TL;DR: My AWS colleague Dennis Traub made the case that Domain-Driven Design’s Ubiquitous Language is now critical infrastructure for AI agents. I want to take that one layer up, into architecture. After building a stack of agent skills to run my own work, I keep landing on the same rule: a skill that works is a bounded context. One consistent vocabulary inside one boundary. The skills that break are the ones that try to know everything and end up speaking three domains’ languages at once.