Car service centre AI agent on WhatsApp
Customers ask "is my car ready?", get price ranges and book service slots on WhatsApp.
How it works
Trigger: WhatsApp — a customer sends a message
- A customer asks about a service, a price or their car.
- The agent checks your price list, or the customer's own open jobs.
- It finds free slots and books the service in your calendar.
- It alerts your service advisor.
What it can do
Unlike a fixed flow, an agent decides which of its tools to use, in what order — and remembers the conversation.
- Answers "is my car ready?" from your Jobs sheet
- Gives price ranges and durations
- Books service appointments
System prompt
The instructions that shape the agent. It's already inside the n8n template — copy it into Make or Zapier, and adjust the YOUR_… parts.
You are the WhatsApp assistant for YOUR_GARAGE, a car service centre. Reply in the customer's language and dialect (Egyptian Arabic, Gulf Arabic, Modern Standard Arabic or English). Be warm and brief.
Today is {{ $now.toFormat('cccc d LLLL yyyy, HH:mm') }}. Opening hours: YOUR_HOURS. The customer's phone is {{ $('Get question').item.json.from }}.
Tools:
- "Services & prices": our services (oil change, brakes, AC, inspection…) with price ranges and duration.
- "My car status": this customer's open jobs (plate, car, job, status, ready_at, estimate). It only returns the person who is messaging.
- "Check free slots": booked appointments between two dates, to find free slots.
- "Book service": books a confirmed appointment. Use only after the customer confirms the car (make, model, year, plate), service, date and time.
- "Notify team": alerts our service advisor about bookings, approvals for extra work, complaints and questions you can't answer.
Rules:
- Quote only price ranges from the list, and say the final price comes after inspection.
- Never diagnose problems or promise repair times; describe what the inspection will check.
- If a customer approves or refuses extra work, pass it to the team with "Notify team"; don't change the job yourself.Safety rules
Built into the prompt and the tools:
- Never diagnoses or promises repair times
- Only quotes price ranges, final price after inspection
- Passes extra-work approvals to a person
Uses your own AI key (Claude, OpenAI or another model). Cost depends on the model and conversation length — a small, fast model keeps most conversations to a fraction of a cent.
Diagram
Trigger App Code AI Agent tool
Code
JavaScript used in the Code step — already included in the template below.
// Keeps only text messages and pulls out who sent it and what they asked.
const msg = $input.first().json.messages?.[0];
if (!msg || msg.type !== "text") return [];
return [{ json: { from: msg.from, question: msg.text.body } }];Build it
Pick your tool — same automation, step by step.
Copy and paste straight into an n8n canvas (Ctrl+V), or download and use Import from File. Then connect your own credentials and replace every YOUR_… placeholder. AI steps use a Claude model node — swap it for OpenAI, Gemini or Ollama if you prefer.
Show code (366 lines)
{
"name": "Car service centre AI agent on WhatsApp (Flowngn)",
"nodes": [
{
"parameters": {
"content": "## Car service centre AI agent on WhatsApp\nCustomers ask \"is my car ready?\", get price ranges and book service slots on WhatsApp.\n\n**Setup**\n1. Open each node and connect your own credentials.\n2. Replace every YOUR_… placeholder.\n3. Test once, then activate.\n\nFree template from Flowngn",
"height": 260,
"width": 340
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Setup notes",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-420,
-60
]
},
{
"parameters": {
"updates": [
"messages"
]
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Incoming message",
"type": "n8n-nodes-base.whatsAppTrigger",
"typeVersion": 1,
"position": [
0,
0
],
"webhookId": "2c528f90-83ec-4354-a019-950940e3b8ba"
},
{
"parameters": {
"jsCode": "// Keeps only text messages and pulls out who sent it and what they asked.\nconst msg = $input.first().json.messages?.[0];\nif (!msg || msg.type !== \"text\") return [];\n\nreturn [{ json: { from: msg.from, question: msg.text.body } }];"
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Get question",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
300,
0
]
},
{
"parameters": {
"promptType": "define",
"text": "={{ $json.question }}",
"options": {
"systemMessage": "=You are the WhatsApp assistant for YOUR_GARAGE, a car service centre. Reply in the customer's language and dialect (Egyptian Arabic, Gulf Arabic, Modern Standard Arabic or English). Be warm and brief.\n\nToday is {{ $now.toFormat('cccc d LLLL yyyy, HH:mm') }}. Opening hours: YOUR_HOURS. The customer's phone is {{ $('Get question').item.json.from }}.\n\nTools:\n- \"Services & prices\": our services (oil change, brakes, AC, inspection…) with price ranges and duration.\n- \"My car status\": this customer's open jobs (plate, car, job, status, ready_at, estimate). It only returns the person who is messaging.\n- \"Check free slots\": booked appointments between two dates, to find free slots.\n- \"Book service\": books a confirmed appointment. Use only after the customer confirms the car (make, model, year, plate), service, date and time.\n- \"Notify team\": alerts our service advisor about bookings, approvals for extra work, complaints and questions you can't answer.\n\nRules:\n- Quote only price ranges from the list, and say the final price comes after inspection.\n- Never diagnose problems or promise repair times; describe what the inspection will check.\n- If a customer approves or refuses extra work, pass it to the team with \"Notify team\"; don't change the job yourself."
}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Garage agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 1.9,
"position": [
600,
0
]
},
{
"parameters": {
"model": {
"__rl": true,
"value": "claude-sonnet-5",
"mode": "list"
},
"options": {}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Claude model",
"type": "@n8n/n8n-nodes-langchain.lmChatAnthropic",
"typeVersion": 1.3,
"position": [
90,
220
]
},
{
"parameters": {
"sessionIdType": "customKey",
"sessionKey": "={{ $('Get question').item.json.from }}",
"contextWindowLength": 10
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Memory",
"type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
"typeVersion": 1.3,
"position": [
260,
220
]
},
{
"parameters": {
"descriptionType": "manual",
"toolDescription": "Returns our services with price ranges and durations.",
"operation": "read",
"documentId": {
"__rl": true,
"value": "YOUR_SPREADSHEET_ID",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "Services",
"mode": "name"
},
"options": {}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Services & prices",
"type": "n8n-nodes-base.googleSheetsTool",
"typeVersion": 4.5,
"position": [
430,
220
]
},
{
"parameters": {
"descriptionType": "manual",
"toolDescription": "Returns the open jobs of the customer who is messaging.",
"operation": "read",
"documentId": {
"__rl": true,
"value": "YOUR_SPREADSHEET_ID",
"mode": "id"
},
"sheetName": {
"__rl": true,
"value": "Jobs",
"mode": "name"
},
"filtersUI": {
"values": [
{
"lookupColumn": "phone",
"lookupValue": "={{ $('Get question').item.json.from }}"
}
]
},
"options": {}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "My car status",
"type": "n8n-nodes-base.googleSheetsTool",
"typeVersion": 4.5,
"position": [
600,
220
]
},
{
"parameters": {
"descriptionType": "manual",
"toolDescription": "Lists booked appointments between two dates, so you can find free slots within opening hours.",
"operation": "getAll",
"calendar": {
"__rl": true,
"value": "primary",
"mode": "id"
},
"returnAll": true,
"timeMin": "={{ $fromAI('start', \"Start of the time range, ISO 8601\", 'string') }}",
"timeMax": "={{ $fromAI('end', \"End of the time range, ISO 8601\", 'string') }}",
"options": {
"singleEvents": true,
"orderBy": "startTime"
}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Check free slots",
"type": "n8n-nodes-base.googleCalendarTool",
"typeVersion": 1.3,
"position": [
770,
220
]
},
{
"parameters": {
"descriptionType": "manual",
"toolDescription": "Books a confirmed service appointment.",
"calendar": {
"__rl": true,
"value": "primary",
"mode": "id"
},
"start": "={{ $fromAI('start', \"Appointment start, ISO 8601 with timezone\", 'string') }}",
"end": "={{ $fromAI('end', \"Appointment end, ISO 8601 with timezone\", 'string') }}",
"additionalFields": {
"summary": "={{ $fromAI('title', \"Service and car, e.g. Oil change — Toyota Corolla 2019\", 'string') }}",
"description": "=Phone: {{ $('Get question').item.json.from }}\n{{ $fromAI('details', 'Car plate and what the customer described', 'string') }}"
}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Book service",
"type": "n8n-nodes-base.googleCalendarTool",
"typeVersion": 1.3,
"position": [
940,
220
]
},
{
"parameters": {
"descriptionType": "manual",
"toolDescription": "Alerts the service advisor about bookings, extra-work approvals, complaints and questions you can't answer.",
"chatId": "YOUR_TEAM_CHAT_ID",
"text": "={{ $fromAI('message', \"What the team needs to know, including the customer's phone\", 'string') }}",
"additionalFields": {
"appendAttribution": false
}
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Notify team",
"type": "n8n-nodes-base.telegramTool",
"typeVersion": 1.2,
"position": [
1110,
220
]
},
{
"parameters": {
"operation": "send",
"phoneNumberId": "YOUR_PHONE_NUMBER_ID",
"recipientPhoneNumber": "={{ $('Get question').item.json.from }}",
"textBody": "={{ $json.output }}"
},
"id": "2c528f90-83ec-4354-a019-950940e3b8ba",
"name": "Reply on WhatsApp",
"type": "n8n-nodes-base.whatsApp",
"typeVersion": 1,
"position": [
900,
0
]
}
],
"connections": {
"Incoming message": {
"main": [
[
{
"node": "Get question",
"type": "main",
"index": 0
}
]
]
},
"Get question": {
"main": [
[
{
"node": "Garage agent",
"type": "main",
"index": 0
}
]
]
},
"Garage agent": {
"main": [
[
{
"node": "Reply on WhatsApp",
"type": "main",
"index": 0
}
]
]
},
"Claude model": {
"ai_languageModel": [
[
{
"node": "Garage agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Memory": {
"ai_memory": [
[
{
"node": "Garage agent",
"type": "ai_memory",
"index": 0
}
]
]
},
"Services & prices": {
"ai_tool": [
[
{
"node": "Garage agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"My car status": {
"ai_tool": [
[
{
"node": "Garage agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Check free slots": {
"ai_tool": [
[
{
"node": "Garage agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Book service": {
"ai_tool": [
[
{
"node": "Garage agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Notify team": {
"ai_tool": [
[
{
"node": "Garage agent",
"type": "ai_tool",
"index": 0
}
]
]
}
},
"pinData": {},
"settings": {
"executionOrder": "v1"
},
"meta": {
"templateCredsSetupCompleted": false
},
"tags": []
}In Make, create a new scenario and add these modules in order:
- WhatsApp Business Cloud › Watch Events (messages)
- Tools › Set variable / Iterator + Array aggregator (same logic as the Code step)
- Make AI Agents › Run an agent — give it these tools: “Services & prices” (Google Sheets), “My car status” (Google Sheets), “Check free slots” (Google Calendar), “Book service” (Google Calendar), “Notify team” (Telegram Bot); paste the system prompt as the agent's instructions
- WhatsApp Business Cloud › Send a Message
- Every module run uses Make operations — the free plan includes a monthly quota.
- Make's built-in functions (map, sum, formatDate…) can replace most Code steps; for complex logic use a code module.
- Module and step names can differ slightly as Make and Zapier update their apps.
In Zapier, create a new Zap and add these steps in order:
- WhatsApp — New Message
- Code by Zapier — Run JavaScript (paste the code from the Code section)
- Zapier Agents — create an agent (or AI by Zapier for a single step) — give it these tools: “Services & prices” (Google Sheets), “My car status” (Google Sheets), “Check free slots” (Google Calendar), “Book service” (Google Calendar), “Notify team” (Telegram); paste the system prompt as the agent's instructions
- WhatsApp — Send Message
- Zaps with more than two steps need a paid Zapier plan.
- Webhooks, Filters/Paths and Code by Zapier are premium features on some Zapier plans.
- Code by Zapier runs JavaScript: reuse the code shown above, reading inputs from inputData instead of $json.
- Module and step names can differ slightly as Make and Zapier update their apps.
Tips
- Update the status and ready_at columns when a job moves on; that's what customers ask about most.
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