Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. Beyond that the description adds only the HTTP path; it says nothing about what an alert represents, whether results are paginated or time-bounded, or how many are typically returned.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.