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PR Auto-Review

AI-powered code review on every pull request.

Quick Start

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

name: PR Auto-Review

on:
  pull_request:
    types: [opened, synchronize, ready_for_review]

permissions:
  contents: read
  pull-requests: write

jobs:
  review:
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          prompt: |
            Review PR #${{ github.event.pull_request.number }}.

            Focus on:
            - Security (injection, validation, secrets)
            - Bugs (edge cases, error handling)
            - Code quality (clarity, maintainability)

            Format findings as:
            🔴 CRITICAL: [must fix]
            🟡 WARNING: [should consider]
            ✅ GOOD: [positive observation]

            Be concise. Only flag high-confidence issues.

How It Works

flowchart LR
    A[PR] --> B{Draft?}
    B -->|Yes| C[Skip]
    B -->|No| D[AI Review]
    D --> E[Post Comment]
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Review Severity

Level Icon Meaning
Critical 🔴 Security risk, crash, data loss - must fix
Warning 🟡 Bug risk, maintainability - should address
Info ℹ️ Suggestion - optional
Good ✅ Positive observation

Options

Option Add to workflow
Inline comments track_progress: true in action inputs
Skip Dependabot if: github.actor != 'dependabot[bot]'
Skip by label if: !contains(github.event.pull_request.labels.*.name, 'skip-review')
Block on critical Check output, exit 1 if CRITICAL found

Troubleshooting

Problem Fix
Review not appearing Check PR not draft, pull-requests: write permission set
Too noisy Add "only flag high-confidence issues" to prompt
Misses issues Increase --max-turns, add project-specific review criteria

Related Patterns