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Overview

When downloading Antigravity Manager from outside the Mac App Store, macOS may quarantine the application to protect your system. This page explains how to safely bypass these restrictions.

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Common Errors

These security measures are in place to protect you. Only proceed if you trust the source of the application.

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”App is damaged and can’t be opened”

This is the most common error when macOS quarantines an application. Despite the message, the app is not actually damaged—it’s simply blocked by Gatekeeper.

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”App can’t be opened because it is from an unidentified developer”

This occurs when the application is not notarized by Apple or the developer certificate is not recognized.

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”App can’t be verified”

macOS couldn’t verify the app for malicious software.

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Solutions

This is the most reliable method to fix macOS quarantine issues.
  1. Open Terminal (Applications → Utilities → Terminal)
  2. Run the quarantine removal command: 
    sudo xattr -rd com.apple.quarantine "/Applications/Antigravity Tools.app"
  3. Enter your password when prompted
  4. Launch the application normally from Applications
This command removes the quarantine attribute without disabling macOS security features.

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Method 2: Homebrew Installation with —no-quarantine

If you’re installing via Homebrew, you can prevent quarantine from the start: 
brew install --cask --no-quarantine antigravity-tools
This flag tells Homebrew to skip the quarantine attribute when installing the application.

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Method 3: System Settings Override

This method is less secure as it requires disabling Gatekeeper temporarily.
  1. Try to open the app (it will be blocked)
  2. Open System Settings:
    • macOS Ventura and later: System Settings → Privacy & Security
    • macOS Monterey and earlier: System Preferences → Security & Privacy
  3. Look for the security message:
    • You should see: “Antigravity Tools was blocked from use because it is not from an identified developer”
  4. Click “Open Anyway” or “Allow”
  5. Confirm when prompted

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Method 4: Manual Gatekeeper Disable (Advanced)

This temporarily disables Gatekeeper system-wide. Only use this if you understand the security implications.
  1. Disable Gatekeeper: 
    sudo spctl --master-disable
  2. Open the application
  3. Re-enable Gatekeeper: 
    sudo spctl --master-enable

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Verifying the Fix

After applying any of the above methods:
  1. Launch Antigravity Manager from Applications
  2. Check the menu bar - you should see the app icon
  3. Verify functionality - navigate to different pages

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Understanding the Quarantine Attribute

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What is com.apple.quarantine?

The com.apple.quarantine extended attribute is automatically added by macOS to files downloaded from the internet. It triggers Gatekeeper checks when you try to open the file.

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Check if an app is quarantined:

xattr "/Applications/Antigravity Tools.app"
If you see com.apple.quarantine in the output, the app is quarantined.

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View detailed quarantine information:

xattr -p com.apple.quarantine "/Applications/Antigravity Tools.app"
This shows when and how the file was quarantined.

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Prevention

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For Future Installations

  1. Use Homebrew with —no-quarantine flag: 
    brew tap lbjlaq/antigravity-manager https://github.com/lbjlaq/Antigravity-Manager
brew install --cask --no-quarantine antigravity-tools
  2. Remove quarantine immediately after download: 
    # If you downloaded the .dmg file
xattr -rd com.apple.quarantine ~/Downloads/Antigravity-Tools-*.dmg
  3. Keep the app updated - newer versions may have improved notarization

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Troubleshooting

The xattr command should be available on all macOS systems. If it’s not found:
  1. Ensure you’re using the correct terminal (not a custom shell that modifies PATH)
  2. Try the full path: /usr/bin/xattr
  3. Verify macOS command line tools are installed: 
    xcode-select --install
If you get “Operation not permitted” when running the command:
  1. Check Full Disk Access:
    • System Settings → Privacy & Security → Full Disk Access
    • Add Terminal to the allowed apps
  2. Disable System Integrity Protection (SIP) temporarily:
    Only do this if you understand the security implications.
    • Restart in Recovery Mode (hold Cmd+R during boot)
    • Open Terminal from Utilities menu
    • Run: csrutil disable
    • Restart normally
    • Remove quarantine attribute
    • Re-enable SIP by repeating steps with csrutil enable
  1. Check if the app is properly installed: 
    ls -la "/Applications/Antigravity Tools.app"
  2. Verify file permissions: 
    # Make the app executable
chmod +x "/Applications/Antigravity Tools.app/Contents/MacOS/antigravity-manager"
  3. Check Console logs for errors:
    • Open Console app (Applications → Utilities → Console)
    • Look for errors related to Antigravity Tools
  4. Reinstall the application:
    • Delete the existing app
    • Download fresh from GitHub Releases
    • Remove quarantine before opening
  1. Update Homebrew: 
    brew update
  2. Clear Homebrew cache: 
    brew cleanup
rm -rf "$(brew --cache)"
  3. Retry installation: 
    brew install --cask --no-quarantine antigravity-tools
  4. Check Homebrew logs: 
    brew install --cask --no-quarantine antigravity-tools --verbose

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Security Considerations

Removing quarantine attributes should only be done for applications you trust.

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Why is this necessary?

Antigravity Manager is an open-source application distributed outside the Mac App Store. While the code is publicly available and can be audited, it may not be officially notarized by Apple, triggering these security warnings.

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Is it safe?

  • The application source code is available at GitHub
  • You can review the code before installing
  • The community actively maintains and reviews contributions
  • Removing the quarantine attribute only affects this specific app, not system-wide security

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Best Practices

  1. Download only from official sources:
  2. Verify checksums if provided in release notes
  3. Keep the application updated to ensure you have the latest security fixes
  4. Review permissions the app requests

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Alternative: Building from Source

If you prefer maximum security, you can build the application from source: 
# Clone the repository
git clone https://github.com/lbjlaq/Antigravity-Manager.git
cd Antigravity-Manager

# Install dependencies
npm install

# Build the application
npm run tauri build
This way, you can audit the code and build it yourself, eliminating quarantine issues entirely.

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