This workflow follows the Agent → Google Sheets Tool 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 →
{
"id": "AMQub0Da16qevkJS",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Code Review workflow",
"tags": [],
"nodes": [
{
"id": "62ef8e9f-df1a-46dd-b025-a206ac888f97",
"name": "OpenAI Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"position": [
-100,
140
],
"parameters": {
"model": {
"__rl": true,
"mode": "list",
"value": "gpt-4o-mini"
},
"options": {}
},
"credentials": {
"openAiApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.2
},
{
"id": "35361983-8c66-457e-8cb6-7585a18f8aaf",
"name": "PR Trigger",
"type": "n8n-nodes-base.githubTrigger",
"position": [
-740,
-80
],
"parameters": {
"owner": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"events": [
"pull_request"
],
"options": {},
"repository": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"authentication": "oAuth2"
},
"credentials": {
"githubOAuth2Api": {
"name": "<your credential>"
}
},
"notesInFlow": false,
"typeVersion": 1
},
{
"id": "25d17a0d-c409-406d-bd97-00ec71261c16",
"name": "Get file's Diffs from PR",
"type": "n8n-nodes-base.httpRequest",
"position": [
-520,
-80
],
"parameters": {
"url": "=https://api.github.com/repos/{{$json.body.sender.login}}/{{$json.body.repository.name}}/pulls/{{$json.body.number}}/files",
"options": {}
},
"typeVersion": 4.2
},
{
"id": "f984f872-c4b0-4752-bc54-1f311fa36feb",
"name": "Create target Prompt from PR Diffs",
"type": "n8n-nodes-base.code",
"position": [
-300,
-80
],
"parameters": {
"jsCode": "const files = $input.all().map(item => item.json);\n\nlet diffs = '';\n\nfor (const file of files) {\n diffs += `### Fichier : ${file.filename}\\n\\n`;\n\n if (file.patch) {\n // IMPORTANT : On remplace tous les triple backticks par simple (ou \u00e9chappement)\n const safePatch = file.patch.replace(/```/g, \"''\");\n\n diffs += \"```diff\\n\";\n diffs += safePatch;\n diffs += \"\\n```\\n\";\n } else {\n diffs += \"_Pas de patch disponible (probablement fichier binaire)._\";\n }\n\n diffs += \"\\n---\\n\\n\";\n}\n\nconst userMessage = `\nYou are a senior iOS developer. \nPlease review the following code changes in these files :\n\n${diffs}\n\n---\n\nYour mission:\n\n- Review the proposed code changes file by file and by significant modification.\n\n- Generate inline comments on the relevant lines of code.\n\n- Ignore files without patches.\n\n- Do not repeat the code snippet or the filename.\n\n- Write the comments directly, without introducing the context.\n`;\n\nreturn [\n {\n json: {\n user_message: userMessage.trim()\n }\n }\n];"
},
"typeVersion": 2
},
{
"id": "0d9790b1-9818-4e73-a202-57d4db039b35",
"name": "GitHub Robot",
"type": "n8n-nodes-base.github",
"position": [
296,
-80
],
"parameters": {
"body": "={{ $json.output }}",
"event": "comment",
"owner": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"resource": "review",
"repository": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"additionalFields": {},
"pullRequestNumber": "={{ $('PR Trigger').first().json.body.number }}"
},
"credentials": {
"githubApi": {
"name": "<your credential>"
}
},
"typeVersion": 1.1
},
{
"id": "234c235c-a88d-412b-b7b1-f9f0cc8eead9",
"name": "Add Label to PR",
"type": "n8n-nodes-base.github",
"position": [
516,
-80
],
"parameters": {
"owner": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"operation": "edit",
"editFields": {
"labels": [
{
"label": "ReviewedByAI"
}
]
},
"repository": {
"__rl": true,
"mode": "list",
"value": "",
"cachedResultUrl": "",
"cachedResultName": ""
},
"issueNumber": "={{ $('PR Trigger').first().json.body.number }}",
"authentication": "oAuth2"
},
"credentials": {
"githubOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 1
},
{
"id": "34d9842f-928e-4d19-9d91-336c85f53485",
"name": "Code Best Practices",
"type": "n8n-nodes-base.googleSheetsTool",
"position": [
68,
140
],
"parameters": {
"options": {},
"sheetName": {
"__rl": true,
"mode": "name",
"value": ""
},
"documentId": {
"__rl": true,
"mode": "url",
"value": ""
}
},
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 4.5
},
{
"id": "ab6c0b9d-1c76-448c-896e-7fdb15365b72",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-880,
-260
],
"parameters": {
"content": "**1-The GitHub Trigger** node initiates the workflow whenever a pull request event occurs on a specified repository. It enables real-time automation based on GitHub activity.\n"
},
"typeVersion": 1
},
{
"id": "27752afa-4d97-4e23-be58-6171b5e17f1b",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-680,
100
],
"parameters": {
"color": 3,
"width": 340,
"height": 220,
"content": "**2-Get PR Diffs**\nThe HTTP Request node fetches the list of changed files and their diffs from the pull request that triggered the workflow. It uses the GitHub REST API to retrieve this data dynamically based on the trigger payload.\n\nhttps://api.github.com/repos/{{$json.body.sender.login}}/{{$json.body.repository.name}}/pulls/{{$json.body.number}}/files"
},
"typeVersion": 1
},
{
"id": "c201133c-3d54-4fe0-8442-11ff92dcc89e",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-420,
-340
],
"parameters": {
"color": 2,
"width": 360,
"height": 240,
"content": "**3-Create Prompt from diffs**\nThis Code node runs a JavaScript snippet to:\n-Parse file diffs from the previous HTTP Request node\n-Format each diff with its file name\n-Build a structured natural language prompt for the AI agent\n\nThe final output is a clear, contextual instruction like:\n*\"You are a senior iOS developer. Please review the following code changes in these files...\"*\n"
},
"typeVersion": 1
},
{
"id": "6f6c78b2-ad75-43fa-a082-9f345f9b5f30",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
200,
-260
],
"parameters": {
"color": 5,
"content": "**Github Comment Poster**\nPosts the AI-generated review as a comment on the pull request using GitHub API."
},
"typeVersion": 1
},
{
"id": "ac7b6754-2bef-408d-8f53-fb51ece1673e",
"name": "Code Review Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
-80,
-80
],
"parameters": {
"text": "={{ $json.user_message }}",
"options": {},
"promptType": "define"
},
"typeVersion": 1.9
},
{
"id": "30655e04-f429-40bb-b6b7-9a11ffa4e607",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
460,
-220
],
"parameters": {
"color": 7,
"height": 120,
"content": "**PR Labeler (optional)**\nAutomatically adds a label like *ReviewedByAI* to the pull request once the AI comment is posted."
},
"typeVersion": 1
},
{
"id": "76fbb269-e7ce-4d8a-a609-a5ab454258d8",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
180,
120
],
"parameters": {
"color": 6,
"width": 260,
"content": "**Google Sheet Best Practices**\nEnables the AI agent to reference to your team coding guidelines stored in a Google Sheet for more accurate and opinionated reviews.\nYou can replace Google Sheets with any other database or tool."
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "9d1650b2-38a1-40bf-ad65-1902f069a06f",
"connections": {
"PR Trigger": {
"main": [
[
{
"node": "Get file's Diffs from PR",
"type": "main",
"index": 0
}
]
]
},
"GitHub Robot": {
"main": [
[
{
"node": "Add Label to PR",
"type": "main",
"index": 0
}
]
]
},
"Code Review Agent": {
"main": [
[
{
"node": "GitHub Robot",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "Code Review Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Code Best Practices": {
"ai_tool": [
[
{
"node": "Code Review Agent",
"type": "ai_tool",
"index": 0
}
]
]
},
"Get file's Diffs from PR": {
"main": [
[
{
"node": "Create target Prompt from PR Diffs",
"type": "main",
"index": 0
}
]
]
},
"Create target Prompt from PR Diffs": {
"main": [
[
{
"node": "Code Review Agent",
"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.
githubApigithubOAuth2ApigoogleSheetsOAuth2ApiopenAiApi
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How this works
This workflow automates code reviews for pull requests, saving developers hours of manual scrutiny by leveraging AI to analyse changes and suggest improvements. It is ideal for engineering teams using GitHub who want consistent, rapid feedback on code quality without slowing down their release cycles. The key step involves the OpenAI Chat Model processing the pull request diffs retrieved via HTTP Request, generating a detailed review that includes best practices pulled from a Google Sheets reference, before applying labels through GitHub integration.
Use this workflow when your team handles frequent pull requests and needs AI-assisted reviews to enforce coding standards efficiently. Avoid it for very large codebases where custom analysis might require more specialised tools, or if your repository isn't on GitHub. Common variations include adding notifications to Slack for review summaries or integrating with Jira to link issues directly from the AI output.
About this workflow
Code Review workflow. Uses lmChatOpenAi, githubTrigger, httpRequest, github. Event-driven trigger; 14 nodes.
Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →
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