Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the transparency burden. It does signal a non-destructive read and specifies the resource type (HTML content), which is useful. However, it does not disclose any additional behavioral traits such as whether the full HTML document is returned, error handling, or authentication/rate-limit implications. For a simple read tool this is minimal but adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.