Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full disclosure burden. It successfully reveals the authentication requirement (MERX_API_KEY), but omits other behavioral traits such as what happens if the key is missing, whether the result is cached, or the specific structure of the returned address/memo data.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.