diff --git a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
index 0f7828da..6b3c1dca 100644
--- a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
+++ b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
@@ -2,17 +2,14 @@ package inr.numass
 
 import hep.dataforge.grind.GrindLauncher
 import hep.dataforge.grind.GrindShell
-import hep.dataforge.workspace.Workspace
 
 /**
  * Created by darksnake on 29-Aug-16.
  */
 
 new GrindShell().start {
-    Workspace numass = new GrindLauncher()
+    GrindLauncher numass = new GrindLauncher()
             .withSpec(NumassWorkspaceSpec)
             .from(new File("D:\\Work\\Numass\\sterile2016\\workspace.groovy"))
-            .buildWorkspace()
-    setContext(numass.getContext())
     bind("numass", numass)
 }
\ No newline at end of file
diff --git a/numass-main/src/main/java/inr/numass/workspace/NumassPrepareTask.java b/numass-main/src/main/java/inr/numass/workspace/NumassPrepareTask.java
index 7835b58e..ef8de10a 100644
--- a/numass-main/src/main/java/inr/numass/workspace/NumassPrepareTask.java
+++ b/numass-main/src/main/java/inr/numass/workspace/NumassPrepareTask.java
@@ -9,6 +9,8 @@ import hep.dataforge.actions.Action;
 import hep.dataforge.computation.ProgressCallback;
 import hep.dataforge.context.Context;
 import hep.dataforge.data.*;
+import hep.dataforge.description.DescriptorBuilder;
+import hep.dataforge.description.NodeDescriptor;
 import hep.dataforge.meta.Meta;
 import hep.dataforge.meta.MetaBuilder;
 import hep.dataforge.meta.Template;
@@ -166,4 +168,12 @@ public class NumassPrepareTask extends AbstractTask<Table> {
         return "numass.prepare";
     }
 
+    @Override
+    public NodeDescriptor getDescriptor() {
+        return new DescriptorBuilder(getName())
+                .addNode("prepare", PrepareDataAction.class)
+                .addNode("monitor", MonitorCorrectAction.class)
+                .addNode("merge", MergeDataAction.class)
+                .build();
+    }
 }