Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden; "hard-coded" usefully signals that the result is static and not configurable per call. However, it does not describe what the safeguards contain, whether they are prose or structured data, or how an agent should apply them, so behavioral disclosure is partial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.