Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool searches and optionally reads the first hit, which implies a read-only operation, but it does not disclose what the return value looks like (e.g., whether read_first=true returns the full document content or just a summary), how results are ordered, or behavior when no hits are found. It adds some context but lacks richer behavioral detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.