Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and adds almost nothing: it does not state that this returns sensitive credential material, whether elevated permissions/API key scope are needed, whether the retrieval is audited, or that the value changes after a rotation. 'Current' hints at rotation linkage but is never explained.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.