export type ContextProbeFailure = {
    threshold: number;
    status: number;
    statusText?: string;
    message?: string;
    responseSnippet?: string;
};
export type ContextProbeModelResult = {
    modelId: string;
    thresholds: number[];
    passed: number[];
    maxPassedTokens: number | null;
    firstFailure?: ContextProbeFailure;
};
export declare function buildTextForExactTokenCount(targetTokens: number, encoderModel?: string): string;
export declare function countTokens(text: string, encoderModel?: string): number;
export declare function probeContextForModel(modelId: string, thresholds: number[], { endpoint, apiKey, timeoutMs, fetcher, maxRetries, encoderModel }: {
    endpoint: string;
    apiKey?: string;
    timeoutMs?: number;
    fetcher?: typeof fetch;
    maxRetries?: number;
    encoderModel?: string;
}): Promise<ContextProbeModelResult>;