diff --git a/.changeset/single-org-gate-membership-surfaces.md b/.changeset/single-org-gate-membership-surfaces.md
new file mode 100644
index 0000000000..7028503835
--- /dev/null
+++ b/.changeset/single-org-gate-membership-surfaces.md
@@ -0,0 +1,52 @@
+---
+"@objectstack/platform-objects": patch
+---
+
+fix(platform-objects): hide org/membership surfaces in single-org mode
+
+The platform gates multi-org features two ways — nav entries on
+`requiresService: 'org-scoping'` (e.g. setup-nav Organizations/Invitations)
+and object actions on `visible: 'features.multiOrgEnabled != false'` (e.g.
+`sys_organization.create_organization`). That convention had only been applied
+to a handful of spots, so a wide band of org/membership surface leaked into
+single-org deployments where it is pure noise or a broken affordance:
+
+- The Account app's "My Organizations" entry (`sys_member` / `mine` view) was
+  gated on `requiresObject: 'sys_member'` — but `sys_member` is a system object
+  that is always registered, so the gate never fired. In single-org there are
+  no `sys_organization` rows and no auto-stamped memberships, so the view is
+  always empty for every user. Re-gated on `requiresService: 'org-scoping'`.
+- The setup-nav "Teams" entry had no gate at all, while its sibling
+  Organizations/Invitations entries were correctly service-gated. Added
+  `requiresService: 'org-scoping'`.
+- Org/membership mutation actions rendered (and on toolbars, were clickable)
+  in single-org but hit better-auth endpoints that resolve an active org that
+  does not exist, failing at the API. Gated each on
+  `features.multiOrgEnabled != false`:
+  - `sys_user.invite_user` (the most exposed — the Users list is always
+    reachable in single-org)
+  - `sys_member.add_member` / `update_member_role` / `remove_member`, and
+    `transfer_ownership` (combined with its existing `record.role != 'owner'`
+    condition)
+  - `sys_team.create_team` / `update_team` / `remove_team`
+  - `sys_team_member.add_team_member` / `remove_team_member`
+  - `sys_invitation.invite_user` / `resend_invitation` / `cancel_invitation`
+    (recipient-side accept/reject stay record-gated; they are unreachable in
+    single-org anyway since no invitation rows exist)
+
+Also tightened the remaining single-org rough edges on these objects:
+
+- `sys_organization` admin actions (`update` / `delete` / `set_active` /
+  `leave` / `change_slug`) are now all gated on
+  `features.multiOrgEnabled != false`, joining the already-gated
+  `create_organization` — previously only create was gated.
+- `titleFormat` no longer renders a null organization: `sys_member` is titled
+  `'{user_id} ({role})'` (was `'… in {organization_id}'`) and `sys_invitation`
+  is titled `'Invitation for {email}'` (was `'Invitation to {organization_id}'`).
+  In single-org `organization_id` is null, so the old formats read "… in null".
+  The new fields are more useful identifiers in both modes.
+
+No behavior change in multi-org deployments (`OS_MULTI_ORG_ENABLED=true`):
+`features.multiOrgEnabled` is true and the `org-scoping` service is present, so
+every gate evaluates to visible exactly as before. This is metadata-only — no
+schema, API, or runtime changes.
diff --git a/packages/platform-objects/src/apps/account.app.ts b/packages/platform-objects/src/apps/account.app.ts
index 8403097d72..8325c347a9 100644
--- a/packages/platform-objects/src/apps/account.app.ts
+++ b/packages/platform-objects/src/apps/account.app.ts
@@ -109,7 +109,13 @@ export const ACCOUNT_APP: App = {
           objectName: 'sys_member',
           viewName: 'mine',
           icon: 'building-2',
-          requiresObject: 'sys_member',
+          // Membership is a multi-org concept: in single-org mode the
+          // `mine` view is always empty (no sys_organization rows, no
+          // auto-stamped memberships). Gate on the org-scoping service so
+          // this entry disappears entirely — matching Organizations/
+          // Invitations in setup-nav. `requiresObject: 'sys_member'` was
+          // the wrong gate (the system object is always registered).
+          requiresService: 'org-scoping',
         },
       ],
     },
diff --git a/packages/platform-objects/src/apps/setup-nav.contributions.ts b/packages/platform-objects/src/apps/setup-nav.contributions.ts
index 31685aaa56..adaeab8846 100644
--- a/packages/platform-objects/src/apps/setup-nav.contributions.ts
+++ b/packages/platform-objects/src/apps/setup-nav.contributions.ts
@@ -48,7 +48,7 @@ export const SETUP_NAV_CONTRIBUTIONS: NavigationContribution[] = [
     items: [
       { id: 'nav_users', type: 'object', label: 'Users', objectName: 'sys_user', icon: 'user' },
       { id: 'nav_business_units', type: 'object', label: 'Business Units', objectName: 'sys_business_unit', icon: 'building', requiresObject: 'sys_business_unit' },
-      { id: 'nav_teams', type: 'object', label: 'Teams', objectName: 'sys_team', icon: 'users-round' },
+      { id: 'nav_teams', type: 'object', label: 'Teams', objectName: 'sys_team', icon: 'users-round', requiresService: 'org-scoping' },
       { id: 'nav_organizations', type: 'object', label: 'Organizations', objectName: 'sys_organization', icon: 'building-2', requiresService: 'org-scoping' },
       { id: 'nav_invitations', type: 'object', label: 'Invitations', objectName: 'sys_invitation', icon: 'mail', requiresService: 'org-scoping' },
     ],
diff --git a/packages/platform-objects/src/identity/sys-invitation.object.ts b/packages/platform-objects/src/identity/sys-invitation.object.ts
index 6f6937d6e9..74e5d26ca1 100644
--- a/packages/platform-objects/src/identity/sys-invitation.object.ts
+++ b/packages/platform-objects/src/identity/sys-invitation.object.ts
@@ -26,7 +26,10 @@ export const SysInvitation = ObjectSchema.create({
     docsUrl: 'https://docs.objectstack.ai/adr/0010-metadata-protection',
   },
   description: 'Organization invitations for user onboarding',
-  titleFormat: 'Invitation to {organization_id}',
+  // Title by invitee email rather than organization_id: the latter is null in
+  // single-org mode (renders "Invitation to null"), and the recipient email is
+  // the more useful identifier in both modes anyway.
+  titleFormat: 'Invitation for {email}',
   compactLayout: ['email', 'organization_id', 'status'],
 
   // Custom actions — generic CRUD is suppressed (better-auth-managed).
@@ -41,6 +44,13 @@ export const SysInvitation = ObjectSchema.create({
       locations: ['list_toolbar'],
       type: 'api',
       target: '/api/v1/auth/organization/invite-member',
+      // Inviting/managing invitations is a multi-org-only flow (the
+      // endpoint resolves an active org absent in single-org mode). Gate
+      // the admin-side actions on the multi-org flag (mirrors
+      // sys_organization.create_organization). The recipient-side
+      // accept/reject actions below stay record-gated — they are
+      // unreachable in single-org anyway (no invitation rows exist).
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Invitation sent',
       refreshAfter: true,
       params: [
@@ -58,6 +68,7 @@ export const SysInvitation = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/cancel-invitation',
       recordIdParam: 'invitationId',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Cancel this invitation? The recipient will no longer be able to accept it.',
       successMessage: 'Invitation canceled',
       refreshAfter: true,
@@ -71,6 +82,7 @@ export const SysInvitation = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/invite-member',
       bodyExtra: { resend: true },
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Invitation resent',
       refreshAfter: true,
       params: [
diff --git a/packages/platform-objects/src/identity/sys-member.object.ts b/packages/platform-objects/src/identity/sys-member.object.ts
index 16d070e4fd..a41be46d54 100644
--- a/packages/platform-objects/src/identity/sys-member.object.ts
+++ b/packages/platform-objects/src/identity/sys-member.object.ts
@@ -26,7 +26,10 @@ export const SysMember = ObjectSchema.create({
     docsUrl: 'https://docs.objectstack.ai/adr/0010-metadata-protection',
   },
   description: 'Organization membership records',
-  titleFormat: '{user_id} in {organization_id}',
+  // Org-independent title: organization_id is null in single-org mode, so a
+  // '{user_id} in {organization_id}' format renders "… in null". User + role
+  // identifies the membership in both single- and multi-org deployments.
+  titleFormat: '{user_id} ({role})',
   compactLayout: ['user_id', 'organization_id', 'role'],
 
   // Row-level actions: better-auth `organization/update-member-role` and
@@ -48,6 +51,11 @@ export const SysMember = ObjectSchema.create({
       locations: ['list_toolbar'],
       type: 'api',
       target: '/api/v1/auth/organization/add-member',
+      // Org-membership mutations are multi-org-only: the better-auth
+      // endpoints resolve an active org that does not exist in single-org
+      // mode, so these actions would fail at the API. Gate every one on
+      // the multi-org flag (mirrors sys_organization.create_organization).
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Member added',
       refreshAfter: true,
       params: [
@@ -65,6 +73,7 @@ export const SysMember = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/update-member-role',
       recordIdParam: 'memberId',
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Member role updated',
       refreshAfter: true,
       params: [
@@ -81,6 +90,7 @@ export const SysMember = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/remove-member',
       recordIdParam: 'memberIdOrEmail',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Remove this member from the organization? They will lose access to all org resources.',
       successMessage: 'Member removed',
       refreshAfter: true,
@@ -102,7 +112,7 @@ export const SysMember = ObjectSchema.create({
       target: '/api/v1/auth/organization/update-member-role',
       recordIdParam: 'memberId',
       bodyExtra: { role: 'owner' },
-      visible: "record.role != 'owner'",
+      visible: "record.role != 'owner' && features.multiOrgEnabled != false",
       confirmText: 'Transfer ownership of this organization to the selected member? You will be demoted to admin and lose owner-only privileges.',
       successMessage: 'Ownership transferred',
       refreshAfter: true,
diff --git a/packages/platform-objects/src/identity/sys-organization.object.ts b/packages/platform-objects/src/identity/sys-organization.object.ts
index e49596f4d4..f8c4d127ba 100644
--- a/packages/platform-objects/src/identity/sys-organization.object.ts
+++ b/packages/platform-objects/src/identity/sys-organization.object.ts
@@ -66,6 +66,10 @@ export const SysOrganization = ObjectSchema.create({
       recordIdParam: 'organizationId',
       // better-auth `organization/update` nests editable fields under `data`.
       bodyShape: { wrap: 'data' },
+      // Org-admin actions are multi-org-only; hide them in single-org for
+      // consistency with `create_organization` (the org list is empty there,
+      // but this also guards direct record-URL access).
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Organization updated',
       refreshAfter: true,
       params: [
@@ -84,6 +88,7 @@ export const SysOrganization = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/delete',
       recordIdParam: 'organizationId',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Delete this organization? All members will lose access immediately. This cannot be undone.',
       successMessage: 'Organization deleted',
       refreshAfter: true,
@@ -102,6 +107,7 @@ export const SysOrganization = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/set-active',
       recordIdParam: 'organizationId',
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Active organization switched',
       refreshAfter: true,
     },
@@ -118,6 +124,7 @@ export const SysOrganization = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/leave',
       recordIdParam: 'organizationId',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Leave this organization? You will lose access to all of its resources.',
       successMessage: 'You have left the organization',
       refreshAfter: true,
@@ -139,6 +146,7 @@ export const SysOrganization = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/cloud/organizations/{id}/change-slug',
       method: 'POST',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Renaming the slug rewrites every platform subdomain for this org and parks the old slug for 90 days. Continue?',
       successMessage: 'Organization slug changed',
       refreshAfter: true,
diff --git a/packages/platform-objects/src/identity/sys-team-member.object.ts b/packages/platform-objects/src/identity/sys-team-member.object.ts
index f132e5e493..0e23d7d71b 100644
--- a/packages/platform-objects/src/identity/sys-team-member.object.ts
+++ b/packages/platform-objects/src/identity/sys-team-member.object.ts
@@ -42,6 +42,10 @@ export const SysTeamMember = ObjectSchema.create({
       locations: ['list_toolbar'],
       type: 'api',
       target: '/api/v1/auth/organization/add-team-member',
+      // Team membership lives under organizations — multi-org-only. Gate
+      // both mutations so they vanish in single-org (mirrors
+      // sys_organization.create_organization).
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Team member added',
       refreshAfter: true,
       params: [
@@ -62,6 +66,7 @@ export const SysTeamMember = ObjectSchema.create({
       locations: ['list_item'],
       type: 'api',
       target: '/api/v1/auth/organization/remove-team-member',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Remove this user from the team? They will lose any team-scoped access.',
       successMessage: 'Team member removed',
       refreshAfter: true,
diff --git a/packages/platform-objects/src/identity/sys-team.object.ts b/packages/platform-objects/src/identity/sys-team.object.ts
index 25dfb8c50e..2ae512dfcf 100644
--- a/packages/platform-objects/src/identity/sys-team.object.ts
+++ b/packages/platform-objects/src/identity/sys-team.object.ts
@@ -44,6 +44,10 @@ export const SysTeam = ObjectSchema.create({
       locations: ['list_toolbar'],
       type: 'api',
       target: '/api/v1/auth/organization/create-team',
+      // Teams are nested inside organizations — a multi-org-only concept.
+      // Gate every team mutation on the multi-org flag so the affordances
+      // disappear in single-org (mirrors sys_organization.create_organization).
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Team created',
       refreshAfter: true,
       params: [
@@ -64,6 +68,7 @@ export const SysTeam = ObjectSchema.create({
       target: '/api/v1/auth/organization/update-team',
       recordIdParam: 'teamId',
       bodyShape: { wrap: 'data' },
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Team updated',
       refreshAfter: true,
       params: [
@@ -82,6 +87,7 @@ export const SysTeam = ObjectSchema.create({
       type: 'api',
       target: '/api/v1/auth/organization/remove-team',
       recordIdParam: 'teamId',
+      visible: 'features.multiOrgEnabled != false',
       confirmText: 'Delete this team? Members will lose any team-scoped access. This cannot be undone.',
       successMessage: 'Team deleted',
       refreshAfter: true,
diff --git a/packages/platform-objects/src/identity/sys-user.object.ts b/packages/platform-objects/src/identity/sys-user.object.ts
index 850d58ff26..77482c6ba2 100644
--- a/packages/platform-objects/src/identity/sys-user.object.ts
+++ b/packages/platform-objects/src/identity/sys-user.object.ts
@@ -46,6 +46,13 @@ export const SysUser = ObjectSchema.create({
       locations: ['list_toolbar'],
       type: 'api',
       target: '/api/v1/auth/organization/invite-member',
+      // Org invitations are a multi-org-only flow (the endpoint resolves
+      // an active org that does not exist in single-org mode). Hide the
+      // affordance unless multi-org is enabled — matching the
+      // `create_organization` gate on sys_organization. This action is the
+      // most exposed of the set because the Users list is always reachable
+      // in single-org, unlike the org/membership lists.
+      visible: 'features.multiOrgEnabled != false',
       successMessage: 'Invitation sent',
       refreshAfter: true,
       params: [