diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..bf56e79
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,23 @@
+[build-system]
+requires = ["setuptools>=68.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "cursor-flasher"
+version = "0.1.0"
+description = "Flash Cursor's window when the AI agent is waiting for input"
+requires-python = ">=3.10"
+dependencies = [
+    "pyobjc-framework-Cocoa",
+    "pyobjc-framework-Quartz",
+    "PyYAML",
+]
+
+[project.optional-dependencies]
+dev = ["pytest", "pytest-mock"]
+
+[project.scripts]
+cursor-flasher = "cursor_flasher.cli:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..8290426
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+pyobjc-framework-Cocoa
+pyobjc-framework-Quartz
+PyYAML
+pytest
+pytest-mock
diff --git a/src/cursor_flasher.egg-info/PKG-INFO b/src/cursor_flasher.egg-info/PKG-INFO
new file mode 100644
index 0000000..3a4ccf9
--- /dev/null
+++ b/src/cursor_flasher.egg-info/PKG-INFO
@@ -0,0 +1,11 @@
+Metadata-Version: 2.4
+Name: cursor-flasher
+Version: 0.1.0
+Summary: Flash Cursor's window when the AI agent is waiting for input
+Requires-Python: >=3.10
+Requires-Dist: pyobjc-framework-Cocoa
+Requires-Dist: pyobjc-framework-Quartz
+Requires-Dist: PyYAML
+Provides-Extra: dev
+Requires-Dist: pytest; extra == "dev"
+Requires-Dist: pytest-mock; extra == "dev"
diff --git a/src/cursor_flasher.egg-info/SOURCES.txt b/src/cursor_flasher.egg-info/SOURCES.txt
new file mode 100644
index 0000000..4dd9e45
--- /dev/null
+++ b/src/cursor_flasher.egg-info/SOURCES.txt
@@ -0,0 +1,9 @@
+pyproject.toml
+src/cursor_flasher/__init__.py
+src/cursor_flasher/__main__.py
+src/cursor_flasher.egg-info/PKG-INFO
+src/cursor_flasher.egg-info/SOURCES.txt
+src/cursor_flasher.egg-info/dependency_links.txt
+src/cursor_flasher.egg-info/entry_points.txt
+src/cursor_flasher.egg-info/requires.txt
+src/cursor_flasher.egg-info/top_level.txt
\ No newline at end of file
diff --git a/src/cursor_flasher.egg-info/dependency_links.txt b/src/cursor_flasher.egg-info/dependency_links.txt
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/cursor_flasher.egg-info/dependency_links.txt
@@ -0,0 +1 @@
+
diff --git a/src/cursor_flasher.egg-info/entry_points.txt b/src/cursor_flasher.egg-info/entry_points.txt
new file mode 100644
index 0000000..55fb371
--- /dev/null
+++ b/src/cursor_flasher.egg-info/entry_points.txt
@@ -0,0 +1,2 @@
+[console_scripts]
+cursor-flasher = cursor_flasher.cli:main
diff --git a/src/cursor_flasher.egg-info/requires.txt b/src/cursor_flasher.egg-info/requires.txt
new file mode 100644
index 0000000..820db24
--- /dev/null
+++ b/src/cursor_flasher.egg-info/requires.txt
@@ -0,0 +1,7 @@
+pyobjc-framework-Cocoa
+pyobjc-framework-Quartz
+PyYAML
+
+[dev]
+pytest
+pytest-mock
diff --git a/src/cursor_flasher.egg-info/top_level.txt b/src/cursor_flasher.egg-info/top_level.txt
new file mode 100644
index 0000000..6510aed
--- /dev/null
+++ b/src/cursor_flasher.egg-info/top_level.txt
@@ -0,0 +1 @@
+cursor_flasher
diff --git a/src/cursor_flasher/__init__.py b/src/cursor_flasher/__init__.py
new file mode 100644
index 0000000..182e26a
--- /dev/null
+++ b/src/cursor_flasher/__init__.py
@@ -0,0 +1,3 @@
+"""Cursor Flasher — flash the Cursor window when the AI agent is waiting for input."""
+
+__version__ = "0.1.0"
diff --git a/src/cursor_flasher/__main__.py b/src/cursor_flasher/__main__.py
new file mode 100644
index 0000000..3a86860
--- /dev/null
+++ b/src/cursor_flasher/__main__.py
@@ -0,0 +1,4 @@
+from cursor_flasher.cli import main
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..8d9f898
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,4 @@
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.parent / "src"))