Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. 'Replace' hints that this is a full overwrite (as opposed to PATCH), which is useful, but nothing is said about what replacement actually entails for a certificate — whether a new key pair is generated, whether existing serial/revocation state is destroyed, or what permissions are required. For an irreversible mutation tool this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.