Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden. It reveals the data content and implies a read-only listing, but it does not explicitly state that it has no side effects, requires no authentication, or returns a snapshot. It doesn't contradict annotations (there are none), so not a contradiction, but behavioral disclosure is only implicit.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.