MCP error -32000: Connection closed

[owenzhao]

Describe the bug

I want to use a MCP server from here. https://github.com/MightyDillah/apple-doc-mcp

The official config is

{
  "mcpServers": {
    "apple-doc-mcp": {
      "command": "node",
      "args": ["/path/to/apple-doc-mcp/dist/index.js"]
    }
  }
}

I revised it in to

{
  "servers": {
    "apple-doc-mcp": {
      "command": "node",
      "args": ["/Volumes/2.05TB/System/zhaoxin/apple-doc-mcp/dist/index.js"]
    }
  }
}

As Copilot requests the "servers" as the keyword.

But I can't use the MCP server in Copilot as it shows an error "MCP error - 32000: Connection closed. I file this as a bug as the same setting works in another app.

Any idea?

Versions

• Copilot for Xcode: 0.38.0
• Xcode: 16.4 (16F6)
• macOS: 15.6 Beta(24G5065c)

Steps to reproduce

Screenshots

Logs

Additional context

[rollr76518]

Same issue here.

Additional info:

1. VSCode with the apple-doc-mcp can work perfect.
2. XcodeBuildMCP with mise can work in CopilotForXcode perfect.

[2025-07-20T10:05:16.091Z] [info] [GitHubCopilot] [31060] window/logMessage: {
  "message" : "[CopilotMCP] MCP server apple-doc-mcp connection closed.",
  "type" : 3
}
[2025-07-20T10:05:16.091Z] [info] [GitHubCopilot] [31060] window/logMessage: {
  "message" : "[CopilotMCP] Connection failed: McpError: MCP error -32000: Connection closed\n    at OY._onclose (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/shared\/protocol.ts:312:19)\n    at YY.onclose (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/shared\/protocol.ts:283:12)\n    at ChildProcess.<anonymous> (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/client\/stdio.ts:150:21)\n    at ChildProcess.emit (node:events:518:28)\n    at maybeClose (node:internal\/child_process:1104:16)\n    at Process.ChildProcess._handle.onexit (node:internal\/child_process:304:5) {\n  code: -32000,\n  data: undefined\n}",
  "type" : 1
}
[2025-07-20T10:05:16.091Z] [info] [GitHubCopilot] [31060] window/logMessage: {
  "message" : "[CopilotMCP] Error initializing MCP server apple-doc-mcp: McpError: MCP error -32000: Connection closed\n    at OY._onclose (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/shared\/protocol.ts:312:19)\n    at YY.onclose (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/shared\/protocol.ts:283:12)\n    at ChildProcess.<anonymous> (\/snapshot\/copilot-client\/node_modules\/@modelcontextprotocol\/sdk\/src\/client\/stdio.ts:150:21)\n    at ChildProcess.emit (node:events:518:28)\n    at maybeClose (node:internal\/child_process:1104:16)\n    at Process.ChildProcess._handle.onexit (node:internal\/child_process:304:5) {\n  code: -32000,\n  data: undefined\n}",
  "type" : 1
}
[2025-07-20T10:05:16.092Z] [info] [GitHubCopilot] [31060] window/showMessageRequest: {
  "message" : "Failed to initialize MCP server 'apple-doc-mcp'. Please check the logs for more details.",
  "actions" : [

  ],
  "type" : 2
}
[2025-07-20T10:05:16.149Z] [info] [Client] [31060] Notify about MCP tools change: Server: apple-doc-mcp with 0 tools (0 enabled, 0 disabled). Server: XcodeBuildMCP with 80 tools (80 enabled, 0 disabled). 
...
[2025-07-20T10:05:23.223Z] [info] [UI] [31060] GitHub Copilot for Xcode settings script error: {
    NSAppleScriptErrorAppName = "System Events";
    NSAppleScriptErrorBriefMessage = "Not authorized to send Apple events to System Events.";
    NSAppleScriptErrorMessage = "Not authorized to send Apple events to System Events.";
    NSAppleScriptErrorNumber = "-1743";
    NSAppleScriptErrorRange = "NSRange: {92, 43}";
}

[testforstephen]

We just released a new version 0.39.0, and I tried the mcp server apple-doc-mcp and it works fine. Could you try again? @owenzhao and @rollr76518

[owenzhao]

Still the same. Can you share your mcp.json?

[rollr76518]

Version 0.40.0 (0.40.0) works at my mac.

my mcp.json

{
    "servers": {
        "XcodeBuildMCP": {
            "command": "mise",
            "args": [
                "x",
                "npm:xcodebuildmcp@1.10.4",
                "--",
                "xcodebuildmcp"
            ]
        },
        "apple-doc-mcp": {
            "command": "node",
            "args": [
                "/Users/ryan/apple-doc-mcp/dist/index.js"
            ]
        }
    }
}

Thanks a lot.

[owenzhao]

Thanks @rollr76518 ， after seeing your reply I double checked my config and found I some parts of the config is wrong.

Now everything works fine.