Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only provide readOnlyHint=true, so the description carries most of the behavioral burden and does add real context: source precedence, the fallback-language rule, the 'if neither exists, list available languages' outcome, and team-endpoint download links. It does not mention pagination or size limits, but for a read-only tool this is a solid disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.