Abstract The article explores how and why communities of practice (CoPs) of international organizations (IOs) work together effectively despite the rigid formal bureaucratic and institutional borders they inhabit. The manuscript explains how four informal mechanisms combined to enable CoPs embedded in the African Union (AU), the Economic Community of West African States (ECOWAS), and the United Nations (UN) Organization to resolve political crises in Burkina Faso, Gambia, Ghana, Guinea, Mali, and Togo between 2016 and 2022. The informal mechanisms allowed CoPs to overcome their institutional limitations, cross rigid organizational borders, and work together to resolve different political crises in the six countries. Some of the informal mechanisms were cultivated by CoPs, while others emerged organically from activities and interactions of these like-minded professionals. The informal instruments that were developed and used to resolve the crises provide a telling illustration of how CoPs create global governance norms, practices, processes, rules, and structures from below. The enabling role that informality played in the six conflict theaters suggests that paying close attention to the informal dimensions of CoPs has enormous analytical benefits.