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 only says 'search', which implies a read-only operation, but it does not state that it returns a list of contacts, how pagination works, or any side effects. There is no information about sorting, default behavior, or what 'other criteria' might be supported. The description adds little beyond the tool name itself.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.