diff --git a/frontend/packages/agent/src/app.js b/frontend/packages/agent/src/app.js
index 6717f90e..190e3cc1 100644
--- a/frontend/packages/agent/src/app.js
+++ b/frontend/packages/agent/src/app.js
@@ -1648,8 +1648,8 @@ window.marked = marked;
           if (input.body != null) parts.push('body');
           if (input.interval_seconds != null) parts.push('interval');
           if (input.next_fire_at_unix != null) parts.push('next');
-          if (input.targets_add) parts.push('+' + input.targets_add.length + ' tgt');
-          if (input.targets_remove) parts.push('-' + input.targets_remove.length + ' tgt');
+          if (input.targets_add && input.targets_add.length) parts.push('+' + input.targets_add.length + ' tgt');
+          if (input.targets_remove && input.targets_remove.length) parts.push('-' + input.targets_remove.length + ' tgt');
           return short + ' ' + parts.join(' · ');
         }
         case 'mcp__hyperhive__request_schedule_prompt': {