Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. "Sends nothing" adds domain-specific value beyond that: for a bridge tool that lists bots it *may contact*, it clarifies that merely listing does not initiate contact. It does not, however, describe the return shape, which matters since there is no output schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.