--- title: HOL Guard: The 1st Firewall for AI Agents | daily.dev description: 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... canonical: https://daily.dev/posts/hol-guard-the-1st-firewall-for-ai-agents-20nk3oefa twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: HOL Guard: The 1st Firewall for AI Agents | daily.dev og:description: 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... og:url: https://daily.dev/posts/hol-guard-the-1st-firewall-for-ai-agents-20nk3oefa og:image: https://api.daily.dev/og/posts/20nK3oEfa.png og:image:alt: HOL Guard: The 1st Firewall for AI Agents og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # HOL Guard: The 1st Firewall for AI Agents **[Product Hunt](https://daily.dev/sources/ph)** · 1 min read · 0 upvotes · 0 comments ## Summary 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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [CtrlAI: Transparent proxy that secures AI agents with guardrails](https://daily.dev/posts/ctrlai-transparent-proxy-that-secures-ai-agents-with-guardrails-f6eeimc9b) · Product Hunt · 1 upvotes · 0 comments - [16 governance tools for securing your AI fleet](https://daily.dev/posts/16-governance-tools-for-securing-your-ai-fleet-jzsakpwbb) · CSO Online · 0 upvotes · 0 comments - [From Prototype to Production: The Architecture Behind Secure & Governed AI Agents](https://daily.dev/posts/from-prototype-to-production-the-architecture-behind-secure-governed-ai-agents-lciugqfyu) · Towards Data Science · 0 upvotes · 0 comments - [Vorlon Adds Guardian Gateway to Secure Any AI Agent](https://daily.dev/posts/vorlon-adds-guardian-gateway-to-secure-any-ai-agent-bnpykywc8) · Security Boulevard · 0 upvotes · 0 comments - [Introducing Arcjet Guards: security inside the agent loop](https://daily.dev/posts/introducing-arcjet-guards-security-inside-the-agent-loop-x607llbcm) · Arcjet · 1 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#open-source](https://daily.dev/tags/open-source), [#ai-agents](https://daily.dev/tags/ai-agents), [#prompt-injection](https://daily.dev/tags/prompt-injection), [#firewall](https://daily.dev/tags/firewall) [View this post on daily.dev](https://daily.dev/posts/hol-guard-the-1st-firewall-for-ai-agents-20nk3oefa) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"HOL Guard: The 1st Firewall for AI Agents","url":"https://daily.dev/posts/hol-guard-the-1st-firewall-for-ai-agents-20nk3oefa","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hol-guard-the-1st-firewall-for-ai-agents-20nk3oefa"},"datePublished":"2026-07-23T07:42:52.293Z","dateModified":"2026-07-23T16:05:26.400Z","description":"HOL Guard is an open-source firewall for AI agents, built by HOL, an open standards consortium. 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