export type LlmRetryConfig = {
    delayMs: number;
    maxMs: number;
};
export type LlmRetryDeps = {
    delayMs?: number;
    maxMs?: number;
    sleep?: (ms: number) => Promise<void>;
    now?: () => number;
    fetchFn?: typeof fetch;
    log?: (msg: string) => void;
};
export declare function resolveLlmRetryConfig(): LlmRetryConfig;
export declare function isChimphandsLlmRetryEnabled(): boolean;
export declare function isRetryableLlmFailure(status: number): boolean;
export declare function isRetryableLlmNetworkError(err: unknown): boolean;
/** Retry upstream fetch until success, non-retryable status, or deadline. */
export declare function fetchUpstreamWithRetry(url: string, init: RequestInit, deps?: LlmRetryDeps): Promise<Response>;
export type LlmRetryProxyHandle = {
    baseUrl: string;
    stop: () => Promise<void>;
};
/** Start a localhost proxy that forwards to FeatureService /v1 with retry. */
export declare function startLlmRetryProxy(upstreamLlmBase: string, deps?: LlmRetryDeps): Promise<LlmRetryProxyHandle>;