Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=true, so the mutation profile and public visibility are covered structurally. The description adds only the mildly useful signal that the thread is a shared, discussion-oriented artifact, and says nothing about auth requirements, moderation, or visibility limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.