Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=true). The description adds one genuinely useful behavioral fact beyond them – that unauthorized related fields are masked in the response – but does not say which fields, under what permission conditions, or whether masking is silent or flagged.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.