Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false and destructiveHint=false, so the mutation profile is known, but the description adds nothing on top: no indication of what a node plugin requires to be created, whether the name must be unique, what happens on conflict, or what is returned. For a creation tool with no output schema, this leaves the behavioral picture thin.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.