Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It discloses that the output is an Ed25519-signed capsule with route bodies, but it does not state whether the operation has side effects, requires authentication, can fail, or what the capsule's lifecycle is.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.