New name.
OptionalplaylistIndex of the playlist to rename. An index past the last playlist fails with INVALID_INDEX. Give this or playlistGuid; with neither the call fails with INVALID_PARAMS.
OptionalplaylistPersistent unique identifier of a playlist (bracketed GUID, case-insensitive), used in place of a mutable index. Mutually exclusive with playlist; passing both or an invalid format fails with INVALID_PARAMS. Fails with NOT_FOUND if the playlist does not exist, never falling back. Invalid-format and not-found failures return the given GUID in details.playlistGuid.
Parameters for
playlist.rename. Rename a playlist. Fails withLOCKEDwhen a lock on the playlist refuses the new name, and withOPERATION_FAILEDwhen foobar2000 refuses it otherwise.