Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark destructiveHint and readOnlyHint false, and the description adds important non-obvious behavior: deletion is permanent, cannot be undone, and past run metrics are unaffected. This goes beyond the structured hints and clarifies the side-effect profile for a destructive operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.