GitHub Actions Workflows with Claude Code

Confidence: Tier 1 — Official Anthropic action (anthropics/claude-code-action, 6.2k stars, v1.0).

Automate code reviews, issue triage, and quality gates by connecting Claude directly to your GitHub workflow. Two trigger models: @claude mentions (human-initiated) and scheduled/event automations (fully autonomous).

TL;DR
Two Models
Setup
Pattern 1: PR Code Review on @claude Mention
Pattern 2: Automatic PR Review on Push
Pattern 3: Issue Triage and Labeling
Pattern 4: Security-Focused Review
Pattern 5: Scheduled Repo Maintenance
Authentication Alternatives
Cost Control
Security Checklist
See Also

TL;DR

# Minimal working example — paste into .github/workflows/claude.yml
name: Claude Code Review
on:
  issue_comment:
    types: [created]

jobs:
  claude:
    if: contains(github.event.comment.body, '@claude')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      issues: write
    steps:
      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}

Comment @claude review this PR on any PR → Claude reads the diff and posts a review.

Two Models

Model	Trigger	Use case
Interactive	`@claude` mention in PR/issue comment	On-demand reviews, questions, fixes
Automated	Push, PR open, schedule, label	Continuous quality gates, triage

Both use the same action — the difference is the on: block and whether you include an if: condition.

Setup

Quickstart (30 seconds)

In your Claude Code terminal, inside any project connected to a GitHub repo:

/install-github-app

This guides you through creating the GitHub App, adding ANTHROPIC_API_KEY to your repo secrets, and generating the base claude.yml workflow.

Manual Setup

Add ANTHROPIC_API_KEY to your GitHub repository secrets
Create .github/workflows/claude.yml (see patterns below)
Grant the workflow permissions: contents: write, pull-requests: write, issues: write

Pattern 1: PR Code Review on @claude Mention

Human-initiated. A developer comments @claude review this PR and Claude responds inline.

name: Claude Interactive Review
on:
  issue_comment:
    types: [created, edited]
  pull_request_review_comment:
    types: [created]

jobs:
  claude:
    if: |
      contains(github.event.comment.body, '@claude') ||
      contains(github.event.review_comment.body, '@claude')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      issues: write
    steps:
      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          claude_env: |
            GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}

Usage examples:

@claude review this PR — full diff analysis with suggestions
@claude is this change backwards compatible? — targeted question
@claude fix the failing test in src/auth.test.ts — Claude opens a follow-up PR with the fix

Pattern 2: Automatic PR Review on Push

Every PR gets a review the moment it opens or updates. No mention required.

name: Claude Auto PR Review
on:
  pull_request:
    types: [opened, synchronize]
    # Optional: only trigger on specific paths
    # paths:
    #   - 'src/**'
    #   - '!**/*.md'

jobs:
  claude-review:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          prompt: |
            Review this pull request. Focus on:
            - Logic errors and edge cases
            - Security issues (injection, auth, secrets)
            - Performance regressions
            - Missing error handling

            Format your response as:
            ## Summary
            One paragraph describing the change.

            ## Issues Found
            Numbered list, severity (Critical/Major/Minor), file:line reference.

            ## Suggestions
            Optional improvements.

            Keep it under 400 words. Be direct.

Tip: Add paths: to avoid triggering on doc-only PRs, or if: github.event.pull_request.draft == false to skip drafts.

Pattern 3: Issue Triage and Labeling

Claude reads new issues, assigns labels, and posts a structured triage comment.

name: Issue Triage
on:
  issues:
    types: [opened]

jobs:
  triage:
    runs-on: ubuntu-latest
    permissions:
      issues: write
      contents: read
    steps:
      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          prompt: |
            Triage this GitHub issue:

            1. Assign one label from: bug, enhancement, question, documentation, performance, security
            2. Assign a priority label: priority:critical, priority:high, priority:medium, priority:low
            3. Post a comment with:
               - Issue type classification
               - Which component is likely affected (based on the issue description)
               - Next step recommendation for the reporter (reproduce steps needed? version info missing?)

            Be brief. One sentence per point.

Pattern 4: Security-Focused Review

Runs specifically for PRs touching sensitive paths (auth, payments, config).

name: Security Review
on:
  pull_request:
    paths:
      - 'src/auth/**'
      - 'src/payments/**'
      - '**/config/**'
      - '**/.env*'
      - '**/secrets/**'

jobs:
  security-review:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          prompt: |
            Perform a security-focused review of this PR. Check for:

            - Injection vulnerabilities (SQL, command, LDAP)
            - Authentication and authorization bypasses
            - Secrets or credentials in code or comments
            - Insecure direct object references
            - Missing input validation
            - Unsafe deserialization
            - OWASP Top 10 patterns

            Rate overall risk: Low / Medium / High / Critical.
            If High or Critical, add the label 'security-review-required'.
            List each finding with: file:line, vulnerability type, and recommended fix.

Pattern 5: Scheduled Repo Maintenance

Weekly health check — runs without any human trigger.

name: Weekly Repo Health Check
on:
  schedule:
    - cron: '0 9 * * 1'  # Every Monday at 9am UTC
  workflow_dispatch:       # Also allows manual trigger

jobs:
  maintenance:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - uses: actions/checkout@v4

      - uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          prompt: |
            Perform a weekly repository health check:

            1. Scan package.json (or equivalent) for outdated major dependencies
            2. Check for TODO/FIXME comments older than 30 days in src/
            3. Identify any test files without corresponding implementation files
            4. List any documentation files that reference deleted or renamed files

            Open a GitHub issue titled "Weekly Health Check - [date]" with your findings.
            If nothing requires attention, post a comment "Health check passed — no issues found."

Authentication Alternatives

The examples above use ANTHROPIC_API_KEY directly. For teams using cloud providers:

Amazon Bedrock:

- uses: anthropics/claude-code-action@v1
  with:
    use_bedrock: 'true'
  env:
    AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
    AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
    AWS_REGION: us-east-1
    ANTHROPIC_MODEL: 'anthropic.claude-3-5-sonnet-20241022-v2:0'

Google Vertex AI:

- uses: anthropics/claude-code-action@v1
  with:
    use_vertex: 'true'
  env:
    ANTHROPIC_VERTEX_PROJECT_ID: ${{ secrets.GCP_PROJECT_ID }}
    CLOUD_ML_REGION: us-east5
    ANTHROPIC_MODEL: 'claude-3-5-sonnet-v2@20241022'

Cloud providers benefit from data residency compliance and can leverage existing IAM policies instead of managing a separate API key.

Cost Control

Automated workflows run without a human in the loop — set explicit limits.

- uses: anthropics/claude-code-action@v1
  with:
    anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
    # Cap spend per workflow run
    claude_args: '--max-budget-usd 0.50'
    # Use Haiku for triage, Sonnet for reviews — don't default to Opus
    prompt: |
      ...

Budget guidance by pattern:

Pattern	Model	Approx. cost / run
PR review (medium PR)	Sonnet	$0.05–0.15
Issue triage	Haiku	$0.01–0.03
Security review (large PR)	Sonnet	$0.10–0.25
Scheduled maintenance	Sonnet	$0.05–0.20

Monitor actual spend with ccusage or the Anthropic Console usage dashboard.

Prevent runaway costs:

Use paths: filters to avoid triggering on irrelevant changes
Add if: github.event.pull_request.draft == false to skip draft PRs
Set concurrency: to prevent parallel runs on the same PR

jobs:
  claude-review:
    concurrency:
      group: claude-${{ github.event.pull_request.number }}
      cancel-in-progress: true

Security Checklist

Before deploying to a team repo:

ANTHROPIC_API_KEY stored as a GitHub secret, never in workflow YAML
Workflow permissions are minimal — use contents: read unless writes are required
For public repos: add if: github.event.pull_request.head.repo.full_name == github.repository to prevent fork PRs from triggering API calls
Review what the workflow posts publicly — Claude’s comments are visible to all contributors
Use pull_request_target with caution — it runs with write permissions even from forks

Fork safety pattern (public repos):

jobs:
  claude:
    # Only run on PRs from the same repo, not forks
    if: github.event.pull_request.head.repo.full_name == github.repository

GitHub Actions Workflows with Claude Code

GitHub Actions Workflows with Claude Code

Table of Contents

TL;DR

Two Models

Setup

Quickstart (30 seconds)

Manual Setup

Pattern 1: PR Code Review on @claude Mention

Pattern 2: Automatic PR Review on Push

Pattern 3: Issue Triage and Labeling

Pattern 4: Security-Focused Review

Pattern 5: Scheduled Repo Maintenance

Authentication Alternatives

Cost Control

Security Checklist

See Also