Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false, openWorldHint=true, so the safety profile is covered and the bar is lower. The description adds nothing beyond that: it does not say what gets overwritten (full replace vs. merge, which matters versus partial_update), what happens to omitted fields, or what authorization is required — and its "viewed or edited" phrasing blurs the read/write boundary the annotations define.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.