Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=true, so safety and repeatability are covered. The description adds only the fact that the saved searches carry e-mail alerts, which is a data attribute rather than a behavior; it says nothing about authentication requirements, scope (all saved searches vs. a subset), or ordering.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.