This Roll20 API Script solves the error prone task of updating your character sheet when resting. Using !long-rest and !short-rest commands will update your sheet, and report to you everything it is doing.

Select your character, then run the !short-rest command. It will:

• check your hit points and hit dice, and remind you to use them if needed.

• replenish Warlock Pact Magic spell slots. This works correctly even if you are a multiclass spell caster.

• replenish class specific resources, like Wild Shape, Second Wind and Channel Divinity.

  👍 It knows that Bards regain Bardic Inspiration at class level 5.

  👍 It knows that Sorcerers gain 4 Sorcery Points at class level 20.

• replenish subclass specific resources, like Superiority Dice and Hexblade's Curse.

• remind Wizards to use Arcane Recovery, and Bards to use Song of Rest.

• turn off global modifiers with a short duration, like Bless, Sacred Weapon and Shield of Faith.

Select your character, then run the !long-rest command. It will:

• replenish your hit points.

• replenish the correct number of hit dice (even at lvl 1).

• remove temporary hit points.

• reduce exhaustion level.

• replenish spell slots.

• replenish class specific resources, like Lay on Hands, Arcane Recovery and Rage.

• replenish subclass specific resources, like Consult the Spirits and Avenging Angel.

• replenish race specific resources, like Breath Weapon and Relentless Endurance.

• turn off global modifiers with long durations, like Mage Armor.

Resting in Style will generally do the right thing out of the box, as long as you're using the 5th Edition OGL by Roll20 character sheet.

However, not all resources are automatically added to the Resource boxes. You might have to add them yourself.

For instance, a Wizard starts with the Arcane Recovery skill. This is not tracked in the sheet. Add a custom resource box, set the Total to 1, the value to 1, and the name to "Arcane Recovery".

Resting in Style will detect the new resource by name, and start notifying you to use it on short rests, and replenish it on long rests.

No worries. If your skill is called "Homebrew Resource", you can rename it to "Homebrew Resource [l]" to reset it every long rest. If you instead postfix it with "[s]", then it is reset every short and long rest.

Also: Please let me know if I have missed any skills in the official source books, I'll happily add the support.

Let's look at Wand of Magic Missiles. The wand regains 1d6+1 expended charges daily at dawn. We can approximate that by tying it to a long rest like this:

Wand of Magic Missiles [l+1d6+1]

The first character in the brackets is a lower case L, meaning it will trigger after a long rest. The +1d6+1 is rolled and added to the resource (up to the maximum).

You can replace the l with an s to trigger after a short rest. Thanks to @keithcurtis1 who did this first in his Rest and Recovery-script.

There are some skills that give characters access to spells that can be used once a day without using spell slots:

• Drow Magic
• Firbolg Magic
• Mystic Arcanum (Warlock)
• Signature Spells (Wizard)
• Infernal Legacy (Tiefling)
• Githyanki Psionics (Gith)
• Control Air and Water (Triton)
• Innate Spellcasting (Yuan-ti Pureblood)
• Magic Initiate (Feat)

I'm not sure how these should be handled. You can easily fix it yourself by adding the [l] postfix to a resource box, like this:

Mystic Arcanum: Eyebite [l]

I would also like to support it out of the box somehow, but I'm not sure about the best way to do it.

For technical reasons, if you want DeathTracker to notice changes in hitpoints after resting, you must also install the TokenMod script.