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. 'Retrieves' implies a read-only operation, but it doesn't state whether side effects exist, whether a debugger attachment is required, or what the return structure is. This is insufficient given the lack of annotation support.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.