputTokens: number;
    outputTokens: number;
}
export type EstimateUsage = EstimateCharactersUsage | EstimateTokenUsage;
export interface EstimatePriceResult {
    available: boolean;
    inputCost: number;
    outputCost: number;
    totalCost: number;
    currency: string;
    formatted: string;
    message?: string;
}
export interface EstimateEngineInitializeResult {
    ok: boolean;
    message?: string;
}
export interface EstimateEngine {
    name: string;
    initialize(): Promise<EstimateEngineInitializeResult>;
    estimatePrice(usage: EstimateUsage): EstimatePriceResult;
}