application-security: Security & Code Review for AI Agents | OpenAgentSkill

Overview

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Application Security Skill

Secure coding patterns, vulnerability prevention, and security tooling for web applications.

OWASP Top 10 (2021) with Code Examples

A01: Broken Access Control

// BAD - No authorization check
app.get('/api/users/:id', async (req, res) => {
  const user = await db.user.findUnique({ where: { id: req.params.id } });
  res.json(user);
});

// GOOD - Verify ownership or role
app.get('/api/users/:id', authenticate, async (req, res) => {
  if (req.user.id !== req.params.id && req.user.role !== 'ADMIN') {
    return res.status(403).json({ error: 'Forbidden' });
  }
  const user = await db.user.findUnique({ where: { id: req.params.id } });
  res.json(user);
});

A02: Cryptographic Failures

// BAD - Weak hashing
import crypto from 'crypto';
const hash = crypto.createHash('md5').update(password).digest('hex');

// GOOD - Use bcrypt with proper rounds
import bcrypt from 'bcrypt';
const hash = await bcrypt.hash(password, 12);
const isValid = await bcrypt.compare(password, hash);

A03: Injection

// BAD - SQL injection
const query = `SELECT * FROM users WHERE email = '${email}'`;

// GOOD - Parameterized queries (Prisma handles this automatically)
const user = await prisma.user.findUnique({ where: { email } });

// GOOD - Parameterized raw SQL when needed
const users = await prisma.$queryRaw`SELECT * FROM users WHERE email = ${email}`;

A07: Cross-Site Scripting (XSS)

// BAD - Rendering raw HTML
element.innerHTML = userInput;

// GOOD - Use textContent or framework escaping
element.textContent = userInput;

// GOOD - React auto-escapes by default
return <div>{userInput}</div>;

// BAD in React - dangerouslySetInnerHTML
return <div dangerouslySetInnerHTML={{ __html: userInput }} />;

Content Security Policy (CSP)

Recommended Headers

// Next.js middleware
import { NextResponse } from 'next/server';

export function middleware(request: Request) {
  const nonce = crypto.randomUUID();
  const csp = [
    `default-src 'self'`,
    `script-src 'self' 'nonce-${nonce}'`,
    `style-src 'self' 'unsafe-inline'`,
    `img-src 'self' data: https:`,
    `font-src 'self'`,
    `connect-src 'self' https://api.example.com`,
    `frame-ancestors 'none'`,
    `base-uri 'self'`,
    `form-action 'self'`,
  ].join('; ');

  const response = NextResponse.next();
  response.headers.set('Content-Security-Policy', csp);
  response.headers.set('X-Content-Type-Options', 'nosniff');
  response.headers.set('X-Frame-Options', 'DENY');
  response.headers.set('Referrer-Policy', 'strict-origin-when-cross-origin');
  response.headers.set('Permissions-Policy', 'camera=(), microphone=(), geolocation=()');
  return response;
}

SAST/DAST Tooling

Static Analysis (SAST)

Tool	Language	Usage
ESLint security plugins	JS/TS	`eslint-plugin-security`, `@microsoft/eslint-plugin-sdl`
Semgrep	Multi	`semgrep --config=auto .`
Bandit	Python	`bandit -r src/`
gosec	Go	`gosec ./...`
cargo-audit	Rust	`cargo audit`

Dynamic Analysis (DAST)

Tool	Purpose	Usage
OWASP ZAP	Web app scanning	Proxy-based scanner, API scan mode
Nuclei	Vulnerability scanning	Template-based scanner
Burp Suite	Manual + automated	Professional penetration testing

Dependency Scanning

# Node.js
npm audit
npm audit fix

# Python
pip-audit
safety check

# Go
govulncheck ./...

# Rust
cargo audit

Input Validation Patterns

Server-Side Validation (Always Required)

import { z } from 'zod';

const CreateUserSchema = z.object({
  email: z.string().email().max(255),
  name: z.string().min(1).max(100).regex(/^[a-zA-Z\s'-]+$/),
  age: z.number().int().min(0).max(150).optional(),
});

function createUser(input: unknown) {
  const validated = CreateUserSchema.parse(input);
  // validated is now typed and safe
}

Rate Limiting

import rateLimit from 'express-rate-limit';

const authLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 5, // 5 attempts per window
  message: 'Too many login attempts, please try again later',
  standardHeaders: true,
  legacyHeaders: false,
});

app.use('/api/auth/login', authLimiter);

Security Checklist

~/.claude/docs/reference/checklists/security-hardening.md - Security hardening checklist
~/.claude/agents/security-auditor.md - Security audit agent
~/.claude/skills/authentication-patterns/SKILL.md - Auth patterns

Secure by default. Validate at boundaries. Defense in depth.

View source ↗

File metadata

name: application-security
description: >-
  OWASP Top 10 with code examples, SAST/DAST tools, dependency scanning, CSP headers, and input validation patterns. Use when hardening applications, reviewing security posture, or implementing defensive coding practices.

View original text

---
name: application-security
description: >-
  OWASP Top 10 with code examples, SAST/DAST tools, dependency scanning, CSP headers, and input validation patterns. Use when hardening applications, reviewing security posture, or implementing defensive coding practices.
---

# Application Security Skill

Secure coding patterns, vulnerability prevention, and security tooling for web applications.

---

## OWASP Top 10 (2021) with Code Examples

### A01: Broken Access Control

```typescript
// BAD - No authorization check
app.get('/api/users/:id', async (req, res) => {
  const user = await db.user.findUnique({ where: { id: req.params.id } });
  res.json(user);
});

// GOOD - Verify ownership or role
app.get('/api/users/:id', authenticate, async (req, res) => {
  if (req.user.id !== req.params.id && req.user.role !== 'ADMIN') {
    return res.status(403).json({ error: 'Forbidden' });
  }
  const user = await db.user.findUnique({ where: { id: req.params.id } });
  res.json(user);
});
```

### A02: Cryptographic Failures

```typescript
// BAD - Weak hashing
import crypto from 'crypto';
const hash = crypto.createHash('md5').update(password).digest('hex');

// GOOD - Use bcrypt with proper rounds
import bcrypt from 'bcrypt';
const hash = await bcrypt.hash(password, 12);
const isValid = await bcrypt.compare(password, hash);
```

### A03: Injection

```typescript
// BAD - SQL injection
const query = `SELECT * FROM users WHERE email = '${email}'`;

// GOOD - Parameterized queries (Prisma handles this automatically)
const user = await prisma.user.findUnique({ where: { email } });

// GOOD - Parameterized raw SQL when needed
const users = await prisma.$queryRaw`SELECT * FROM users WHERE email = ${email}`;
```

### A07: Cross-Site Scripting (XSS)

```typescript
// BAD - Rendering raw HTML
element.innerHTML = userInput;

// GOOD - Use textContent or framework escaping
element.textContent = userInput;

// GOOD - React auto-escapes by default
return <div>{userInput}</div>;

// BAD in React - dangerouslySetInnerHTML
return <div dangerouslySetInnerHTML={{ __html: userInput }} />;
```

---

## Content Security Policy (CSP)

### Recommended Headers

```typescript
// Next.js middleware
import { NextResponse } from 'next/server';

export function middleware(request: Request) {
  const nonce = crypto.randomUUID();
  const csp = [
    `default-src 'self'`,
    `script-src 'self' 'nonce-${nonce}'`,
    `style-src 'self' 'unsafe-inline'`,
    `img-src 'self' data: https:`,
    `font-src 'self'`,
    `connect-src 'self' https://api.example.com`,
    `frame-ancestors 'none'`,
    `base-uri 'self'`,
    `form-action 'self'`,
  ].join('; ');

  const response = NextResponse.next();
  response.headers.set('Content-Security-Policy', csp);
  response.headers.set('X-Content-Type-Options', 'nosniff');
  response.headers.set('X-Frame-Options', 'DENY');
  response.headers.set('Referrer-Policy', 'strict-origin-when-cross-origin');
  response.headers.set('Permissions-Policy', 'camera=(), microphone=(), geolocation=()');
  return response;
}
```

---

## SAST/DAST Tooling

### Static Analysis (SAST)

| Tool | Language | Usage |
|------|----------|-------|
| ESLint security plugins | JS/TS | `eslint-plugin-security`, `@microsoft/eslint-plugin-sdl` |
| Semgrep | Multi | `semgrep --config=auto .` |
| Bandit | Python | `bandit -r src/` |
| gosec | Go | `gosec ./...` |
| cargo-audit | Rust | `cargo audit` |

### Dynamic Analysis (DAST)

| Tool | Purpose | Usage |
|------|---------|-------|
| OWASP ZAP | Web app scanning | Proxy-based scanner, API scan mode |
| Nuclei | Vulnerability scanning | Template-based scanner |
| Burp Suite | Manual + automated | Professional penetration testing |

### Dependency Scanning

```bash
# Node.js
npm audit
npm audit fix

# Python
pip-audit
safety check

# Go
govulncheck ./...

# Rust
cargo audit
```

---

## Input Validation Patterns

### Server-Side Validation (Always Required)

```typescript
import { z } from 'zod';

const CreateUserSchema = z.object({
  email: z.string().email().max(255),
  name: z.string().min(1).max(100).regex(/^[a-zA-Z\s'-]+$/),
  age: z.number().int().min(0).max(150).optional(),
});

function createUser(input: unknown) {
  const validated = CreateUserSchema.parse(input);
  // validated is now typed and safe
}
```

### Rate Limiting

```typescript
import rateLimit from 'express-rate-limit';

const authLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 5, // 5 attempts per window
  message: 'Too many login attempts, please try again later',
  standardHeaders: true,
  legacyHeaders: false,
});

app.use('/api/auth/login', authLimiter);
```

---

## Security Checklist

- [ ] All user input validated server-side
- [ ] Parameterized queries for all database operations
- [ ] CSP headers configured
- [ ] Rate limiting on auth endpoints
- [ ] CORS properly restricted
- [ ] Secrets in environment variables, not code
- [ ] Dependencies scanned for vulnerabilities
- [ ] Authentication tokens in httpOnly cookies
- [ ] HTTPS enforced in production
- [ ] Error messages don't leak internal details

---

## Related Resources

- `~/.claude/docs/reference/checklists/security-hardening.md` - Security hardening checklist
- `~/.claude/agents/security-auditor.md` - Security audit agent
- `~/.claude/skills/authentication-patterns/SKILL.md` - Auth patterns

---

_Secure by default. Validate at boundaries. Defense in depth._

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
The SKILL.md covers only a subset of OWASP Top 10 (A01, A02, A03, A07) and omits others like A04, A05, A06, A08, A09, A10.
The security checklist appears truncated at the end.
The parsed description metadata shows 'description': '>-' which may be a parsing artifact, but the actual description is clear.
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 95 GitHub stars
Stars/forks activity: 95 stars, 23 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access

Open full audit

Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: travisjneuman/.claude
License: MIT
Version: 1.0.0
Last GitHub push: Sep 5, 2026
Registry updated: Sep 7, 2026
Instruction path: skills/application-security/SKILL.md @ 0e5a7dfe253b

Version reported in registry metadata; check source releases before relying on it.

Quality

67/100

Promising

Trust

51/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20application-security%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20application-security%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/travisjneuman-application-security/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/travisjneuman-application-security"
  }
}

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Creator: travisjneuman
Source: travisjneuman/.claude
Indexed by: OpenAgentSkill community index

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