Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds genuinely useful context by enumerating what the revision contains (body, sources, conditions, content hash, review state, attached outcome reports), but omits behavior on a missing/invalid revision_id and any authorization or rate-limit details.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.