n8n AI Engineering Dev Ops
Contributed by Sabrina Ramonov 🍄. From the community directory at agents.sabrina.dev, republished with permission and full credit.
AI-Agent Code Review for GitHub Pull Requests
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.
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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
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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.
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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 own Github Repository
- PR Labeler (optional)
- Adds label ReviewedByAI after successful comment
- Node: Add Label to PR
- Label: You can customize the label text of your own 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 database.
- First prepare your best practices list with clear descriptions and the code bad/good examples.
- Add all 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
Tools used: OpenAI, Google Sheets
Download the workflow template (JSON)
Want this running in your business? KOBA42 builds and operates automations like this one.