The npc.tags key defines every tag available to character files. The command info can show details about the configured tags for a given system or campaign. Adding a new tag is as easy as adding a new entry under npc.tags in either your user settings or the campaign’s settings. You can also override and change an existing tag by adding an entry with that tag’s name.
Tip
When overwriting an existing tag, change the desc and doc strings so that they match the new changes to the tag. For example, if you add replaced_by, use desc and doc to describe why the replacement was made.
One of the most common reasons to add a tag is to support some facet of a new system. The FATE system, for example, requires every character to have a Concept. This new concept tag can be defined as follows:
tags:concept:desc:The character's high conceptrequired:truemax:1
The @concept tag will now be recognized in character files in a campaign that uses the FATE system.