Spells can't be hidden easily.
Verbal component for once always have to be pronounced aloud. Attempt to speak it quietly will simply cause spell failure.
Somatic components also very obvious to observants.
And even if you manage to hide both verbal and somatic component via sorcerer's subtle spell - spell dweomer still will be clearly visible to anyone who see spellcaster.
Hiding a spell can be an option like in a loud crowd, where no one directly observes you. But in dialog it's pointless even proposing any skillcheck to attempt of hiding the spell. It's waaaay too obvious.
P.S. Hence even psionics can't easily hide their power manifestation. It's likewise accompanied by sounds, visual, and other too obvious effects.
Last edited by Redwyrm; 18/10/20 01:57 PM.