Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations present, the description carries the behavioral disclosure burden. It does add a meaningful non-storage guarantee: 'Page content is not stored.' However, it does not disclose whether the tool makes network requests, how failures are handled, or any other side-effect profile, leaving notable gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.