Please find some about phenix.mtz_as_cif usage below. In the next nightly build it will be displayed if you run the tool without arguments. Please let me know if you need additional information.
Best regards,Oleg Sobolev.
phenix.mtz_as_cif: Convert mtz to CIF format.Usage: phenix.mtz_as_cif data.mtz [params.eff] [options ...]
Usage examples:phenix.mtz_as_cif data.mtz
-------------------------------------------------------------------------------mtz_as_cif {mtz_file = Noneoutput_file = Nonemtz_labels = Nonecif_labels = None}