Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the transparency burden. The verb 'List' implies a read-only operation, which is a useful behavioral signal. However, it does not disclose whether the list is paginated, what fields a manifest contains, or whether authentication/authorization is required. Since it is a simple list, the implied behavior is somewhat sufficient, but additional details would improve transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.