Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide comprehensive behavioral hints (readOnlyHint: true, destructiveHint: false, idempotentHint: true, openWorldHint: true). The description adds no additional behavioral context beyond what's in annotations. It doesn't mention rate limits, authentication requirements, or what format the cloud IPs are returned in. With annotations doing the heavy lifting, the description adds minimal value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.