code: def loaded_instruments(self) -> Dict[str, Optional['InstrumentContext']]:
          
          return {mount.name.lower(): instr for mount, instr
                  in self._instruments.items()}
docs: Get the instruments that have been loaded into the protocol.
  
          :returns: A dict mapping mount names in lowercase to the instrument
                    in that mount, or `None` if no instrument is present.