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 states the action ('fetch') without disclosing behavioral traits such as rate limits, authentication needs, data freshness, error handling, or what the output contains (e.g., historical prices). This leaves critical operational details unknown.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.