Ask an AI to review your code

Description

🤖 Automate GitLab Code Reviews using GPT-4

Get instant AI-powered feedback on GitLab Merge Requests — just comment +0 and let GPT-4 handle the review!

✋ Stop wasting time manually reading every file change — this workflow listens to GitLab comments, fetches diffs, analyzes them with GPT-4, and posts intelligent feedback directly in your PR discussion.

🧠 What Problem Does It Solve?

Manual code reviews can be slow, biased, or inconsistent

This AI-enhanced workflow ensures every PR gets

✅ Instant review upon trigger comment

🧠 Smart feedback using GPT-4

🔄 Continuous feedback loop via comments

🔍 Focus on relevant code changes only

⚙️ How It Works

📩 Listens to GitLab PR comments (e.g., +0) via webhook

🔍 Filters comments using your custom trigger words

🌐 Fetches file changes from the PR using GitLab API

📦 Splits and filters the file changes intelligently

🧪 Extracts and parses the last diff line for context

🧠 Sends code changes to GPT-4 using custom prompt

📝 Posts the AI’s review back to the GitLab PR discussion

✨ Key Features

💬 Trigger reviews with a simple comment (+0, customizable)

🔐 Works with your GitLab repo URL and token

🧠 Powered by OpenAI ChatGPT (GPT-4)

🧩 Fully editable prompts — tailor GPT feedback to your project style

🚀 Responds instantly within the PR discussion

📂 Skips unwanted files and comments automatically

🔧 What You Need

✅ GitLab project with Merge Requests enabled

✅ GitLab Access Token with read/write privileges

✅ GitLab webhook for note_events (for PR comments)

✅ OpenAI API key for GPT-4 access

✅ n8n instance to run the workflow

🛠️ Setup Instructions

🧷 Add GitLab webhook to trigger on note_events

🔐 Insert your GitLab URL and Access Token in workflow nodes

✍️ Customize the trigger word (default is +0)

💬 Define your preferred GPT prompt for reviews

🤖 Connect OpenAI GPT-4 node with your API key

🧪 Test with sample PR before scaling

🔗 Integrations

GitLab

OpenAI GPT-4

n8n Core Nodes