Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so the read-only nature is covered. The description adds the 'fuzzy-search' behavior and the fact that it searches a catalog, which is useful context. However, it doesn't disclose result format, sorting, or any limitations of the fuzzy search.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.