Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds meaningful behavioral context beyond annotations: the link is signed, expiring, works for any tier, and returns a specific object shape. It also clarifies the auth context ('without forever-tier password auth'). It does not, however, disclose prerequisites like sessionToken or potential side effects of issuing multiple links.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.