Option Decision:

LC practice:  Do not apply the designations of function specified by AACR2.  Exception:  The designation "ill." will be added to the headings for illustrators occurring in added entries in bibliographic records for resources intended for children.

Note that LC does apply the part of the rule that provides for using designations in specialist or archival cataloging from standard lists appropriate to the material being cataloged.  For example, in cataloging rare books, relator terms from MARC Code List for Relators may be used in subfield $e of universal and copy-specific added entries.

See also:

21.0.  Introductory Rules