A shared AI skill can contain scripts, reference files, and operational assumptions. Treat it as a software dependency, not just a reusable prompt. Convenient instructions can conceal permissions or executable behavior that do not match the business task your agent is supposed to perform. Inspect the whole package, identify its source and version, and document permitted access before letting it run on useful work. Test in a bookkeeping sandbox with fictional records. Review what it reads, changes, and reports, then treat updates as new supply decisions. Begin with reversible work and keep consequential actions behind approval. A portable skill still needs an owner, runtime evidence, and a way to disable it. Original article explainer. AI-assisted conceptual illustration and neural narration; original synthesized music. Not a human recording or customer result.