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.
npx skills add ersinkoc/security-check --skill sc-xssgit clone --depth 1 https://github.com/ersinkoc/security-checkWrote 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.
[](https://agentmods.dev/skills/ersinkoc/security-check/sc-xss)<a href="https://agentmods.dev/skills/ersinkoc/security-check/sc-xss"><img src="https://agentmods.dev/badge/skills/ersinkoc/security-check/sc-xss.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00024 | $0.01716 |
| Opus 5 | $0.00012 | $0.00858 |
| Sonnet 5 | $0.00005 | $0.00343 |
| Haiku 4.5 | $0.00002 | $0.00172 |
Grade A, and why
sc-xss scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SC: Cross-Site Scripting (XSS)
Purpose
Detects Cross-Site Scripting vulnerabilities across three categories: Reflected XSS (input reflected in response), Stored XSS (input persisted and rendered to other users), and DOM-based XSS (client-side JavaScript manipulation). Covers all major frontend frameworks and template engines, identifying cases where auto-escaping is bypassed.
Activation
Called by sc-orchestrator during Phase 2. Runs against all web applications and APIs returning HTML.
Phase 1: Discovery
File Patterns to Search
**/*.html, **/*.htm, **/*.ejs, **/*.hbs, **/*.pug, **/*.jade,
**/*.tsx, **/*.jsx, **/*.vue, **/*.svelte, **/*.php, **/*.blade.php,
**/*.erb, **/*.haml, **/*.jinja2, **/*.twig, **/*.cshtml, **/*.razor,
**/*.thymeleaf, **/*.ftl, **/templates/*, **/views/*,
**/*.ts, **/*.js (for DOM-based XSS)
Keyword Patterns to Search
# DOM-based XSS sinks
"innerHTML", "outerHTML", "document.write(", "document.writeln(",
"insertAdjacentHTML", ".html(", "$.html(",
"eval(", "setTimeout(.*,.*string", "setInterval(.*,.*string",
"location.href =", "location.assign(", "location.replace(",
"window.open(", "document.cookie"
# Framework-specific unsafe rendering
"dangerouslySetInnerHTML" # React
"v-html" # Vue
"[innerHTML]", "bypassSecurityTrust" # Angular
"{@html" # Svelte
"{!! !!}" # Laravel Blade (unescaped)
"| safe", "{% autoescape off %}", "mark_safe" # Django/Jinja2
"<%= %>" # ERB (unescaped)
"Html.Raw(" # ASP.NET Razor
"th:utext" # Thymeleaf (unescaped)
# Server-side reflected output
"res.send(", "res.write(", "response.write("
"echo ", "print ", "Response.Write("
Data Flow Tracing
Sources (user input reaching client):
- URL parameters → reflected in HTML response
- Form data → stored in database → rendered in views
document.location,document.URL,document.referrer(DOM sources)window.name,postMessagedata- URL hash (
location.hash)
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.
- 8d ago First seen · 160 lines · 24 tokens per session scan A 8a9dfbfc0a3f
sc-xss is a skill published in the GitHub repository ersinkoc/security-check (56 stars, last pushed 2mo ago), licensed MIT. It adds 24 tokens to every session and 1,716 once invoked, about $0.0001 per session on Opus 5. 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.
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