Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds useful context by specifying exactly what data is shown (license status, hardware ID, plan, expiration), which is not in the annotations. It does not mention any special permissions or output format, but for a zero-parameter read-only tool, this is adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.