OptionalappCanonical /mnt/{hash} path of the app's own repo mount (FILE_SHARING §11.2);
surfaced to apps via getAppMountPath(). Absent until the host reports it.
OptionalprotocolpostMessage envelope/protocol version.
OptionalreadyResolves when ports arrive, if they arrive async after register-frame.
OptionalregionThe chrome region this app instance occupies, e.g. "panel.agent" or
"stage.conversation" (UI_AS_APPS_SPEC §4.1); surfaced via getRegion().
Absent for a standalone app, in local dev, or on a host that doesn't report
it. Descriptive only — it grants nothing.
OptionalruntimeSandbox-runtime protocol version (semver).
OptionaltransportThe host channel the SDK talks over (MessagePort | message bus).
The sandbox runtime's pre-evaluation discovery global (§4).