Status: Stable.
canvas names a host service that reads and writes canvas state. It is a discovery-only reservation: v2 defines no portable operations or payload contract for it.
| Field | Value |
|---|---|
| witness: | claims-check |
| technical: | stable |
| adoption: | multi-witness |
| last witnessed: | myndhyve-2.46.13-c8d511d84.json — MyndHyve's legacy workflow-runtime (tier 2), suite 2.46.13, 2026-10-16; the host retired 2026-10-29 |
| peer-dependency id | canvas |
| advertised as | extensions.<org>.canvas |
| declared facets | none defined |
Contract boundary
A host MAY advertise canvas as extensions["<org>.canvas"], where <org> is its registered organization (capabilities.md §3.2). The record is organization-defined, so:
- a client MUST NOT infer portable operations, payloads, or authorization semantics from its presence;
- a pack may name
canvasas a dependency only when the host and pack share an out-of-band definition of it.
Conformance
The claims-check witness checks only that the discovery claim is well formed, not runtime behavior. conformance/src/scenarios/v2-ext-family-claims.test.ts records it under openwop.family.canvas:
- the key
<org>.canvasmatchesextensionsKeyPattern, and<org>is registered and not reserved; - the record is a JSON object;
canvasis not also a member of the discovery root.
A host that does not advertise the family records inapplicable. A Stable label on this page therefore means a host at evidence tier 2 or better advertises the reservation correctly. It does not mean two hosts interoperate on it (../README.md).
Sources: RFC 0144.