Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already signal a mutating, non-idempotent, destructive operation, and the description adds meaningful context: the token is one-time, claiming extends the drop lifetime, can revive an offline drop during its recovery window, and grants new capabilities. It also notes the sp_ API key requirement, which is beyond what annotations provide. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.