foo.diff

diff --git a/Agents/Xamarin.Interactive/API/Xamarin.Interactive.api.cs b/Agents/Xamarin.Interactive/API/Xamarin.Interactive.api.cs
index 950929fb..5fd94c10 100644
--- a/Agents/Xamarin.Interactive/API/Xamarin.Interactive.api.cs
+++ b/Agents/Xamarin.Interactive/API/Xamarin.Interactive.api.cs
@@ -64,6 +64,10 @@ namespace Xamarin.Interactive
 			get;
 		}
 
+		void PublishEvaluationResult (Guid evaluationId, object result, EvaluationResultHandling resultHandling = EvaluationResultHandling.Replace);
+
+		void RegisterEvaluationContextHandler (Action<IEvaluationContext> handler);
+
 		void RegisterResetStateHandler (Action handler);
 	}
 	public interface IAgentIntegration
@@ -81,6 +85,42 @@ namespace Xamarin.Interactive
 		SynchronizationContext PushContext (SynchronizationContext context);
 	}
 }
+namespace Xamarin.Interactive.Evaluation
+{
+	public enum EvaluationPhase
+	{
+		None,
+		Compiled,
+		Evaluated,
+		Represented,
+		Completed
+	}
+	public enum EvaluationResultHandling
+	{
+		Replace,
+		Append
+	}
+	public interface IEvaluation
+	{
+		Guid Id {
+			get;
+		}
+
+		EvaluationPhase Phase {
+			get;
+		}
+
+		object Result {
+			get;
+		}
+	}
+	public interface IEvaluationContext
+	{
+		IObservable<IEvaluation> Evaluations {
+			get;
+		}
+	}
+}
 namespace Xamarin.Interactive.Logging
 {
 	public static class Log