Claude Code Review: Automate Your Code Reviews with AI

What is the Code Review Plugin?

The Code Review plugin automates pull request reviews using 5 specialized agents working in parallel. Unlike a single manual review pass, each agent analyzes your changes from a different angle, then a confidence scoring system filters results to only surface relevant issues.

The 5 Specialized Reviewers

Confidence Scoring System

Each finding receives a score from 0 to 100:

• →80-100 (High confidence) → Posted as GitHub comment ✅
• →50-79 (Medium confidence) → Visible in logs, not posted
• →0-49 (Low confidence) → Filtered silently

The honest read on AI code review, based on a year of experience reports on r/ExperiencedDevs and r/programming: it is excellent at the mechanical layer (unused imports, obvious null-deref, missing error handling, inconsistent naming) and mediocre at the architectural layer (is this abstraction justified? does this coupling hurt us long-term?). Teams that deploy the Code Review plugin as a supplement to human review ship faster; teams that deploy it as a replacement ship more bugs, they just ship them with a confidence score attached.

What the community correctly insists on: calibrate the threshold to your team's noise tolerance, not to a marketing default. A threshold of 80 sounds "high confidence" but in a large PR it still produces enough findings that reviewers start skimming — and a skimmed review is worse than no review at all. Engineers on r/github have documented that automated review comments become invisible once volume crosses ~5 per PR, which is a pattern the GitHub research on PR review fatigue backs up.

The pragmatic pattern: start with threshold 90, triage the first week, then lower only if you are missing real classes of bugs. And keep the plugin in "suggest" mode (not "block merge") for at least a sprint. An automated gate that blocks on a false positive burns trust much faster than a missed real positive.

Installation and Configuration

Prerequisites

• →Claude Code installed and configured (installation guide)
• →Active GitHub authentication (the plugin uses your existing token)
• →A repository with open pull requests

Installation

# In Claude Code, run:
/install code-review

# Verify installation:
/plugins list

The plugin appears as code-review with the "Anthropic Verified" badge ✓

First Review

# Switch to a PR branch
git checkout feature/my-new-feature

# Run the full review
/code-review

Advanced Configuration

Customize the Confidence Threshold

# Default threshold: 80
/code-review --threshold 80

# Strict threshold: only obvious issues
/code-review --threshold 90

# Relaxed threshold: more feedback, potentially more noise
/code-review --threshold 60

# Minimal threshold: see almost everything
/code-review --threshold 40

Priority Domains

# Security focus (ideal for audits)
/code-review --focus security

# Performance focus
/code-review --focus performance

# Accessibility focus
/code-review --focus accessibility

# Combination
/code-review --focus security,performance

Intelligent PR Filtering

The plugin automatically skips PRs that don't need review:

GitHub Comment Format

Each comment posted to GitHub includes:

• →Direct link to the relevant code (full SHA + line range)
• →Confidence score of the finding
• →Source agent (which reviewer detected the issue)
• →Fix suggestion when applicable

## 🔍 Code Review Finding (Confidence: 95/100)

**Agent:** Bug Detector
**File:** src/auth/login.ts#L42-L48

### Issue: Potential SQL injection vulnerability

The user input `username` is interpolated directly into the SQL query
without parameterization.

**Current code:**
```ts
const result = await db.query(`SELECT * FROM users WHERE name = '${username}'`);

Suggested fix:

const result = await db.query('SELECT * FROM users WHERE name = $1', [username]);

Posted by Claude Code Review Plugin v2.1.0

---

## Comparison with Alternatives

<ComparisonTable
  title="Code Review: Claude Plugin vs Alternatives"
  headers={["Feature", "Claude Code Review", "GitHub Copilot PR Review", "CodeRabbit", "Manual Review"]}
  rows={[
    ["Parallel agents", "5 specialized agents", "1 single model", "Sequential analysis", "1-2 reviewers"],
    ["Confidence scoring", "0-100 per finding", "No", "Severity (low/med/high)", "Subjective"],
    ["CLAUDE.md context", "✅ Yes", "❌ No", "❌ No", "If reviewer knows it"],
    ["Git history analysis", "✅ Deep", "⚠️ Limited", "✅ Yes", "Depends on reviewer"],
    ["False positives", "Very low (threshold 80)", "Moderate", "Moderate", "Low"],
    ["Review time", "~2-5 min per PR", "~1-3 min", "~3-5 min", "15-60 min"],
    ["Customization", "Threshold + focus areas", "Limited", "YAML rules", "Unlimited"],
    ["Price", "Included with Claude Code", "Included with Copilot", "Free open-source / paid", "Developer time"],
    ["CI/CD integration", "Via GitHub Actions", "Native GitHub", "GitHub App", "N/A"]
  ]}
  highlightColumn={1}
/>

---

## CI/CD Integration with GitHub Actions

Combine the Code Review plugin with [GitHub Actions](claude-github-integration-guide) for automatic review on every PR:

```yaml
# .github/workflows/claude-code-review.yml
name: Claude Code Review
on:
  pull_request:
    types: [opened, synchronize]

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

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

      - name: Run Code Review
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          claude-code --plugin code-review \
            --threshold 80 \
            --focus security,performance

Best Practices

Optimizing Review Quality

1. →

   Keep your CLAUDE.md up to date, The compliance agent can only check what's documented. The more precise your CLAUDE.md, the more relevant the reviews.

2. →

   Adjust the threshold per project, Critical projects (fintech, healthcare) deserve a threshold of 60-70. Internal projects can stay at 80-90.

3. →

   Use --focus for audits, Before a security audit, run /code-review --focus security --threshold 50 on recent PRs.

4. →

   Combine with human review, The plugin doesn't replace human reviews. Use it as a first pass to catch obvious issues and free up time for architectural review.

Recommended Team Workflow

Developer pushes → PR opened
     ↓
GitHub Action triggers /code-review
     ↓
5 agents analyze in parallel (~3 min)
     ↓
High-confidence comments posted to GitHub
     ↓
Developer fixes automated findings
     ↓
Human reviewer focuses on architecture and business logic
     ↓
PR merged ✅

Troubleshooting

Common Issues

Debug Logs

# View detailed logs from the last review
/code-review --verbose

# View filtered findings (below threshold)
/code-review --show-all

FAQ

Does the plugin work with monorepos?

Yes. The plugin only analyzes files changed in the PR, regardless of repository size. For monorepos, it uses Git context to understand relationships between packages.

Can I exclude certain files from review?

Yes, via a .code-review-ignore file at the root of your repository, using the same syntax as .gitignore:

# Ignore generated files
**/generated/**
*.min.js

# Ignore tests
**/__tests__/**

Does the plugin support platforms other than GitHub?

Currently, the plugin is optimized for GitHub. GitLab and Bitbucket support is planned by Anthropic for upcoming versions.

What's the difference between /review and the Code Review plugin?

The built-in /review command in Claude Code is a simple single-pass review. The Code Review plugin uses 5 specialized agents in parallel with confidence scoring, producing more accurate results and fewer false positives.