Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It states that partial matching is supported and lists the return fields (domain, country, contact emails, phone numbers, social media profiles), which indicates a read/enrichment operation. However, it does not mention potential multiple matches, failure modes, or rate limits, limiting full transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.