Automated Code Review with AI GitHub: Setup Guide 2025

Understanding the Review Bottleneck

Code review has traditionally been a verification constraint, with teams waiting days for feedback on pull requests. According to the 2025 GitHub Octoverse report, the volume of merged pull requests increased by 29% year-over-year, driven largely by the widespread adoption of AI coding assistants—but the verification bottleneck remains, making review the critical constraint in the delivery pipeline.

AI code reviews use machine learning and natural language processing models to analyze, review, and provide feedback on code, learning patterns, best practices, and common pitfalls across various programming languages and frameworks. Setting up automated code review with AI in GitHub is no longer optional for teams wanting to scale; it's becoming essential infrastructure.

Understanding Your Setup Options

Before diving into specific tools, understand that GitHub Actions are CI/CD jobs defined in YAML workflow files inside your repository at .github/workflows/, run on GitHub-hosted or self-hosted runners, and are triggered by events like pull_request or push. GitHub Apps are external applications that integrate with GitHub through its API, are installed at the organization or repository level through GitHub's marketplace, do not consume your Actions minutes, do not require YAML configuration files, and run on the tool vendor's infrastructure.

Tools like CodeAnt AI, CodeRabbit, Codacy, and DeepSource operate as GitHub Apps, while tools like PR-Agent, Semgrep, and SonarQube run as GitHub Actions.

Option 1: GitHub Copilot Code Review

GitHub Copilot code review reached general availability in April 2025 after surpassing one million developers in preview.

Prerequisites

Copilot must be enabled for your organization on Business and Enterprise plans, though individual Pro subscribers can use code review on their personal repositories without additional setup.

Organization-Level Setup

For Copilot Business and Enterprise plans:

1. Navigate to your GitHub organization's Settings page, go to Copilot in the left sidebar, then select Policies. Under the Code review section, set the policy to Enabled for all members, or configure it for specific teams.
2. Optionally, set a premium request spending limit to control costs from code review usage.

Repository Configuration

On GitHub, navigate to the main page of the repository, click Settings under your repository name, and in the sidebar under