Noticed the description field is set as datetime format. The format key should be removed since this field is supposed to be text.
"description": {
"type": "string",
"format": "datetime",
"minGraphemes": 1,
"maxGraphemes": 140
},
thanks i have fixed this! not sure how that got in there. fwiw, the go-lexgen implementation treats all strings formats identically apparently, so no code changes were necessary here.