Support for python -m langgraph

libs/langgraph/langgraph/__main__.py

@@ -0,0 +1,30 @@
+try:
+    import sys
+
+    from langgraph_cli.cli import cli
+
+except ImportError:
+    # Provide more detailed error message with installation instructions
+    error_message = (
+        "\nError: langgraph_cli package not found.\n\n"
+        "This could be due to one of the following reasons:\n"
+        "1. You haven't installed the CLI package\n"
+        "2. Your virtual environment doesn't have the package installed\n"
+        "3. There's a path issue with your Python environment\n\n"
+        "To fix this, try one of the following solutions:\n"
+        "- Install the CLI package: pip install langgraph-cli\n"
+        "- If you're using a virtual environment, activate it first\n"
+        "- Use the standalone CLI directly by running: langgraph\n\n"
+        "For more help, visit: https://github.com/langchain-ai/langgraph/tree/main/libs/cli"
+    )
+    raise ImportError(error_message)
+
+try:
+    cli()
+except Exception as e:
+    # Catch any exceptions that might occur when running the CLI
+    print(f"\nError occurred while running langgraph CLI: {str(e)}")
+    print(
+        "If this problem persists, please report it at: https://github.com/langchain-ai/langgraph/issues"
+    )
+    sys.exit(1)