diff --git a/apps/desktop/src/app/gateway/hooks/use-gateway-boot.ts b/apps/desktop/src/app/gateway/hooks/use-gateway-boot.ts
index 10d43d99e8..ecaa77c00c 100644
--- a/apps/desktop/src/app/gateway/hooks/use-gateway-boot.ts
+++ b/apps/desktop/src/app/gateway/hooks/use-gateway-boot.ts
@@ -18,6 +18,7 @@ import {
 } from '@/store/boot'
 import {
   $gateway,
+  activeGatewayConnectionId,
   closeLegacySecondaryGateways,
   closeSecondaryGateways,
   configureGatewayRegistry,
@@ -31,6 +32,7 @@ import {
   reportPrimaryGatewayState,
   setPrimaryGateway,
   setPrimaryGatewayConnection,
+  setPrimaryGatewayConnectionId,
   touchSecondaryGateways
 } from '@/store/gateway'
 import { registerGatewayReconnect } from '@/store/gateway-reconnect'
@@ -185,6 +187,7 @@ export function useGatewayBoot({
             }
           : null
       )
+      setPrimaryGatewayConnectionId(next?.connectionId)
     }
 
     if (!desktop) {
@@ -737,9 +740,17 @@ export function useGatewayBoot({
 
     const sourceProfile = normalizeProfileKey($activeGatewayProfile.get())
 
-    const offEvent = gateway.onEvent(event =>
-      callbacksRef.current.handleGatewayEvent({ ...event, profile: sourceProfile })
-    )
+    const offEvent = gateway.onEvent(event => {
+      const connectionId = activeGatewayConnectionId()
+      const scopedEvent = {
+        ...event,
+        profile: sourceProfile,
+        ...(connectionId ? { connectionId } : {})
+      }
+
+      recordSessionEventScope(scopedEvent)
+      callbacksRef.current.handleGatewayEvent(scopedEvent)
+    })
 
     // Wake signals: power resume (macOS/Windows), network coming back, and the
     // window regaining focus/visibility. Each nudges an immediate reconnect.
diff --git a/apps/desktop/src/store/gateway-connection-scope.test.ts b/apps/desktop/src/store/gateway-connection-scope.test.ts
index bd86ec20b1..ead38b7c98 100644
--- a/apps/desktop/src/store/gateway-connection-scope.test.ts
+++ b/apps/desktop/src/store/gateway-connection-scope.test.ts
@@ -40,14 +40,17 @@ vi.mock('@/store/session', () => ({
 vi.mock('@/store/notify-baseline', () => ({ markNativeNotifyBaseline: vi.fn() }))
 
 const {
+  activeGatewayConnectionId,
   closeLegacySecondaryGateways,
   closeSecondaryGateways,
   configureGatewayRegistry,
   ensureGatewayForAgent,
   openGatewayForAgent,
   pruneSecondaryGateways,
-  setPrimaryGateway
+  setPrimaryGateway,
+  setPrimaryGatewayConnectionId
 } = await import('./gateway')
+const { setApiRequestConnection } = await import('@/hermes')
 
 function installDesktop(): void {
   ;(window as unknown as { hermesDesktop: unknown }).hermesDesktop = {
@@ -85,6 +88,25 @@ afterEach(() => {
   delete (window as unknown as { hermesDesktop?: unknown }).hermesDesktop
 })
 
+describe('primary gateway registry scope', () => {
+  it('publishes a registered primary connection id for ambient API/WebSocket helpers', () => {
+    setPrimaryGateway({ connectionState: 'open' } as never, 'default')
+    setPrimaryGatewayConnectionId(' homelab-ssh ')
+
+    expect(activeGatewayConnectionId()).toBe('homelab-ssh')
+    expect(setApiRequestConnection).toHaveBeenLastCalledWith('homelab-ssh')
+  })
+
+  it('clears primary connection scope when the primary becomes legacy/local again', () => {
+    setPrimaryGateway({ connectionState: 'open' } as never, 'default')
+    setPrimaryGatewayConnectionId('homelab-ssh')
+    setPrimaryGateway({ connectionState: 'open' } as never, 'default')
+
+    expect(activeGatewayConnectionId()).toBeNull()
+    expect(setApiRequestConnection).toHaveBeenLastCalledWith(null)
+  })
+})
+
 describe('pruneSecondaryGateways with registry-scoped entries', () => {
   it('keeps the previous source socket open when Sessions switches backends', async () => {
     await ensureGatewayForAgent('work', 'default')
diff --git a/apps/desktop/src/store/gateway.ts b/apps/desktop/src/store/gateway.ts
index 854106b11f..d646515b7b 100644
--- a/apps/desktop/src/store/gateway.ts
+++ b/apps/desktop/src/store/gateway.ts
@@ -226,11 +226,23 @@ export function setPrimaryGateway(gateway: HermesGateway | null, profile = 'defa
 
   g.primaryGateway = gateway
   g.primaryProfile = next
+
+  if (g.activeKey === g.primaryProfile) {
+    setApiRequestConnection(g.primaryConnectionId)
+  }
+}
+
+export function setPrimaryGatewayConnectionId(connectionId: null | string | undefined): void {
+  g.primaryConnectionId = (connectionId ?? '').trim() || null
+
+  if (g.activeKey === g.primaryProfile) {
+    setApiRequestConnection(g.primaryConnectionId)
+  }
 }
 
 /** Publish the registry source owned by the window primary socket. */
 export function setPrimaryGatewayConnection(connection: Pick<HermesConnection, 'connectionId'> | null): void {
-  g.primaryConnectionId = connection?.connectionId?.trim() || null
+  setPrimaryGatewayConnectionId(connection?.connectionId)
 }
 
 function isPrimaryRegistryRoute(connectionId: null | string, profile: string): boolean {
@@ -276,7 +288,7 @@ export function activeGateway(): HermesGateway | null {
  */
 export function activeGatewayConnectionId(): null | string {
   if (g.activeKey === g.primaryProfile) {
-    return null
+    return g.primaryConnectionId
   }
 
   return g.secondaries.get(g.activeKey)?.connectionId ?? null