A small AI model runs locally in the browser to detect personal details like names and account numbers before they are sent to a prompt. AgentCloak's new extension replaces these sensitive values with substitutes and restores the original data once the model provides a response. The tool supports ChatGPT, Claude, Gemini, Grok, and DeepSeek without requiring a user account.

The browser-based system preserves the semantics of a request by using realistic stand-ins rather than simple redaction, which can alter the reasoning task for the AI. This functionality allows users to summarize support tickets or debug logs while keeping identifying information on their own machines. The extension is now free for all users.