Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, non-destructive behavior, and closed-world scope, but the description adds important behavioral context: the transcript words go to the view only, shownInView is true, and the result carries title and length. This clarifies the side effect and result shape beyond what annotations provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.