Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey read-only, idempotent, and non-destructive behavior. The description adds valuable context beyond that: it returns confidence plus a single clarifyingQuestion when ambiguous, and it is backed by Gemini 2.5 Pro with a constrained JSON schema—helping the agent anticipate output shape and reliability.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.