diff --git a/ui/desktop/src/components/ToolCallWithResponse.tsx b/ui/desktop/src/components/ToolCallWithResponse.tsx
index 971bfea58f5b..bda8bb31e66b 100644
--- a/ui/desktop/src/components/ToolCallWithResponse.tsx
+++ b/ui/desktop/src/components/ToolCallWithResponse.tsx
@@ -166,6 +166,11 @@ function ToolCallView({
   // Only expand if there are actual results that need to be shown, not just for tool details
   const isShouldExpand = toolResults.some((v) => v.isExpandToolResults);
 
+  // Helper function to truncate long values
+  const truncate = (str: string, maxLength: number = 50): string => {
+    return str.length > maxLength ? str.substring(0, maxLength) + '...' : str;
+  };
+
   // Function to create a descriptive representation of what the tool is doing
   const getToolDescription = () => {
     const args = toolCall.arguments as Record<string, ToolCallArgumentValue>;
@@ -176,11 +181,6 @@ function ToolCallView({
       return typeof value === 'string' ? value : JSON.stringify(value);
     };
 
-    // Helper function to truncate long values
-    const truncate = (str: string, maxLength: number = 50): string => {
-      return str.length > maxLength ? str.substring(0, maxLength) + '...' : str;
-    };
-
     // Generate descriptive text based on tool type
     switch (toolName) {
       case 'text_editor':
@@ -292,20 +292,8 @@ function ToolCallView({
         return 'poking around...';
 
       default: {
-        // Fallback to showing key parameters for unknown tools
-        const entries = Object.entries(args);
-        if (entries.length === 0) return null;
-
-        // For a single parameter, show key and truncated value
-        if (entries.length === 1) {
-          const [key, value] = entries[0];
-          const stringValue = getStringValue(value);
-          const truncatedValue = truncate(stringValue, 30);
-          return `${key}: ${truncatedValue}`;
-        }
-
-        // For multiple parameters, just show the keys
-        return entries.map(([key]) => key).join(', ');
+        // For unknown tools, always return null to fall back to tool name
+        return null;
       }
     }
 
@@ -325,8 +313,9 @@ function ToolCallView({
               if (description) {
                 return description;
               }
-              // Fallback to the original tool name formatting
-              return snakeToTitleCase(toolCall.name.substring(toolCall.name.lastIndexOf('__') + 2));
+              // Fallback to formatted and truncated tool name using shared truncate function
+              const toolName = toolCall.name.substring(toolCall.name.lastIndexOf('__') + 2);
+              return truncate(snakeToTitleCase(toolName));
             })()}
           </span>
         </>