Tokens don't work in descriptions. You can use them in the character's journal, but not an item which is a journal.

However, starting with v.1.69, the devs introduced SetDescription and GetDescription.

So (this is off the top of my head and has not been tested):

// get all of your relevant variables. (you could avoid using a lot of these variables with some careful programming.
object oPC = <use a function to get your PC -- this could be when the chest is opened
string sName = GetName(oPC);
object oBook = <use a function or set of functions to get your book>
string sDesc = GetDescription(oBook);

// Replace the characters <name> with the player's name.
sDesc = StringReplace(sDesc, "<name>", sName);
SetDescription(oBook, sDesc);


That should do it. There's probably some functions to get the player's first and last name, but I don't know it off hand. You can tear through www.nwnlexicon.com to see if you can find something. I didn't see it.

As mentioned above, you can avoid a lot variables to speed things up a tiny bit by doing something like:

SetDescription(oBook, StringReplace(GetDescription(oBook), "<name>", GetName(oPC)));
But that was harder to read. :)

I hope that helps.

Once you get a fair amount done, you should share it with us!