Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true, so the description's 'Delete' is consistent. It adds minimal extra behavioral context beyond confirming what is destroyed (the memory identified by key), but does not disclose irreversibility, side effects, or permissions. This is adequate given annotation coverage, but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.