diff --git a/app/Mcp/Tools/Post/AttachMediaFromUploadTool.php b/app/Mcp/Tools/Post/AttachMediaFromUploadTool.php
index 520c0eb7..dcebfe95 100644
--- a/app/Mcp/Tools/Post/AttachMediaFromUploadTool.php
+++ b/app/Mcp/Tools/Post/AttachMediaFromUploadTool.php
@@ -36,7 +36,7 @@ public function handle(Request $request): Response|ResponseFactory
 
         $media = Media::query()
             ->where('upload_token', data_get($validated, 'upload_token'))
-            ->where('mediable_type', Workspace::class)
+            ->where('mediable_type', (new Workspace)->getMorphClass())
             ->where('mediable_id', $workspaceId)
             ->first();
 
diff --git a/tests/Feature/Mcp/AttachMediaFromUploadToolTest.php b/tests/Feature/Mcp/AttachMediaFromUploadToolTest.php
index e4481145..fa3560ba 100644
--- a/tests/Feature/Mcp/AttachMediaFromUploadToolTest.php
+++ b/tests/Feature/Mcp/AttachMediaFromUploadToolTest.php
@@ -24,7 +24,7 @@
 
     $this->token = (string) Str::uuid();
     $this->media = Media::factory()->create([
-        'mediable_type' => Workspace::class,
+        'mediable_type' => (new Workspace)->getMorphClass(),
         'mediable_id' => $this->workspace->id,
         'collection' => 'assets',
         'upload_token' => $this->token,
@@ -48,7 +48,7 @@
 
     $foreignToken = (string) Str::uuid();
     Media::factory()->create([
-        'mediable_type' => Workspace::class,
+        'mediable_type' => (new Workspace)->getMorphClass(),
         'mediable_id' => $otherWs->id,
         'collection' => 'assets',
         'upload_token' => $foreignToken,