This article traces how Kosovo came to agree to the Rambouillet accords, with the aim of exploring the nexus between diplomatic representation and international agency. It demonstrates that, in the world of diplomacy, entities like ’Kosovo’ can act only when they are carefully staged. Thus far, however, the academic discipline of International Relations (IR) has largely failed to acknowledge the role of diplomacy in the constitution of agency. Therefore, to clarify what is at stake in the theoretical debate, I begin with a systematic discussion of how IR has conceived of diplomatic representation. Taking cue from Bruno Latour’s and Lisa Disch’s writings on political representation, I then suggest an alternative understanding of diplomacy that takes its performative character seriously. Equipped with this conceptual toolkit, I subsequently turn to the story of Kosovo’s representation at the Rambouillet conference held in 1999. Tracing how Kosovo Albanians and their international supporters staged Kosovo’s diplomatic performance, and how the Yugoslav/Serbian delegation tried to undermine it, I demonstrate that diplomatic representation can indeed generate agency. I also identify three factors that influence whether or not a diplomatic performance succeeds in making those who are represented act: recognition by other international actors, practical competence, and the alignment of the represented.