Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses that the tool applies a routing plan (implying state mutation), verifies the result, and returns rollback values, which hints at safety mechanisms. However, it doesn't specify what side effects occur, what verification entails, or the nature of the rollback values, leaving significant behavioral opacity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.