Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It only says 'Estimate', which implies a non-destructive calculation, but does not disclose other behavioral aspects such as authentication needs, rate limits, or whether it modifies data. The presence of an output schema partially compensates, but the description itself is insufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.