Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so the description need not belabor safety. It adds useful context that the response includes security schemes and servers, which informs response expectations. However, it does not disclose other behavioral traits such as error handling, rate limits, or the full response structure. With annotation coverage, this is adequate but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.