Sovereign rights cannot, and should never be, surrendered or diminished—much less through a secret verbal agreement made by those authorized to represent the Philippines in foreign relations. This Article examines the concept of a “gentlemen’s agreement” from the perspective of international law and Philippine municipal law. The analysis will then be juxtaposed with the extent of the treaty-making power of the President and his alter egos to bind the Philippines in such agreements. Ultimately, this Article proposes constitutional reforms to limit the otherwise untrammeled authority of the President as the Chief Architect of Philippine foreign policy.