Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description carries the full transparency burden and does a solid job: it discloses conditional behavior for preview sessions versus completed sessions, mentions the 5-sample-row limit, locked_rows, and unlock_url. It does not cover error cases or authentication, but for a simple fetch tool this is meaningful behavioral detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.