Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Description adds significant behavioral context beyond annotations: it mentions running verification adapters (HTTP, file, DB), returning evidence, caching previous results, force re-verification, and authentication requirements. The idempotentHint is supported by the caching behavior, and there is no contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.