GeezerVison

I am not sure if we need curly braces here )

May be we should not ask specifying but suggest specifying the source code. Otherwise the user may think that it is mandatory for proper work of utility.

The --project-root is mandatory only when --sarif is set. In others cases it is not mandatory

Nit: "ration" seems misused here. Consider calling this property fuzzingRatio instead of fuzzingRation.

According to this comment from @tyuldashev, the default is 0.1 fuzzing, 0.9 symbolic. If we take the help text literally, then the default "ratio between symbolic engine and fuzzing" would be 0.9 ÷ 0.1 = 9. But from my understanding of the code, 9 is not a valid value here, and this argument should actually be 0.1 to mimic the default behavior.

Consider revising this option's name and help text to reflect its actual semantics and to document its default behavior. For example:

private val fuzzingFraction by option(
        "-z",
        "--fuzzing-fraction",
        help = "Specifies the fraction of time spent using fuzzing instead of the symbolic engine (default: $DEFAULT_FUZZING_VALUE)"
)
        .double()
        .default(DEFAULT_FUZZING_VALUE)
        .validate { require(it in 0.0 .. 1.0) { "should be between 0.0 and 1.0." } }

where DEFAULT_FUZZING_VALUE is the default value of org.utbot.framework.plugin.api.TestFlow.fuzzingValue: currently 0.1.