Zod Boundaries Skill

When to use

• Any time you accept external input (URL params, search params, form payloads, server-function inputs).

Workflow checklist

1. Define a schema close to the boundary (route module or a domain validator).
2. Parse early (parse/safeParse) and return typed data.
3. Keep schemas reusable (export from a domain module when shared).
4. Prefer explicit error messages suitable for UX; avoid leaking internals.
5. In server code, validate before DB writes.

Notes

• Use Zod as the single source of truth for both runtime validation and TS inference.