A plugin collection for auditing and hardening Linux systems, meaning checking and improving their resistance to attack. It includes the Linux security audit tool.

Use it when reviewing Linux security settings or preparing a host, mounted image, or container for a security assessment.

It gives coding agents a focused security-auditing workflow for Linux hosts and related system environments.

jonaslejon — Plugin by jonaslejon

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add jonaslejon/linux-security-audit-plugin

agentmods

npx agentmods add plugins/jonaslejon/linux-security-audit-plugin/marketplace

Clone the repo

git clone --depth 1 https://github.com/jonaslejon/linux-security-audit-plugin

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

jonaslejon scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json · 20 lines

What it actually says

{
  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
  "name": "jonaslejon",
  "description": "Linux security auditing for Claude Code",
  "owner": {
    "name": "Jonas Lejon",
    "url": "https://github.com/jonaslejon"
  },
  "plugins": [
    {
      "name": "linux-security-audit",
      "description": "Audit a Linux host's security hardening posture and produce a risk-ranked report. 461 checks across 33 areas: kernel sysctls and boot parameters, mount options, SUID/SGID, SELinux/AppArmor confinement, local privilege-escalation paths, the boot and service-start trust chain, TLS ciphers and mutual-TLS enforcement, web server hardening, cleartext secrets, image and template hygiene, and static-vs-runtime drift. Runs against a live host, a mounted image, or a container.",
      "version": "1.7.0",
      "author": { "name": "Jonas Lejon", "url": "https://github.com/jonaslejon" },
      "category": "security",
      "source": "./plugins/linux-security-audit"
    }
  ]
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 20 lines scan A 04f0dbc5faa8

Subscribe to this mod's changes

jonaslejon is a plugin published in the GitHub repository jonaslejon/linux-security-audit-plugin (13 stars, last pushed 18d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Security

jonaslejon

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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