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Creating command flow for Dice Roll

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Posted on by jomaor1

Hello, I'm new to Power Automate and I'm basically trying to create a bot to roll dice in a Group chat.

I got to a point where I'm just stuck, and I got nowhere else to go. This is the Input and Output i want:

Input Message: "/roll d20"

Output Message/Card: "You rolled a 17!"

And I'm just stuck, I had errors to get the message body, but now I'm stuck trying to do rand( 1 , int( slice( messagebody, 8, 3))+1)

Apparently i cannot sum 1 even after i converted the 20 value to an int (because rand() needs to sum+1 so that it can go up to 20)

Any ideas how to fix this? or even how to help me get the correct flow for this?

Thanks!

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David_MA 15,350 Super User 2026 Season 2 on at

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I am not really understanding what you want to do since a traditional six-sided dice has only six values from 1 to 6. How do you roll a 17? Or is that the problem you are having? If so, you can use the following expression to generate a number from 1 to 6:

rand(1,6)

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jomaor1 10 on at

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Hello, thanks for the reply!

Sorry, maybe I wasn't too clear. There are OTHER dice sizes, so if the user types /roll d20, it should roll a dice with 20 sides. Which is very common in RPGs settings (DnD).

Another problem is that you stated that rand(1,6) returns 1 through 6. This is incorrect, the function will return between 1 and 5. So I always need to sum 1 to the dice size the user chose.

That's why it should be rand( 1, user_size + 1)

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David_MA 15,350 Super User 2026 Season 2 on at

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I don't think I am wrong with regard to rand(1,6) returning 1, 2, 3, 4, 5, and 6, but let's say I am. In that case, change the expression to rand(1,7). Then for your 20-sided dice, use rand(1,21)

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jomaor1 10 on at

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Hello! 2 things:

1 - Just ran a test with just a loop of 50 rand(1,6) and got 0 6's. So I need to sum 1 to the number.
2 - The dice number is variable and should be chosen by the user. So I cannot just go with 1 IF() to see if it's 6 sided or 20 sided...

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David_MA 15,350 Super User 2026 Season 2 on at

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If the user is choosing how many sides the die has, use this expression:

rand(1,add(int(triggerBody()['number']),1))

You will replace triggerBody()['number'] with the dynamic content provided by the user.

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CU27110513-0 2 on at

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I’ve messed around with this kind of thing before, and yeah, getting it to work can be a bit of a pain. The issue is that rand() doesn’t include the upper number unless you bump it up by 1. What worked for me was using something like this:
rand(1, add(int(slice(triggerBody()['messagebody'], 8, 3)), 1))
Basically, it grabs the number of sides (like the 20 from /roll d20), turns it into an integer, and adds 1 so it rolls the full range.
If you want to double-check that it’s rolling properly, you could test it with a dice simulator first to make sure the numbers feel right.

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Chriddle 8,713 Super User 2026 Season 2 on at

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> Just ran a test with just a loop of 50 rand(1,6) and got 0 6's. So I need to sum 1 to the number.

Just read the documentation ;)

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@rtdlov 18 on at

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I think there is enough information in the comments to make the question answered. "Rand" function is tricky, you would have to consider increasing the last integer by one (hardcoding or dynamically) when providing a range for it for the max value you wish to be included. For example:

When you simulate rolling a dice - set your variable with rand(1,7), because 1 is min and 7 max will give you value of 6 eventually.

Same when dealing with index integer (part between ?[ ]? ) to pick a random row from a list. A range in a rand function would start with 0 minimum (as intended) and max value can be counted with length function, no need to add anything, or subtract as I though previously before confirming my suspicion with documentation that something is wrong here. :)

For example:

When you have a custom function expression (should be lean) to Update an item lookup field with randomly picked ID item from Get items action -

outputs('Get_items')?['body/value']?[rand(0,length(outputs('Get_items')?['body/value']))]?['ID']

Regards

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