Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden and supplies almost nothing: 'Get' implies read-only, but there is no mention of rate limits, auth requirements, what 'prioritized' ordering means, or whether the watchlist parameter alters the result set. For a tool with zero annotation coverage this leaves the agent guessing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.