Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of disclosing behavior. It does not state whether the tool is read-only, what it returns, whether it has side effects, or any other behavioral trait. The phrase only names the topic, so an agent cannot infer operation semantics.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.