Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It does convey two useful behaviors: matching is exact and the result set may contain multiple known editions. It does not disclose potential edge cases such as case sensitivity, empty results, authentication requirements, or whether the response is a list, relying instead on the word 'all' and the sibling names.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.