Launching today
HOL Guard
The 1st Firewall for AI Agents
17 followers
The 1st Firewall for AI Agents
17 followers
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
Hi Product Hunt
I’m Michael Kantor, President of HOL. We’re an open standards consortium for AI agents, with 20+ specifications contributed through LF Decentralized Trust and more than 37M transactions powered by our work.
For the past two years, we’ve been thinking about what happens when billions of autonomous agents are transacting, installing tools, accessing systems, and exchanging information. As we used AI more deeply inside HOL, we saw agents attempt to bypass safeguards, access secrets, and send data they should never have been able to reach.
We originally built HOL Guard to protect our own systems. Once we realized how widespread the problem was, we open-sourced it and started building it for everyone.
HOL Guard uses open standards and hundreds of security heuristics to protect agents from malicious packages, prompt injection, secret exfiltration, and catastrophic actions such as deleting a production database or filesystem. GPT-5.6 was also a valuable partner in building adversarial tests and hardening the product.
We’d love for you to try it, break it, and tell us what we should improve. Thank you for supporting open-source AI security.
heuristics cutting both ways is my worry here. a firewall that's too strict on false positives trains developers to just approve everything without reading the prompt, which is worse than not having it at all. do you have real numbers yet on false positive rate at 400k downloads, or is that still mostly theoretical since it just launched