Zod Schema Validation

This gives Claude solid patterns for Zod validation in TypeScript projects. You get practical examples for API boundary validation, form integration with react-hook-form, and proper error handling. The discriminated unions and recursive schema examples are genuinely useful for complex data structures. It covers the essentials like safeParse over parse, transform and refine methods, and type inference with z.infer. Good default if you're building APIs or forms and want consistent validation without writing the boilerplate yourself. The performance notes about precompiling schemas and avoiding render function creation are worth following.