An agentic silo is a self-contained directory structure that defines the operational boundary for an AI coding agent. The term silo is intentional: like organizational silos, it isolates context, authority, and artifacts from the outside world - preventing an agent from reasoning about, modifying, or even perceiving files beyond its boundary.
Agents given a broad filesystem root tend to over-reach: they hallucinate relevance in unrelated files, accumulate context that dilutes their working memory, or make changes outside the intended blast radius. A silo enforces locality - the agent sees exactly what it needs, nothing more.