diff --git a/.mise/tasks/add b/.mise/tasks/add
index 0860608..18540e0 100755
--- a/.mise/tasks/add
+++ b/.mise/tasks/add
@@ -71,7 +71,7 @@ pin="$(git -C "$mod_path" rev-parse HEAD)"
 
 manifest_set "$name" "$url" "$pin" "$track_ref"
 
-git -C "$TARGET_DIR" add "$MANIFEST"
+git -C "$TARGET_DIR" -c advice.addEmbeddedRepo=false add "$MANIFEST"
 
 if [ -n "$track_ref" ]; then
   gum style --foreground 2 "Added module '$name' ($clones_rel/$name @ ${pin:0:12}, tracking $track_ref)"
diff --git a/test/add.bats b/test/add.bats
index 54f21cb..1a297ba 100644
--- a/test/add.bats
+++ b/test/add.bats
@@ -28,6 +28,13 @@ setup() {
   # Readable directory should exist with repo contents
   [ -d "$PARENT/modules/remote/.git" ]
   [ -f "$PARENT/modules/remote/README.md" ]
+
+  # No embedded-repo warning (regression guard for #14).
+  # The original warning was caused by directory git add in the old
+  # hash-based subdirectory layout (pre-opacity redesign). That code
+  # path is gone, but this guard + -c flag in add task together
+  # prevent accidental reintroduction.
+  [[ "$output" != *"embedded git repository"* ]]
 }
 
 @test "add records entry in manifest" {