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security-hardening

Application security covering input validation, auth, headers, secrets management, and dependency auditing

skills/security-hardening/SKILL.md

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# Security Hardening

## Input Validation

Validate all input at the boundary. Never trust client-side validation alone.

```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(13).max(150),
});