Quote from TransmorpherDDS >>

This is something I've noticed in some live plays I've watched... some DMs tell their players the DC of challenges before they attempt them, which can create some interesting tension with the roll as the character has a concrete goal they're reaching for. However, I've always hid the DC, since in-character there's not like... a number that the character has to reach so I try to just narrate how well they did on a challenge... liek if they failed horrendously I narrate that, but if they get extremely close but just barely miss the DC I narrate how it's only the slightest issue that prevents them from succeeding, and they can plan from there. On the other hand stating the DC out loud sets it hard in stone... everyone at the table knows everyone else is being honest in those situations... I have to admit I've fudged the DC a few times in the past during important story stuff.

I generally do. And that's mostly because the way I DM'ed changed, due to the pandemic.

Prior to the pandemic - I didn't. Because I would see Monster A does Power A and needs a Wisdom DC 12.

I'd just say, "Player A! Give me a Wisdom Save!"

And we did it that way.

However, come the pandemic, and moving games remotely using Discord + Beyond20 - when the monster rolls into Discord it says what the DC is.

So I just got in the habit of telling them the DC for other things.

Player A: "I want to use acrobatics to try and leap from this branch to the one over on that tree."

Me: "Sure, DC is... let's just say 12. Go for it."

Rolls.