Did you even read my post?
NPX is a wrapper to start node under C:\Program Files\nodejs\npx.cmd
This is a batch script which needs an interpreter (cmd.exe) to start.
Start the *.js without the wrapper directly via node
example:
node c:\Users\<your_yourser
>\AppData\Roaming\npm\node_modules\@agentdeskai\browser-tools-mcp\dist\mcp-server.js
“No number after minus sign in JSON at position.” is an error from the mcp-server, syntax or parsing error