mcp weather claude desktio json parsing issue
# helpm
moj1296
08/25/2025, 1:52 PMhey there, I'm trying to run the weather mcp server https://github.com/BoundaryML/baml-examples/tree/main/python-mcp-server on my claude desktop. The tool return the correct result but I get alot of warning from claude (see screenshot). I use 4o-mini as my model. It only happens when I use the alter tool not the forcast tool. I use python 3.11 and the baml 0.205. Any idea what could cause the issue
here is the part of the log :
Copy code
2025-08-25T13:42:55.809Z [weather] [error] Unexpected token '☀', " ☀️ **Sizzl"... is not valid JSON {
metadata: {
context: 'connection',
stack: `SyntaxError: Unexpected token '☀', " ☀️ **Sizzl"... is not valid JSON\n` +
' at JSON.parse (<anonymous>)\n' +
' at Iwe (C:\\Users\\[USERNAME]\\AppData\\Local\\[APP]\\app-
}
2025-08-25T13:42:55.809Z [weather] [error] Unexpected end of JSON input {
metadata: {
context: 'connection',
stack: 'SyntaxError: Unexpected end of JSON input\n' +
' at JSON.parse (<anonymous>)\n' +
' at Iwe (C:\\Users\\[USERNAME]\\AppData\\Local\\[APP]\\app-[VERSION]\\resources\\app.asar\\.vite\\build\\index.js:214:207)\n' +
' at Nwe.readMessage (C:\\Users\\[USERNAME]\\AppData\\Local\\[APP]\\app-[VERSION]\\resources\\app.asar\\.vite\\build\\index.js:214:133)\n' +
' at bwe.processReadBuffer (C:\\Users\\[USERNAME]\\AppData\\Local\\[APP]\\app-[VERSION]\\resources\\app.asar\\.vite\\build\\index.js:215:2203)\n' +
' at Socket.<anonymous> (C:\\Users\\[USERNAME]\\AppData\\Local\\
}
2025-08-25T13:42:55.809Z [weather] [error] Unexpected token ' ', " �� **Light"... is not valid JSON {
metadata: {
context: 'connection',
stack: `SyntaxError: Unexpected token '\ud83d', " �� **Light"... is not valid JSON\n` +
' at JSON.parse (<anonymous>)\n' +
' at Readable.push (node:internal/streams/readable:392:12)\n' +
' at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)'
}
}
}