Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It implies a read-only lookup via 'Find' and accurately describes the core behavior, but it does not disclose return shape, result format, matching semantics, or any limitations. This is adequate for a very simple lookup but not richly transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.