MongoDBGraphStore allows an option to validate syntax on insertion, but it requires "dbAdmin" and "atlasAdmin" privileges. Wrap the following in a try/except with a useful error message.

        if validate:
            collection.database.command(
                "collMod",
                collection.name,
                validator={"$jsonSchema": self._schema},
                validationAction=validation_action,
            )

Note that one need not have admin privileges if validation is set when the collection is created, so this option should also be available to the user, including directions.