Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses that incidents are retained in the system after being dropped from the provider's status page, which is valuable context. However, it does not describe the output format, possible empty results, or any errors. It also doesn't explicitly state that this is a read-only operation, though that is implied.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.