diff --git a/src/components/CustomMessage.tsx b/src/components/CustomMessage.tsx
index 59ab084ab..205b12884 100644
--- a/src/components/CustomMessage.tsx
+++ b/src/components/CustomMessage.tsx
@@ -10,13 +10,14 @@ import CurrentUserMessage from './CurrentUserMessage';
 import CustomMessageBody from './CustomMessageBody';
 import CustomTypingIndicatorBubble from './CustomTypingIndicatorBubble';
 import FileMessage from './FileMessage';
+import { CarouselMessage } from './messages/CarouselMessage';
 import FormMessage from './messages/FormMessage';
-import { ShopItemsMessage } from './messages/ShopItemsMessage';
 import ParsedBotMessageBody from './ParsedBotMessageBody';
 import UserMessageWithBodyInput from './UserMessageWithBodyInput';
 import { useConstantState } from '../context/ConstantContext';
 import { useWidgetSession } from '../context/WidgetSettingContext';
 import { TypingBubble } from '../foundation/components/TypingBubble';
+import { WidgetCarouselItem } from '../types';
 import { getSourceFromMetadata, parseTextMessage, Token } from '../utils';
 import { messageExtension } from '../utils/messageExtension';
 import { isSentBy } from '../utils/messages';
@@ -34,6 +35,7 @@ export default function CustomMessage(props: Props) {
   const { replacementTextList, enableEmojiFeedback, botStudioEditProps = {} } = useConstantState();
   const { userId: currentUserId } = useWidgetSession();
   const { botInfo } = botStudioEditProps;
+  const getCarouselItems = useCarouselItems(message);
 
   const botUserId = botUser?.userId;
   const botProfileUrl = botInfo?.profileUrl ?? botUser?.profileUrl ?? '';
@@ -107,14 +109,20 @@ export default function CustomMessage(props: Props) {
 
       const textMessageBody = <ParsedBotMessageBody text={message.message} tokens={tokens} sources={sources} />;
 
-      // commerce carousel message
-      if (messageExtension.commerceShopItems.isValid(message)) {
+      // carousel message
+      const carouselItems = getCarouselItems();
+      if (carouselItems.length > 0) {
         return (
           <BotMessageWithBodyInput
             wideContainer
             {...props}
             bodyComponent={
-              <ShopItemsMessage message={message} streamingBody={<TypingBubble />} textBody={textMessageBody} />
+              <CarouselMessage
+                streaming={messageExtension.isStreaming(message)}
+                items={carouselItems}
+                streamingBody={<TypingBubble />}
+                textBody={textMessageBody}
+              />
             }
             createdAt={message.createdAt}
             messageFeedback={renderFeedbackButtons()}
@@ -148,3 +156,27 @@ export default function CustomMessage(props: Props) {
 
   return <></>;
 }
+
+function useCarouselItems(message: BaseMessage) {
+  const { tools } = useConstantState();
+  return () => {
+    if (messageExtension.commerceShopItems.isValid(message)) {
+      return messageExtension.commerceShopItems.getValidItems(message);
+    }
+
+    const functionCalls = messageExtension.functionCalls.getAdapterParams(message);
+    if (functionCalls.length > 0 && tools.functionCall.carouselAdapter) {
+      try {
+        return functionCalls
+          .map((fn) => tools.functionCall.carouselAdapter?.(fn))
+          .flat()
+          .filter((it): it is WidgetCarouselItem => !!it);
+      } catch (err) {
+        console.warn('Failed to run carousel adapter:', err);
+        return [];
+      }
+    }
+
+    return [];
+  };
+}
diff --git a/src/components/messages/ShopItemsMessage.tsx b/src/components/messages/CarouselMessage.tsx
similarity index 89%
rename from src/components/messages/ShopItemsMessage.tsx
rename to src/components/messages/CarouselMessage.tsx
index dc96c6f3f..d313b905d 100644
--- a/src/components/messages/ShopItemsMessage.tsx
+++ b/src/components/messages/CarouselMessage.tsx
@@ -1,12 +1,11 @@
-import { UserMessage } from '@sendbird/chat/message';
 import { ReactNode } from 'react';
 import styled, { useTheme } from 'styled-components';
 
 import { useConstantState } from '../../context/ConstantContext';
 import ChevronLeft from '../../icons/chevron-left.svg';
 import ChevronRight from '../../icons/chevron-right.svg';
+import { WidgetCarouselItem } from '../../types';
 import { openURL } from '../../utils';
-import { messageExtension } from '../../utils/messageExtension';
 import { SnapCarousel } from '../ui/SnapCarousel';
 
 const listPadding = 16;
@@ -70,20 +69,19 @@ const Button = styled.button<{ direction: 'left' | 'right' }>(({ theme, directio
 }));
 
 type Props = {
-  message: UserMessage;
+  streaming: boolean;
   textBody: ReactNode;
   streamingBody: ReactNode;
+  items: WidgetCarouselItem[];
 };
-export const ShopItemsMessage = ({ message, textBody, streamingBody }: Props) => {
+export const CarouselMessage = ({ streaming, textBody, streamingBody, items }: Props) => {
   const theme = useTheme();
   const { isMobileView } = useConstantState();
 
-  const items = messageExtension.commerceShopItems.getValidItems(message);
-  const isStreaming = messageExtension.isStreaming(message);
-  const shouldRenderCarouselBody = isStreaming || items.length > 0;
+  const shouldRenderCarouselBody = streaming || items.length > 0;
   const shouldRenderButtons = !isMobileView && items.length >= 2;
   const renderCarouselBody = () => {
-    if (isStreaming) return streamingBody;
+    if (streaming) return streamingBody;
 
     return (
       <SnapCarousel
diff --git a/src/const.ts b/src/const.ts
index 2e1234624..91db229d7 100644
--- a/src/const.ts
+++ b/src/const.ts
@@ -10,7 +10,7 @@ import { StringSet } from '@uikit/ui/Label/stringSet';
 import type { ToggleButtonProps } from './components/widget/WidgetToggleButton';
 import { BotStyle } from './context/WidgetSettingContext';
 import RefreshIcon from './icons/ic-refresh.svg';
-import { SendbirdChatAICallbacks } from './types';
+import { FunctionCallAdapter, SendbirdChatAICallbacks, WidgetCarouselItem } from './types';
 import { noop } from './utils';
 
 // Most of browsers use a 32-bit signed integer as the maximum value for z-index
@@ -68,18 +68,25 @@ export const DEFAULT_CONSTANT = {
   messageInputControls: {
     blockWhileBotResponding: 10000,
   },
-} satisfies Partial<Constant>;
+  tools: {
+    functionCall: {
+      carouselAdapter({ response }) {
+        if (isMealsResponse(response)) {
+          return response.meals.map((it) => ({ title: it.strMeal, url: '', featured_image: it.strMealThumb }));
+        }
 
-type ConfigureSession = (sdk: SendbirdChat | SendbirdGroupChat | SendbirdOpenChat) => SessionHandler;
+        return [];
+      },
+    },
+  },
+} satisfies Partial<Constant>;
 
-type MessageData = {
-  suggested_replies?: string[];
-};
+// TODO: Remove this function when the Demo is finished
+function isMealsResponse(response: unknown): response is { meals: { strMeal: string; strMealThumb: string }[] } {
+  return !!response && typeof response === 'object' && 'meals' in response && Array.isArray(response.meals);
+}
 
-type FirstMessageItem = {
-  data: MessageData;
-  message: string;
-};
+type ConfigureSession = (sdk: SendbirdChat | SendbirdGroupChat | SendbirdOpenChat) => SessionHandler;
 type MatchString = string;
 type ReplaceString = string;
 
@@ -123,7 +130,7 @@ export interface OnWidgetOpenStateChangeParams {
   value: boolean;
 }
 
-export interface Constant extends ConstantFeatureFlags {
+export interface Constant extends ConstantFeatureFlags, ConstantAIFeatures {
   /**
    * @public
    * @description User nickname to be used in the widget.
@@ -213,7 +220,7 @@ export interface Constant extends ConstantFeatureFlags {
    * @private
    * @description First message data to be sent when the widget is opened.
    */
-  firstMessageData: FirstMessageItem[];
+  firstMessageData: { data: { suggested_replies?: string[] }; message: string }[];
   /**
    * @private
    * @description Custom API host.
@@ -261,6 +268,18 @@ export interface Constant extends ConstantFeatureFlags {
   onWidgetOpenStateChange?: (params: OnWidgetOpenStateChangeParams) => void;
 }
 
+interface ConstantAIFeatures {
+  /**
+   * @public
+   * @description tools to be used in the widget.
+   * */
+  tools: {
+    functionCall: {
+      carouselAdapter?: FunctionCallAdapter<WidgetCarouselItem[]>;
+    };
+  };
+}
+
 interface ConstantFeatureFlags {
   /**
    * @public
diff --git a/src/context/ConstantContext.tsx b/src/context/ConstantContext.tsx
index 17141f553..046377e50 100644
--- a/src/context/ConstantContext.tsx
+++ b/src/context/ConstantContext.tsx
@@ -109,6 +109,12 @@ export const ConstantStateProvider = (props: PropsWithChildren<ConstantContextPr
             ...props.customRefreshComponent?.style,
           },
         },
+        tools: {
+          functionCall: {
+            ...initialState.tools.functionCall,
+            ...props.tools?.functionCall,
+          },
+        },
       }}
     >
       {props.children}
diff --git a/src/types.ts b/src/types.ts
index 0fd1c669a..2cb372a53 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -7,10 +7,8 @@ export interface SendbirdChatAICallbacks {
   onWidgetSettingFailure?: (error: Error) => void;
 }
 
-export interface FunctionCallRequestInfo {
-  headers: {
-    'Api-Token': string;
-  };
+export interface FunctionCallRequest {
+  headers: object;
   method: string;
   query_params: object;
   request_body: object;
@@ -19,7 +17,23 @@ export interface FunctionCallRequestInfo {
 
 export interface FunctionCallData {
   name: string;
-  request: FunctionCallRequestInfo;
+  request: FunctionCallRequest;
   response_text: string;
   status_code: number;
 }
+
+export interface WidgetCarouselItem {
+  title: string;
+  url: string;
+  featured_image: string;
+}
+
+export interface FunctionCallAdapterParams {
+  name: string;
+  request: FunctionCallRequest;
+  response: unknown;
+}
+
+export interface FunctionCallAdapter<T> {
+  (params: FunctionCallAdapterParams): T;
+}
diff --git a/src/utils/index.ts b/src/utils/index.ts
index 1089273ed..af5650674 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -1,7 +1,7 @@
 import type SendbirdChat from '@sendbird/chat';
 import { BaseMessage } from '@sendbird/chat/message';
 
-import { parseMessageDataSafely } from './messages';
+import { jsonParseSafely } from './messages';
 import { Source } from '../components/SourceContainer';
 import { widgetServiceName } from '../const';
 
@@ -89,7 +89,7 @@ function isDelimiterIndex(index: number, inputString: string, delimiter: string)
 }
 
 export function getSourceFromMetadata(message: BaseMessage) {
-  const data: MessageMetaData = parseMessageDataSafely(message.data);
+  const data: MessageMetaData = jsonParseSafely(message.data);
   const sources: Source[] = Array.isArray(data['metadatas'])
     ? data['metadatas']?.filter((source) => source.source_type !== 'file')
     : [];
diff --git a/src/utils/messageExtension.ts b/src/utils/messageExtension.ts
index 1b79d709f..ba350e927 100644
--- a/src/utils/messageExtension.ts
+++ b/src/utils/messageExtension.ts
@@ -1,17 +1,12 @@
-import { BaseMessage, UserMessage } from '@sendbird/chat/message';
+import { BaseMessage } from '@sendbird/chat/message';
 
 import { extractUrls } from './index';
-import { parseMessageDataSafely } from './messages';
-
-export interface CommerceShopItem {
-  title: string;
-  url: string;
-  featured_image: string;
-}
+import { jsonParseSafely } from './messages';
+import { FunctionCallAdapterParams, FunctionCallData, WidgetCarouselItem } from '../types';
 
 export const messageExtension = {
   isStreaming(message: BaseMessage) {
-    const data = parseMessageDataSafely(message.data);
+    const data = jsonParseSafely(message.data);
     if (typeof data === 'object') {
       return Boolean(data['stream']);
     } else {
@@ -20,29 +15,47 @@ export const messageExtension = {
   },
   isBotWelcomeMsg(message: BaseMessage, botId: string | null) {
     if ((message.isUserMessage() || message.isFileMessage()) && message.sender.userId === botId) {
-      const data = parseMessageDataSafely(message.data);
+      const data = jsonParseSafely(message.data);
       // Note: respond_mesg_id and stream is only set when the bot message is a response to a user message.
       return !data?.respond_mesg_id && !data?.stream;
     }
 
     return false;
   },
+  isInputDisabled(message: BaseMessage | null) {
+    return !!message?.extendedMessagePayload?.disable_chat_input;
+  },
   commerceShopItems: {
-    isValid(message: UserMessage): boolean {
+    isValid(message: BaseMessage): boolean {
       return ((message.extendedMessagePayload?.commerce_shop_items ?? []) as unknown[]).length > 0;
     },
-    getItems(message: UserMessage): CommerceShopItem[] {
-      return (message.extendedMessagePayload?.commerce_shop_items ?? []) as CommerceShopItem[];
+    getItems(message: BaseMessage): WidgetCarouselItem[] {
+      return (message.extendedMessagePayload?.commerce_shop_items ?? []) as WidgetCarouselItem[];
     },
-    getValidItems(message: UserMessage): CommerceShopItem[] {
+    getValidItems(message: BaseMessage): WidgetCarouselItem[] {
+      if (!message.isUserMessage()) return [];
       const urls = extractUrls(message.message);
       return this.getItems(message)
         .filter((it) => urls.includes(it.url))
         .sort((a, b) => urls.indexOf(a.url) - urls.indexOf(b.url));
     },
   },
-  isInputDisabled(message: BaseMessage | null) {
-    return !!message?.extendedMessagePayload?.disable_chat_input;
+  functionCalls: {
+    parse(message: BaseMessage) {
+      const data = jsonParseSafely(message.data);
+      return data.function_calls ?? [];
+    },
+    isFunctionCall(obj: unknown): obj is FunctionCallData {
+      return !!obj && typeof obj === 'object' && 'name' in obj && 'request' in obj && 'response_text' in obj;
+    },
+    getAdapterParams(message: BaseMessage): FunctionCallAdapterParams[] {
+      const functionCalls = this.parse(message);
+      return functionCalls.filter(this.isFunctionCall).map((fn: FunctionCallData) => ({
+        name: fn.name,
+        request: fn.request,
+        response: jsonParseSafely(fn.response_text),
+      }));
+    },
   },
 };
 
diff --git a/src/utils/messages.ts b/src/utils/messages.ts
index 94be19e76..d51a213ee 100644
--- a/src/utils/messages.ts
+++ b/src/utils/messages.ts
@@ -33,7 +33,7 @@ export function isSentBy(message: BaseMessage, userId?: string | null) {
   return getSenderUserIdFromMessage(message) === userId;
 }
 
-export function parseMessageDataSafely(messageData: string) {
+export function jsonParseSafely(messageData: string) {
   try {
     return JSON.parse(messageData === '' ? '{}' : messageData);
   } catch (error) {