Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It usefully discloses that the tool checks against exactly 9 core slot targets and ranks voids by severity, implying a read-only analysis. However, it does not state whether it mutates anything, what the output format is, or any limitations beyond the 9-slot model.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.