Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

AI Agent Code Review for GitHub Pull Requests Description: This n8n workflow automates the process of reviewing code changes in GitHub pull requests using an OpenAI powered agent. It connects your ...

Best for

DevOps automation workflows
AI Summarization automation workflows
intermediate n8n builders looking for reusable templates

Tools used

@n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.githubtrigger, n8n-nodes-base.httprequest, n8n-nodes-base.code, n8n-nodes-base.github, n8n-nodes-base.googlesheetstool, n8n-nodes-base.stickynote, @n8n/n8n-nodes-langchain.agent

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Jihene.

Original n8n.io source

1.1 Workflow description

Title: Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices
Workflow name: Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices

AI-Agent Code Review for GitHub Pull Requests

Description:

This n8n workflow automates the process of reviewing code changes in GitHub pull requests using an OpenAI-powered agent.

It connects your GitHub repo, extracts modified files, analyzes diffs, and uses an AI agent to generate a code review based on your internal code best practices (fed from a Google Sheet).

It ends by posting the review as a comment on the PR and tagging it with a visual label like ✅ Reviewed by AI.

🔧 What It Does

Triggered on PR creation
Extracts code diffs from the PR
Formats and feeds them into an OpenAI prompt
Enriches the prompt using a Google Sheet of Swift best practices
Posts an AI-generated review as a comment on the PR
Applies a PR label to visually mark reviewed PRs

✅ Prerequisites

Before deploying this workflow, ensure you have the following:

n8n Instance (Self-hosted or Cloud)
GitHub Repository with PR activity
OpenAI API Key for GPT-4o, GPT-4-turbo, or GPT-3.5
GitHub OAuth App (or PAT) connected to n8n to post comments and access PR diffs
(Optional) Google Sheets API credentials if using the code best practices lookup node.

⚙️ Setup Instructions

1. Import the Workflow in n8n, click on Workflows → Import from file or JSON Paste or upload the JSON code of this template

2. Configure Triggers and Connections

🔁 GitHub Trigger

Node: PR Trigger
Repository: Select the GitHub repo(s) to monitor
Events: Set to pull_request
Auth: Use GitHub OAuth2 credentials

📥 HTTP Request

Node: Get file's Diffs from PR

No authentication needed; it uses dynamic path from trigger

🧠 OpenAI Model

Node: OpenAI Chat Model
Model: Select gpt-4o, gpt-4-turbo, or gpt-3.5-turbo
Credential: Provide your OpenAI API Key

🧑‍💻 Code Review Agent

Node : Code Review Agent Connected to OpenAI and optionally to tools like Google Sheets

💬 GitHub Comment Poster

Uses GitHub API to post review comments back on PR Node: GitHub Robot Credential: Use the agent Github account (OAuth or PAT) Repo : Pick your owen Github Repository

🏷️ PR Labeler (optional)

Adds label ReviewedByAI after successful comment

Node: Add Label to PR Label : you ca customize the label text of your owen tag.

📊 Google Sheet Best Practices config (optional)

Connects to a Google Sheet for coding guideline lookups, we can replace Google sheet by another tool or data base

First prepare your best practices list with the clear description and the code bad/good examples
Add al the best practices in your Google Sheet
Configure the Code Best Practices node in the template :

Credential : Use your Google Sheet account by OAuth2

URL : Add your Google Sheet document URL

Sheet : Add the name of the best practices sheet

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - OpenAI Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 2 - PR Trigger

Type / Role: n8n-nodes-base.githubTrigger - githubTrigger
Config choices: Version 1

Block 3 - Get file's Diffs from PR

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 4 - Create target Prompt from PR Diffs

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 5 - GitHub Robot

Type / Role: n8n-nodes-base.github - github
Config choices: Version 1.1

Block 6 - Add Label to PR

Type / Role: n8n-nodes-base.github - github
Config choices: Version 1

Block 7 - Code Best Practices

Type / Role: n8n-nodes-base.googleSheetsTool - googleSheetsTool
Config choices: Version 4.5

Block 8 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 9 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 10 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 12 - Code Review Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.9

Block 13 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 14 - Sticky Note5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices
Complexity	intermediate
Nodes	14
Categories	DevOps, AI Summarization
Author	Jihene
Published	30 Apr 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/3804/3804.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source DevOps workflows AI Summarization workflows

Frequently asked questions

What does Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your DevOps, AI Summarization use case.

Jihene

1 workflow

Nodes

@n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.githubtrigger n8n-nodes-base.httprequest n8n-nodes-base.code n8n-nodes-base.github n8n-nodes-base.googlesheetstool n8n-nodes-base.stickynote @n8n/n8n-nodes-langchain.agent

Complexity

intermediate

Published 30 Apr 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/3804/3804.json

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Automated PR code reviews with GitHub, GPT-4, and Google Sheets best practices

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Description:

✅ Prerequisites

⚙️ Setup Instructions

🔁 GitHub Trigger

📥 HTTP Request

🧠 OpenAI Model

🧑‍💻 Code Review Agent

💬 GitHub Comment Poster

🏷️ PR Labeler (optional)

📊 Google Sheet Best Practices config (optional)

Credential : Use your Google Sheet account by OAuth2

URL : Add your Google Sheet document URL

Sheet : Add the name of the best practices sheet

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - OpenAI Chat Model

Block 2 - PR Trigger

Block 3 - Get file's Diffs from PR

Block 4 - Create target Prompt from PR Diffs

Block 5 - GitHub Robot

Block 6 - Add Label to PR

Block 7 - Code Best Practices

Block 8 - Sticky Note

Block 9 - Sticky Note1

Block 10 - Sticky Note2

Block 11 - Sticky Note3

Block 12 - Code Review Agent

Block 13 - Sticky Note4

Block 14 - Sticky Note5

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions