Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It doesn't state whether information is always available, whether it could return empty results, whether the data reflects a specific snapshot, or how comprehensive the skill list is. For a read-only retrieval with zero annotation coverage, this is a thin disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.