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.

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HOL Guard is an open-source firewall for AI agents, built by HOL, an open standards consortium. It sits between agents and your systems, blocking high-risk actions like deleting production data, secret exfiltration, and prompt injection attacks. Built originally to protect HOL's own infrastructure, it uses open standards and hundreds of security heuristics. It's free, open source, and has already surpassed 400K downloads.

HOL Guard: The 1st Firewall for AI Agents