Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It adds a critical behavioral disclosure: 'PHI — every call is audit-logged.' This warns the agent about sensitivity and audit side-effects. However, it does not cover error behavior, return format, or permissions, leaving some gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.