diff --git a/Model/Source/Category.php b/Model/Source/Category.php
new file mode 100644
index 0000000..c363755
--- /dev/null
+++ b/Model/Source/Category.php
@@ -0,0 +1,101 @@
+<?php
+
+declare(strict_types=1);
+
+namespace RunAsRoot\AgenticCommerceProtocol\Model\Source;
+
+use Magento\Catalog\Model\ResourceModel\Category\CollectionFactory;
+use Magento\Framework\Api\SortOrder;
+use Magento\Framework\App\RequestInterface;
+use Magento\Framework\Data\OptionSourceInterface;
+use Magento\Store\Model\Store;
+
+class Category implements OptionSourceInterface
+{
+    public const NONE = 0;
+    public const SYSTEM_CATEGORY_ID = 0;
+    public const ROOT_LEVEL = 0;
+
+    /**
+     * @var CollectionFactory
+     */
+    private $collectionFactory;
+
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+
+    /**
+     * @param CollectionFactory $collectionFactory
+     * @param RequestInterface $request
+     */
+    public function __construct(
+        CollectionFactory $collectionFactory,
+        RequestInterface $request
+    ) {
+        $this->collectionFactory = $collectionFactory;
+        $this->request = $request;
+    }
+
+    /**
+     * Options getter
+     *
+     * @return array
+     */
+    public function toOptionArray(): array
+    {
+        $optionArray = [];
+        $arr = $this->toArray();
+        foreach ($arr as $value => $label) {
+            $optionArray[] = [
+                'value' => $value,
+                'label' => $label
+            ];
+        }
+
+        return $optionArray;
+    }
+
+    /**
+     * Get options in "key-value" format
+     *
+     * @return array
+     */
+    public function toArray(): array
+    {
+        return $this->getChildren(self::SYSTEM_CATEGORY_ID, self::ROOT_LEVEL);
+    }
+
+    /**
+     * Get Children option
+     *
+     * @param mixed $parentCategoryId
+     * @param mixed $level
+     * @return array
+     */
+    private function getChildren(int $parentCategoryId, int $level)
+    {
+        $storeId = (int) $this->request->getParam(Store::ENTITY, Store::DEFAULT_STORE_ID);
+        $options[self::NONE] = __('None');
+        $collection = $this->collectionFactory->create();
+        $collection->setStoreId($storeId);
+        $collection->addAttributeToSelect('name');
+        $collection->addAttributeToFilter('level', $level);
+        $collection->addAttributeToFilter('parent_id', $parentCategoryId);
+        $collection->setOrder('position', SortOrder::SORT_ASC);
+
+        foreach ($collection as $category) {
+            $options[$category->getId()] =
+                str_repeat(". ", max(0, ($category->getLevel() - 1) * 3)) . $category->getName();
+            if ($category->hasChildren()) {
+                $options = array_replace(
+                    $options,
+                    $this->getChildren((int) $category->getId(), $category->getLevel() + 1)
+                );
+            }
+        }
+
+        return $options;
+    }
+}
diff --git a/etc/adminhtml/system.xml b/etc/adminhtml/system.xml
index 958c16d..06e7f99 100644
--- a/etc/adminhtml/system.xml
+++ b/etc/adminhtml/system.xml
@@ -12,21 +12,21 @@
         <tab id="acp" translate="label" sortOrder="400">
             <label>Agentic Commerce Protocol</label>
         </tab>
-        
+
         <section id="acp" translate="label" type="text" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1">
             <label>General Configuration</label>
             <tab>acp</tab>
             <resource>RunAsRoot_AgenticCommerceProtocol::config</resource>
-            
+
             <group id="general" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                 <label>General Settings</label>
-                
+
                 <field id="enabled" translate="label comment" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Enable Module</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                     <comment>Enable/disable the ACP module</comment>
                 </field>
-                
+
                 <field id="api_key" translate="label comment" type="obscure" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>API Key</label>
                     <backend_model>Magento\Config\Model\Config\Backend\Encrypted</backend_model>
@@ -35,7 +35,7 @@
                         <field id="enabled">1</field>
                     </depends>
                 </field>
-                
+
                 <field id="test_mode" translate="label comment" type="select" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Test Mode</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
@@ -54,25 +54,25 @@
                     </depends>
                 </field>
             </group>
-            
+
             <group id="product_feed" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                 <label>Product Feed Settings</label>
-                
+
                 <field id="enabled" translate="label comment" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Enable Product Feed</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                     <comment>Enable product feed generation for ChatGPT discovery</comment>
                 </field>
-                
+
                 <field id="categories" translate="label comment" type="multiselect" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Include Categories</label>
-                    <source_model>Magento\Catalog\Model\Category\Attribute\Source\Categories</source_model>
+                    <source_model>RunAsRoot\AgenticCommerceProtocol\Model\Source\Category</source_model>
                     <comment>Select categories to include in product feed (leave empty for all)</comment>
                     <depends>
                         <field id="enabled">1</field>
                     </depends>
                 </field>
-                
+
                 <field id="max_products" translate="label comment" type="text" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Maximum Products</label>
                     <comment>Maximum number of products to include in feed (default: 1000)</comment>
@@ -82,16 +82,16 @@
                     </depends>
                 </field>
             </group>
-            
+
             <group id="webhooks" translate="label" type="text" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                 <label>Webhook Settings</label>
-                
+
                 <field id="enabled" translate="label comment" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Enable Webhooks</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                     <comment>Send order event notifications to OpenAI</comment>
                 </field>
-                
+
                 <field id="endpoint_url" translate="label comment" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Webhook Endpoint URL</label>
                     <comment>OpenAI webhook endpoint for order events</comment>
@@ -100,7 +100,7 @@
                         <field id="enabled">1</field>
                     </depends>
                 </field>
-                
+
                 <field id="signing_secret" translate="label comment" type="obscure" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Webhook Signing Secret</label>
                     <backend_model>Magento\Config\Model\Config\Backend\Encrypted</backend_model>