Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description carries the full burden of behavioral disclosure. It only states the purpose and return type, without mentioning side effects, permissions, rate limits, or error conditions. For a read-only 'get' tool, this minimalism may be acceptable, but it offers no explicit assurance of non-mutating behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.