Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of disclosing behavioral traits such as permissions required, side effects (e.g., changing subsequent API calls), or reversibility. The brief description provides none of this, leaving the agent unaware of important implications.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.