That would be an interesting interaction to explore with a colourised terminal. Essential have contextual colouring on input so that mutually exclusive params are either shaded in the case of clear precedence or highlighted for conflict. It's not an area I've played with but wonder if that could be hacked into exisiting autocomplete mechanisms?
I was hinting/hoping at something beyond what fish does.
Rather than just structural colouring (params are colour a, valid paths colour b etc) the input is recoloured as you type in response to validity for the specific tool you're about to invoke.
