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Guile's interactive debugger is a command line application that accepts commands from you for examining the stack and, if at a breakpoint, for continuing program execution in various ways. Unlike in the normal Guile REPL, commands are typed mostly without parentheses.
When you first enter the debugger, it introduces itself with a message like this:
This is the Guile debugger -- for help, type `help'.
There are 3 frames on the stack.
Frame 2 at standard input:36:19
[+ 3 #\s]
debug>
“debug>” is the debugger's prompt, and a useful reminder that you are not in the normal Guile REPL. The available commands are described in detail in the following subsections.