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If the OP is questioning whether the DM should reveal the roll, then the answer is, mostly no. Explained in the latter pages of the DMG, hidden rolls basically allow suspense and uncertainty. If you don’t trust your DM, then you need to have a talk with them.  (DMG pg. 235)

Shield

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

As the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

You should know if the attack hits or not, any statistic ventures into the realm of metagaming. Now, a certain level of metagaming will happen, but is not a big issue if you leave that for OoC (Out of Character) times.

Take a moment to actually put yourself in the situation, a round is 6 seconds, as soon as you feel that weapon strike (that nanosecond the weapon would make physical contact, not just guessing it would) against your body, you mutter some words and wave your hand. Then POOF, you acted just in the nick of time to bring forth a barrier in hopes to block said strike.

If you know if the attack roll was too high enough to use the spell, then the spell is pointless. You are taking a chance to prevent yourself from injury or worse.

If the OP is questioning whether the DM should reveal the roll, then the answer is, mostly no. Explained in the latter pages of the DMG, hidden rolls basically allow suspense and uncertainty. If you don’t trust your DM, then you need to have a talk with them. (See the "Dice Rolling" section on DMG pg. 235.)

The shield spell description states:

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

As the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

You should know if the attack hits or not, any statistic ventures into the realm of metagaming. Now, a certain level of metagaming will happen, but is not a big issue if you leave that for OoC (Out of Character) times.

Take a moment to actually put yourself in the situation, a round is 6 seconds, as soon as you feel that weapon strike (that nanosecond the weapon would make physical contact, not just guessing it would) against your body, you mutter some words and wave your hand. Then POOF, you acted just in the nick of time to bring forth a barrier in hopes to block said strike.

If you know if the attack roll was too high enough to use the spell, then the spell is pointless. You are taking a chance to prevent yourself from injury or worse.

Shield

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

As the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

You should know if the attack hits or not, any statistic ventures into the realm of metagaming. Now, a certain level of metagaming will happen, but is not a big issue if you leave that for OoC (Out of Character) times.

Take a moment to actually put yourself in the situation, a round is 6 seconds, as soon as you feel that weapon strike (that nanosecond the weapon would make physical contact, not just guessing it would) against your body, you mutter some words and wave your hand. Then POOF, you acted just in the nick of time to bring forth a barrier in hopes to block said strike.

If you know if the attack roll was too high enough to use the spell, then the spell is pointless. You are taking a chance to prevent yourself from injury or worse.

If the OP is questioning whether the DM should reveal the roll, then the answer is, mostly no. Explained in the latter pages of the DMG, hidden rolls basically allow suspense and uncertainty. If you don’t trust your DM, then you need to have a talk with them. (DMG pg. 235)

Shield

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

As the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

You should know if the attack hits or not, any statistic ventures into the realm of metagaming. Now, a certain level of metagaming will happen, but is not a big issue if you leave that for OoC (Out of Character) times.

Take a moment to actually put yourself in the situation, a round is 6 seconds, as soon as you feel that weapon strike (that nanosecond the weapon would make physical contact, not just guessing it would) against your body, you mutter some words and wave your hand. Then POOF, you acted just in the nick of time to bring forth a barrier in hopes to block said strike.

If you know if the attack roll was too high enough to use the spell, then the spell is pointless. You are taking a chance to prevent yourself from injury or worse.

Shield

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

However order you confirm a hit or not, as the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

Shield

Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

As the spell states including the triggering attack, meaning when you confirm the attack as a hit, you then can choose to cast Shield as a reaction. RAW

You should know if the attack hits or not, any statistic ventures into the realm of metagaming. Now, a certain level of metagaming will happen, but is not a big issue if you leave that for OoC (Out of Character) times.

Take a moment to actually put yourself in the situation, a round is 6 seconds, as soon as you feel that weapon strike (that nanosecond the weapon would make physical contact, not just guessing it would) against your body, you mutter some words and wave your hand. Then POOF, you acted just in the nick of time to bring forth a barrier in hopes to block said strike.

If you know if the attack roll was too high enough to use the spell, then the spell is pointless. You are taking a chance to prevent yourself from injury or worse.