Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark the tool as read-only, idempotent, and non-destructive, and the description adds meaningful behavioral context: no API key is needed, output includes a categorized catalog or call sequence, and every listed tool is callable via tools/call. There is no contradiction with the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.