Automated GitHub PR Code Reviews with GPT-4 & Google Sheets

This n8n workflow streamlines GitHub pull request reviews by triggering on PR creation, fetching code diffs, formatting them into prompts, and leveraging GPT-4 for intelligent analysis. It pulls custom code best practices (e.g., Swift guidelines) from a Google Sheet to ensure reviews align with your team's standards, generating comprehensive feedback on code quality, bugs, and improvements.

Benefits include massive time savings for developers, consistent review quality powered by AI, and visual PR labeling (e.g., ✅ Reviewed by AI) for quick status checks. It reduces manual review bottlenecks, enforces best practices automatically, and scales effortlessly for high-volume repos without hiring more reviewers.

Ideal use cases: Development teams managing multiple repos, open-source projects needing fast feedback, startups accelerating CI/CD pipelines, or enterprises standardizing code reviews across Swift/iOS projects. Prerequisites include GitHub credentials, OpenAI API key, and optional Google Sheets setup for customizable rules.

Setup is straightforward: Import the workflow, configure GitHub trigger for your repo, add OpenAI credentials, link your best practices sheet, and activate. It handles authentication dynamically for seamless PR commenting and labeling.