A small AI model running locally in the browser detects names and account numbers to replace them with substitutes before prompts are sent to AI providers. The AgentCloak extension restores these original values in the AI's reply to maintain the utility of the response. The tool supports ChatGPT, Claude, Gemini, Grok, and DeepSeek and requires no account for installation or use.

The system focuses on context preservation, which differs from standard redaction by keeping enough semantics for models to answer properly without identifying the user. Typical applications include summarizing support tickets or debugging logs. The browser extension is now free to the public after previously being utilized by large corporations to protect prompt privacy.