Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey read-only, idempotent, non-destructive behavior, and the description aligns without contradiction. However, it adds no extra behavioral context beyond language scoping—e.g., what happens if language_code is missing or unsupported, or whether it falls back to a default.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.