Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but only states the basic function. It doesn't disclose behavioral traits such as whether this is a read-only operation, how results are returned (e.g., pagination, sorting), or any limitations (e.g., rate limits, authentication needs). This leaves significant gaps for an agent to understand tool behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.