chat is an AUP cross-device primitive, not a Web Device layout component and not a Web-only widget. It is one of the 18 names in AUP_PRIMITIVES and appears in every target's DeviceCaps.primitives map as native, webview, partial, or unsupported.
Contract
| Field | Value |
|---|---|
| Primitive name | chat |
| Layer | AUP cross-device primitive (AUP_PRIMITIVES) |
| Public status | unsupported (document) |
| Document capability | unsupported |
| Shared degradation chain | No shared document degradation chain |
| Author entry | AUP session · web-chat / web-full caps (DEVICE_CAPS_WEB_CHAT) |
| Document renderer / notes | Interactive renderers; not document-native |
| Showcase evidence | blocklets/showcase-dsl/.aup/pages/chat.aup (often composed with afs-list) |
When to use
Messaging surfaces that require session identity, channel lists, and message streams.
When not to use
Do not paste a chat shell into static docs. Identity and permission prerequisites apply.
Document sample
Not provided. Document reports unsupported for chat. There is no document degradation chain that invents a safe chat UI. Use Showcase chat and a real session for acceptance.
Evidence anchors
| Item | Value |
|---|---|
| Registry | packages/aup/src/aup-types.ts · AUP_PRIMITIVES |
| Document caps | providers/runtime/web-device/src/device-caps.ts · DEVICE_CAPS_DOCUMENT |
| Degradation | packages/aup/src/degradation.ts · DEGRADATION_CHAINS |
| Internal matrix | docs/aup/capability-matrix.md (internal, non-routed) |
| Taxonomy hub | Primitive taxonomy and evidence |
| Sample contract rules | Live examples: scope and contract |