Automating Code Review with AI: Building a Smart Review Bot

AI as a Code Review Partner

Code review is essential but time-consuming. AI can't replace human reviewers, but it can catch common issues, enforce style guidelines, and free humans to focus on architecture and logic.

Building the Review System

class AICodeReviewer
{
    private string $systemPrompt = <<ai->generate([
            'system' => $this->systemPrompt,
            'user' => $prompt,
        ]);

        return $this->parseReviewResponse($response);
    }
}

GitHub Integration

class GitHubReviewBot
{
    public function handlePullRequest(array $payload): void
    {
        $pr = $payload['pull_request'];
        $diff = $this->github->getPullRequestDiff($pr['number']);

        $review = $this->reviewer->reviewDiff($diff, [
            'title' => $pr['title'],
            'description' => $pr['body'],
        ]);

        // Post review comments
        foreach ($review['comments'] as $comment) {
            $this->github->createReviewComment(
                $pr['number'],
                $comment['body'],
                $comment['path'],
                $comment['line']
            );
        }

        // Post summary
        $this->github->createComment(
            $pr['number'],
            $this->formatSummary($review)
        );
    }
}

Specialized Review Prompts

class ReviewPrompts
{
    public static function security(): string
    {
        return <<

class ReviewLearning
{
    public function recordFeedback(Review $review, string $feedback): void
    {
        ReviewFeedback::create([
            'review_id' => $review->id,
            'original_comment' => $review->comment,
            'feedback' => $feedback,
            'was_helpful' => $feedback === 'helpful',
        ]);
    }

    public function improvePrompt(): string
    {
        $unhelpfulReviews = ReviewFeedback::where('was_helpful', false)
            ->with('review')
            ->limit(50)
            ->get();

        // Use AI to analyze patterns in unhelpful reviews
        return $this->ai->generate([
            'system' => 'Analyze these code review comments that were marked unhelpful. Identify patterns and suggest prompt improvements.',
            'user' => $unhelpfulReviews->toJson(),
        ]);
    }
}