The officials responsible for the MWC99 tournament structure, and the primary points of contact for teams, are the Tournament Manager, a Triumvirate of three Judges, and a number of Assistant Judges.

In case of any rules or scoring dispute, the Triumvirate and Tournament Manager will discuss the issue privately. Any Judges with a conflict of interest (for example if the dispute concerns an order with which the Judge is affiliated) will be disqualified from voting; remaining Judges will vote on the question. In case of a tie, the Tournament Manager will cast a deciding vote.

The Tournament Manager and Triumvirate may designate Assistant Judges to help with rules questions and problems that may arise, especially around the deadlines for completion of the early rounds. These Assistant Judges will keep things running smoothly and help to verify that teams show up on time for scheduled matches. Assistant Judges can also answer questions and provide guidance, but their decisions will not be binding unless ratified by the Triumvirate.

The MWC99 rules are subject to change at the discretion of the Triumvirate, to address problems that may arise during the tournament. Such rules changes will not be retroactive.