HOL Guard

What it does

HOL Guard is the firewall for AI agents. It sits between agents and your systems, blocking high-risk actions before they happen like deleting production data to exposing secrets. Built by HOL, it’s free, open source, and already has 400K+ downloads.

HOL Guard sits between any AI agent and the tools it wants to run. Approve or deny shell commands, secret reads, and MCP changes before they execute.

Real Guard blocks, replayed. Each one is a mistake your AI almost made — stopped before it happened. Guard watches what your AI assistant tries to do and asks you first before anything risky — deleting files, reading passwords, installing software, or sending your data out. Runs on your computer — your files never leave your machine. Works even with no internet. Free to start. We'll email you the setup steps so they're ready when you are. Guard sits quietly between your AI assistant and your computer. The moment your AI tries something risky, Guard pauses it and asks you — before anything happens. You don't need to understand the technical details. Guard knows the difference between normal…from hol.org

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