GitLab MR Code Review Bot (en)
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Automate code reviews for GitLab Merge Requests using an LLM.
About This Workflow
This workflow automates the code review process for GitLab Merge Requests (MRs). When a new comment is added to an MR, this workflow triggers an HTTP request to fetch the MR changes, parses the diff, and then uses a large language model (LLM) to generate a code review. Finally, it posts the LLM's review back as a comment on the MR.
Key Features
- Automated MR Review: Triggers on new MR comments to initiate a code review.
- GitLab Integration: Fetches MR details and posts comments directly to GitLab.
- Diff Parsing: Extracts and processes code changes from the MR diff.
- LLM-Powered Analysis: Utilizes a Large Language Model (like OpenAI's GPT) to provide detailed code review feedback.
- Structured Feedback: Generates reviews with a clear decision (accept/reject), score, and suggested improvements.
- Configurable Prompting: Allows customization of the LLM's persona and review instructions.
How To Use
- Setup GitLab Webhook: Configure a webhook in your GitLab project to trigger this workflow on new comments to merge requests. The webhook should be set to POST to your n8n instance's webhook URL.
- Configure Gitlab URL and Token: In the
Get ChangesandPost Discussionsnodes, replace the placeholder GitLab URL and ensure you have a validPRIVATE-TOKENset up (likely as a credential or environment variable). - Customize LLM Prompt: Edit the
Basic LLM Chainnode to define the persona of your review bot and the specific instructions for the LLM. This includes setting the initial system message (e.g., 'You are a senior programming expert Bot...'). - Configure OpenAI Credentials: In the
OpenAI Chat Modelnode, provide your OpenAI API key or select a pre-configured credential. - Test: Create a merge request in your GitLab project and add a comment to trigger the workflow. Monitor the execution in n8n and check the MR for the generated code review.
Apps Used
Workflow JSON
{
"id": "d06e0dd7-c0a5-4688-b2e3-9553a11c7ac7",
"name": "GitLab MR Code Review Bot (en)",
"nodes": 20,
"category": "Code Review",
"status": "active",
"version": "1.0.0"
}Note: This is a sample preview. The full workflow JSON contains node configurations, credentials placeholders, and execution logic.
Get This Workflow
ID: d06e0dd7-c0a5...
About the Author
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