Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, non-destructive, non-open-world behavior. The description adds substantial behavioral detail: tasks and findings expire 30 days after creation, pagination can return an empty page with a continuation cursor, and status summaries are recorded rather than fetched from upstream analyses.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.