diff --git a/ui/desktop/src/components/ToolCallWithResponse.tsx b/ui/desktop/src/components/ToolCallWithResponse.tsx
index 63c5d4d005..53d3b3b704 100644
--- a/ui/desktop/src/components/ToolCallWithResponse.tsx
+++ b/ui/desktop/src/components/ToolCallWithResponse.tsx
@@ -22,7 +22,7 @@ import McpAppRenderer from './McpApps/McpAppRenderer';
 interface ToolGraphNode {
   tool: string;
   description: string;
-  depends_on: number[];
+  depends_on?: number[];
 }
 
 type UiMeta = {
@@ -737,7 +737,7 @@ function ToolGraphView({ toolGraph, code }: ToolGraphViewProps) {
 
     toolGraph.forEach((node, index) => {
       const deps =
-        node.depends_on.length > 0 ? ` (uses ${node.depends_on.map((d) => d + 1).join(', ')})` : '';
+        node.depends_on && node.depends_on.length > 0 ? ` (uses ${node.depends_on.map((d) => d + 1).join(', ')})` : '';
       lines.push(`${index + 1}. ${node.tool}: ${node.description}${deps}`);
     });