cursor can't use there tools

[eatmelonhan]

{
"mcpServers": {
"unitymcp": {
"type": "stdio",
"command": "node",
"args": ["/UnityMCP-main/unity-mcp-server/build/index.js"]
}
}
}

cursor can read tools but "No resources available" .
i opend the debug window in unity and it said connection successful
but ai said “ "error": "MCP error -32603: MCP error -32603: Unity Editor is not connected. Please ensure the Unity Editor is running and the UnityMCP window is open."
”

[eatmelonhan]

how to use it ?thanks!

[liutiangang]

"unity-mcp-local": {
"command": "cmd",
"args": [
"/c",
"node",
"D:\WorkSpace\GitHub\UnityMCP\unity-mcp-server\build\index.js",
"--config",
""{}""
]
}
cursor 0.47.7 It should be set like this

[Arodoid]

{ "mcpServers": { "unitymcp": { "type": "stdio", "command": "node", "args": ["/UnityMCP-main/unity-mcp-server/build/index.js"] } } }

cursor can read tools but "No resources available" . i opend the debug window in unity and it said connection successful but ai said “ "error": "MCP error -32603: MCP error -32603: Unity Editor is not connected. Please ensure the Unity Editor is running and the UnityMCP window is open." ”

This means Cursor can't establish a connection with the Unity Editor. Here's how to fix it:

1. First, ensure Unity is set up correctly:

   • Open your Unity project
   • Open the UnityMCP Debug Window (Window > UnityMCP > Debug Window)
   • Wait until you see "Connection successful" in the debug window

2. Then, configure Cursor correctly:
   Add this to your Cursor settings.json:

   {
     "mcpServers": {
       "unity-mcp-local": {
         "command": "cmd",
         "args": [
           "/c",
           "node",
           "PATH_TO_YOUR_SERVER/index.js",
           "--config",
           "{}"
         ]
       }
     }
   }

   Replace PATH_TO_YOUR_SERVER with the actual path to your unity-mcp-server's build/index.js file.

3. Important notes:

   • Make sure Unity is running and the UnityMCP window is open BEFORE starting Cursor
   • The path to the server must be absolute (full path)
   • The --config "{}" part is important - don't skip it
   • This configuration is specifically for Cursor 0.47.7

4. Example with actual path:

   {
     "mcpServers": {
       "unity-mcp-local": {
         "command": "cmd",
         "args": [
           "/c",
           "node",
           "D:\\WorkSpace\\GitHub\\UnityMCP\\unity-mcp-server\\build\\index.js",
           "--config",
           "{}"
         ]
       }
     }
   }

5. Troubleshooting:

   • If you still get the connection error, try:
     1. Close both Unity and Cursor
     2. Open Unity first and wait for the UnityMCP window to show "Connected"
     3. Then open Cursor
   • Make sure the WebSocket port (8080) isn't blocked by your firewall
   • Check that the path to the server is correct and accessible

Let me know if you still have issues after trying these steps!

[yayapipi]

2. settings.json

I tried everything but still happen same error, any idea? 0.0

[Arodoid]

I see the issue - looking at your screenshot, there's a mismatch between what Unity thinks (connected) and what the MCP server thinks (not connected).

Try these specific fixes:

1. First, check your Cursor settings.json:

   {
     "mcpServers": {
       "unity-mcp-local": {
         "command": "cmd",
         "args": [
           "/c",
           "node",
           "C:/FULL/PATH/TO/UnityMCP/unity-mcp-server/build/index.js",
           "--config",
           "{}"
         ],
         "type": "stdio"
       }
     }
   }

   • Make sure you use your actual full path
   • Don't forget the type: "stdio" part
   • Use forward slashes in the path

2. Restart everything in this exact order:

   1. Close Cursor completely
   2. Close Unity completely
   3. Start Unity and open your project
   4. Open UnityMCP Debug Window (Window > UnityMCP > Debug Window)
   5. Wait for "Connected" to appear
   6. Then start Cursor

3. Additional troubleshooting:

   • Check if you have any antivirus/firewall blocking WebSocket connections
   • Try running both Unity and Cursor as Administrator
   • Make sure you're using node.js 18.x or later to run the server
   • Check you have the latest version of the Unity plugin

4. If all else fails:
   Add this to your Cursor settings.json:

   {
     "debug": {
       "mcp": true
     }
   }

   Then restart Cursor and look for error messages in the console.

Let me know if this helps!

[liutiangang]

"UnityMCP-node": {
      "command": "node",
      "args": [
        "D:/Work/Github/UnityMCP/unity-mcp-server/build/index.js"
      ],
      "env": {
        "UNITY_PORT": "8080"
      }
    }