Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructiveHint=true, and the description adds valuable nuance by clarifying that archiving is reversible and not permanent ('not away', 'restore_from_archive brings them back'). This goes beyond the annotation to disclose the non-destructive nature in practice, which is critical for an agent to assess risk.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.