Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Since no annotations are provided, the description fully bears the burden. It explicitly discloses that the tool returns a signed attestation and mentions the price ($0.001/call). It does not claim any destructive side effects, and for a health check, this is sufficient transparency. However, it could explicitly state it is read-only or non-mutating, preventing full marks.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.