Color codes and variables are allowed. For a list of color codes look
[here](/databases/misc/colorcodes). Variables can be found
[here](/skills/stringvariables).
The command specified will not function correctly if it contains double
quotes " or curly brackets {} and must be substitued with their
respective [message variables](/skills/stringvariables). For a more
in-depth tutorial on how to use command-skills see [command-skills
tutorial](/tutorials/commandskills). That happens because the double
quotes and curly brackets are reserved for MythicMobs itself trying to
read the syntax you supplied.
`Update: as of MythicMobs 2.4 curly brackets {} do not need to be replaced with message variables anymore. Double quotes " however, still need replacements.`