diff --git a/src/renderer/src/components/activity/ActivityPrototypePage.tsx b/src/renderer/src/components/activity/ActivityPrototypePage.tsx
index 62f709bd4d0..dd3f2714d8d 100644
--- a/src/renderer/src/components/activity/ActivityPrototypePage.tsx
+++ b/src/renderer/src/components/activity/ActivityPrototypePage.tsx
@@ -391,7 +391,7 @@ function AgentEventRow({
             </TooltipContent>
           </Tooltip>
         </div>
-        <div className="mt-0.5 break-words whitespace-pre-wrap text-sm text-muted-foreground">
+        <div className="mt-0.5 line-clamp-3 break-words whitespace-pre-wrap text-sm text-muted-foreground">
           {agentSummary(event)}
         </div>
         <div className="mt-1.5 flex min-w-0 flex-wrap items-center gap-x-2 gap-y-1 text-[11px] text-muted-foreground">