Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true, so the description adds context beyond that: why you would forget (stale, done, sensitive data) and the pairing with remember/recall. It does not cover failure behaviors (e.g., missing key), but the annotation already covers the main safety profile.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.