Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, covering safety behavior. The description adds behavioral context beyond annotations by specifying that the tool surfaces available tools, limits, and upgrade information. There is no contradiction between the description and annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.