Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only states 'Update' without addressing side effects, required preconditions (e.g., existing ActionPlanPerson), valid status values, or whether other fields are unaffected. This is a minimal mutation description with no added context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.