Claude Code in GitHub Actions: Automate Code Review, Tests, and More

name: Claude Code PR Review
on:
  pull_request:
    types: [opened, synchronize]
    paths: ['src/**', 'lib/**']

jobs:
  review:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      contents: read
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'

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

      - name: Generate review
        id: claude
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          DIFF=$(git diff origin/${{ github.base_ref }}...HEAD -- 'src/**' 'lib/**' 2>/dev/null | head -c 12000)
          if [ -z "$DIFF" ]; then
            echo "body=No relevant changes to review." >> $GITHUB_OUTPUT
            exit 0
          fi
          PROMPT="You are a senior engineer reviewing a pull request. Review the following diff for: (1) bugs and logic errors, (2) security vulnerabilities, (3) missing error handling, (4) performance issues. Be specific and concise. Format as a markdown list.\n\n\`\`\`diff\n${DIFF}\n\`\`\`"
          REVIEW=$(echo "$PROMPT" | claude --headless --print --max-turns 3 2>/dev/null)
          {
            echo 'body<<GHEOF'
            echo "## Claude Code Review"
            echo ""
            echo "$REVIEW"
            echo 'GHEOF'
          } >> $GITHUB_OUTPUT

      - name: Comment on PR
        uses: actions/github-script@v7
        if: steps.claude.outputs.body != ''
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: `${{ steps.claude.outputs.body }}`
            })

name: Claude Auto-Fix Tests
on:
  workflow_dispatch:
    inputs:
      branch:
        description: 'Branch to fix'
        required: true

jobs:
  fix-tests:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ inputs.branch }}
          token: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/setup-node@v4
        with: { node-version: '20' }

      - run: npm ci

      - name: Capture test failures
        id: tests
        run: |
          npm test 2>&1 | tail -100 > /tmp/test-output.txt || true
          echo "output=$(cat /tmp/test-output.txt | head -c 3000)" >> $GITHUB_OUTPUT

      - name: Claude fixes tests
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          claude --headless --print --max-turns 20 \
            "The test suite is failing. Here is the output:\n$(cat /tmp/test-output.txt)\nFix the failing tests. Read the relevant source files, understand the failures, and edit the test or source files to fix them. Run the tests after each fix to confirm."

      - name: Commit fixes
        run: |
          git config user.name "Claude Code"
          git config user.email "claude@anthropic.com"
          git add -A
          git diff --staged --quiet || git commit -m "fix: auto-fix failing tests via Claude Code"
          git push