Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Given no annotations, the description carries full burden. It discloses the operation (hash-chain verification), return fields, and purpose (tamper detection). It does not mention side effects, but verification is inherently read-only. Missing explicit read-only guarantee.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.