# 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"
)