Interactive Simulation

Claude Code × GitHub Actions

AI-powered automated code analysis, code review, and refactoring suggestions.
Integrated into your GitHub repo, runs automatically on every push.

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AI-Powered Pull Request Review

See how Claude reviews a Pull Request in real time

feat: add user authentication middleware #142

● Open developer wants to merge 3 commits into main from feat/auth
src/middleware/auth.js +47 -3
14 14 const express = require('express');
15 15 const jwt = require('jsonwebtoken');
16 + const SECRET = "myapp_secret_key_2024";
17 +
18 + function verifyToken(req, res, next) {
19 + const token = req.headers.authorization;
20 + const decoded = jwt.verify(token, SECRET);
21 + req.user = decoded;
22 + next();
23 + }
Claude just now
Critical

Security Vulnerability: Secret key is hardcoded directly in the source code. This is a serious security risk.

Suggested Change
- const SECRET = "myapp_secret_key_2024";
+ const SECRET = process.env.JWT_SECRET;
+ if (!SECRET) throw new Error('JWT_SECRET env variable required');
Claude just now
Warning

Missing Error Handling: jwt.verify() can throw errors but there is no try-catch block. The application will crash if the token is invalid or expired.

Suggested Change
-   const token = req.headers.authorization;
-   const decoded = jwt.verify(token, SECRET);
-   req.user = decoded;
-   next();
+   try {
+     const authHeader = req.headers.authorization;
+     if (!authHeader?.startsWith('Bearer ')) {
+       return res.status(401).json({ error: 'Token required' });
+     }
+     const token = authHeader.split(' ')[1];
+     const decoded = jwt.verify(token, SECRET);
+     req.user = decoded;
+     next();
+   } catch (err) {
+     return res.status(403).json({ error: 'Invalid token' });
+   }
Claude Code requested changes

GitHub Actions Workflow

CI/CD pipeline triggered automatically on every push

Push Detected main branch
Workflow Triggered claude-review.yml
Claude Analysis Reviewing code...
Review Created 3 comments, 1 critical
Auto-Fix PR Automatic fix
Completed Ready to merge
Workflow Log 00:00
.github/workflows/claude-review.yml
name: Claude Code Review
on:
  pull_request:
    types: [opened, synchronize]

jobs:
  review:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Claude Code Review
        uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          review_comment: true
          auto_fix: true

What Can It Do?

Capabilities you gain with Claude Code's GitHub integration

Automated Code Review

Every PR is automatically reviewed. Code quality, best practice compliance, and potential issues are identified.

Every PR

Bug Detection

Potential runtime errors, null reference issues, edge cases, and race conditions are detected proactively.

Proactive

Security Audit

Hardcoded secrets, SQL injection, XSS vulnerabilities, and other security issues are automatically scanned.

Critical

Refactoring Suggestions

Code duplication, complex functions, and improvement opportunities are identified with concrete suggestions.

Optimization

Test Generation

Missing test coverage is detected and unit test suggestions are automatically generated.

Automation

Documentation

Missing JSDoc comments, README updates, and API documentation are automatically suggested.

Documentation

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