Try adding space before Pane.send_keys commands so shell doesn't record a command in history.

Author: tony

tmuxp/pane.py

@@ -81,7 +81,7 @@ def send_keys(self, cmd, enter=True):
         :type enter: bool
 
         """
-        self.tmux('send-keys', cmd)
+        self.tmux('send-keys', ' ' + cmd)
 
         if enter:
             self.enter()