diff --git a/packages/components/nodes/tools/CustomTool/CustomTool.ts b/packages/components/nodes/tools/CustomTool/CustomTool.ts
index 9ceda9199..6ffcc0e21 100644
--- a/packages/components/nodes/tools/CustomTool/CustomTool.ts
+++ b/packages/components/nodes/tools/CustomTool/CustomTool.ts
@@ -60,7 +60,7 @@ class CustomTool_Tools implements INode {
         }
     }
 
-    async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
+    async init(nodeData: INodeData, input: string, options: ICommonObject): Promise<any> {
         const selectedToolId = nodeData.inputs?.selectedTool as string
         const customToolFunc = nodeData.inputs?.customToolFunc as string
 
@@ -101,7 +101,8 @@ class CustomTool_Tools implements INode {
 
             const flow = {
                 chatId: options.chatId, // id is uppercase (I)
-                chatflowId: options.chatflowid // id is lowercase (i)
+                chatflowId: options.chatflowid, // id is lowercase (i)
+                input
             }
 
             let dynamicStructuredTool = new DynamicStructuredTool(obj)
diff --git a/packages/ui/src/views/tools/HowToUseFunctionDialog.js b/packages/ui/src/views/tools/HowToUseFunctionDialog.js
index 00acef0d2..47ecee89c 100644
--- a/packages/ui/src/views/tools/HowToUseFunctionDialog.js
+++ b/packages/ui/src/views/tools/HowToUseFunctionDialog.js
@@ -43,6 +43,9 @@ const HowToUseFunctionDialog = ({ show, onCancel }) => {
                             <li>
                                 <code>$flow.chatflowId</code>
                             </li>
+                            <li>
+                                <code>$flow.input</code>
+                            </li>
                         </ul>
                     </li>
                     <li style={{ marginTop: 10 }}>
diff --git a/packages/ui/src/views/tools/ToolDialog.js b/packages/ui/src/views/tools/ToolDialog.js
index b011c07ed..ab6d6aa01 100644
--- a/packages/ui/src/views/tools/ToolDialog.js
+++ b/packages/ui/src/views/tools/ToolDialog.js
@@ -33,7 +33,7 @@ import { HIDE_CANVAS_DIALOG, SHOW_CANVAS_DIALOG } from 'store/actions'
 const exampleAPIFunc = `/*
 * You can use any libraries imported in Flowise
 * You can use properties specified in Output Schema as variables. Ex: Property = userid, Variable = $userid
-* You can get default flow config: $flow.sessionId, $flow.chatId, $flow.chatflowId
+* You can get default flow config: $flow.sessionId, $flow.chatId, $flow.chatflowId, $flow.input
 * You can get custom variables: $vars.<variable-name>
 * Must return a string value at the end of function
 */