diff --git a/software/script/chameleon_cli_main.py b/software/script/chameleon_cli_main.py
index beec2630..337ca142 100755
--- a/software/script/chameleon_cli_main.py
+++ b/software/script/chameleon_cli_main.py
@@ -94,6 +94,7 @@ def startCLI(self):
             raise Exception("This script requires at least Python 3.9")
 
         self.print_banner()
+        chameleon_cli_unit.check_tools()
         cmd_strs = []
         while True:
             if cmd_strs:
diff --git a/software/script/chameleon_cli_unit.py b/software/script/chameleon_cli_unit.py
index ec6b5b48..3c7f7956 100644
--- a/software/script/chameleon_cli_unit.py
+++ b/software/script/chameleon_cli_unit.py
@@ -37,12 +37,21 @@
                     0x38: "SmartMX with MIFARE Classic 4K",
                     }
 
-if getattr(sys, 'frozen', False):
+if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
     # in pyinstaller
-    default_cwd = str(Path(sys._MEIPASS) / "bin")
+    default_cwd = Path.cwd() / Path(sys._MEIPASS) / "bin"
 else:
     # from source
-    default_cwd = str(Path(__file__).parent.parent / "bin")
+    default_cwd = Path.cwd() / Path(__file__).parent.parent / "bin"
+
+
+def check_tools():
+    tools = ['staticnested', 'nested', 'darkside', 'mfkey32v2']
+    if sys.platform == "win32":
+        tools = [x+'.exe' for x in tools]
+    missing_tools = [tool for tool in tools if not (default_cwd / tool).exists()]
+    if len(missing_tools) > 0:
+        print(f'{CR}Warning, tools {", ".join(missing_tools)} not found. Corresponding commands will not work as intended.{C0}')
 
 
 class BaseCLIUnit: