Just mash no sparge

[Vallka]

Been looking at a few recipes and have come across some that have very little detail for actually brewing them. This one just says "mash at 154-159°" so is the way to do it?
https://www.homebrewersassociation.org/homebrew-recipe/nazz-session-ipa/

 

[Ozarks Mountain Brewery]

its a pretty generic recipe meaning mash anywhere in that area as you see fit, sparging is up to your set up

 

[J A]

Most beer "recipes" don't include specific instructions because systems vary and you have to figure out volumes and amounts based on the specifics of your system.
Usually you'll get grain bill, mash temps and times and hop schedule for boil but everything is variable based on your mash efficiency and the AA values of the specific hops you're using.