Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the behavioral burden. It discloses that it works on public pages and handles JavaScript via auto-rendering, which is useful. However, it does not mention potential failure modes, authentication requirements, rate limits, or whether the tool follows redirects. The safety profile of a read operation is implied but not explicit.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.