Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety and extensibility profile is covered. The description adds the subscription/push nature and the ADL alert resource, but it does not disclose the stream lifecycle, message format, or how to stop the subscription.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.