allow using host computer for mcp server with documentation

libs/python/computer-server/computer_server/handlers/macos.py

@@ -1287,7 +1287,15 @@ class MacOSAutomationHandler(BaseAutomationHandler):
             if not isinstance(screenshot, Image.Image):
                 return {"success": False, "error": "Failed to capture screenshot"}
 
+            # Resize image to reduce size (max width 1920, maintain aspect ratio)
+            max_width = 1920
+            if screenshot.width > max_width:
+                ratio = max_width / screenshot.width
+                new_height = int(screenshot.height * ratio)
+                screenshot = screenshot.resize((max_width, new_height), Image.Resampling.LANCZOS)
+
             buffered = BytesIO()
+            # Use PNG format with optimization to reduce file size
             screenshot.save(buffered, format="PNG", optimize=True)
             buffered.seek(0)
             image_data = base64.b64encode(buffered.getvalue()).decode()

libs/python/mcp-server/mcp_server/session_manager.py

@@ -10,6 +10,7 @@ This module provides:
 
 import asyncio
 import logging
+import os
 import time
 import uuid
 import weakref
@@ -57,7 +58,14 @@ class ComputerPool:
                 logger.debug("Creating new computer instance")
                 from computer import Computer
 
-                computer = Computer(verbosity=logging.INFO)
+                # Check if we should use host computer server
+                use_host = os.getenv("CUA_USE_HOST_COMPUTER_SERVER", "false").lower() in (
+                    "true",
+                    "1",
+                    "yes",
+                )
+
+                computer = Computer(verbosity=logging.INFO, use_host_computer_server=use_host)
                 await computer.run()
                 self._in_use.add(computer)
                 return computer