diff --git a/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs b/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs
new file mode 100644
index 00000000..2cb5fd7f
--- /dev/null
+++ b/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs
@@ -0,0 +1,28 @@
+using System;
+using nadena.dev.build_framework;
+using nadena.dev.modular_avatar.editor.ErrorReporting;
+
+namespace nadena.dev.modular_avatar.core.editor
+{
+    internal class ModularAvatarContext : IExtensionContext
+    {
+        private IDisposable toDispose;
+        internal BuildContext BuildContext { get; private set; }
+
+        public void OnActivate(build_framework.BuildContext context)
+        {
+            if (BuildContext == null)
+            {
+                BuildContext = new BuildContext(context);
+            }
+
+            toDispose = BuildReport.CurrentReport.ReportingOnAvatar(context.AvatarDescriptor);
+        }
+
+        public void OnDeactivate(build_framework.BuildContext context)
+        {
+            toDispose?.Dispose();
+            toDispose = null;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs.meta b/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs.meta
new file mode 100644
index 00000000..fbe30f5b
--- /dev/null
+++ b/Packages/nadena.dev.modular-avatar/Editor/PluginDefinition/ModularAvatarContext.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 2be0ae3b99ac44c0a35522d7fd0c6f10
+timeCreated: 1692614275
\ No newline at end of file