| Field | Value |
|---|---|
| witness: | claims-check |
| technical: | experimental |
| adoption: | none |
| peer-dependency id | a2uiSurface |
| advertised as | extensions.<org>.a2uiSurface (RFC 0169 §A.4) — never a root key |
| owning RFC | RFC 0114 |
Status: Draft · v2.0.0-rc (2026-09-03). Extension document (RFC 0169 §B.3; RFC 0167 Axiom 1: a family that cannot be witnessed unaided lives here and is not a core obligation).
What it is
RFC 0169 §C.5 (deltaTransport claims-check; ext/ unless a behavioral witness lands) The v1 prose that defines the surface is spec/v1/capabilities.md (root key a2uiSurface, RFC 0114); it stands as the definition until this document carries its own normative text (P3-E and the Phase 4 host legs). A host that serves this surface advertises it under extensions.<org>.a2uiSurface with the RFC 0169 record shape; a pack that requires it names a2uiSurface in peerDependencies (RFC 0177 §B.1).
Witness
claims-check: the suite can read the claim from discovery but has no behavioral probe; adoption is measured by the INTEROP-MATRIX bundle evidence.