Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ersinkoc/security-checknpx agentmods add skills/ersinkoc/security-check/sc-lang-phpWrote 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-lang-php)<a href="https://agentmods.dev/skills/ersinkoc/security-check/sc-lang-php"><img src="https://agentmods.dev/badge/skills/ersinkoc/security-check/sc-lang-php/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.
<a href="https://agentmods.dev/skills/ersinkoc/security-check/sc-lang-php"><img src="https://agentmods.dev/badge/skills/ersinkoc/security-check/sc-lang-php.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to critical
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- critical YARA Match · line 87 YARA rule matched a known webshell pattern (PHP, Python, JSP, or ASPX webshell).Fix: Remove the webshell code immediately. Webshells provide unauthorized remote command execution. Audit the skill for additional backdoors or persistence mechanisms.
- critical YARA Match · line 195 YARA rule matched a known webshell pattern (PHP, Python, JSP, or ASPX webshell).Fix: Remove the webshell code immediately. Webshells provide unauthorized remote command execution. Audit the skill for additional backdoors or persistence mechanisms.
- high Privilege Escalation · line 52 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- high Privilege Escalation · line 165 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00010 | $0.01996 |
| Opus 5.5 | $0.00004 | $0.00798 |
| Sonnet 5.5 | $0.00002 | $0.00399 |
| Haiku 4.5 | $0.00001 | $0.00200 |
Grade A, and why
sc-lang-php 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 1mo 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 — 274 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SC: PHP Security Deep Scan
Purpose
Detects PHP-specific security anti-patterns including deserialization gadgets, type juggling, include-based attacks, and framework-specific vulnerabilities in Laravel and WordPress. Focuses on PHP's unique type system, legacy functions, and common misconfigurations.
Activation
Activates when PHP is detected in security-report/architecture.md.
Checklist Reference
References references/php-security-checklist.md.
PHP-Specific Vulnerability Patterns
Category 1: unserialize() POP Chains
// VULNERABLE: Unserializing user input → RCE via magic methods
$data = unserialize($_POST['data']); // __wakeup, __destruct chain
// SAFE: Use JSON or restrict classes
$data = json_decode($_POST['data'], true);
$data = unserialize($input, ['allowed_classes' => false]);
Category 2: phar:// Deserialization
// VULNERABLE: phar:// triggers deserialization without unserialize()
file_exists("phar://" . $_GET['file']); // Triggers metadata deserialization!
// Also: file_get_contents, fopen, is_dir, etc.
// SAFE: Validate file path, never use user input in phar://
Category 3: include/require LFI/RFI
// VULNERABLE: User input in include path
include($_GET['page'] . '.php'); // LFI: ?page=../../etc/passwd%00
// SAFE: Allowlist
$allowed = ['home', 'about', 'contact'];
$page = in_array($_GET['page'], $allowed) ? $_GET['page'] : 'home';
include($page . '.php');
Category 4: extract() Variable Overwrite
// VULNERABLE: Overwrites existing variables including auth vars
extract($_POST); // If POST contains 'isAdmin=1' → $isAdmin = 1
// SAFE: Never use extract() on user input; use specific variables
$name = $_POST['name'];
Category 5: Type Juggling (== vs ===)
// VULNERABLE: Loose comparison type juggling
if ($_POST['password'] == $storedHash) { /* ... */ } // "0" == "0e462097..." is TRUE!
if (strcmp($_POST['token'], $expectedToken) == 0) { /* ... */ }
// strcmp([], "string") returns NULL, and NULL == 0 is TRUE!
// SAFE: Strict comparison
if ($_POST['password'] === $storedHash) { /* ... */ }
if (hash_equals($expectedToken, $_POST['token'])) { /* ... */ }
What ships with it
1 file beside SKILL.md 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.
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.
- 1mo ago First seen · 274 lines · 10 tokens per session scan A ad261e886efa
sc-lang-php is a skill published in the GitHub repository ersinkoc/security-check (83 stars, last pushed 17d ago), licensed MIT. It adds 10 tokens to every session and 1,996 once invoked, about $0.0000 per session on Opus 5.5. 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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