Matt Chong | n8n Creator This workflow corresponds to n8n.io template #5863 — we link there as the canonical source.
This workflow follows the Agent → Gmail recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "Invoice Reminder: Gmail to Tasks",
"nodes": [
{
"id": "95eeaaed-ce70-4f9d-82aa-e67bec2a84d2",
"name": "Schedule Trigger",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
0,
-288
],
"parameters": {
"rule": {
"interval": [
{
"field": "hours"
}
]
}
},
"typeVersion": 1.2
},
{
"id": "46df89b3-2ac9-4905-ac0a-d4bcf4dbcf9a",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"onError": "continueRegularOutput",
"position": [
448,
-288
],
"parameters": {
"text": "=You are an intelligent assistant that reads emails and determines whether the message is related to an invoice or a payment notification.\n\nYour tasks:\n1. Determine if the email is invoice-related.\n2. If yes, extract:\n - Due date (in YYYY-MM-DD format, or null)\n - Amount due (as a number, no currency symbols)\n\nAlways include these metadata values:\nId: {{ $json.id }}\nthreadId: {{ $json.threadId }}\nbody: {{ $json.text }}\nsubject: {{ $json.subject }}\nsender: {{ $json.from.value[0].name }}\n\nReturn only a valid JSON object in the format below:\n\n```json\n{\n \"is_invoice\": true or false,\n \"due_date\": \"YYYY-MM-DD\" or null,\n \"amount_due\": number or null,\n \"email_id\": \"string\",\n \"thread_id\": \"string\",\n \"sender\": \"string\",\n \"subject\": \"string\"\n}",
"options": {},
"promptType": "define",
"hasOutputParser": true
},
"typeVersion": 2.1
},
{
"id": "9f3cb030-5bbb-4203-b473-84e986ab1848",
"name": "OpenAI Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
480,
-64
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4o",
"cachedResultName": "gpt-4o"
},
"options": {}
},
"typeVersion": 1.2
},
{
"id": "4fcf203d-d777-4aaf-b157-64f7ddea55c5",
"name": "Structured Output Parser",
"type": "@n8n/n8n-nodes-langchain.outputParserStructured",
"position": [
608,
-64
],
"parameters": {
"schemaType": "manual",
"inputSchema": "{...}"
},
"typeVersion": 1.3
},
{
"id": "51db6f62-ddb6-4cb3-b33e-b1431cbe9ba2",
"name": "No Operation, do nothing",
"type": "n8n-nodes-base.noOp",
"position": [
1072,
-96
],
"parameters": {},
"typeVersion": 1
},
{
"id": "a6abcee9-5187-4777-a843-1d7096ac674c",
"name": "Create a task",
"type": "n8n-nodes-base.googleTasks",
"position": [
1072,
-480
],
"parameters": {
"task": "",
"title": "=Invoice from {{ $json.output.sender }} \u2013 ${{ $json.output.amount_due }} due {{ $json.output.due_date }}",
"additionalFields": {}
},
"typeVersion": 1
},
{
"id": "09aa7d30-3328-42ea-a4d5-66944b72d43a",
"name": "Add Label to Email",
"type": "n8n-nodes-base.gmail",
"position": [
1072,
-288
],
"parameters": {
"messageId": "={{ $json.output.email_id }}",
"operation": "addLabels",
"labelNames": [
"Invoice"
]
},
"typeVersion": 2.1
},
{
"id": "7fca02d6-db42-430a-bf26-ef80f84eaee7",
"name": "Mark Email as read",
"type": "n8n-nodes-base.gmail",
"position": [
1296,
-288
],
"parameters": {
"messageId": "={{ $json.id }}",
"operation": "markAsRead"
},
"typeVersion": 2.1
},
{
"id": "e360894f-77e8-49cb-b8ba-e2d271fd521e",
"name": "Get Unread Emails",
"type": "n8n-nodes-base.gmail",
"position": [
224,
-288
],
"parameters": {
"simple": false,
"filters": {
"readStatus": "unread"
},
"options": {},
"operation": "getAll"
},
"typeVersion": 2.1
},
{
"id": "f5674f2a-6875-4b89-94f8-13fb2d2c05fd",
"name": "Check If Email is Invoice",
"type": "n8n-nodes-base.if",
"position": [
848,
-288
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "dc8158a0-29aa-4c7f-9de3-994a5d827331",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
},
"leftValue": "={{ $json.output.is_invoice }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "a38b2d77-9ead-436d-ab40-12fcced60f72",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
952,
-608
],
"parameters": {
"color": 5,
"width": 336,
"height": 288,
"content": "### \ud83d\udca1 Customize Task Format \nYou can change the title in this node. For example: `Pay invoice from {{sender}} by {{due_date}}` \nInclude more invoice details in the notes field if needed."
},
"typeVersion": 1
},
{
"id": "2f9a2857-ebe6-4d0f-a583-af4b655e4844",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-64,
0
],
"parameters": {
"width": 304,
"height": 224,
"content": "### \u26a0\ufe0f Setup Required \n- Connect your Gmail account using OAuth2 \n- Add your OpenAI API Key under **API Credentials** \n- Connect your Google Tasks account \n- Create this label in Gmail: **Invoice**"
},
"typeVersion": 1
},
{
"id": "6da66212-1ddb-4822-b660-70e0a94dc0b2",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-128,
-416
],
"parameters": {
"color": 5,
"width": 320,
"height": 272,
"content": "### \ud83d\udca1 Schedule Trigger \nThis runs every hour. \nYou can change the interval here depending on how often you want Gmail to be checked."
},
"typeVersion": 1
}
],
"connections": {
"AI Agent": {
"main": [
[
{
"node": "Check If Email is Invoice",
"type": "main",
"index": 0
}
]
]
},
"Schedule Trigger": {
"main": [
[
{
"node": "Get Unread Emails",
"type": "main",
"index": 0
}
]
]
},
"Get Unread Emails": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Add Label to Email": {
"main": [
[
{
"node": "Mark Email as read",
"type": "main",
"index": 0
}
]
]
},
"Structured Output Parser": {
"ai_outputParser": [
[
{
"node": "AI Agent",
"type": "ai_outputParser",
"index": 0
}
]
]
},
"Check If Email is Invoice": {
"main": [
[
{
"node": "Add Label to Email",
"type": "main",
"index": 0
},
{
"node": "Create a task",
"type": "main",
"index": 0
}
],
[
{
"node": "No Operation, do nothing",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow contains community nodes that are only compatible with the self-hosted version of n8n.
Source: https://n8n.io/workflows/5863/ — original creator credit. Request a take-down →
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