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On Windows, when a bare-name MCP server command (e.g. codesys-mcp-sp21-plus) falls back to the .cmd candidate, the probe sets shell:true to work around Node 18.20+ CVE-2024-27980. However, passing an args array alongside shell:true causes Node to concatenate the tokens without quoting (DEP0190), so an arg containing a space (e.g. --codesys-path "C:\Program Files\...") is re-split by cmd.exe at every space boundary. The child process receives a truncated path, fails to launch, and the probe declares the server unavailable, falsely blocking every MCP tool call to that server. Fix: add a quoteWin() helper that double-quotes any token containing whitespace or cmd metacharacters. In the useShell branch, build a single properly-quoted command line string and pass it as the sole argument to spawn() with no separate args array. The else branch (shell:false, all non-.cmd commands) is unchanged. Regression test added: on Windows, creates a .cmd shim that echoes its first positional argument to stderr, probes it with a space-containing path arg, and asserts the probe succeeds and the arg was not split at the space boundary. Co-authored-by: Karstein Phobic Nyvold Kvistad <karstein.kvistad@maritimerobotics.com>