# Build Data

> Build a feature's data/ layer — data-type namespaces and the State spec. The first, foundational feature phase.

- Skill: `adobe/build-data-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add adobe/build-data-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/adobe/build-data-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Adobe (https://skillmd.com/u/adobe)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/adobe/build-data-2

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Create the feature's `data/` layer (pure spec; depends on nothing but `@adobe/data`
and other `data/` declarations):

- one namespace folder per data type — `<type>/{<type>.ts, schema.ts, public.ts, <helper>.ts}`;
- `data/state/` — the `State` aggregate plus its pure transforms/derivations.

The schema is the single source of truth; the type derives from it (`Schema.ToType`).
Helpers are pure and unit-tested. Run this first — every other layer imports `data/`.

The how is in the auto-loading rules: `features/data/index.md`, `data/state.md`, and
`namespace.md`.