Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only say readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=false, which an agent cannot fully interpret. The description adds the crucial behavior: the submission is persisted and read by a human, and it imposes a privacy rule (no names, emails, or details about the person being helped). It also confirms nothing is destroyed, consistent with destructiveHint=false.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.