examples/hello-world-node installs but does not function on Claude desktop

[marklemay]

Describe the bug
package then install.

"Unable to connect to extension server. Please try disabling and re-enabling the extension."
""MCP Hello World MCP Server (Reference Extension): Server disconnected. For troubleshooting guidance, please visit our debugging documentation"

To Reproduce

mcpb pack examples/hello-world-node
claude.exe F:\mcpb\hello-world-node.mcpb

install

Expected behavior
the sample application is installed and works

Logs

2026-03-10T15:08:29.362Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:08:29.420Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:08:33.350Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:08:33.351Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:33.352Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed (intentional shutdown) { metadata: undefined }
2026-03-10T15:08:33.352Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:33.350Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:08:33.360Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:08:33.360Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:33.361Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:08:33.379Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:08:34.041Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:08:34.042Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:08:34.374Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:08:34.374Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:34.375Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:08:34.375Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:08:34.376Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:40.265Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:40.265Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:08:40.266Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:08:40.286Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:08:40.962Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:08:40.972Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:08:41.282Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:08:41.283Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:08:41.283Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:08:41.283Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:08:41.283Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:16:58.992Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:16:58.992Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:18:27.088Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:18:27.108Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:18:27.782Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:18:27.783Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:18:28.119Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:18:28.120Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:18:28.120Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:18:28.120Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:18:28.120Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:24.574Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:24.574Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:19:25.469Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:19:25.494Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:19:26.160Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:19:26.161Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:19:26.507Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:19:26.507Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:26.507Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:19:26.507Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:19:26.507Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:48.213Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:48.213Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:19:48.821Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:19:48.842Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:19:49.503Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:19:49.504Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:19:49.827Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:19:49.827Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:19:49.827Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:19:49.827Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:19:49.827Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:20:23.205Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:20:23.205Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }
2026-03-10T15:20:23.205Z [Hello World MCP Server (Reference Extension)] [info] Initializing server... { metadata: undefined }
2026-03-10T15:20:23.225Z [Hello World MCP Server (Reference Extension)] [info] Using built-in Node.js for MCP server: Hello World MCP Server (Reference Extension) { metadata: undefined }
2026-03-10T15:20:23.876Z [Hello World MCP Server (Reference Extension)] [info] Server started and connected successfully { metadata: undefined }
2026-03-10T15:20:24.031Z [Hello World MCP Server (Reference Extension)] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{"extensions":{"io.modelcontextprotocol/ui":{"mimeTypes":["text/html;profile=mcp-app"]}}},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} { metadata: undefined }
2026-03-10T15:20:24.220Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed { metadata: undefined }
2026-03-10T15:20:24.220Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:20:24.221Z [Hello World MCP Server (Reference Extension)] [info] Server transport closed unexpectedly, this is likely due to the process exiting early. If you are developing this MCP server you can add output to stderr (i.e. `console.error('...')` in JavaScript, `print('...', file=sys.stderr)` in python) and it will appear in this log. { metadata: undefined }
2026-03-10T15:20:24.221Z [Hello World MCP Server (Reference Extension)] [error] Server disconnected. For troubleshooting guidance, please visit our [debugging documentation](https://modelcontextprotocol.io/docs/tools/debugging) { metadata: { context: 'connection', stack: undefined } }
2026-03-10T15:20:24.221Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:20:26.085Z [Hello World MCP Server (Reference Extension)] [info] Client transport closed { metadata: undefined }
2026-03-10T15:20:26.085Z [Hello World MCP Server (Reference Extension)] [info] Shutting down server... { metadata: undefined }

Additional context
Claude 1.1.5368 (d12d02) 2026-03-05T17:29:33.000Z