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. 'Get details' implies a read-only operation but does not explicitly state non-mutating behavior, required permissions, or what 'details' entails. It lacks context about return format or error semantics.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.