mcp(fix[pane_tools]): Replace deprecated resize_pane with state-aware zoom

why: pane.resize_pane() always raises DeprecatedError since libtmux
v0.28, making the resize_pane MCP tool 100% broken.
what:
- Replace pane.resize_pane() with pane.resize() for height/width
- Add state-aware zoom: check window_zoomed_flag before toggling
- Add mutual exclusivity check for zoom + height/width
- Add tests for dimensions, zoom, and mutual exclusivity

Author: tony

src/libtmux/mcp/tools/pane_tools.py

@@ -145,19 +145,28 @@ def resize_pane(
     str
         JSON of the updated pane.
     """
+    from fastmcp.exceptions import ToolError
+
+    if zoom is not None and (height is not None or width is not None):
+        msg = "Cannot combine zoom with height/width"
+        raise ToolError(msg)
+
     server = _get_server(socket_name=socket_name)
     pane = _resolve_pane(
         server,
         pane_id=pane_id,
         session_name=session_name,
         window_id=window_id,
     )
-    if zoom is True:
-        pane.resize_pane(zoom=True)
-    elif zoom is False:
-        pane.resize_pane(zoom=False)
+    if zoom is not None:
+        window = pane.window
+        is_zoomed = getattr(window, "window_zoomed_flag", "0") == "1"
+        if zoom and not is_zoomed:
+            pane.resize(zoom=True)
+        elif not zoom and is_zoomed:
+            pane.resize(zoom=True)  # toggle off
     else:
-        pane.resize_pane(height=height, width=width)
+        pane.resize(height=height, width=width)
     return json.dumps(_serialize_pane(pane))
 
 

tests/mcp/test_pane_tools.py

@@ -5,11 +5,15 @@
 import json
 import typing as t
 
+import pytest
+from fastmcp.exceptions import ToolError
+
 from libtmux.mcp.tools.pane_tools import (
     capture_pane,
     clear_pane,
     get_pane_info,
     kill_pane,
+    resize_pane,
     send_keys,
     set_pane_title,
 )
@@ -71,6 +75,46 @@ def test_clear_pane(mcp_server: Server, mcp_pane: Pane) -> None:
     assert "cleared" in result.lower()
 
 
+def test_resize_pane_dimensions(mcp_server: Server, mcp_pane: Pane) -> None:
+    """resize_pane resizes a pane with height/width."""
+    result = resize_pane(
+        pane_id=mcp_pane.pane_id,
+        height=10,
+        width=40,
+        socket_name=mcp_server.socket_name,
+    )
+    data = json.loads(result)
+    assert data["pane_id"] == mcp_pane.pane_id
+
+
+def test_resize_pane_zoom(mcp_server: Server, mcp_session: Session) -> None:
+    """resize_pane zooms a pane."""
+    window = mcp_session.active_window
+    window.split()
+    pane = window.active_pane
+    assert pane is not None
+    result = resize_pane(
+        pane_id=pane.pane_id,
+        zoom=True,
+        socket_name=mcp_server.socket_name,
+    )
+    data = json.loads(result)
+    assert data["pane_id"] == pane.pane_id
+
+
+def test_resize_pane_zoom_mutual_exclusivity(
+    mcp_server: Server, mcp_pane: Pane
+) -> None:
+    """resize_pane raises ToolError when zoom combined with dimensions."""
+    with pytest.raises(ToolError, match="Cannot combine zoom"):
+        resize_pane(
+            pane_id=mcp_pane.pane_id,
+            zoom=True,
+            height=10,
+            socket_name=mcp_server.socket_name,
+        )
+
+
 def test_kill_pane(mcp_server: Server, mcp_session: Session) -> None:
     """kill_pane kills a pane."""
     window = mcp_session.active_window