Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate readOnlyHint=false and destructiveHint=false, so the tool is a write operation but not destructive. The description adds minimal behavioral context beyond this, only explaining the key's purpose. It does not mention side effects, idempotency, or error conditions like duplicate keys.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.