[Place + Remove item = Crash]

May I ask why you are removing the item from the player's inventory when it would be naturally removed assuming that the player would be in survival?

[Help.]

I ran into the same issue! The work around I found was to use the skript addon Tablisknu which also requires ProtocolLib.

In my code I used:

set the tablist header of player to "&8--«&4Murder&8»--"
set the tablist footer of player to "&8------------"

 

[Place + Remove item = Crash]

It seems that you are removing the tool from itself? I'm guessing that you meant to remove the tool from the player's inventory.

Try this instead:

remove 1 of tool from the player's inventory

 

[Chatcolor script prefix doesnt work]

Hello KKallas!

Please note that I assumed when you said "prefixes" that you mean group prefixes, as in prefixes that are part of a permissions plugin. After testing your skript on my server I ran into no issues with changing my chat color as well as keeping my group prefix. I used your skript as well as Luck Perms to test it.

If you would like further assistance could you please provide me with your permissions plugin as well as other another possible plugins that you suspect may be preventing your prefix from showing such as plugins that alter chat.

Thanks!

[Set a player's permissions]

Yes there is!

First of all you will need to have this at the start of your skript:

script options:
    $ use permissions

With this you are able to view and manage player's permissions, for example:

add "permission.permission" to player's permissions
remove "permission.permission" from player's permissions

Note: You will need skQuery for this to work.