diff --git a/packages/ui/src/components/tool-call-item.tsx b/packages/ui/src/components/tool-call-item.tsx
index db93c03e..32888fae 100644
--- a/packages/ui/src/components/tool-call-item.tsx
+++ b/packages/ui/src/components/tool-call-item.tsx
@@ -81,6 +81,12 @@ function getSubtitle(toolName: string, args?: Record<string, unknown>): string {
       const ticker = params?.ticker ? String(params.ticker).toUpperCase() : ""
       return ticker ? `${action} ${ticker}` : action
     }
+    case "sessions_spawn": {
+      const label = args.label ? String(args.label) : ""
+      if (label) return label.length > 60 ? label.slice(0, 57) + "…" : label
+      const task = String(args.task ?? "")
+      return task.length > 60 ? task.slice(0, 57) + "…" : task
+    }
     default:
       return ""
   }
@@ -100,6 +106,7 @@ const RUNNING_LABELS: Record<string, string> = {
   web_search: "searching…",
   web_fetch: "fetching…",
   data: "fetching…",
+  sessions_spawn: "spawning…",
 }
 
 /** Stats derived from tool result content */