Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses that page content is not stored, which is a useful behavioral trait. However, it does not mention other aspects like whether the URL is fetched live, rate limits, authentication requirements, or error behavior, so coverage is partial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.