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 read operation. The description adds no extra behavioral context beyond stating the purpose—it does not mention the default summary response or the effect of the 'raw' parameter. With annotations covering safety, a 3 is appropriate; the description adds minimal value on top of the structured metadata.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.