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Coding

Create the file /home/user/things/Frog.cs:

using BaseLib;
using BaseLib.Events.Speech;
using BaseLib.Impl.Behaviours;

using System;
using System.Linq;


namespace TestLib
{

    public class Frog : NPC
    {
        public Frog()
        {

            AddClassification("thing.animal.frog");
            AddClassification("colour.green");

            Nouns = new string[] { "tree frog" };
            Plurals = new string[] {"tree frogs" };

            ShortDescription = "green tree frog";
            PluralDescription = "green tree frogs";
            LongDescription = "A cute green tree frog.  It walks around and does simple maths.";


            Weight = 3f;

            RandomWalk rw = new RandomWalk(this);

            AddNumbers an = new AddNumbers(this);
            an.ShouldRun = () => {
                return an.Running || RecentEvents.Any( e => {
                    var ev = e as SayEvent;
                    return ev != null && ev.Message.ToLower().Contains("math");
                });
            };

            BehaviourList bl = new BehaviourList(this);

            bl.AddBehaviour(an);
            bl.AddBehaviour(rw);

            this.Brain = new Brain(bl);
            this.Brain.Start();

        }

        private class AddNumbers : Behaviour {

            public bool Running { get; set; }

            public AddNumbers(NPC npc) : base(npc)
            {
                Running = false;
            }

            public override void Run ()
            {
                npc.RecentEvents.Clear();
                Running = true;

                Sleep(.5);
                npc.Say("I like to add things!  Tell me a number!");

                int firstNumber = 0;
                var say = WaitForEvent<SayEvent>( ev => {                     
                    return int.TryParse(ev.Message, out firstNumber); 
                }, 15);

                if(say == null) {
                    npc.Say("Fine then, don't tell me a number...");
                    Sleep(.5);
                    npc.Emote("sighs");
                    Running = false;
                    return;
                }

                Sleep(.5);
                npc.Say("Great!  Now tell me another number!");

                int secondNumber = 0;
                say = WaitForEvent<SayEvent>( ev => {                     
                    return int.TryParse(ev.Message, out secondNumber); 
                }, 15);

                if(say == null) {
                    npc.Say("Aww, I really wanted you to tell me another number!");
                    Sleep(.5);
                    npc.Emote("pouts");
                    Running = false;
                    return;
                }

                Sleep(1);
                npc.Emote("thinks");
                Sleep(3);
                int total = firstNumber + secondNumber;
                npc.Say("If you add both numbers together, you get " + total + "!");
                Sleep(.5);
                npc.Emote("cheers");

                Running = false;
            }

            public override void OnStop ()
            {
                Running = false;
            }

        }

    }   
}

To compile it once saved:

compile /home/user/things/Frog.cs

To create it once compiled:

create User.Things.Frog