True or False: An international agreement must be in writing.

An international agreement does not necessarily have to be in writing to be valid. While written agreements are common and provide a clear record of the terms and commitments of the parties involved, international law recognizes that agreements can also be made verbally or through other means, such as an exchange of diplomatic notes or through conduct that implies agreement. The key factor in determining the validity of an international agreement lies in the mutual consent of the parties and their intentions, rather than the form in which the agreement is documented. Therefore, stating that it must be in writing is inaccurate.