Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. It implies read-only behavior via 'look up' and discloses the return content (signer status), which is meaningful behavioral context. It does not mention error handling or authentication, but this is acceptable for a simple status lookup.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.