Debugging with only usb connected possible?

is it possible to debug the firmware of an argon with only usb connected?
or is it required to have something like https://store.particle.io/products/particle-debugger ?

Rudimentary debugging is possible with consciously placed Serial.print() or Log statements in your code and observation via a USB Serial connection.

If you want in-circuit-debugging you will need a JTAG/SWD connection and some dedicated debugging hardware.

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