Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description's only added behavioral content is that unavailable items come with a reason, which is a minor return-shape hint. With no output schema, the description should say more about what the response looks like and any access requirements, which it does not.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.