What is frontend-mobile-security?

An add-on for protecting websites and mobile apps against common attacks such as cross-site scripting and cross-site request forgery. It also covers browser security policies and safer storage of sensitive data.

Use it to add XSS and CSRF protections, configure content security policies, and apply security patterns to frontend and mobile code.

It helps reduce the risk that malicious input, forged requests, or exposed stored data will compromise an application.

frontend-mobile-security — Plugin for Claude Code by HermeticOrmus

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.

Clone the repo

git clone --depth 1 https://github.com/HermeticOrmus/LibreUIUX-Claude-Code

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security/github.svg)](https://agentmods.dev/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security)

Your own site

<a href="https://agentmods.dev/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security"><img src="https://agentmods.dev/badge/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security"><img src="https://agentmods.dev/badge/plugins/hermeticormus/libreuiux-claude-code/frontend-mobile-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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

When invoked not measured The manifest loads nothing itself; its 1 command, 2 agents cost 95 tokens a session between them.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

frontend-mobile-security 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 19d 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.

plugins/frontend-mobile-security/.claude-plugin/plugin.json · 20 lines

What it actually says

{
  "name": "frontend-mobile-security",
  "version": "1.2.0",
  "description": "XSS prevention, CSRF protection, content security policies, mobile app security, and secure storage patterns",
  "author": {
    "name": "Seth Hobson",
    "url": "https://github.com/wshobson"
  },
  "homepage": "https://github.com/HermeticOrmus/LibreUIUX-Claude-Code",
  "repository": "https://github.com/HermeticOrmus/LibreUIUX-Claude-Code",
  "license": "MIT",
  "keywords": [
    "frontend-security",
    "mobile-security",
    "xss",
    "csrf",
    "csp"
  ]
}

Contents

What it installs

The manifest is a name and a version. 1 command, 2 agents travel with it, and installing the plugin installs all of them — 95 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Files

What ships with it

1 file beside plugin.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

marketplace.json 63 KB

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.

19d ago Changed · -10 lines 207e5f5d2eed
1mo ago First seen · 30 lines scan A 486c851ab693

Subscribe to this mod's changes

frontend-mobile-security is a plugin published in the GitHub repository HermeticOrmus/LibreUIUX-Claude-Code (115 stars, last pushed 15d 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 2026-09-03.

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