Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden, and it successfully reveals a non-obvious behavior: query strings and fragments are discarded from the result. It also makes the output shape clear by stating that origin, host, and path are returned, though it does not address invalid-input handling or error behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.