Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare destructiveHint=true and readOnlyHint=false, so the destructive nature is covered. The description adds minimal extra behavioral context (e.g., 'clear sensitive data' implies irreversible deletion), but doesn't disclose additional traits beyond the annotations, such as whether deleting a non-existent key is an error or a no-op (idempotentHint is already set).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.