Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations (readOnlyHint, idempotentHint, destructiveHint false) already inform the agent of safe, idempotent behavior. The description adds that it fetches from the Wiktionary REST API with a default language subdomain, providing context beyond annotations. It doesn't mention rate limits or pagination, but given annotations, this is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.