Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of disclosing behavior. It clearly states the return value (score, band, signals) and that the tool is free, which implies a read-only operation without side effects. It does not detail error cases or rate limits, but for a straightforward getter, the disclosure is reasonably transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.