Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds a key behavioral constraint ('previously deleted memory') and clarifies the intent ('undo a deletion'), which goes beyond the sparse annotations. However, it does not disclose potential error conditions, whether the operation is reversible, or what happens if the memory is already restored. With no meaningful annotations, the description carries the burden but remains thin on side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.