Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true, so the safety profile is covered. The description adds genuinely new behavioral context beyond the annotations: credentials transit in-memory only and are never stored (BYOK), which matters for an agent handling secrets. It still omits failure behavior (auth errors, rate limits, missing page).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.