Privacy Policy

Last updated: June 2026

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1. Overview

cld-ext (“Claude for Sheets”) is a Google Sheets Editor Add-on built on Google Apps Script. This policy explains what data the add-on accesses, where it goes, and what it does not do.

2. What data the add-on accesses

  • Your spreadsheet data — only the ranges you explicitly select and send as context in the chat. The add-on does not scan or transmit your entire spreadsheet.
  • Your Anthropic API key — stored exclusively in Google Apps Script's PropertiesService.getUserProperties(), scoped to your Google account. It is never written to a shared store and never transmitted to any server we operate.
  • Your chat messages — the text you type in the sidebar and any spreadsheet context you include.

3. Where your data goes

There is no cld-ext server. The add-on calls the Anthropic Messages API directly from within the Apps Script execution environment using your own API key. This means:

  • Your spreadsheet data and prompts are sent to Anthropic (api.anthropic.com), subject to Anthropic's Privacy Policy.
  • Your data does not pass through any cld-ext–owned infrastructure, proxy, or logging system.
  • Your API key is never transmitted to any server other than Anthropic's.

4. Data stored locally

The add-on stores the following data locally, within your Google account and the spreadsheet file:

  • API key and settings — in PropertiesService.getUserProperties(), visible only to you.
  • Audit log — in a hidden sheet called _cld_ext_log within the spreadsheet itself. This log records timestamps, tool calls, and previous/new cell values to support undo. It travels with the spreadsheet file.

5. Data we do not collect

  • We do not collect any analytics, telemetry, or usage data.
  • We do not store any personal information, API keys, or spreadsheet content on any server we control.
  • We do not use cookies or tracking technologies on this website.

6. Google OAuth scopes requested

The add-on requests only the minimum Google OAuth scopes required:

  • spreadsheets.currentonly — read and write the spreadsheet the add-on is installed in.
  • script.external_request — make outbound HTTP requests (to call the Anthropic API).
  • script.container.ui — display the sidebar UI within Google Sheets.

7. Third-party services

The only third-party service this add-on communicates with is Anthropic (api.anthropic.com). By using cld-ext you agree that your prompts and selected spreadsheet data will be sent to Anthropic per their terms. Review Anthropic's privacy policy at anthropic.com/privacy.

8. Children's privacy

cld-ext is not directed at children under 13. We do not knowingly collect data from children.

9. Changes to this policy

If we make material changes to this policy, we will update the date at the top of this page. Continued use of the add-on after changes constitutes acceptance.

10. Contact

Questions? Reach out via the GitHub issues page.