rename_tags.py

import arcpy
import sys

AGRC = 'AGRC'

def get_tags_from_string(text):
  if text is None:
      return []

  return [tag.strip() for tag in text.split(',')]

def fix_tags(table):
  print(f'Checking: {table}')
  metadata = arcpy.metadata.Metadata(table)

  tags = get_tags_from_string(metadata.tags)

  if AGRC in tags:
    tags.remove(AGRC)
    tags.append('UGRC')

    old_tags = metadata.tags
    metadata.tags = ', '.join(tags)

    metadata.save()

    print(f'---tags were updated from: {old_tags} to: {metadata.tags}')

workspace = sys.argv[1]

arcpy.env.workspace = workspace

tables = arcpy.ListTables() + arcpy.ListFeatureClasses()

for table in tables:
  fix_tags(table)