Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. 'List' clearly implies a read-only operation, and no side effects are suggested. Still, it does not explicitly state that it is a read-only action or disclose any other behaviors like pagination or ordering, leaving some ambiguity about edge cases.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.