diff --git a/docs/architecture/pwa-self-hosted.md b/docs/architecture/pwa-self-hosted.md
index 3121766e1..e3ab98344 100644
--- a/docs/architecture/pwa-self-hosted.md
+++ b/docs/architecture/pwa-self-hosted.md
@@ -70,7 +70,9 @@ direct `window.electron` or `DataService.getAppEnvironment()` checks. Keep
 feature decisions expressed as capabilities such as `supportsEpg`,
 `supportsSqlite`, `supportsXtreamSqliteDataSource`, `supportsDownloads`, or
 `supportsManagedExternalPlayers` so PWA and Electron behavior stays auditable
-from one shared boundary.
+from one shared boundary. `supportsManagedExternalPlayers` requires the MPV and
+VLC preload launch methods (`openInMpv` and `openInVlc`); a partial Electron
+bridge must not expose managed external-player actions in the PWA/shared UI.
 
 ## Runtime Limitations
 
diff --git a/libs/services/src/lib/runtime-capabilities.service.spec.ts b/libs/services/src/lib/runtime-capabilities.service.spec.ts
index db2067c97..65392cc91 100644
--- a/libs/services/src/lib/runtime-capabilities.service.spec.ts
+++ b/libs/services/src/lib/runtime-capabilities.service.spec.ts
@@ -77,6 +77,8 @@ describe('RuntimeCapabilitiesService', () => {
             dbDeleteXtreamContent: jest.fn(),
             dbRestoreXtreamUserData: jest.fn(),
             downloadsGetList: jest.fn(),
+            openInMpv: jest.fn(),
+            openInVlc: jest.fn(),
             prepareEmbeddedMpv: jest.fn(),
             saveFileDialog: jest.fn(),
             writeFile: jest.fn(),
@@ -119,6 +121,7 @@ describe('RuntimeCapabilitiesService', () => {
         expect(service.supportsXtreamSqliteDataSource).toBe(false);
         expect(service.supportsDownloads).toBe(false);
         expect(service.supportsPortalActivityStorage).toBe(false);
+        expect(service.supportsManagedExternalPlayers).toBe(false);
         expect(service.supportsEmbeddedMpv).toBe(false);
         expect(service.supportsDesktopFileSave).toBe(false);
         expect(service.supportsRemoteControl).toBe(false);
@@ -150,4 +153,22 @@ describe('RuntimeCapabilitiesService', () => {
         expect(service.supportsSqlite).toBe(true);
         expect(service.supportsXtreamSqliteDataSource).toBe(false);
     });
+
+    it('requires both managed external player launch methods', () => {
+        testWindow.electron = {
+            openInMpv: jest.fn(),
+        };
+
+        const service = new RuntimeCapabilitiesService();
+
+        expect(service.isElectron).toBe(true);
+        expect(service.supportsManagedExternalPlayers).toBe(false);
+
+        testWindow.electron = {
+            openInMpv: jest.fn(),
+            openInVlc: jest.fn(),
+        };
+
+        expect(service.supportsManagedExternalPlayers).toBe(true);
+    });
 });
diff --git a/libs/services/src/lib/runtime-capabilities.service.ts b/libs/services/src/lib/runtime-capabilities.service.ts
index 80d12546d..84b6bff5d 100644
--- a/libs/services/src/lib/runtime-capabilities.service.ts
+++ b/libs/services/src/lib/runtime-capabilities.service.ts
@@ -106,7 +106,9 @@ export class RuntimeCapabilitiesService {
     }
 
     get supportsManagedExternalPlayers(): boolean {
-        return this.isElectron;
+        return ['openInMpv', 'openInVlc'].every((methodName) =>
+            this.hasElectronMethod(methodName)
+        );
     }
 
     get supportsEmbeddedMpv(): boolean {