/**
 * Lightweight npm-registry version check so agents can tell users when a newer
 * obyte-mcp is published. Fail-silent, 3s timeout, one request per process,
 * opt-out via OBYTE_NO_UPDATE_CHECK (or the conventional NO_UPDATE_NOTIFIER).
 */
export interface UpdateStatus {
    current: string;
    latest: string | null;
    /** true = newer version published; false = up to date; null = check disabled or failed. */
    update_available: boolean | null;
    note?: string;
}
export declare function isUpdateCheckDisabled(env?: NodeJS.ProcessEnv): boolean;
export declare function checkForUpdate(fetchImpl?: typeof fetch, env?: NodeJS.ProcessEnv): Promise<UpdateStatus>;
/** Test hook: clears the per-process cache. */
export declare function resetUpdateCheckCache(): void;