diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..4fbadd2
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+tldextract
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..da932e3
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,15 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    python312
+    python312Packages.tldextract
+    sing-box
+  ];
+
+  shellHook = ''
+    echo "Environment ready!"
+    echo "Python version: $(python --version)"
+    echo "sing-box version: $(sing-box version 2>/dev/null || echo 'not available')"
+  '';
+}