"Claude Code in CI/CD: Automate Code Reviews, Tests, and Deployments in 2026"

# Install Claude Code globally
npm install -g @anthropic-ai/claude-code

# Verify installation
claude --version

# Direct Anthropic access
export ANTHROPIC_API_KEY="sk-ant-..."

# Or via Crazyrouter (40-60% cheaper, automatic fallback)
export ANTHROPIC_API_KEY="sk-cr-..."
export ANTHROPIC_BASE_URL="https://crazyrouter.com"

# .github/workflows/claude-review.yml
name: Claude Code Review

on:
  pull_request:
    types: [opened, synchronize]

jobs:
  ai-review:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

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

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

      - name: Get PR diff
        id: diff
        run: |
          git diff origin/${{ github.base_ref }}...HEAD > /tmp/pr_diff.patch
          echo "lines=$(wc -l < /tmp/pr_diff.patch)" >> $GITHUB_OUTPUT

      - name: Claude Code Review
        if: steps.diff.outputs.lines > 5
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          claude -p "Review this PR diff. Focus on:
          1. Bugs and logic errors
          2. Security vulnerabilities
          3. Performance issues
          4. Missing error handling
          
          Be concise. Only flag real issues, not style preferences.
          
          $(cat /tmp/pr_diff.patch)" > /tmp/review.md

      - name: Post Review Comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const review = fs.readFileSync('/tmp/review.md', 'utf8');
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `## 🤖 Claude Code Review\n\n${review}`
            });

      - name: Check diff size
        id: size-check
        run: |
          DIFF_SIZE=$(wc -c < /tmp/pr_diff.patch)
          if [ "$DIFF_SIZE" -gt 100000 ]; then
            echo "skip=true" >> $GITHUB_OUTPUT
            echo "Diff too large ($DIFF_SIZE bytes), skipping AI review"
          else
            echo "skip=false" >> $GITHUB_OUTPUT
          fi

      - name: Claude Code Review
        if: steps.size-check.outputs.skip != 'true'
        # ... rest of the step

# .gitlab-ci.yml
claude-review:
  stage: review
  image: node:20-slim
  rules:
    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
  script:
    - npm install -g @anthropic-ai/claude-code
    - git diff $CI_MERGE_REQUEST_DIFF_BASE_SHA...$CI_COMMIT_SHA > /tmp/diff.patch
    - |
      claude -p "Review this merge request diff for bugs, security issues, 
      and missing error handling. Be concise." < /tmp/diff.patch > /tmp/review.md
    - |
      curl --request POST \
        --header "PRIVATE-TOKEN: ${GITLAB_TOKEN}" \
        --header "Content-Type: application/json" \
        --data "{\"body\": \"$(cat /tmp/review.md | jq -Rs .)\"}" \
        "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/merge_requests/${CI_MERGE_REQUEST_IID}/notes"
  variables:
    ANTHROPIC_API_KEY: $ANTHROPIC_API_KEY

      - name: Generate Missing Tests
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          # Find changed files
          CHANGED=$(git diff --name-only origin/main...HEAD | grep -E '\.(ts|js|py)$' | grep -v test)
          
          for file in $CHANGED; do
            # Check if test file exists
            TEST_FILE=$(echo "$file" | sed 's/\.\(ts\|js\|py\)$/.test.\1/')
            if [ ! -f "$TEST_FILE" ]; then
              claude -p "Generate unit tests for this file. Use the existing 
              test framework in the project. Output only the test code.
              
              $(cat $file)" > "$TEST_FILE"
              
              echo "Generated: $TEST_FILE"
            fi
          done

# Validate Terraform plan
terraform plan -out=plan.tfplan
terraform show -json plan.tfplan > plan.json

claude -p "Review this Terraform plan for:
1. Destructive changes (resource deletions)
2. Security group misconfigurations  
3. Overly permissive IAM policies
4. Cost implications

$(cat plan.json)"

# Validate Kubernetes manifests
claude -p "Review these Kubernetes manifests for:
1. Missing resource limits
2. Running as root
3. Missing health checks
4. Exposed secrets

$(cat k8s/*.yaml)"

import anthropic

# Switch to Crazyrouter — same SDK, lower cost
client = anthropic.Anthropic(
    api_key="sk-cr-your-key",
    base_url="https://crazyrouter.com"
)