Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only says 'List releases', implying a read operation, but it doesn't mention whether prereleases/drafts are included, how pagination behaves, or any rate limits. This is minimal disclosure beyond what the name conveys.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.