One of the main criticisms of agonistic democracy (and of post-structuralism more generally) is that it fails to get beyond a purely negative assessment of alternative theories. The article takes up this challenge. First, it seeks to specify the core commitments of agonistic democracy, focusing on the concepts of contestation, contingency and interdependence. Second, it analyses how these commitments might be institutionalised through models of perfectionism, adversarialism and inclusivism. Third, it considers how agonistic principles can suffuse broader processes of democratic design, drawing on insights from critical institutionalism. The article argues that agonism can become more than a thought experiment or critique. An agonistic design process is possible. Such a process has five key characteristics: it is processual, collective, contextual, contestable and always provisional.