This workflow follows the Agent → Gmail recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Gmail Auto-Reply with AI",
"tags": [],
"nodes": [
{
"id": "50972917-6da6-4b55-b18b-0bd96445e9f8",
"name": "Trigger on New Email",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
0,
-352
],
"parameters": {
"filters": {
"readStatus": "unread"
},
"pollTimes": {
"item": [
{
"mode": "everyMinute"
}
]
}
},
"typeVersion": 1.3
},
{
"id": "f42bb871-a182-4708-aa12-65f6c9c5ee28",
"name": "Get Unread Email",
"type": "n8n-nodes-base.gmail",
"position": [
224,
-352
],
"parameters": {
"simple": false,
"options": {},
"messageId": "={{ $json.id }}",
"operation": "get"
},
"typeVersion": 2.1
},
{
"id": "c0ce4d37-a5ce-4926-9edf-5aa68d80426a",
"name": "Get Required Fields",
"type": "n8n-nodes-base.set",
"position": [
448,
-352
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"name": "threadId",
"type": "string",
"value": "={{ $json.threadId }}"
},
{
"name": "id",
"type": "string",
"value": "={{ $json.id }}"
},
{
"name": "From",
"type": "string",
"value": "={{ $json.headers.from }}"
},
{
"name": "message",
"type": "string",
"value": "={{ $json.text }}"
},
{
"name": "subject",
"type": "string",
"value": "={{ $json.subject }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "64d9c2c7-0ef8-49f2-9c6c-5b0aabd27112",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
672,
-352
],
"parameters": {
"text": "=You are an assistant that helps draft email replies.\n\nYour task:\n1. Read the email message below:\n\"{{ $json.message }}\"\n\n2. Decide if this is an email that requires a reply. \n - If it's spam, a notification, or irrelevant, set `isReply` to false. \n - If it's a genuine message that can be replied to, set `isReply` to true. \n\n3. If `isReply` is true, draft a short and polite reply that: \n - Acknowledges the sender. \n - Is under 120 words. \n - Does not promise action you cannot take. \n\n4. Return the result **only in valid JSON**, no extra text.\n\nJSON format to return:\n{\n \"isReply\": true | false,\n \"response\": \"string or empty if isReply is false\"\n}",
"options": {},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 2.2
},
{
"id": "5673e94b-82b0-407f-9db4-60b35dfb8253",
"name": "OpenAI",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
680,
-128
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4o-mini",
"cachedResultName": "gpt-4o-mini"
},
"options": {}
},
"typeVersion": 1.2
},
{
"id": "00fe0a38-cc10-492e-86d6-af0494c8afc9",
"name": "Structured Output",
"type": "@n8n/n8n-nodes-langchain.outputParserStructured",
"position": [
808,
-128
],
"parameters": {
"schemaType": "manual",
"inputSchema": "{\n \"type\": \"object\",\n \"properties\": {\n \"isReply\": {\n \"type\": \"boolean\",\n \"description\": \"Whether the email requires a reply\"\n },\n \"response\": {\n \"type\": \"string\",\n \"description\": \"The drafted reply text if isReply is true, otherwise empty\"\n }\n },\n \"required\": [\"isReply\", \"response\"]\n}\n"
},
"typeVersion": 1.3
},
{
"id": "7fd55349-a8a3-4c1b-8dc8-221a50915a5e",
"name": "Can AI Agent Respond?",
"type": "n8n-nodes-base.if",
"position": [
1024,
-352
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.output.isReply }}",
"rightValue": "true"
}
]
},
"looseTypeValidation": true
},
"typeVersion": 2.2
},
{
"id": "ba0480ca-4f1d-4813-b6d8-674ec1f2bafe",
"name": "Create a draft",
"type": "n8n-nodes-base.gmail",
"position": [
1248,
-352
],
"parameters": {
"message": "={{ $json.output.response }}",
"options": {
"threadId": "={{ $('Get Required Fields').item.json.threadId }}"
},
"subject": "={{ $('Get Required Fields').item.json.subject }}",
"resource": "draft"
},
"typeVersion": 2.1
},
{
"id": "be177f90-54e7-472f-8b30-3dd6c8c1f4a3",
"name": "Label Email As \"Action\"",
"type": "n8n-nodes-base.gmail",
"position": [
1472,
-352
],
"parameters": {
"labelIds": [
"Label_460185+1234567890"
],
"resource": "thread",
"threadId": "={{ $('Get Required Fields').item.json.threadId }}",
"operation": "addLabels"
},
"typeVersion": 2.1
},
{
"id": "434ebfe4-410a-4f49-9285-cfd6256abb6f",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-192,
0
],
"parameters": {
"width": 336,
"content": "## \ud83d\udee0\ufe0f Setup Instructions\n - Connect Gmail and OpenAI credentials before activating.\n - Make sure your Gmail has a label called `Action`."
},
"typeVersion": 1
},
{
"id": "77831399-3e74-454e-8e27-b9d6e2af638c",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
608,
-576
],
"parameters": {
"color": 5,
"width": 368,
"height": 656,
"content": "## \u26a0\ufe0f Reply Logic\n - AI won't reply to spam, notifications, or irrelevant messages.\n - Only genuine messages get responses. You can review drafts before sending.\n - Tweak the AI agent's prompt to match your brand voice."
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"connections": {
"OpenAI": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"AI Agent": {
"main": [
[
{
"node": "Can AI Agent Respond?",
"type": "main",
"index": 0
}
]
]
},
"Create a draft": {
"main": [
[
{
"node": "Label Email As \"Action\"",
"type": "main",
"index": 0
}
]
]
},
"Get Unread Email": {
"main": [
[
{
"node": "Get Required Fields",
"type": "main",
"index": 0
}
]
]
},
"Structured Output": {
"ai_outputParser": [
[
{
"node": "AI Agent",
"type": "ai_outputParser",
"index": 0
}
]
]
},
"Get Required Fields": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"Trigger on New Email": {
"main": [
[
{
"node": "Get Unread Email",
"type": "main",
"index": 0
}
]
]
},
"Can AI Agent Respond?": {
"main": [
[
{
"node": "Create a draft",
"type": "main",
"index": 0
}
]
]
}
}
}
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How this works
Save time managing your inbox by automatically generating personalised AI-powered replies to incoming Gmail messages, ensuring you never miss a chance to respond promptly without manual effort. This workflow suits busy professionals or teams handling high email volumes, such as customer support or sales roles, where quick acknowledgements build trust. The key step involves an AI agent powered by OpenAI analysing the email content to craft a context-aware response, which is then drafted in Gmail for your review.
Use this workflow when you receive routine enquiries that warrant standard yet tailored replies, like confirming receipt or providing initial guidance, especially during off-hours. Avoid it for sensitive communications requiring human oversight, such as legal or confidential matters, to prevent unintended disclosures. Common variations include routing replies to specific folders based on sender or integrating with tools like Google Calendar to reference upcoming events in responses.
About this workflow
Gmail Auto-Reply with AI. Uses gmailTrigger, gmail, agent, lmChatOpenAi. Event-driven trigger; 11 nodes.
Source: https://github.com/ScraperNode/awesome-n8n-templates/blob/main/templates/ai-and-llm/7513-gmail-auto-reply-generator-with-chatgpt/workflow.json — original creator credit. Request a take-down →
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