Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It includes the cost per call, which is a behavioral trait, and shows an example call. It does not explicitly state that it is read-only, but 'scrape' implies a non-destructive fetch. The description adds value beyond the schema by providing cost and example.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.