Toolbox Tool parameter visible but not enabled

[samuel_e]

I am adapting a custom Python toolbox from ArcMap to ArcGIS Pro which assigns land use codes to parcels. This specific tool is for a special "Uncodable" label, so there is no user input besides clicking run.

In ArcMap, the code parameter appears filled in with the default value, but not editable:

I would like to know if there is a way to do the same in Pro: can I have the parameter be visible, but disabled so it can't be changed?

I want this so coders can do a visual check that Yes, this is the right code that I want to apply. If it's not possible to do that, is there a way to just put descriptive text in the Parameters pane saying "You are going to code it such and such"? Or can I add a message that no action is required? Since there is a parameter, but disabled, I can't even get the "no parameters" message.

Thank you!

[DanPatterson · Accepted solution]

would a derived parameter work?

Setting script tool parameters—ArcGIS Pro | Documentation

you can use SetParameterAsText or SetParameter there

[JohannesLindner]

As Dan said, you could set it to Derived, that will show the "No parameters" message.

Alternatively, you can just reset the parameter's value in the updateParameters() method:

class Tool(object):
    def __init__(self):
        self.label = "Tool"
        self.description = ""
        self.canRunInBackground = False

    def getParameterInfo(self):
        return [
            arcpy.Parameter(name="code", displayName="Land Use Code", datatype="GPString", parameterType="Required", direction="Input")
            ]

    def updateParameters(self, parameters):
        parameters[0].value = "9999 - Not Classifiable"

    def updateMessages(self, parameters):
        parameters[0].setWarningMessage("This parameter is for information only, you can't edit it.")

    def execute(self, parameters, messages):
        return

[DanPatterson]

With a custom python toolbox, you can set the above within the tool dialog