The emergence, proliferation, and use of new general-purpose technologies can often produce significant political, redistributive, normative and legal effects on the world. Artificial intelligence (AI) has been identified as one such transformative technology. Many of its impacts may require global governance responses. However, what are the direct and indirect effects of AI technologies on the viability, form, or functioning of the international legal order itself? What, if any, are the prospects, peril or promise of AI-driven legal automation at the international level? This paper draws on an ‘AI Governance Disruption’ framework to understanding AI’s impacts on the global governance architecture. Focusing particularly on the potential for legal automation at the international law level, it explores three potential pathways of such ‘legal displacement’: (1) the automation of rule creation and arbitration; (2) the automation of monitoring & enforcement; or (3) the ‘replacement’ of international law with new architectural modes of (international) behaviour control. It then focuses on the effects of these trends on the architecture of international law. It distinguishes 10 different roles that AI applications could play, with distinct effects on the international legal order. That is, AI systems can serve as (1) legal ‘canary in the coal mine’, highlighting the need for greater cross-regime harmonization. However, it can also serve as (2) tough knot or (3) generator of regime fault lines. Under even modest scenarios of legal automation, AI systems may serve variably as a (4) shield, (5) patch, (6) cure, or (7) accelerator of international legal fragmentation. Finally, AI tools may serve as (8) differential enabler; (9) driver of value shifts, or (10) asymmetric weapon, potentially contributing to trends of contestation or erosion in the international legal order. The paper concludes with a brief review of the ways in which international lawyers or regime scholars might approach the risks and opportunities of increasing automation in international law, in order to leverage these trends and tools towards improved efficacy, resilience, and legitimacy of global governance.