diff --git a/src/tracker/init_db.py b/src/tracker/init_db.py
index 1acd22e..7f0654e 100644
--- a/src/tracker/init_db.py
+++ b/src/tracker/init_db.py
@@ -36,6 +36,18 @@ async def init_db():
         )
         session.add(admin)
 
+        # Create BFF service member with TRACKER_TOKEN
+        bff_service = Member(
+            name="BFF Service",
+            slug="bff",
+            type="bridge",
+            role="bridge",
+            auth_method="token",
+            token="tb-tracker-dev-token",
+            status="offline",
+        )
+        session.add(bff_service)
+
         # Create lobby chat
         lobby = Chat(
             kind="lobby",
@@ -44,7 +56,7 @@ async def init_db():
         session.add(lobby)
 
         await session.commit()
-        logger.info("Seed data created: admin user + lobby chat (id=%s)", lobby.id)
+        logger.info("Seed data created: admin user, BFF service, lobby chat (id=%s)", lobby.id)
 
 
 if __name__ == "__main__":
diff --git a/src/tracker/ws/handler.py b/src/tracker/ws/handler.py
index 2e8e388..07aa893 100644
--- a/src/tracker/ws/handler.py
+++ b/src/tracker/ws/handler.py
@@ -29,7 +29,8 @@ async def websocket_endpoint(ws: WebSocket):
             return
 
         token = auth_msg.get("token", "")
-        slug = await _authenticate(ws, token)
+        on_behalf_of = auth_msg.get("on_behalf_of")
+        slug = await _authenticate(ws, token, on_behalf_of=on_behalf_of)
         if not slug:
             return
 
@@ -77,8 +78,12 @@ async def websocket_endpoint(ws: WebSocket):
             )
 
 
-async def _authenticate(ws: WebSocket, token: str) -> str | None:
-    """Authenticate by token, return slug or None."""
+async def _authenticate(ws: WebSocket, token: str, on_behalf_of: str | None = None) -> str | None:
+    """Authenticate by token, return slug or None.
+    
+    If on_behalf_of is set and the token belongs to a bridge member,
+    use on_behalf_of slug instead (BFF proxying for web users).
+    """
     async with async_session() as db:
         result = await db.execute(
             select(Member).where(Member.token == token).options(selectinload(Member.agent_config))
@@ -103,6 +108,26 @@ async def _authenticate(ws: WebSocket, token: str) -> str | None:
             await ws.close()
             return None
 
+        # BFF proxy: bridge member can act on behalf of a user
+        effective_slug = member.slug
+        effective_type = member.type
+        if on_behalf_of and member.type == "bridge":
+            # Look up the actual user
+            user_result = await db.execute(
+                select(Member).where(Member.slug == on_behalf_of)
+                .options(selectinload(Member.agent_config))
+            )
+            user_member = user_result.scalar_one_or_none()
+            if user_member:
+                effective_slug = user_member.slug
+                effective_type = user_member.type
+                member = user_member  # use user's settings
+                logger.info("Bridge %s acting on behalf of %s", member.slug, effective_slug)
+            else:
+                # User not found, use a synthetic slug to avoid collisions
+                effective_slug = on_behalf_of
+                logger.info("Bridge acting on behalf of unknown user %s", effective_slug)
+
         # Get listen modes
         chat_listen = "all"
         task_listen = "all"
@@ -113,8 +138,8 @@ async def _authenticate(ws: WebSocket, token: str) -> str | None:
         # Register connection
         client = ConnectedClient(
             ws=ws,
-            member_slug=member.slug,
-            member_type=member.type,
+            member_slug=effective_slug,
+            member_type=effective_type,
             chat_listen=chat_listen,
             task_listen=task_listen,
         )
@@ -148,7 +173,7 @@ async def _authenticate(ws: WebSocket, token: str) -> str | None:
         await ws.send_json({
             "type": "auth.ok",
             "data": {
-                "slug": member.slug,
+                "slug": effective_slug,
                 "lobby_chat_id": str(lobby_chat.id) if lobby_chat else None,
                 "projects": project_list,
                 "online": online,
diff --git a/src/tracker/ws/manager.py b/src/tracker/ws/manager.py
index 734fd26..d87f5cc 100644
--- a/src/tracker/ws/manager.py
+++ b/src/tracker/ws/manager.py
@@ -44,6 +44,9 @@ class ConnectionManager:
 
     async def broadcast_message(self, project_id: str, message: dict, author_slug: str):
         """Broadcast message.new — filtered by chat_listen."""
+        logger.info("broadcast_message: project=%s, author=%s, clients=%s", project_id, author_slug, list(self.clients.keys()))
+        for slug, client in list(self.clients.items()):
+            logger.info("  checking %s: subscribed=%s, chat_listen=%s", slug, client.subscribed_projects, client.chat_listen)
         mentions = message.get("mentions", [])
         for slug, client in list(self.clients.items()):
             if slug == author_slug: