arcpy - Why are results from Python tool not in Results window?

I am relatively new to ArcPy 10. and I want to return the list of feature class from a dataset. I can see them through the message, but cannot see them from the result window. Actually there are only inputs, environments and messages I can view from the results window. Am I missing something in the script? Thanks.

    import arcpy

    import json
    from arcpy import env
    env.workspace=r"C:\sde\pan18.sde"
    featureDatasets = arcpy.ListDatasets("SDE.POINT_OF_INTEREST")
    fd=featureDatasets[0];
    fcList=arcpy.ListFeatureClasses("*", "ALL", fd)
    pf=[]
    for fc in fcList:
       pf.append(fc)
    arcpy.AddMessage("--------Encode the list to a json string-\n")

    layerlistEncode=json.dumps({'resource':pf})
    print layerlistEncode
    arcpy.AddMessage("--------Encode the json string to a list\n")
    layerlistDecode=json.loads(layerlistEncode)
    print layerlistDecode
    print layerlistDecode["resource"]
    arcpy.SetParameterAsText(0, layerlistEncode)

    arcpy.AddMessage(layerlistEncode)
    arcpy.AddMessage("finished1")


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Answer

You need to set up a derived, output parameter for SetParameterAsText to have any effect. See the help on Setting script tool parameters.