Twenty-five years after the United Nations adopted Resolution 1325, the Women, Peace and Security (WPS) agenda is both a landmark in diplomacy and a study in unfulfilled promise. Its most profound achievement has been to force open a conversation about the gendered power structures that fuel conflict. But that opening is narrowing. Escalating wars, a backlash against gender justice and a collapse in funding now threaten to strip the agenda of its transformative edge. The WPS agenda remains an essential tool for women peacebuilders. Whether it survives as a force for justice depends on whether the global community backs its principles with the resources and political will to make them real. Without that, the resolution’s 25th anniversary will mark the start of its decline, not its maturity.