diff --git a/apps/api/src/services/terminal_session.py b/apps/api/src/services/terminal_session.py
index 034b86f..0557a8b 100644
--- a/apps/api/src/services/terminal_session.py
+++ b/apps/api/src/services/terminal_session.py
@@ -5,6 +5,7 @@ import logging
 import os
 import pty
 import select
+import signal
 import struct
 import fcntl
 import time
@@ -153,14 +154,18 @@ class TerminalSession:
         self._set_terminal_size(cols, rows)
         
         # Docker exec -it creates its own PTY inside the container,
-        # so host PTY resize doesn't propagate. We must send stty manually.
-        # To hide the command from the user:
-        # 1. \r moves cursor to start of current line (overwrites prompt)
-        # 2. stty command executes silently (no output on success)
-        # 3. \r moves cursor back to start, hiding the echoed command
-        stty_cmd = f"\rstty cols {cols} rows {rows}\r".encode()
-        await self.write_input(stty_cmd)
-        logger.debug(f"Sent stty resize to container for session {self.session_id}: {cols}x{rows}")
+        # so host PTY resize doesn't propagate to the container shell.
+        # Send SIGWINCH to the docker exec process on the host.
+        # Docker exec forwards signals to the container process, which should
+        # cause the container's shell to re-read its terminal size.
+        if self.process and self.process.pid:
+            try:
+                os.kill(self.process.pid, signal.SIGWINCH)
+                logger.debug(f"Sent SIGWINCH to docker exec process {self.process.pid} for session {self.session_id}")
+            except ProcessLookupError:
+                logger.warning(f"docker exec process {self.process.pid} not found for session {self.session_id}")
+            except Exception as e:
+                logger.warning(f"Failed to send SIGWINCH: {e}")
 
     async def reset(self) -> None:
         """Reset the session by killing the process and clearing state."""