GitLab Merge Request AI Code Reviewer – n8n Automation Template

October 13, 2025

Aladuddin Aladin

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

  • ๐Ÿ”— GitLab Webhook Integration: Automatically triggered on new merge request events.
  • ๐Ÿ“‚ Change Detection: Fetches and parses file diffs from the merge request.
  • ๐Ÿงน Smart Filtering: Skips renamed or deleted files to avoid unnecessary reviews.
  • ๐Ÿง‘โ€๐Ÿ’ป AI-Powered Code Review: Uses OpenAI (configurable model) to provide structured feedback, including acceptance/rejection, scoring (0โ€“100), and suggested improvements.
  • ๐Ÿ“ Inline GitLab Comments: Posts review results as discussions in the merge request, aligned with exact file/line positions.
  • โš™๏ธ Customizable Prompts: Modify review tone, style, or trigger conditions via sticky notes and nodes.
  • ๐Ÿ”’ Secure Setup: Requires your GitLab token and OpenAI API credentials.

About the author

Alauddin Aladin is an AI Automation expert helping businesses streamline operations, boost productivity, and scale effortlessly using tools like Make.com and n8n. With over a decade of experience in digital systems and automation strategy, Alauddin empowers entrepreneurs to save time and grow smarter through intelligent workflows and AI-driven solutions.

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