Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the agent knows this is a safe, externally-scoped read. The description adds almost nothing beyond that, only implying completeness via 'full details'. No auth, rate-limit, or response-shape context, but the annotation bar lowers expectations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.