Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare idempotentHint=true, so the caching note is partly redundant, though "one bounded" and the session-scoping prerequisite add real context. The description never explains why readOnlyHint=false on a pure search (session budget/attempt consumption?) nor any rate or attempt limits, which is a notable gap for a non-read-only tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.