Talk Freely, Execute Strictly: Schema-Gated Agentic AI for Flexible and Reproducible Scientific Workflows. - Joel Strickland; Arjun Vijeta; Chris Moores; Oliwia Bodek; Bogdan Nenchev; Thomas M. Whitehead; Charles Phillips; Karl Tassenberg; Gareth John Conduit; Ben Pellegrini (CoRR, 2026)