Currently, CLIPS only show function arguments when watch is enabled, without functon call results. e.g.:
% clips
CLIPS (Cypher Alpha 9/1/17)
CLIPS> (deffunction add1 (?i) (+ 1 ?i))
CLIPS> (deffunction add2 (?i) (+ 1 (add1 ?i)))
CLIPS> (watch all)
CLIPS> (add2 10)
DFN >> add2 ED:1 (10)
DFN >> add1 ED:2 (10)
DFN << add1 ED:2 (10)
DFN << add2 ED:1 (10)
12
CLIPS>
It would be nice if function call results can also be printed.