Building a Claude-Powered Code Reviewer: Automated PR Reviews With GitHub Actions

Automated code review catches the bugs your eyes skip over after the 8th hour of staring at the same PR. Claude is exceptional at this -- here's how to wire it into GitHub Actions. What Claude Reviews With proper prompting, Claude catches: Logic errors and edge cases Security vulnerabilities (SQL injection, XSS, exposed secrets) Missing error handling Type safety issues Performance problems (N+1 queries, missing indexes) Violations of your codebase conventions It doesn't replace human review -- it catches the mechanical stuff so humans can focus on architecture and intent. GitHub Actions Setup # .github/workflows/code-review.yml name: Claude Code Review on: pull_request: types: [opened, synchronize] jobs: review: runs-on: ubuntu-latest permissions: pull-requests: write contents: read steps: - uses: actions/checkout@v4 with: fetch-depth: 0 - uses: actions/setup-node@v4 with: node-version: '20' - name: Run Claude Review env: ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }} GITHUB_TOKE