Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining behavior. It discloses the main outputs (canonical transliteration, character meanings, and related hand-written name pages) directly. It could add more detail about whether multiple suggestions are returned or what exactly 'related hand-written name pages' contain, but the core behavior is transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.