Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only declare readOnlyHint=false and destructiveHint=false, so the safety profile is thin. The description adds nothing about the creation semantics: whether names must be unique, whether the call is idempotent, what the config object governs, or what side effects creation has. It does not contradict the annotations, but it carries almost none of the behavioral burden.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.