Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered without the description. The description adds only 'recent' and 'active client' scoping, leaving undefined what 'recent' means, whether results are paginated, and why write-flavored parameters (confirm, dry_run, confirm_live) appear in a read-only list call.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.