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Tools: GitHub Actions + Claude API: automate your code review for $0.02 per PR (2026)

2026-04-15 0 views admin
Tools: GitHub Actions + Claude API: automate your code review for $0.02 per PR (2026)

GitHub Actions + Claude API: automate your code review for $0.02 per PR

Why automate code review?

The setup

1. Get a Claude API key

2. Store your key in GitHub Secrets

3. The workflow file

4. What it reviews

Real output example

Cost breakdown

Customizing the prompt

Handling large PRs

Adding it to your team I've been using Claude API in GitHub Actions to auto-review pull requests. The cost? About $0.02 per PR. Here's the exact workflow. Code review is the bottleneck in most teams. A PR sits for 24 hours waiting for a human reviewer. Meanwhile, the simple stuff — naming, error handling, missing tests — could be caught instantly. With a Claude API key, you can add a reviewer that never sleeps. You need API access. I use SimplyLouie's developer tier — it's $10/month for full Claude API access with a real API key. Much cheaper than managing Anthropic credits directly for low-volume use cases like CI. Create .github/workflows/ai-review.yml: For each PR, the bot will check: Here's what a review comment looks like: Vs. paying a contractor for code review: easily $50-200/hour. You can tune the review focus: For PRs > 300 lines, split by file: The workflow is opt-in per repo. Add it to your highest-traffic repos first. The bot comments on every PR — humans still approve/merge. I've found it catches about 30% of issues before human review, which makes the actual review faster. The human reviewer can focus on architecture and logic instead of syntax. API access: simplylouie.com/developers — $10/month, full Claude API, no usage caps for normal workloads. What else would you automate with this? Commit message quality? Changelog generation? Let me know in the comments. Templates let you quickly answer FAQs or store snippets for re-use. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse

Command

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# In your repo: Settings → Secrets → Actions → New repository secret # Name: CLAUDE_API_KEY # Value: your key from simplylouie.com/developers # In your repo: Settings → Secrets → Actions → New repository secret # Name: CLAUDE_API_KEY # Value: your key from simplylouie.com/developers # In your repo: Settings → Secrets → Actions → New repository secret # Name: CLAUDE_API_KEY # Value: your key from simplylouie.com/developers name: AI Code Review on: pull_request: types: [opened, synchronize] jobs: ai-review: runs-on: ubuntu-latest permissions: pull-requests: write contents: read steps: - name: Checkout uses: actions/checkout@v4 with: fetch-depth: 0 - name: Get PR diff id: diff run: | -weight: 500;">git diff origin/${{ github.base_ref }}...HEAD > pr_diff.txt echo "lines=$(wc -l < pr_diff.txt)" >> $GITHUB_OUTPUT - name: AI Review env: CLAUDE_API_KEY: ${{ secrets.CLAUDE_API_KEY }} PR_TITLE: ${{ github.event.pull_request.title }} run: | DIFF=$(cat pr_diff.txt | head -300) # limit tokens RESPONSE=$(-weight: 500;">curl -s https://api.simplylouie.com/v1/chat \ -H "Authorization: Bearer $CLAUDE_API_KEY" \ -H "Content-Type: application/json" \ -d "{ \"model\": \"claude-3-5-sonnet-20241022\", \"max_tokens\": 1024, \"messages\": [{ \"role\": \"user\", \"content\": \"Review this PR diff. Be concise. Flag: bugs, security issues, missing error handling, naming problems. PR: $PR_TITLE\\n\\nDiff:\\n$DIFF\" }] }") echo "$RESPONSE" | python3 -c " import json, sys data = json.load(sys.stdin) print(data['choices'][0]['message']['content']) " > review.txt cat review.txt - name: Post review comment uses: actions/github-script@v7 with: script: | const fs = require('fs') const review = fs.readFileSync('review.txt', 'utf8') await github.rest.issues.createComment({ issue_number: context.issue.number, owner: context.repo.owner, repo: context.repo.repo, body: `## 🤖 AI Code Review\n\n${review}\n\n---\n*Powered by Claude via [SimplyLouie API](https://simplylouie.com/developers)*` }) name: AI Code Review on: pull_request: types: [opened, synchronize] jobs: ai-review: runs-on: ubuntu-latest permissions: pull-requests: write contents: read steps: - name: Checkout uses: actions/checkout@v4 with: fetch-depth: 0 - name: Get PR diff id: diff run: | -weight: 500;">git diff origin/${{ github.base_ref }}...HEAD > pr_diff.txt echo "lines=$(wc -l < pr_diff.txt)" >> $GITHUB_OUTPUT - name: AI Review env: CLAUDE_API_KEY: ${{ secrets.CLAUDE_API_KEY }} PR_TITLE: ${{ github.event.pull_request.title }} run: | DIFF=$(cat pr_diff.txt | head -300) # limit tokens RESPONSE=$(-weight: 500;">curl -s https://api.simplylouie.com/v1/chat \ -H "Authorization: Bearer $CLAUDE_API_KEY" \ -H "Content-Type: application/json" \ -d "{ \"model\": \"claude-3-5-sonnet-20241022\", \"max_tokens\": 1024, \"messages\": [{ \"role\": \"user\", \"content\": \"Review this PR diff. Be concise. Flag: bugs, security issues, missing error handling, naming problems. PR: $PR_TITLE\\n\\nDiff:\\n$DIFF\" }] }") echo "$RESPONSE" | python3 -c " import json, sys data = json.load(sys.stdin) print(data['choices'][0]['message']['content']) " > review.txt cat review.txt - name: Post review comment uses: actions/github-script@v7 with: script: | const fs = require('fs') const review = fs.readFileSync('review.txt', 'utf8') await github.rest.issues.createComment({ issue_number: context.issue.number, owner: context.repo.owner, repo: context.repo.repo, body: `## 🤖 AI Code Review\n\n${review}\n\n---\n*Powered by Claude via [SimplyLouie API](https://simplylouie.com/developers)*` }) name: AI Code Review on: pull_request: types: [opened, synchronize] jobs: ai-review: runs-on: ubuntu-latest permissions: pull-requests: write contents: read steps: - name: Checkout uses: actions/checkout@v4 with: fetch-depth: 0 - name: Get PR diff id: diff run: | -weight: 500;">git diff origin/${{ github.base_ref }}...HEAD > pr_diff.txt echo "lines=$(wc -l < pr_diff.txt)" >> $GITHUB_OUTPUT - name: AI Review env: CLAUDE_API_KEY: ${{ secrets.CLAUDE_API_KEY }} PR_TITLE: ${{ github.event.pull_request.title }} run: | DIFF=$(cat pr_diff.txt | head -300) # limit tokens RESPONSE=$(-weight: 500;">curl -s https://api.simplylouie.com/v1/chat \ -H "Authorization: Bearer $CLAUDE_API_KEY" \ -H "Content-Type: application/json" \ -d "{ \"model\": \"claude-3-5-sonnet-20241022\", \"max_tokens\": 1024, \"messages\": [{ \"role\": \"user\", \"content\": \"Review this PR diff. Be concise. Flag: bugs, security issues, missing error handling, naming problems. PR: $PR_TITLE\\n\\nDiff:\\n$DIFF\" }] }") echo "$RESPONSE" | python3 -c " import json, sys data = json.load(sys.stdin) print(data['choices'][0]['message']['content']) " > review.txt cat review.txt - name: Post review comment uses: actions/github-script@v7 with: script: | const fs = require('fs') const review = fs.readFileSync('review.txt', 'utf8') await github.rest.issues.createComment({ issue_number: context.issue.number, owner: context.repo.owner, repo: context.repo.repo, body: `## 🤖 AI Code Review\n\n${review}\n\n---\n*Powered by Claude via [SimplyLouie API](https://simplylouie.com/developers)*` })

🤖 AI Code Review **Potential bug (line 47):** `user.address` could be null if the user hasn't set their address. Add a null check before calling `.split(',')`. **Missing error handling (line 83):** The `fetch()` call doesn't have

a `.catch()`. If the network request fails, the promise will be unhandled. **Naming (line 102):** `data2` is unclear. Consider `filteredUsers` or `activeUsers` based on context. ---

*Powered by Claude via SimplyLouie API*

Command

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$

🤖 AI Code Review **Potential bug (line 47):** `user.address` could be null if the user hasn't set their address. Add a null check before calling `.split(',')`. **Missing error handling (line 83):** The `fetch()` call doesn't have

a `.catch()`. If the network request fails, the promise will be unhandled. **Naming (line 102):** `data2` is unclear. Consider `filteredUsers` or `activeUsers` based on context. ---

*Powered by Claude via SimplyLouie API*

Command

Copy

$

🤖 AI Code Review **Potential bug (line 47):** `user.address` could be null if the user hasn't set their address. Add a null check before calling `.split(',')`. **Missing error handling (line 83):** The `fetch()` call doesn't have

a `.catch()`. If the network request fails, the promise will be unhandled. **Naming (line 102):** `data2` is unclear. Consider `filteredUsers` or `activeUsers` based on context. ---

*Powered by Claude via SimplyLouie API*

Command

Copy

# Security-focused content: "Review this diff for security vulnerabilities only. Be specific about line numbers." # Performance-focused content: "Review for performance issues: N+1 queries, unnecessary re-renders, memory leaks." # Junior team content: "Review for a junior dev team. Explain why each issue matters." # Security-focused content: "Review this diff for security vulnerabilities only. Be specific about line numbers." # Performance-focused content: "Review for performance issues: N+1 queries, unnecessary re-renders, memory leaks." # Junior team content: "Review for a junior dev team. Explain why each issue matters." # Security-focused content: "Review this diff for security vulnerabilities only. Be specific about line numbers." # Performance-focused content: "Review for performance issues: N+1 queries, unnecessary re-renders, memory leaks." # Junior team content: "Review for a junior dev team. Explain why each issue matters." # Review each changed file separately -weight: 500;">git diff origin/$BASE...HEAD --name-only | while read file; do -weight: 500;">git diff origin/$BASE...HEAD -- "$file" | head -150 > "diff_$file.txt" # ... send each to API done # Review each changed file separately -weight: 500;">git diff origin/$BASE...HEAD --name-only | while read file; do -weight: 500;">git diff origin/$BASE...HEAD -- "$file" | head -150 > "diff_$file.txt" # ... send each to API done # Review each changed file separately -weight: 500;">git diff origin/$BASE...HEAD --name-only | while read file; do -weight: 500;">git diff origin/$BASE...HEAD -- "$file" | head -150 > "diff_$file.txt" # ... send each to API done - Bugs: off-by-one errors, null dereferences, unhandled promises - Security: hardcoded secrets, SQL injection patterns, XSS vectors - Error handling: missing try/catch, unhandled rejections - Code quality: function names, magic numbers, overly complex logic - Typical PR diff: ~200 lines = ~1,500 tokens input - Review response: ~300 tokens output - Cost per review: $0.02 - 50 PRs/month = $1.00 in API costs + $10/month for the key = $11/month total

🏷️ Tags

toolsutilitiessecurity toolsgithubactionsclaudeautomatereview

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