validation-boundary

Boundary validation with Zod prevents untrusted HTTP, CLI, or queue data from reaching core logic by parsing incoming payloads at the system edge. This ensures downstream functions only execute with strongly-typed, structurally validated data.

Branded types with Zod schemas enforce strong validation guarantees by tagging parsed data at the boundary layer. This prevents invalid values from slipping through into business logic, ensuring only verified data is used.

Yes, this boundary validation approach works with CLI commands and message queues. It applies Zod schemas to parse and validate any external inputs before business logic executes.

The best way to standardize error handling for untrusted data in TypeScript is to enforce Zod schema validation at the system boundary. This standardizes error handling at the boundary and reduces runtime errors in core logic.

Yes, you need Zod schemas to enforce this boundary-layer approach. The Skill requires Zod schemas to validate external inputs and produce the strongly-typed data needed for strict boundary enforcement.