Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, but it only states a functional outcome. It does not mention return format, pagination behavior, whether it's a read-only operation, authentication requirements, or any side effects. This leaves the agent without critical information about what invoking the tool entails.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.