1 files changed, 21 insertions, 3 deletions
diff --git a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
index 54f1541..a0776d2 100644
--- a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
+++ b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
@@ -897,9 +897,7 @@ class WebRTCPeerSession:
             # safe for the reason those were not: it is *derived* from this list
             # on every build rather than stored beside it, so the two cannot
             # drift apart.
-            **{f"{app}_directories":
-               list(self._group_ctx().get(f"{app}_directories") or [])
-               for app in ("video", "music", "photo", "chat")},
+            **self._app_directories_ack(),
             # Where chat attachments are written — the singular form, because
             # Chat genuinely has one destination. "" means the operator has not
             # chosen, and the paperclip says so.
@@ -3182,6 +3180,26 @@ class WebRTCPeerSession:
         task.add_done_callback(_on_done)
         return task
 
+    def _app_directories_ack(self) -> dict:
+        """
+        Every application's configured folders, for the handshake ack.
+
+        Read off the group context rather than from a list of applications kept
+        here, so this cannot name an application the node knows nothing else
+        about — and cannot fail to name one the daemon does. A copy of the
+        daemon's `APP_DIR_KEYS` lived here until 2026-09-10 and had already lost
+        an entry, which made the app that entry belonged to the single one whose
+        directories never reached a client. This module names an application in
+        exactly one place, and it is `ALLOWED_APPS`.
+
+        `_app_directories_ctx` is the only thing that puts a `*_directories` key
+        in that context, and an absent one reads as none configured — never as
+        "the whole group index".
+        """
+        return {key: list(value or [])
+                for key, value in self._group_ctx().items()
+                if key.endswith("_directories")}
+
     def _group_ctx(self) -> dict:
         if "groups" in self._ctx and self._group_id:
             # `.get`, not a bare subscript. A config reload removes a group