Identifying a multiple member LLC

[Rafael Norat]

How is it that a multiple member LLC is identified as having more than one member in any court proceeding? My question stems from the protection aspect of multiple member LLCs potentially shielding the corporate vail better than single member LLCs. Would the operating agreement have to be published publicly to record for general knowledge? Otherwise someone would be able to add a member at last minute, no? Any help would be greatly appreciated.