Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure. It only states the return format (JSON) and error handling (Chinese error messages). It omits important traits like pagination limits, default ordering, read-only nature, or rate limits, which are critical for safe invocation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.