Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. 'List' implies a read-only operation, but the description does not explicitly disclose safety characteristics, permissions, or side effects. It is minimally adequate for a simple listing tool but lacks detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.