Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, covering safety. The description adds value by listing the exact return fields, which helps the agent know what to expect. It doesn't discuss edge cases like invalid DOIs, but given annotations and simplicity, it provides sufficient behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.