Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, covering safety. The description adds valuable context beyond annotations by specifying the translation (World English Bible) and listing accepted formats for book_code (OSIS, USFM, full name, alias), which gives insight into input flexibility.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.