Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide only a title, so the description must carry the behavioral burden. 'List' strongly implies a read-only operation, but the description adds no detail about return format, session requirements, pagination, or side effects. It is adequate but minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.