Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide comprehensive hints (readOnly, non-destructive, idempotent, openWorld), so the description's burden is lower. The description adds that this is a GET operation, which aligns with readOnlyHint=true. However, it doesn't provide any additional behavioral context such as what 'GPU status' entails, whether authentication is required, potential rate limits, or error conditions. The description doesn't contradict annotations, but adds minimal value beyond them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.