The best AI tools for securing coding agents in 2026

A coding agent that runs shell commands can read your keys, wipe uncommitted work or install a poisoned plugin. These tools fence it in: sandboxes, command guards and scanners for the MCP servers and skills it loads.

By Sheela · Updated Oct 26, 2026 · How we review

How we chose: each pick is a product, model or project we have reviewed that does this job according to our review of it, ranked by our rating out of 5. We take no affiliate commission.

Also ranked: the best open-source LLM gateways and observability tools

1. 1

   GitHub Repos: Gateways, observability & guardrails

   A

   Anthropic Sandbox Runtime (srt)

   Your coding agent can be talked into anything; the operating system can't, and srt puts the operating system in charge.

   Best for: Every developer running a coding agent on their own machine, as the first layer of protection.

   Price: Free and open source under Apache 2.0.

   Read our Anthropic Sandbox Runtime (srt) review
   4.4/5
2. 2

   GitHub Repos: Gateways, observability & guardrails

   N

   NVIDIA OpenShell

   A heavyweight agent sandbox built for agents you leave running unattended, not ones you sit and watch.

   Best for: Teams running agents unattended or on untrusted code who need per-host and per-method network rules.

   Price: Free and open source under Apache 2.0.

   Read our NVIDIA OpenShell review
   4.1/5
3. 3

   GitHub Repos: Gateways, observability & guardrails

   O

   OpenSandbox

   A self-hosted answer to hosted code sandboxes, worth the Kubernetes work when you need thousands of short-lived agent environments on your own machines.

   Best for: Platform teams running agent evaluations, RL rollouts or multi-tenant code execution who want sandboxes on their own infrastructure.

   Price: Free and open source under Apache 2.0; no paid edition from the maintainers.

   Read our OpenSandbox review
   4.1/5
4. 4

   GitHub Repos: Gateways, observability & guardrails

   T

   ToolHive

   Scanners tell you whether an MCP server looks dangerous; ToolHive limits what it can do if it is.

   Best for: Platform and security teams that need to run, contain and audit MCP servers across a company.

   Price: Open source under Apache 2.0; Stacklok Enterprise adds features and support, priced on request.

   Read our ToolHive review
   4.1/5
5. 5

   GitHub Repos: Skills & plugins

   C

   CC Safety Net

   The seatbelt for the damage a sandbox allows on purpose: force-pushes, hard resets and rm -rf inside your own project.

   Best for: Anyone letting a coding agent run shell commands without approving each one.

   Price: Free and open source under MIT.

   Read our CC Safety Net review
   4.0/5
6. 6

   GitHub Repos: Gateways, observability & guardrails

   S

   Snyk Agent Scan

   A sensible first check on the MCP servers and skills your agents trust, provided you accept sending their descriptions to Snyk and scan untrusted configs in a sandbox.

   Best for: Teams that let developers or agents install MCP servers and skills and want a supply-chain check before trusting them.

   Price: Free and open source under Apache 2.0; needs a Snyk account and API token. Fleet-wide background scanning reports into Snyk Evo, priced on request.

   Read our Snyk Agent Scan review
   3.8/5
7. 7

   GitHub Repos: Gateways, observability & guardrails

   C

   Cisco Skill Scanner

   Worth putting in front of your skills repo, as long as you believe its own numbers: it catches the obvious, not everything.

   Best for: Teams running an internal skills repository who want a scan gate before anything reaches developers.

   Price: Free under Apache 2.0; optional LLM and cloud analysers bill through their own providers.

   Read our Cisco Skill Scanner review
   3.7/5