What changes when AI moves from answering legal questions to helping carry out legal work? Using tax as a concrete case study, Benjamin Alarie examines the transition from AI-assisted research toward systems that support planning, implementation, and auditing. Drawing on his experience building Blue J and on Superjustice: Law in the Age of Artificial Intelligence (Oxford University Press, 2026), co-authored with Samuel I. Becher, he explores what this transition means for professional judgment, accountability, and the design of legal institutions. The central argument is that AI will transform law, but whether it produces more just outcomes depends on institutional choices—not technical capability alone.