diff --git a/apps/api/src/services/terminal_session.py b/apps/api/src/services/terminal_session.py
index d4e504e..d91f8dd 100644
--- a/apps/api/src/services/terminal_session.py
+++ b/apps/api/src/services/terminal_session.py
@@ -146,6 +146,17 @@ class TerminalSession:
         self._rows = rows
         logger.info(f"resize() called for session {self.session_id}: {cols}x{rows}")
         self._set_terminal_size(cols, rows)
+        
+        # Docker exec doesn't forward PTY resize to the container process,
+        # so we need to explicitly set the size inside the container shell.
+        # Only do this on the first resize to avoid interfering with user input.
+        if not getattr(self, '_stty_sent', False):
+            self._stty_sent = True
+            # Clear any partial input and send stty command
+            # \x15 = Ctrl+U (clear line), \x0d = Enter
+            stty_cmd = f"\x15stty cols {cols} rows {rows}\x0d".encode()
+            await self.write_input(stty_cmd)
+            logger.info(f"Sent stty command to container for session {self.session_id}")
 
     async def reset(self) -> None:
         """Reset the session by killing the process and clearing state."""