# ThirdX (3X)

> A design discipline for model-facing interfaces, after UX and DX —
> evidence-based design patterns for LLM interfaces. This site is its
> front door; the page is deliberately minimal while the catalog is
> assembled.

- [The page, linearized](https://thirdx.design/index.md): the complete
  current content of thirdx.design as clean markdown — definition,
  status, lineage, and the discipline's welfare firewall (its scoping
  statement: no claims about consciousness or moral patienthood).