Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, establishing a safe read operation. The description adds that it aggregates sessions via search and retrieval to produce formatted context, which is a useful behavioral trait. However, it does not disclose criteria for selecting sessions or what 'formatted' entails beyond what annotations already imply.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.