Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide strong hints: readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true. The description adds value by specifying the return format ('JSON with stream status') and the possible status values ('active, idle, or terminated'), which aren't covered by annotations. It doesn't contradict annotations—the 'Get' action aligns with readOnlyHint.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.