The getfunctionrestrictions function can be used to gain access to the restriction string associated with a CLIPS or user defined function. The restriction string contains information on the number and types of arguments that a function expects. See section 3.1 of the Advanced Programming Guide for the meaning of the characters which compose the restriction string.
Syntax
(get-function-restrictions <function-name>)
Example
CLIPS> (get-function-restrictions +) "2*n" CLIPS>