domains`) — Parity Gap¶

Validator: v2 fabric-parity-loop · 4-phase check
Run date: 2026-05-26
Fabric reference: Fabric admin portal → Domains
Loom URL: https://loom-console-fvbbctd4eehqbkcs.b02.azurefd.net/admin/domains

Captures¶

Loom	Fabric
Live capture blocked by mid-session auth-expiry; structure reconstructed from `apps/fiab-console/app/admin/domains/page.tsx`	Microsoft Learn — `https://learn.microsoft.com/fabric/governance/domains` (multi-screenshot reference + tenant-setting docs at `service-admin-portal-domain-management-settings`)

Phase 1 — What Fabric provides¶

Fabric's Domains tab is a real CRUD surface for the entire data-domain governance model:

List of all domains in the tenant (with workspace count, contributor scope, parent domain).
Create new domain button → modal with Name (required), Description, Admins (people picker).
Per-domain detail page (clicking a domain row): full settings side-pane with tabs:
General settings — Name + Description.
Image — gallery to pick a thumbnail/color that shows in the OneLake catalog.
Admins — people picker (specifies who can edit the domain).
Contributors — people picker OR security group (specifies who can assign workspaces to the domain).
Default domain — sets users / security groups for whom new workspaces auto-assign here.
Delegated settings — overrides of tenant-level settings for this domain (Information protection default sensitivity label, Certification settings, etc.).
New subdomain action — creates a child domain.
Assign workspaces action — bulk-assign by workspace name OR by workspace admin / security group.
Domain admins (vs. Fabric admins) see only their own domains and can only edit description / contributors / image / delegated settings.
Backed by Domains - List Domains, Create Domain, Update Domain, Assign Workspaces Fabric admin REST APIs.

Phase 2 — What Loom provides¶

Source: apps/fiab-console/app/admin/domains/page.tsx:

export default function DomainsPage() {
  return (
    <AdminShell sectionTitle="Domains">
      <EmptyState icon="▣"
        title="No domains defined"
        body="Domains group workspaces into business areas (Finance, Operations, Marketing, etc.). The OneLake catalog and Govern tab respect the active domain selector."
        primaryAction={{ label: 'Add domain' }} />
    </AdminShell>
  );
}

Notice the primaryAction={{ label: 'Add domain' }} — there is no onClick handler. The button renders but does nothing.

No backend route — apps/fiab-console/app/api/admin/domains/ does not exist. No Cosmos container for domains. No Bicep module to provision a domain store.

Phase 3 — Gap matrix¶

Fabric element	Loom	Severity
Domain list (with name, workspace count, parent, contributor scope)	Absent — only an empty-state message	BLOCKER
Create new domain modal	Loom shows a button labelled "Add domain" but the button has no `onClick` handler — it is dead	BROKEN (per `no-vaporware.md`)
Per-domain settings side-pane (6 tabs)	Absent	BLOCKER
New subdomain	Absent	BLOCKER
Assign workspaces (by name / admin / group)	Absent	BLOCKER
Domain image / icon picker	Absent	MAJOR
Domain admins / contributors people picker	Absent	BLOCKER
Default-domain mechanism	Absent	MAJOR
Delegated tenant settings (info protection default label, cert settings)	Absent	MAJOR (and dependent on the missing tenant-settings backend)
Persistence layer (Cosmos / DB / file)	Absent	BLOCKER
Bicep / bootstrap to provision domain store	Absent	BLOCKER
Honest MessageBar saying "Domains not implemented in this Loom build"	Absent — instead the page implies "No domains defined" (suggesting a domain CAN be defined here)	MAJOR

Phase 4 — Functional verification¶

Control	Expected behaviour	Actual
Click "Add domain" button	Should open Create domain modal	BROKEN — button renders but has no `onClick`; clicking it does nothing. This is a textbook `no-vaporware.md` violation: "Buttons with no click handler" is explicitly listed under "What's explicitly forbidden".
Page text "No domains defined"	Implies there's a way to define one in this UI	Misleading — there isn't.

Grade: F¶

The "Add domain" button is a vaporware violation per .claude/rules/no-vaporware.md.
The "No domains defined" framing is misleading: a user reasonably expects to click the button and define one.
To get out of F: replace the EmptyState with a Fluent MessageBar intent="warning" stating the actual state ("Loom does not implement Fabric domains in this build. Domains require a Cosmos container loom-domains, an admin API at /api/admin/domains, and a bicep module under platform/fiab/bicep/modules/governance/domains.bicep. Tracked under v3.5.") OR build the feature.
This is one of the worst offenders in the admin portal — silent dead button + misleading copy.

Admin Portal — Domains (/admin/domains) — Parity Gap¶