diff --git a/client/__init__.py b/client/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/client/main.py b/client/main.py
new file mode 100644
index 0000000..f332efc
--- /dev/null
+++ b/client/main.py
@@ -0,0 +1,9 @@
+"""Smart Assistant client entry point. Implemented in Plan 3."""
+
+
+def main() -> None:
+    raise SystemExit("client.main: placeholder; full implementation comes in Plan 3.")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/client/pair.py b/client/pair.py
new file mode 100644
index 0000000..91b78e3
--- /dev/null
+++ b/client/pair.py
@@ -0,0 +1,9 @@
+"""Smart Assistant pairing CLI. Implemented in Plan 3."""
+
+
+def main() -> None:
+    raise SystemExit("client.pair: placeholder; full implementation comes in Plan 3.")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/requirements-nodeps.txt b/requirements-nodeps.txt
new file mode 100644
index 0000000..7e39f69
--- /dev/null
+++ b/requirements-nodeps.txt
@@ -0,0 +1 @@
+openwakeword==0.6.0
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..facf382
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,8 @@
+sounddevice==0.5.1
+numpy>=2.0
+scipy>=1.13
+onnxruntime>=1.18
+scikit-learn
+tqdm
+requests
+websockets>=12.0