v5x doctor
Checks the local environment before project code or hardware-specific commands are involved. It reports Bun version, CLI platform support, project toolchains, and visible serial ports when the operating system allows them to be listed. The command does not require a connected V5 brain. If no serial ports are visible, hardware commands may still work after connecting and powering on a brain.

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JSON output

v5x doctor --json
The JSON output includes an overall status and each check’s status, value, and suggested next action: 
{
  "status": "warn",
  "checks": [
    {
      "name": "Serial ports",
      "status": "ok",
      "value": "none visible",
      "action": "Connect a powered V5 brain only when running hardware commands."
    }
  ]
}