To get an IRIS session integrated in VSCode terminal, you can add it to settings.json :

  "terminal.integrated.profiles.windows": {
        "IRIS Terminal": {
            "path": [
                "C:\\InterSystems\\IRISHealth\\bin\\irissession.exe"
            ],
            "args": ["<instance name>"],
            "icon": "terminal-cmd"
        }
    }

However, this terminal window will lack the niceties of the ISC Terminal application, such as command history.

Hi Ben,
You can use EnsLib.HL7.Schema ResolveSchemaTypeToDocType() class method to resolve DocType dynamically.
For example, if message is an OREF to an instance of EnsLib.HL7.Message :

s message.DocType = ##class(EnsLib.HL7.Schema).ResolveSchemaTypeToDocType("2.5",message.Name)