Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It implicitly suggests the tool is safe (no secrets exposed) and is a read-only operation, but does not explicitly confirm no side effects, no destructive actions, or authentication requirements. The single behavioral trait is useful but incomplete.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.