This workflow follows the Gmail → HTTP Request recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"meta": {
"templateCredsSetupCompleted": true
},
"nodes": [
{
"id": "ad5b12df-3bdf-4672-99a7-0034664f29ef",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1180,
120
],
"parameters": {
"color": 4,
"width": 420.4803040774015,
"height": 189.69151356225348,
"content": "## Reply draft with OpenAI Assistant\nThis workflow automatically transfers content of incoming email messages with specific labels into OpenAI Assitant and returns reply draft. After draft is composed, trigger label is deleted from the thread.\n\n**Please remember to configure your OpenAI Assistant first.**"
},
"typeVersion": 1
},
{
"id": "80a93a48-0576-4dfb-817a-34cbc215307a",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-740,
120
],
"parameters": {
"width": 451.41125086385614,
"height": 313.3056033573073,
"content": "### Schedule trigger and get emails\nRun the workflow in equal intervals and check for threads with specific labels (trigger labels)."
},
"typeVersion": 1
},
{
"id": "0dba2603-8012-47d1-8c60-4068924b74cd",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1180,
340
],
"parameters": {
"color": 3,
"width": 421.0932411886662,
"height": 257.42916378714597,
"content": "## \u26a0\ufe0f Note\n\n1. Complete video guide for this workflow is available [on my YouTube](https://youtu.be/a8Dhj3Zh9vQ). \n2. Remember to add your credentials and configure nodes (covered in the video guide).\n3. If you like this workflow, please subscribe to [my YouTube channel](https://www.youtube.com/@workfloows) and/or [my newsletter](https://workfloows.com/).\n\n**Thank you for your support!**"
},
"typeVersion": 1
},
{
"id": "4eb67d90-b834-48f6-8d8a-ed0a9d8321fd",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
520,
120
],
"parameters": {
"width": 381.6458068293894,
"height": 313.7892229150129,
"content": "### Generate reply\nTransfer email content to OpenAI Assitant and return AI-generated reply.\n"
},
"typeVersion": 1
},
{
"id": "fdb6e16b-5f42-4872-bf63-b18a14220cdf",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
1160,
120
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Create HTML message\nConvert incoming Markdown from OpenAI Assistant into HTML content."
},
"typeVersion": 1
},
{
"id": "111e4276-7f63-4b11-92be-fd9de7e23f05",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
1400,
120
],
"parameters": {
"width": 461.3148409669012,
"height": 314.75072291501283,
"content": "### Build and encode message\nCreate raw message in RFC standard and encode it into base64 string (please see [Gmail API reference](https://developers.google.com/gmail/api/reference/rest/v1/users.drafts/create) for more details)."
},
"typeVersion": 1
},
{
"id": "0d377266-7fa2-43c4-9259-e8611d52df41",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"position": [
1880,
120
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Insert reply draft\nAdd reply draft from OpenAI Assistant to specific Gmail thread."
},
"typeVersion": 1
},
{
"id": "c743486b-82e0-42f4-bd41-fad6115ac520",
"name": "Sticky Note9",
"type": "n8n-nodes-base.stickyNote",
"position": [
2120,
120
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Remove label\nDelete trigger label from the Gmail thread."
},
"typeVersion": 1
},
{
"id": "dfe99c2e-a8e6-48de-a11d-54adaf98a7fe",
"name": "Sticky Note10",
"type": "n8n-nodes-base.stickyNote",
"position": [
0,
0
],
"parameters": {
"width": 219.88389496558554,
"height": 314.75072291501283,
"content": "### Return message content\nRetrieve content of the last message in the thread."
},
"typeVersion": 1
},
{
"id": "6f228048-4067-494a-af44-080237c2555c",
"name": "Sticky Note11",
"type": "n8n-nodes-base.stickyNote",
"position": [
0,
340
],
"parameters": {
"width": 470.88389496558545,
"height": 314.75072291501283,
"content": "### Get last message from thread\nReturn all messages for a single thread and pass for further processing only the last one."
},
"typeVersion": 1
},
{
"id": "bea0ea14-6198-4022-8ddc-a0c9f895d46e",
"name": "Remove AI label from email",
"type": "n8n-nodes-base.gmail",
"position": [
2180,
260
],
"parameters": {
"resource": "thread",
"threadId": "={{ $('Map fields for further processing').item.json[\"threadId\"] }}",
"operation": "removeLabels"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "dc9b5760-1669-4f29-b28d-73cd417775b4",
"name": "Add email draft to thread",
"type": "n8n-nodes-base.httpRequest",
"position": [
1940,
260
],
"parameters": {
"url": "https://www.googleapis.com/gmail/v1/users/me/drafts",
"method": "POST",
"options": {},
"jsonBody": "={\"message\":{\"raw\":\"{{ $json.encoded }}\", \"threadId\": \"{{ $('Map fields for further processing').item.json[\"threadId\"] }}\"}}",
"sendBody": true,
"specifyBody": "json"
},
"typeVersion": 4.2
},
{
"id": "dbbb607b-701f-49cd-b872-96522abde5b7",
"name": "Convert raw to base64",
"type": "n8n-nodes-base.code",
"position": [
1680,
260
],
"parameters": {
"mode": "runOnceForEachItem",
"jsCode": "const encoded = Buffer.from($json.raw).toString('base64');\n\nreturn { encoded };"
},
"typeVersion": 2
},
{
"id": "9114d833-1c6a-47f1-bc8d-12fb8e17218e",
"name": "Build email raw",
"type": "n8n-nodes-base.set",
"position": [
1480,
260
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "6b6ece46-aeef-4ae5-9a0d-f472e7ced464",
"name": "raw",
"type": "string",
"value": "=To: {{ $json.to }}\nSubject: {{ $json.subject }}\nContent-Type: text/html; charset=\"utf-8\"\n\n{{ $json.response }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "67c1b6ca-d419-45a9-a1d5-2a6ac157454f",
"name": "Convert response to HTML",
"type": "n8n-nodes-base.markdown",
"position": [
1220,
260
],
"parameters": {
"mode": "markdownToHtml",
"options": {},
"markdown": "={{ $json.response }}"
},
"typeVersion": 1
},
{
"id": "97be72d7-20dd-4829-bf1c-f738fb6a8a21",
"name": "Map fields for further processing",
"type": "n8n-nodes-base.set",
"position": [
980,
260
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d5022255-06d2-4322-b51e-ae80b7f6eef6",
"name": "response",
"type": "string",
"value": "={{ $json.output }}"
},
{
"id": "f729def0-3905-4c7d-ad1d-86ef7b001e9c",
"name": "threadId",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"threadId\"] }}"
},
{
"id": "3ef18ad8-7328-4b97-bd6d-9d395a3c4a48",
"name": "to",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"from\"][\"text\"] }}"
},
{
"id": "b013770d-fce2-4030-b372-8d94f04b51e9",
"name": "subject",
"type": "string",
"value": "={{ $('Get single message content').item.json[\"subject\"] }}"
},
{
"id": "69cc71b6-614d-4528-a598-69fbde1b5fd9",
"name": "messageId",
"type": "string",
"value": "={{ $('Get threads with specific labels').item.json[\"id\"] }}"
}
]
}
},
"typeVersion": 3.4
},
{
"id": "545a4296-5307-42ee-8935-2886338e2518",
"name": "Ask OpenAI Assistant",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
580,
260
],
"parameters": {
"text": "={{ $json.text }}",
"prompt": "define",
"options": {},
"resource": "assistant",
"assistantId": {
"__rl": true,
"mode": "list",
"value": "asst_s32wsRpwU1HbLt40wRhghB6Y",
"cachedResultName": "Eva"
}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.8
},
{
"id": "4f326fec-e4bb-42dc-9f26-4a3d8ce86f24",
"name": "Get single message content",
"type": "n8n-nodes-base.gmail",
"position": [
60,
120
],
"parameters": {
"messageId": "={{ $json.id }}",
"operation": "get"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "faeb879f-db00-47b7-8995-9fb9025079cf",
"name": "Return last message in thread",
"type": "n8n-nodes-base.limit",
"position": [
280,
460
],
"parameters": {
"keep": "lastItems"
},
"typeVersion": 1
},
{
"id": "8085cb54-3c85-4450-9e42-825a9d467d6b",
"name": "Get thread messages",
"type": "n8n-nodes-base.gmail",
"position": [
60,
460
],
"parameters": {
"options": {},
"resource": "thread",
"threadId": "={{ $json.id }}",
"operation": "get"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "8a3c1885-8a05-4357-85ea-03cb9e8b24fa",
"name": "Loop over threads",
"type": "n8n-nodes-base.splitInBatches",
"position": [
-200,
260
],
"parameters": {
"options": {}
},
"typeVersion": 3
},
{
"id": "74197fae-823e-47bc-a1c9-b2fbe90b1171",
"name": "Get threads with specific labels",
"type": "n8n-nodes-base.gmail",
"position": [
-460,
260
],
"parameters": {
"filters": {
"labelIds": []
},
"resource": "thread"
},
"credentials": {
"gmailOAuth2": {
"name": "<your credential>"
}
},
"typeVersion": 2.1
},
{
"id": "a3360f69-b8e6-4ef8-933a-352243ab9125",
"name": "Schedule trigger (1 min)",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
-680,
260
],
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 1
}
]
}
},
"typeVersion": 1.2
}
],
"connections": {
"Build email raw": {
"main": [
[
{
"node": "Convert raw to base64",
"type": "main",
"index": 0
}
]
]
},
"Loop over threads": {
"main": [
[
{
"node": "Get single message content",
"type": "main",
"index": 0
}
],
[
{
"node": "Get thread messages",
"type": "main",
"index": 0
}
]
]
},
"Get thread messages": {
"main": [
[
{
"node": "Return last message in thread",
"type": "main",
"index": 0
}
]
]
},
"Ask OpenAI Assistant": {
"main": [
[
{
"node": "Map fields for further processing",
"type": "main",
"index": 0
}
]
]
},
"Convert raw to base64": {
"main": [
[
{
"node": "Add email draft to thread",
"type": "main",
"index": 0
}
]
]
},
"Convert response to HTML": {
"main": [
[
{
"node": "Build email raw",
"type": "main",
"index": 0
}
]
]
},
"Schedule trigger (1 min)": {
"main": [
[
{
"node": "Get threads with specific labels",
"type": "main",
"index": 0
}
]
]
},
"Add email draft to thread": {
"main": [
[
{
"node": "Remove AI label from email",
"type": "main",
"index": 0
}
]
]
},
"Get single message content": {
"main": [
[
{
"node": "Ask OpenAI Assistant",
"type": "main",
"index": 0
}
]
]
},
"Return last message in thread": {
"main": [
[
{
"node": "Loop over threads",
"type": "main",
"index": 0
}
]
]
},
"Get threads with specific labels": {
"main": [
[
{
"node": "Loop over threads",
"type": "main",
"index": 0
}
]
]
},
"Map fields for further processing": {
"main": [
[
{
"node": "Convert response to HTML",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
gmailOAuth2openAiApi
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
How this works
This workflow automates the generation of concise code summaries from your emails, helping developers and technical writers save hours by distilling lengthy code snippets into clear, actionable limits or constraints without manual review. It scans incoming Gmail messages for code-related content, processes them through OpenAI to extract key boundaries, and delivers polished markdown outputs via HTTP requests for easy integration into documentation or reports. The core step involves AI-driven analysis that identifies code limits, ensuring accuracy and relevance for busy teams handling frequent updates.
Use this workflow when managing high volumes of code emails daily, such as in collaborative projects requiring quick constraint extractions, or for automating compliance checks on code boundaries. Avoid it for non-email sources like direct file uploads, where simpler parsing tools suffice, or in low-volume scenarios that don't justify scheduling. Common variations include adapting the cron trigger for real-time processing or swapping OpenAI for custom models to handle domain-specific code languages.
About this workflow
Limit Code. Uses stickyNote, gmail, httpRequest, markdown. Scheduled trigger; 23 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →
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