Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only reveals that the output is sanitized, with no mention of whether resolution can fail, what sanitization strips, whether the operation has side effects, or what happens when the binding does not exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.