Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish read-only, idempotent, non-destructive, closed-world behavior, so the safety bar is met. The description still adds real context: the optional includeContent flag pulls long-form bodies and is explicitly flagged as large, which is a useful performance cue the annotations don't convey.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.