Boltai

[Kinkazma]

Configuration in boltai.config.json:
"calculator": {
"command": "npx",
"args": [
"-y",
"@wrtnlabs/calculator-mcp@latest"
]
}

Integration of the Calculator MCP
I first tried several approaches with Python (pip, local module, python -m mcp_server_calculator) and uvx mcp-server-calculator — without success, the server did not respond to requests.
I then switched to a Node/NPX solution.

What worked:
• I ran npx -y @wrtnlabs/calculator-mcp@latest
• The server starts listening on stdin/stdout and correctly responds to JSON requests

npx -y @wrtnlabs/calculator-mcp@latest

This server is running on stdio

echo '{"tool":"calculate","args":{"expression":"6*7"}}' \ | npx -y @wrtnlabs/calculator-mcp@latest

This server is running on stdio

I am quite disappointed, I sincerely thought it would give me the answer in the terminal. At first, I believed it wouldn’t work in my Boltai application, but in the end, it does say "Running."

[githejie]

Hi @Kinkazma
The current project is a python project, and the node version wrtnlabs/calculator-mcp you showed is not related to the current project.
From your description, you tried to configure uvx and pip, but both failed. I guess you might be in a windows environment? After all, the configuration scheme for the unix-like environment introduced in my REDME document may be a little different for windows.
If your current environment is easier to run node programs, you can take a look at this https://smithery.ai/server/@githejie/mcp-server-calculator
In addition, I see that you try to enter the tool call parameters directly into the mcp program, which does not work because there is an initialization process before the mcp server and client are called.

[githejie]

Hi @Kinkazma
This should be a problem with the MCP client (Boltai).
I ran the mcp-server-calculator in command line mode and it worked fine.

Below is the example terminal input text I pasted so you can try it out.

{"id":0,"method":"initialize","params":{"clientInfo":{"name":"test","version":"0.0.1"},"capabilities":{},"protocolVersion":"2024-11-05"},"jsonrpc":"2.0"}
{"method":"notifications/initialized","jsonrpc":"2.0"}
{"id":1,"method":"tools/list","params":{},"jsonrpc":"2.0"}
{"id":2,"method":"tools/call","params":{"name":"calculate","_meta":{"progressToken":0},"arguments":{"expression":"1+1"}},"jsonrpc":"2.0"}