diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4975228
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "system/at"]
+	path = system/at
+	url = git@git.syui.ai:ai/at
diff --git a/system/at b/system/at
new file mode 160000
index 0000000..bd32991
--- /dev/null
+++ b/system/at
@@ -0,0 +1 @@
+Subproject commit bd3299154c46d6ead3fdf8b9a9d7d33305a447a9