Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already establish that the tool is read-only, idempotent, and non-destructive, so the description does not need to restate that. It adds 'exact' and a list of outputs, but it does not explain how words, sentences, or paragraphs are tokenized, or how reading time is calculated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.