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Integrating Claude Code with GitHub Actions for AI-Powered Code Reviews

22/37
Chapter 4 Integration with Visual Studio Code and GitHub

Integrating Claude Code with GitHub Actions for AI-Powered Code Reviews

5 min read Lesson 22 / 37 Preview

Integrating Claude Code with GitHub Actions for AI-Powered Code Reviews

Automated code reviews are one of the highest-value Claude Code integrations. Every pull request gets a thorough review before human reviewers even look at it.

Creating the Review Workflow

> Create a GitHub Actions workflow at .github/workflows/claude-review.yml
> that triggers on pull request events (opened, synchronize). The
> workflow should:
> 1. Check out the code
> 2. Install Claude Code
> 3. Run Claude to review the diff between the PR branch and main
> 4. Post the review as a PR comment
> Use the ANTHROPIC_API_KEY secret for authentication.

The Workflow File

Claude Code should generate something like:

name: Claude Code Review
on:
  pull_request:
    types: [opened, synchronize]

permissions:
  contents: read
  pull-requests: write

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - uses: actions/setup-node@v4
        with:
          node-version: '22'

      - name: Install Claude Code
        run: npm install -g @anthropic-ai/claude-code

      - name: Review PR
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          DIFF=$(git diff origin/main...HEAD)
          claude --print "Review this code diff for bugs, security issues, performance problems, and style inconsistencies. Be specific and actionable: $DIFF" > review.md

      - name: Post Review Comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const review = fs.readFileSync('review.md', 'utf8');
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `## 🤖 Claude Code Review\n\n${review}`
            });

Testing the Review Workflow

  1. Create a new branch: git checkout -b test/review-workflow
  2. Make a deliberate code change (add a feature or introduce a style issue)
  3. Push and create a PR: gh pr create --title "Test AI review" --body "Testing automated review"
  4. Wait for the GitHub Actions workflow to complete
  5. Check the PR comments for Claude's review

What Claude Reviews

The automated review checks for:

  • Bugs — Null references, off-by-one errors, race conditions
  • Security — SQL injection, XSS, hardcoded secrets
  • Performance — N+1 queries, unnecessary re-renders, memory leaks
  • Style — Naming conventions, code organization, documentation gaps
  • Best practices — Error handling, input validation, testing coverage

Key Takeaways

  • Automated PR reviews catch issues before human review
  • The workflow triggers on every PR creation and update
  • Claude reviews diffs specifically, focusing on what changed
  • Post reviews as PR comments for easy team visibility
  • This workflow saves significant time in code review cycles