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HOL Guard

Quick answer: HOL Guard is an open-source agent runtime security and posture platform from HOL (Hashgraph Online) that also has a commercial offering (open-source license: Apache-2.0). Local-first, Apache-2.0 approval layer that runs beside AI coding agents such as Claude Code, Codex and Cursor on the developer's own machine. Before risky actions run (shell commands, secret reads, MCP changes, package, plugin and skill installs) it pauses the action and lets the developer approve or block it. HOL says it is not a network firewall or cloud MCP gateway and not a complete prompt-injection preventer. Free on one machine; Guard Cloud is an optional paid add-on for teams. Install with pipx.
Open source + commercial
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HOL Guard at a glance
CategoryAgent runtime security & posture
Official sitehol.org/guard
MakerHOL (Hashgraph Online)
Ownership / acquisitionNot published / not yet verified
License modelOpen source + commercial
LicenseApache-2.0
Public pricingGuard Local is free; Guard Cloud is an optional paid add-on (https://hol.org/guard/pricing)
Source codehashgraph-online/hol-guard
Last verified

Facts are taken from the vendor's own site, GitHub, or a linked public source. Blank means we could not confirm it, not that it does not exist. Vendors can request a correction for free.

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Frequently asked questions

What is HOL Guard?

HOL Guard is an open-source agent runtime security and posture platform from HOL (Hashgraph Online) that also has a commercial offering (open-source license: Apache-2.0). Local-first, Apache-2.0 approval layer that runs beside AI coding agents such as Claude Code, Codex and Cursor on the developer's own machine. Before risky actions run (shell commands, secret reads, MCP changes, package, plugin and skill installs) it pauses the action and lets the developer approve or block it. HOL says it is not a network firewall or cloud MCP gateway and not a complete prompt-injection preventer. Free on one machine; Guard Cloud is an optional paid add-on for teams. Install with pipx.

Is HOL Guard open source?

Partly. HOL Guard has an open-source edition (Apache-2.0) and a commercial offering. Source code: github.com/hashgraph-online/hol-guard.

How much does HOL Guard cost?

Published pricing: Guard Local is free; Guard Cloud is an optional paid add-on (https://hol.org/guard/pricing). Checked on November 12, 2026; confirm current prices on the official site.

Who makes HOL Guard?

HOL (Hashgraph Online).

What are alternatives to HOL Guard?

Other agent runtime security and posture platforms listed here include Pillar Security, Prisma AIRS, Cisco AI Defense, HiddenLayer and Zenity. See all 23 in Agent runtime security & posture.