Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With all annotation hints set to false, the description carries the burden and adds meaningful behavioral context: it quarantines the object, queues validation, and prevents usability until validation passes. It does not cover failure behavior or idempotency, but it discloses the main side effects well beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.