Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide readOnlyHint=false, idempotentHint=false, destructiveHint=false. The description adds context that this is a PATCH (partial update) that only modifies specified fields, which is behavior beyond the annotations. It does not mention side effects, permissions, or error behavior, but the partial-update semantics are clearly disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.