The Add Field geoprocessing tool accepts in-memory geometry as valid input when used within ArcPy scripts and runs without returning any errors or warning messages regarding if, or where the output can be accessed.

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When running the above code within the Python window in ArcGIS Pro 2.2.2 with a map tab open, a new feature class is created within the default file geodatabase of the project. This feature class contains the previously constructed in-memory polygon geometry. Upon inspection of the attribute table of the feature class, the tabular schema consists of the newly-added field, along with other mandatory components of the file geodatabase polygon feature class tabular schema.

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