diff --git a/artdag_common/middleware/auth.py b/artdag_common/middleware/auth.py
index f9d97b1..6b4a22d 100644
--- a/artdag_common/middleware/auth.py
+++ b/artdag_common/middleware/auth.py
@@ -20,6 +20,7 @@ class UserContext:
     username: str
     actor_id: str  # Full actor ID like "@user@server.com"
     token: Optional[str] = None
+    l2_server: Optional[str] = None  # L2 server URL for this user
 
     @property
     def display_name(self) -> str: