GitLab Merge Request AI Code Reviewer - n8n Automation Template

Automate GitLab merge request reviews with AI. This workflow listens for merge request events via a GitLab webhook, retrieves code changes, and sends them to an AI model for review. The AI analyzes the diffs, provides acceptance/rejection decisions, assigns a score, and posts structured feedback directly back into the GitLab merge request discussion.

This template helps teams improve code quality, streamline reviews, and get actionable AI-driven recommendations without manual effort.

Features

• 🔗 GitLab Webhook Integration: Automatically triggered on new merge request events.
• 📂 Change Detection: Fetches and parses file diffs from the merge request.
• 🧹 Smart Filtering: Skips renamed or deleted files to avoid unnecessary reviews.
• 🧑‍💻 AI-Powered Code Review: Uses OpenAI (configurable model) to provide structured feedback, including acceptance/rejection, scoring (0–100), and suggested improvements.
• 📝 Inline GitLab Comments: Posts review results as discussions in the merge request, aligned with exact file/line positions.
• ⚙️ Customizable Prompts: Modify review tone, style, or trigger conditions via sticky notes and nodes.
• 🔒 Secure Setup: Requires your GitLab token and OpenAI API credentials.