Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It only says 'Get', implying a read operation, but does not disclose any behavioral traits like authentication needs, what happens if vaultId is invalid, or what 'accessor permissions' entails. Minimal transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.