Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. It discloses that this is a compatibility alias and that onchain_lookup should be preferred, which is useful contextual behavior. However, it does not mention other behavioral aspects like return format, error handling, or read-only nature, though the name and schema imply a simple lookup.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.