Originally published at claudeguide.io/automated-code-review-claude

Automated Code Review with Claude: Setup and Workflow

Automated code review with Claude runs on every PR, flags issues before human review, and posts specific inline comments on the diff. The setup: a GitHub Action that triggers on pull requests, extracts the diff, sends it to Claude with a focused review prompt, and posts the response as a PR comment. This takes about 30 minutes to set up and catches real bugs — particularly security issues, missing error handling, and edge cases that manual review often misses.

---

GitHub Actions workflow

Create .github/workflows/code-review.yml:

yaml
name: Claude Code Review

on:
  pull_request:
    types: [opened, synchronize]

permissions:
  pull-requests: write
  contents: read

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Full history for better diff

      - name: Get diff
        id: diff
        run: |
          git diff origin/${{ github.base_ref }}...HEAD -- \
            '*.py' '*.ts' '*.tsx' '*.js' '*.go' \


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