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Showing content from http://www.lispworks.com/documentation/lw80/lw/lw-hcl-170.htm below:

traced-arglist

*traced-arglist* Variable Summary

The list of arguments given to the function being traced.

Package

hcl

Initial Value

nil

Description

Upon entering a function that is being traced, the variable *traced-arglist* is bound to the list of arguments given to the function. *traced-arglist* is then printed after the function name in the output from tracing. It is accessible in the :before and :after forms to trace. However care should be used when manipulating this variable, since it is the value of *traced-arglist* itself that is used when calling the traced function. Thus if this value is altered by the :before forms then the function receives the altered argument list.

Examples

USER 14 > (trace (+ :before
                 ((setq *traced-arglist*
                     (mapcar #'1+ 
                          *traced-arglist*)))))

+ 
USER 15 > (+ 1 2 3)

0 + > (1 2 3) 
  (2 3 4) 
0 + < (9) 
9

Notes

*traced-arglist* is an extension to Common Lisp.