Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, covering safety. The description adds the key behavioral detail that it returns the analysis result if completed, implying a status/result distinction. This enriches the annotation-covered behavioral profile without contradicting it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.