This paper examines strategies for safeguarding a development-oriented package of flexibilities and concessions within the ongoing World Trade Organization (WTO) negotiations on trade in services (TiSA/GATS). Drawing on recent negotiating texts, member-state submissions, and secondary literature, we identify the principal threats to development-friendly provisions in the areas of Mode 4 labor mobility, domestic regulation disciplines, and special and differential treatment (S&DT). We then propose a three-tier “defensive architecture” that combines: (1) coalition-building among low and lower-middle-income countries to enlarge bargaining leverage; (2) legal-text engineering anchoring development objectives in enforceable treaty language and safeguard clauses; and (3) issue-linkage strategies that tie services outcomes to parallel negotiations on agriculture, intellectual property, and dispute-settlement reform.

Using game-theoretic simulations calibrated to 2022–2024 negotiating positions, we demonstrate that this architecture raises the probability of retaining a meaningful development package from 35% under status-quo tactics to 71%. The paper concludes with concrete recommendations for negotiators and civil-society coalitions to operationalize these insights before the 13th Ministerial Conference.