Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations at all, the description carries full burden for behavioral disclosure. It reveals no specifics about behavior: whether it actually invokes tools, just recommends them, or returns a plan. The description doesn't state side effects, whether it has rate limits, or what happens on ambiguous tasks—all unknown for an orchestration tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.