TakatoYamada This workflow corresponds to n8n.io template #15306 — we link there as the canonical source.
This workflow follows the GitHub → HTTP Request recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"id": "AlHVikTKJ41ARefk7-ZTm",
"name": "Automatically review pull requests with AI and post feedback as GitHub comments",
"tags": [
{
"id": "0db9feb574da46e5",
"name": "ai",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "488c1574bb33409a",
"name": "gpt-4",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "62d32ecd261f4fce",
"name": "openai",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "tanWNWkQaVKBvG4h",
"name": "github",
"createdAt": "2026-04-22T22:16:32.332Z",
"updatedAt": "2026-04-22T22:16:32.332Z"
},
{
"id": "929db4748f034b67",
"name": "slack",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "a0291087c4a844c1",
"name": "code-review",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "de8ac33010a74fe5",
"name": "devops",
"createdAt": "2026-04-30T18:38:11.353194Z",
"updatedAt": "2026-04-30T18:38:11.353194Z"
},
{
"id": "xkhvijdyzZQ1znPF",
"name": "automation",
"createdAt": "2026-04-22T22:16:32.341Z",
"updatedAt": "2026-04-22T22:16:32.341Z"
}
],
"nodes": [
{
"id": "2ad2f601-2b50-4ef6-87c2-2cbabc173ed6",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1872,
-64
],
"parameters": {
"width": 480,
"height": 688,
"content": "## Automatically review pull requests with AI and post feedback as GitHub comments\n\n## How it works\n\n1. Initiates on a GitHub pull request event trigger.\n2. Filters pull request events to continue with only 'opened' actions.\n3. Retrieves the pull request diff via HTTP request.\n4. Formats the diff, then uses GPT-4o to automatically review the code.\n5. Generates and posts a comment with the review results on GitHub and sends alerts on Slack based on the review severity.\n\n## Setup steps\n\n- [ ] Configure GitHub credentials for the trigger and comment posting\n- [ ] Set up OpenAI API key for GPT-4o code review\n- [ ] Configure Slack credentials for sending alerts\n\n## Customization\n\nAdjust the sensitivity of severity checks within the conditional branch to customize alert levels."
},
"typeVersion": 1
},
{
"id": "88edd9fe-e658-4879-9a5a-b438c3388964",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1312,
64
],
"parameters": {
"color": 7,
"width": 416,
"height": 304,
"content": "## Trigger and filter PR\n\nStarts the workflow on pull request events and filters for 'opened' status."
},
"typeVersion": 1
},
{
"id": "4c23501c-512b-4155-a280-515efaf148cb",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-864,
64
],
"parameters": {
"color": 7,
"width": 400,
"height": 304,
"content": "## Fetch and format diff\n\nRetrieves the diff of the pull request and formats it for AI analysis."
},
"typeVersion": 1
},
{
"id": "bb95fe03-4409-4e3a-9d12-65136351fcd5",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-432,
80
],
"parameters": {
"color": 7,
"width": 640,
"height": 272,
"content": "## AI review and comment\n\nUses AI to review the code and formulates a GitHub comment."
},
"typeVersion": 1
},
{
"id": "e976ecd2-a43e-45cc-9f08-0312076c835e",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
240,
-64
],
"parameters": {
"color": 7,
"width": 416,
"height": 544,
"content": "## Severity check and alerts\n\nChecks the review severity and sends alerts to Slack."
},
"typeVersion": 1
},
{
"id": "6dac4b91-a5bd-44df-8342-b2eefd358678",
"name": "When PR Opened",
"type": "n8n-nodes-base.githubTrigger",
"position": [
-1264,
192
],
"parameters": {
"owner": "={{ $vars.GITHUB_OWNER }}",
"events": [
"pull_request"
],
"options": {},
"repository": "={{ $vars.GITHUB_REPO }}",
"authentication": "oAuth2"
},
"typeVersion": 1
},
{
"id": "5946aa5f-9949-42ca-adb7-e895e7a740bd",
"name": "Check PR Open",
"type": "n8n-nodes-base.if",
"position": [
-1040,
192
],
"parameters": {
"conditions": {
"string": [
{
"value1": "={{ $json.action }}",
"value2": "opened"
}
]
}
},
"typeVersion": 1
},
{
"id": "24978946-9b3f-4b2f-91f8-2212b6000eb9",
"name": "Fetch PR Diff",
"type": "n8n-nodes-base.httpRequest",
"position": [
-816,
192
],
"parameters": {
"url": "={{ $json.pull_request.diff_url }}",
"options": {
"response": {
"response": {
"responseFormat": "text"
}
}
},
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Accept",
"value": "application/vnd.github.v3.diff"
},
{
"name": "Authorization",
"value": "=Bearer {{ $vars.GITHUB_TOKEN }}"
}
]
}
},
"typeVersion": 4.1
},
{
"id": "e38e529b-bf33-4c31-a36b-cc0346934cbc",
"name": "Format PR Diff",
"type": "n8n-nodes-base.code",
"position": [
-608,
192
],
"parameters": {
"jsCode": "const triggerData = $('When PR Opened').first().json;\nconst diffRaw = $input.first().json.data;\n\nconst MAX_DIFF_CHARS = 12000;\nconst diffStr = typeof diffRaw === 'string' ? diffRaw : JSON.stringify(diffRaw);\nconst diff = diffStr.slice(0, MAX_DIFF_CHARS);\nconst truncated = diffStr.length > MAX_DIFF_CHARS;\n\nreturn [{\n json: {\n diff,\n truncated,\n pr_number: triggerData.number,\n pr_title: triggerData.pull_request.title,\n pr_body: triggerData.pull_request.body || '',\n pr_url: triggerData.pull_request.html_url,\n repo_full_name: triggerData.repository.full_name,\n owner: triggerData.repository.owner.login,\n repo: triggerData.repository.name,\n author: triggerData.pull_request.user.login,\n base_branch: triggerData.pull_request.base.ref,\n head_branch: triggerData.pull_request.head.ref\n }\n}];\n"
},
"typeVersion": 2
},
{
"id": "6f11c0ff-49a8-4323-807d-c6a91a47414a",
"name": "AI Code Review with GPT-4",
"type": "@n8n/n8n-nodes-langchain.openAi",
"position": [
-384,
192
],
"parameters": {
"resource": "chat"
},
"typeVersion": 1.4
},
{
"id": "129f584c-ab65-4bf5-8622-5a57d35bdef5",
"name": "Build Comment for GitHub",
"type": "n8n-nodes-base.code",
"position": [
-160,
192
],
"parameters": {
"jsCode": "const rawContent = $input.first().json.message?.content\n || $input.first().json.choices?.[0]?.message?.content\n || '';\nconst prevData = $('Format PR Diff').first().json;\n\nlet review;\ntry {\n const cleaned = rawContent.replace(/```json|```/g, '').trim();\n review = JSON.parse(cleaned);\n} catch (e) {\n review = {\n severity: 'MEDIUM',\n summary: 'Review parsing failed. Please inspect the raw AI output.',\n issues: [],\n positives: [],\n overall_score: 5\n };\n}\n\nconst severityEmoji = { CRITICAL: '\ud83d\udd34', HIGH: '\ud83d\udfe0', MEDIUM: '\ud83d\udfe1', LOW: '\ud83d\udfe2' };\nconst emoji = severityEmoji[review.severity] || '\u26aa';\n\nlet comment = `## ${emoji} AI Code Review \u2014 Severity: **${review.severity}**\\n\\n`;\ncomment += `**Overall Score:** ${review.overall_score}/10\\n\\n`;\ncomment += `### \ud83d\udccb Summary\\n${review.summary}\\n\\n`;\n\nif (review.issues && review.issues.length > 0) {\n comment += `### \ud83d\udea8 Issues (${review.issues.length})\\n\\n`;\n for (const issue of review.issues) {\n const ie = severityEmoji[issue.severity] || '\u26aa';\n comment += `<details>\\n<summary>${ie} [${issue.severity}] ${issue.category?.toUpperCase()} \u2014 ${issue.file}${issue.line ? ` (line ${issue.line})` : ''}</summary>\\n\\n`;\n comment += `**Issue:** ${issue.description}\\n\\n**Suggestion:** ${issue.suggestion}\\n\\n</details>\\n\\n`;\n }\n}\n\nif (review.positives && review.positives.length > 0) {\n comment += `### \u2705 Positives\\n`;\n review.positives.forEach(p => { comment += `- ${p}\\n`; });\n comment += '\\n';\n}\n\ncomment += `---\\n*Reviewed by GPT-4o via n8n \u00b7 [View PR](${prevData.pr_url})*`;\n\nreturn [{\n json: {\n ...prevData,\n review,\n comment_body: comment,\n is_critical: review.severity === 'CRITICAL',\n severity: review.severity,\n score: review.overall_score\n }\n}];\n"
},
"typeVersion": 2
},
{
"id": "adebde26-84a2-4675-b007-022f8824722d",
"name": "Post Comment to GitHub",
"type": "n8n-nodes-base.github",
"position": [
64,
192
],
"parameters": {
"body": "={{ $json.comment_body }}",
"owner": "={{ $json.owner }}",
"operation": "createComment",
"repository": "={{ $json.repo }}",
"issueNumber": "={{ $json.pr_number }}",
"authentication": "oAuth2"
},
"typeVersion": 1
},
{
"id": "9eca81e5-4a04-4268-86be-c2d45ee95734",
"name": "Check Critical Severity",
"type": "n8n-nodes-base.if",
"position": [
288,
192
],
"parameters": {
"conditions": {
"boolean": [
{
"value1": "={{ $('Build Comment for GitHub').first().json.is_critical }}",
"value2": true
}
]
}
},
"typeVersion": 1
},
{
"id": "2adfd0d1-0e9b-4e21-81ba-80a5e11230a7",
"name": "Alert Critical Issues to Slack",
"type": "n8n-nodes-base.slack",
"position": [
512,
64
],
"parameters": {
"text": "=\ud83d\udea8 *CRITICAL code review alert*\n\n*PR:* <{{ $('Build Comment for GitHub').first().json.pr_url }}|#{{ $('Build Comment for GitHub').first().json.pr_number }} \u2014 {{ $('Build Comment for GitHub').first().json.pr_title }}>\n*Author:* `{{ $('Build Comment for GitHub').first().json.author }}`\n*Repo:* `{{ $('Build Comment for GitHub').first().json.repo_full_name }}`\n*Score:* {{ $('Build Comment for GitHub').first().json.score }}/10\n\n*Summary:*\n{{ $('Build Comment for GitHub').first().json.review.summary }}\n\n\u26a0\ufe0f Immediate review required before merge.",
"otherOptions": {
"unfurl_links": false
},
"authentication": "oAuth2"
},
"typeVersion": 2.1
},
{
"id": "316f8c82-6e75-480b-a867-93782a25fe4f",
"name": "Share Review Summary on Slack",
"type": "n8n-nodes-base.slack",
"position": [
512,
304
],
"parameters": {
"text": "=\u2705 *PR review completed*\n\n*PR:* <{{ $('Build Comment for GitHub').first().json.pr_url }}|#{{ $('Build Comment for GitHub').first().json.pr_number }} \u2014 {{ $('Build Comment for GitHub').first().json.pr_title }}>\n*Author:* `{{ $('Build Comment for GitHub').first().json.author }}`\n*Severity:* {{ $('Build Comment for GitHub').first().json.severity }}\n*Score:* {{ $('Build Comment for GitHub').first().json.score }}/10\n\nAI review comment has been posted to the PR.",
"otherOptions": {
"unfurl_links": false
},
"authentication": "oAuth2"
},
"typeVersion": 2.1
}
],
"active": false,
"settings": {
"availableInMCP": false,
"executionOrder": "v1"
},
"versionId": "51911461-f6f6-46ca-ad91-d10d36d33f9b",
"connections": {
"Check PR Open": {
"main": [
[
{
"node": "Fetch PR Diff",
"type": "main",
"index": 0
}
]
]
},
"Fetch PR Diff": {
"main": [
[
{
"node": "Format PR Diff",
"type": "main",
"index": 0
}
]
]
},
"Format PR Diff": {
"main": [
[
{
"node": "AI Code Review with GPT-4",
"type": "main",
"index": 0
}
]
]
},
"When PR Opened": {
"main": [
[
{
"node": "Check PR Open",
"type": "main",
"index": 0
}
]
]
},
"Post Comment to GitHub": {
"main": [
[
{
"node": "Check Critical Severity",
"type": "main",
"index": 0
}
]
]
},
"Check Critical Severity": {
"main": [
[
{
"node": "Alert Critical Issues to Slack",
"type": "main",
"index": 0
}
],
[
{
"node": "Share Review Summary on Slack",
"type": "main",
"index": 0
}
]
]
},
"Build Comment for GitHub": {
"main": [
[
{
"node": "Post Comment to GitHub",
"type": "main",
"index": 0
}
]
]
},
"AI Code Review with GPT-4": {
"main": [
[
{
"node": "Build Comment for GitHub",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
Engineering teams, code reviewers, and tech leads who want to automate code review feedback. Ideal for repositories with high PR volume where consistent first-pass review is valuable.
Source: https://n8n.io/workflows/15306/ — original creator credit. Request a take-down →
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