Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds important behavior beyond the annotations: it replaces the current This Week, leaves the Saved Week reusable, creates an independent working copy, and returns the working copy servings or null when unset. This directly supports the destructive and idempotent annotation profile rather than contradicting it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.