Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description transparently discloses that query and fragment are dropped and that the result contains origin, host, and path. However, with no annotations, it does not cover behavior for the other parameters, invalid URLs, rejected inputs, or the exact return shape, leaving some important behavior undocumented.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.