Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It lists the exact return fields, which is useful, but it does not disclose potential failure scenarios (e.g., invalid URL, missing data) or whether any special permissions are required. The behavior is a simple read, but edge cases are not addressed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.