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+# Sync to VIP Production Composite Action
+
+This GitHub Actions composite action synchronizes code from a source repository to a WordPress VIP production repository.
+
+## Overview
+
+The `sync-vip-prod` composite action is designed to automate the deployment process for WordPress VIP sites by:
+
+1. Checking out the source repository
+2. Checking out the destination VIP repository
+3. Syncing files while preserving protected directories
+4. Committing and pushing changes to the destination repository
+5. Sending Slack notifications on failure
+
+## Usage
+
+```yaml
+- name: Sync to VIP Production
+  uses: ./composites/sync-vip-prod
+  with:
+    destination_repo: 'wpcomvip/your-site'
+    destination_branch: 'production'
+    destination_directory: 'wp-content/themes/your-theme'
+    protected_directories: 'wp-content/plugins/brand-specific-plugin'
+    GIT_EMAIL: 'your-bot@example.com'
+    SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+    SSH_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
+```
+
+## Inputs
+
+| Input | Description | Required | Default |
+|-------|-------------|----------|---------|
+| `destination_repo` | Destination repository slug, including organization (e.g., `wpcomvip/pmc`) | Yes | - |
+| `destination_branch` | Branch name in the destination repository | Yes | - |
+| `destination_directory` | Directory path relative to repository root where files will be synced | Yes | - |
+| `protected_directories` | Directories to preserve during sync (typically brand-specific plugins) | No | `''` |
+| `GIT_EMAIL` | Email address for the Git user making commits | Yes | - |
+| `SLACK_WEBHOOK_URL` | Webhook URL for failure notifications | No | `''` |
+| `SSH_KEY` | SSH private key with access to both source and destination repositories | Yes | - |
+
+## Workflow Steps
+
+### 1. Repository Checkout
+- **Source Repository**: Checks out the current repository with minimal history (`fetch-depth: 1`)
+- **Destination Repository**: Checks out the specified VIP repository and branch using the provided SSH key
+- **Utility Scripts**: Checks out `penske-media-corp/pmc-jenkins-scripts` for helper functions
+
+### 2. File Synchronization Process
+
+The action uses several utility functions from the Jenkins scripts:
+
+- **`exclude_plugins`**: Temporarily moves protected directories out of the way
+- **`rsync_repo_files`**: Synchronizes files from source to destination using rsync
+- **`restore_plugins`**: Restores the protected directories after sync
+- **`setup_git_committer`**: Configures Git committer information based on the source repository
+
+### 3. Git Operations
+
+The action performs the following Git operations:
+- Configures Git user as `pmcvipgo-sync` with the provided email
+- Stages all changes (`git add --all`)
+- Checks if there are changes to commit
+- Creates a commit with metadata about the source repository and revision
+- Pushes changes to the destination branch
+
+### 4. Error Handling and Notifications
+
+If the sync fails and a Slack webhook URL is provided:
+- Retrieves job details from the GitHub API
+- Sends a formatted Slack notification with source, destination, and failure details
+
+## Commit Message Format
+
+Commits created by this action follow this format:
+```
+Sync from {source-repo}:{branch-name} for revision {commit-hash} by {author}
+```
+
+## Slack Notification
+
+When a sync fails, the action sends a Slack notification with:
+- Alert header indicating production sync failure
+- Source repository and branch information
+- Destination repository and branch information
+- Link to the failed GitHub Actions job
+
+## Protected Directories
+
+The `protected_directories` input allows you to specify directories that should be preserved in the destination repository during the sync. This is useful for:
+
+- Brand-specific plugins that aren't in the shared source repository
+- Configuration files specific to the VIP environment
+- Any custom modifications that shouldn't be overwritten
+
+Multiple directories can be specified (the exact format depends on the utility functions implementation).
+
+## Requirements
+
+- The SSH key must have read access to the source repository
+- The SSH key must have write access to the destination VIP repository
+- The destination repository must exist and have the specified branch
+- The `penske-media-corp/pmc-jenkins-scripts` repository must be accessible
+
+## Security Considerations
+
+- SSH keys should be stored as GitHub repository secrets
+- Slack webhook URLs should be stored as secrets
+- The action runs with the permissions of the provided SSH key
+- All file operations are performed in isolated workspace directories
+
+## Debugging
+
+Enable debug mode by setting `ACTIONS_STEP_DEBUG=true` in your workflow. This will:
+- List contents of all workspace directories
+- Show detailed information about the checkout process
+- Display Git operations and status information
+
+## Example Workflow
+
+```yaml
+name: Deploy to VIP Production
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to Production
+        uses: ./composites/sync-vip-prod
+        with:
+          destination_repo: 'wpcomvip/your-brand'
+          destination_branch: 'production'
+          destination_directory: 'wp-content/themes/brand-theme'
+          protected_directories: 'wp-content/plugins/brand-analytics wp-content/mu-plugins/brand-config'
+          GIT_EMAIL: 'deploy-bot@yourbrand.com'
+          SLACK_WEBHOOK_URL: ${{ secrets.PROD_DEPLOY_SLACK_WEBHOOK }}
+          SSH_KEY: ${{ secrets.VIP_DEPLOY_SSH_KEY }}
+```
+
+## Related Files
+
+- [`action.yml`](./action.yml) - The composite action definition
+- [`slack-payload.json`](./slack-payload.json) - Slack notification template
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