Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare non-read-only, non-idempotent, open-world mutation, and the description adds substantive behavior beyond them: sequential processing, rate limiting, a daily quota, and a 100-URL batch cap. It doesn't say what happens on partial failure or how the quota is consumed across batches, which keeps it short of a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.