The Agents Index

LLM guardrails and agent security tools

As of October 2026, none of these states a price. HOL Guard has a free plan.

Updated 24 October 20261 tool1 verified in the last 30 days1 updated in that window

Prices checked 29 September 2026

Reviewed by The Agents Index editorial team.

In A–Z order. How we rank →

This spot is open
Featured tools show here and first on related and alternatives pages.
- API access: Not stated
- Free tier: Not stated
- MCP server: Not stated
- Own API key: Not stated
- Open source: Not stated
- Self-hosted: Not stated
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HOL Guard
Local-first runtime security layer that allows, asks or blocks risky AI coding-agent actions before they run.
Free, then $4.99/month
From
Free, then $4.99/month
- API access: Partly
- Free tier: Yes
- MCP server: Yes
- Own API key: Partly
- Open source: Partly
- Self-hosted: Partly
Checked 29 September 2026
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Libraries and APIs that check what goes into and comes out of an agent: prompt injection, data leaks and risky actions.

Questions buyers ask

Which tool here costs the least?

HOL Guard has a free plan.

When were these prices checked?

On 29 September 2026, each read on the maker's own pricing page.

Sources and method

Every price here was read on the maker's own pricing page.

HOL Guard: hol.org/guard/pricing, checked 29 September 2026