Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so the safe read-only nature is covered. The description adds useful context about what kind of documents are returned (genesis materials, with genre and date) but does not disclose details like output format, pagination, or behavior on invalid ELIs. This is acceptable given the read-only annotation, but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.