Claude Deep Think — Privacy Policy

Last updated: April 15, 2026

Summary

Claude Deep Think does not collect, transmit, store, or share any personal data. All processing happens locally inside your browser. No analytics, no telemetry, no remote servers, no third parties.

What the extension does

Claude Deep Think is a Chrome extension that appends a user-configured reasoning instruction to every message you send on claude.ai. You control the instruction text and can toggle the feature on or off at any time from the extension popup or from an in-page switch.

What data is stored

• Your instruction text. Saved using Chrome's built-in chrome.storage.local API. It stays on your device. It is never transmitted anywhere other than as part of your own messages to Claude, which you are sending yourself.
• Your on/off toggle state. Also saved via chrome.storage.local. Same scope: local only.

What data is NOT collected

• No personally identifiable information (name, email, IP address, device ID).
• No authentication credentials, cookies, or session tokens.
• No conversation history, message content, or Claude responses.
• No browsing history or page content from any site other than the specific interception described below.
• No analytics or usage metrics.

How the extension interacts with claude.ai

When you send a message on claude.ai, the extension inserts your configured instruction text into the outgoing message body so that it reaches Claude as part of your normal request. This happens entirely inside your browser; the extension does not forward any data to any server other than the original Claude endpoint that your browser was already going to contact.

Permissions requested

• storage — to persist your instruction text and on/off toggle across browser sessions.
• https://claude.ai/* host access — so the extension can inject its logic only on claude.ai and nowhere else.

The extension does not request tabs, activeTab, cookies, webRequest, scripting, or any broader host permission. It does not run on any site other than claude.ai.

Third parties

The extension does not load scripts from any remote origin, does not use any analytics SDK, and does not share any data with any third party. The only network traffic involving the extension is the regular Claude API request that your browser makes when you send a message on claude.ai — and the extension does not add, duplicate, or redirect that request.

Children

The extension is not directed at children under 13 and does not knowingly collect any information from children.

Changes to this policy

If this policy changes, the updated version will be published at the same URL with a new "Last updated" date. Material changes will also be noted in the extension's release notes on the Chrome Web Store.

Contact

Questions or concerns: open an issue at the project's GitHub repository.

Source code

The extension is open source. You can audit every line of code at github.com/daiict218/claude-deep-think-ext.