Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, open-world behavior, so the safety profile is covered. The description adds two things annotations cannot: the required 'support:write' right for a read-oriented tool, and the contents/ordering of results (status, date, project, agent-attribution, link, newest first). It stops short of pagination or rate-limit detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.