Contextia

Contextia is an open-source, on-device data loss prevention tool designed to detect and handle sensitive information such as API keys, tokens, and credentials before they are exposed to AI assistants. It aims to keep secrets out of AI surfaces by identifying and redacting them before they leave a user's environment, supporting privacy and security for individuals and teams working with AI models and coding agents.

The tool operates entirely on the user's device, making zero network requests and ensuring that secrets remain local. Contextia features an engine with 83 detectors for various types of secrets and can be deployed across multiple environments. It is available as a terminal CLI and a local AI-DLP proxy, allowing users to scan diffs or proxy any AI agent so that secrets are either redacted or blocked before transmission. There is also a Claude Code plugin that blocks prompts containing secrets natively, and a browser extension is in development, with submissions pending for the Chrome Web Store and Firefox Add-ons. The engine itself is embeddable in other tools via npm, offering flexibility for integration into different workflows.

For organizational use, Contextia can be managed through SentriKat, a security platform that provides centralized deployment, policy management, and audit logging of secret detection events. With SentriKat, teams can roll out Contextia across browsers and machines from a single console, set organization-wide rules for handling detected secrets, and maintain a searchable log for compliance and auditing purposes.

Contextia is distributed under the MIT license and is free to use forever. It does not require user accounts or telemetry, further supporting privacy. Installation is available via npm, and users can also build from source. The tool is suitable for privacy-conscious individuals, developers, and organizations seeking to prevent accidental leakage of sensitive information when interacting with AI systems.