Stack effect tools
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Stack effect checking can be used interactively to print stack effects of quotations without running them. It can also be used from Smart combinators.
infer ( quot -- effect )

infer. ( quot -- )


There are also some words for working with effect instances. Getting a word's declared stack effect:
stack-effect ( word -- effect/f )


Converting a stack effect to a string form:
effect>string ( obj -- str )


Comparing effects:
effect-height ( effect -- n )

effect<= ( effect1 effect2 -- ? )

effect= ( effect1 effect2 -- ? )


The class of stack effects:
effect

effect? ( object -- ? )