MGS8003: malformed output ref
magus query output <ref> retrieves one target execution's captured output by its
reference id (magus query output out1a2b3c). This code fires when the argument is
not a well-formed ref<hex> id, so it cannot name a stored output.
output is an explicit subcommand, so a bare search term is never mistaken for a
ref: magus query refactor queries the knowledge graph. This code is reserved for
the case where you asked for output retrieval but the id is malformed.
Resolution
Pass a valid reference id (printed on each target's result line when it runs), or
drop output to run a knowledge-graph search. To open the knowledge graph in a
browser instead, use magus graph open.