The warning automatically triggers when a script is deployed as a and configured to run under the security context of the user accessing it, or when it is shared publicly without verification.
Method 1: Deploying via a Google Workspace Enterprise Account (Internal Apps)
For developers building client-facing tools, internal dashboards, or public web utilities, this prominent blue or gray banner can look unprofessional and disrupt user experience. Fortunately, there are several official deployment strategies and alternative methods to clean up your interface. Why Google Injects the Disclaimer Banner
The banner will only disappear once Google trusts the application. The warning automatically triggers when a script is
Method 1: Upgrade to a Google Workspace Account (Easiest Solution)
Before exploring the permanent, server-side solutions, it's worth discussing a few client-side workarounds. Please note, these methods only and do not remove the underlying security notice for other users.
He realized he couldn't just "CSS-hide" his way out of this. To remove the mark, he had to graduate. He began the grueling process of migrating his entire codebase. He moved the logic from Apps Script to a dedicated Node.js server. He swapped the Google Sheet for a robust SQL database. He replaced the simple function with a professional front-end framework. Why Google Injects the Disclaimer Banner The banner
If you are seeing a prompt stating and you want to remove the application (or your connection to it), you are likely dealing with a Google Workspace Add-on, a web app, or an authorization token you previously granted.
If a script runs anonymously ( Execute as: Me and Who has access: Anyone ), Google mandates this warning to protect third-party visitors.
addEventListener('fetch', event => event.respondWith(handleRequest(event.request)) ) async function handleRequest(request) { const googleAppUrl = 'https://google.com' // Fetch the original page from Use code with caution. javascript Google Apps Script Use code with caution. javascript Use code with caution. He realized he couldn't just "CSS-hide" his way out of this
: Perform a search across your project files for any references to "long review" or similar notices to ensure it's not hardcoded somewhere.
: If your script requires broad scopes (such as accessing a user's Google Drive or Gmail account), follow the official guidelines on Apps Script Authorization to avoid triggering aggressive browser-level phishing warnings. Summary Comparison of Solutions Technical Difficulty Branding Freedom Workspace Enterprise Corporate/Internal tools High (Internal only) API Architecture Public Saas, Client Tools 100% Total Control Reverse Proxy Legacy HTML Apps