Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden and does communicate read-only behavior ('读') and lack of cost ('免费') while listing the fields returned. It omits details like pagination, error behavior, or output shape, but these are less critical for a simple read tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.