export declare function isNewer(latest: string, current: string): boolean;
/**
 * Kick off the version check. Returns immediately; on a positive result it
 * stashes a notice that the next tool response will pick up. Never throws.
 *
 * Set `UE_MCP_DISABLE_UPDATE_CHECK=1` to suppress entirely (offline use,
 * locked-down environments, tests).
 */
export declare function startVersionCheck(currentVersion: string): void;
/**
 * Returns the upgrade notice once if one is pending, then clears it.
 * Tool dispatchers call this on every response and prepend the result
 * to the response content blocks when non-null.
 */
export declare function consumeUpgradeNotice(): string | null;
/** Test hook. */
export declare function _resetForTests(): void;
/** Test hook. */
export declare function _setNoticeForTests(notice: string | null): void;