diff --git a/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/DataNode.kt b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/DataNode.kt
index 6081a13e..02fc6a9e 100644
--- a/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/DataNode.kt
+++ b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/DataNode.kt
@@ -208,4 +208,9 @@ fun <T : Any> DataNode<T>.filter(predicate: (Name, Data<T>) -> Boolean): DataNod
 
 fun <T: Any> DataNode<T>.first(): Data<T> = data().first().second
 
+/**
+ * Check that node is compatible with given type meaning that each element could be cast to the type
+ */
+expect fun DataNode<*>.checkType(type: KClass<*>)
+
 //fun <T : Any, R: T> DataNode<T>.filterIsInstance(type: KClass<R>): DataNode<R> = filter{_,data -> type.}
\ No newline at end of file
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/GroupBuilder.kt b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/GroupBuilder.kt
similarity index 91%
rename from dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/GroupBuilder.kt
rename to dataforge-data/src/commonMain/kotlin/hep/dataforge/data/GroupBuilder.kt
index 68e9e092..0820c162 100644
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/GroupBuilder.kt
+++ b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/GroupBuilder.kt
@@ -18,7 +18,6 @@ package hep.dataforge.data
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.string
-import java.util.*
 
 interface GroupRule {
     operator fun <T : Any> invoke(node: DataNode<T>): Map<String, DataNode<T>>
@@ -40,7 +39,8 @@ object GroupBuilder {
      * @param defaultTagValue
      * @return
      */
-    fun byValue(key: String, defaultTagValue: String): GroupRule = object : GroupRule {
+    fun byValue(key: String, defaultTagValue: String): GroupRule = object :
+        GroupRule {
         override fun <T : Any> invoke(node: DataNode<T>): Map<String, DataNode<T>> {
             val map = HashMap<String, DataTreeBuilder<T>>()
 
@@ -62,7 +62,12 @@ object GroupBuilder {
 //    )
     fun byMeta(config: Meta): GroupRule {
         //TODO expand grouping options
-        return config["byValue"]?.string?.let { byValue(it, config["defaultValue"]?.string ?: "default") }
+        return config["byValue"]?.string?.let {
+            byValue(
+                it,
+                config["defaultValue"]?.string ?: "default"
+            )
+        }
             ?: object : GroupRule {
                 override fun <T : Any> invoke(node: DataNode<T>): Map<String, DataNode<T>> = mapOf("" to node)
             }
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/JoinAction.kt b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/JoinAction.kt
similarity index 94%
rename from dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/JoinAction.kt
rename to dataforge-data/src/commonMain/kotlin/hep/dataforge/data/JoinAction.kt
index 6f2cf3f9..228b6c81 100644
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/JoinAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/JoinAction.kt
@@ -9,7 +9,6 @@ import hep.dataforge.names.toName
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 import kotlin.reflect.KClass
-import kotlin.reflect.full.isSuperclassOf
 
 
 class JoinGroup<T : Any, R : Any>(var name: String, internal val node: DataNode<T>) {
@@ -76,9 +75,7 @@ class JoinAction<T : Any, R : Any>(
 ) : Action<T, R> {
 
     override fun invoke(node: DataNode<T>, meta: Meta): DataNode<R> {
-        if (!this.inputType.isSuperclassOf(node.type)) {
-            error("$inputType expected, but ${node.type} received")
-        }
+        node.checkType(inputType)
         return DataNode.build(outputType) {
             JoinGroupBuilder<T, R>(meta).apply(action).buildGroups(node).forEach { group ->
 
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/PipeAction.kt b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/PipeAction.kt
similarity index 92%
rename from dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/PipeAction.kt
rename to dataforge-data/src/commonMain/kotlin/hep/dataforge/data/PipeAction.kt
index 268fafec..f106df40 100644
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/PipeAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/PipeAction.kt
@@ -5,7 +5,6 @@ import hep.dataforge.names.Name
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 import kotlin.reflect.KClass
-import kotlin.reflect.full.isSuperclassOf
 
 class ActionEnv(val name: Name, val meta: Meta)
 
@@ -33,9 +32,8 @@ class PipeAction<T : Any, R : Any>(
 ) : Action<T, R> {
 
     override fun invoke(node: DataNode<T>, meta: Meta): DataNode<R> {
-        if (!this.inputType.isSuperclassOf(node.type)) {
-            error("$inputType expected, but ${node.type} received")
-        }
+        node.checkType(inputType)
+
         return DataNode.build(outputType) {
             node.data().forEach { (name, data) ->
                 //merging data meta with action meta (data meta is primary)
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/SplitAction.kt b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/SplitAction.kt
similarity index 87%
rename from dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/SplitAction.kt
rename to dataforge-data/src/commonMain/kotlin/hep/dataforge/data/SplitAction.kt
index 38740124..3aa08990 100644
--- a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/SplitAction.kt
+++ b/dataforge-data/src/commonMain/kotlin/hep/dataforge/data/SplitAction.kt
@@ -10,11 +10,10 @@ import kotlin.collections.set
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 import kotlin.reflect.KClass
-import kotlin.reflect.full.isSuperclassOf
 
 
 class FragmentRule<T : Any, R : Any>(val name: Name, var meta: MetaBuilder) {
-    lateinit var result: suspend (T) -> R 
+    lateinit var result: suspend (T) -> R
 
     fun result(f: suspend (T) -> R) {
         result = f;
@@ -43,9 +42,7 @@ class SplitAction<T : Any, R : Any>(
 ) : Action<T, R> {
 
     override fun invoke(node: DataNode<T>, meta: Meta): DataNode<R> {
-        if (!this.inputType.isSuperclassOf(node.type)) {
-            error("$inputType expected, but ${node.type} received")
-        }
+        node.checkType(inputType)
 
         return DataNode.build(outputType) {
             node.data().forEach { (name, data) ->
@@ -56,7 +53,7 @@ class SplitAction<T : Any, R : Any>(
 
 
                 // apply individual fragment rules to result
-                split.fragments.forEach { fragmentName, rule ->
+                split.fragments.forEach { (fragmentName, rule) ->
                     val env = FragmentRule<T, R>(fragmentName, laminate.builder())
 
                     rule(env)
diff --git a/dataforge-data/src/jsMain/kotlin/hep/dataforge/data/checkType.kt b/dataforge-data/src/jsMain/kotlin/hep/dataforge/data/checkType.kt
new file mode 100644
index 00000000..56d1d0c9
--- /dev/null
+++ b/dataforge-data/src/jsMain/kotlin/hep/dataforge/data/checkType.kt
@@ -0,0 +1,10 @@
+package hep.dataforge.data
+
+import kotlin.reflect.KClass
+
+/**
+ * Check that node is compatible with given type meaning that each element could be cast to the type
+ */
+actual fun DataNode<*>.checkType(type: KClass<*>) {
+    //Not supported in js yet
+}
\ No newline at end of file
diff --git a/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt b/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt
new file mode 100644
index 00000000..0b4c602f
--- /dev/null
+++ b/dataforge-data/src/jvmMain/kotlin/hep/dataforge/data/checkType.kt
@@ -0,0 +1,13 @@
+package hep.dataforge.data
+
+import kotlin.reflect.KClass
+import kotlin.reflect.full.isSuperclassOf
+
+/**
+ * Check that node is compatible with given type meaning that each element could be cast to the type
+ */
+actual fun DataNode<*>.checkType(type: KClass<*>) {
+    if (!type.isSuperclassOf(type)) {
+        error("$type expected, but $type received")
+    }
+}
\ No newline at end of file
diff --git a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
index 0e07147c..eaaac235 100644
--- a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/TaskModel.kt
@@ -58,9 +58,13 @@ fun TaskModel.buildInput(workspace: Workspace): DataTree<Any> {
     }.build()
 }
 
+@DslMarker
+annotation class TaskBuildScope
+
 /**
  * A builder for [TaskModel]
  */
+@TaskBuildScope
 class TaskModelBuilder(val name: String, meta: Meta = EmptyMeta) {
     /**
      * Meta for current task. By default uses the whole input meta
diff --git a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/WorkspaceBuilder.kt b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/WorkspaceBuilder.kt
index 99348682..e6284b47 100644
--- a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/WorkspaceBuilder.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/WorkspaceBuilder.kt
@@ -11,6 +11,7 @@ import hep.dataforge.names.toName
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.GlobalScope
 
+@TaskBuildScope
 interface WorkspaceBuilder {
     val parentContext: Context
     var context: Context
diff --git a/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/GenericTask.kt b/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/GenericTask.kt
index e2236c6a..ddb5e94d 100644
--- a/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/GenericTask.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/hep/dataforge/workspace/GenericTask.kt
@@ -1,5 +1,6 @@
 package hep.dataforge.workspace
 
+import hep.dataforge.context.Context
 import hep.dataforge.data.*
 import hep.dataforge.descriptors.NodeDescriptor
 import hep.dataforge.meta.Meta
@@ -63,6 +64,7 @@ class GenericTask<R : Any>(
     //TODO add validation
 }
 
+@TaskBuildScope
 class KTaskBuilder(val name: String) {
     private var modelTransform: TaskModelBuilder.(Meta) -> Unit = { data("*") }
     var descriptor: NodeDescriptor? = null
@@ -73,7 +75,7 @@ class KTaskBuilder(val name: String) {
     private class DataTransformation(
         val from: String = "",
         val to: String = "",
-        val transform: Workspace.() -> TaskModel.(DataNode<Any>) -> DataNode<Any>
+        val transform: (Context, TaskModel, DataNode<Any>) -> DataNode<Any>
     ) {
         operator fun invoke(workspace: Workspace, model: TaskModel, node: DataNode<Any>): DataNode<Any>? {
             val localData = if (from.isEmpty()) {
@@ -81,7 +83,7 @@ class KTaskBuilder(val name: String) {
             } else {
                 node.getNode(from.toName()) ?: return null
             }
-            return transform(workspace).invoke(model, localData)
+            return transform(workspace.context, model, localData)
         }
     }
 
@@ -91,27 +93,23 @@ class KTaskBuilder(val name: String) {
         this.modelTransform = modelTransform
     }
 
-    //class TaskEnv(val workspace: Workspace, val model: TaskModel)
-
     fun <T : Any> transform(
         inputType: KClass<T>,
         from: String = "",
         to: String = "",
-        transform: Workspace.() -> TaskModel.(DataNode<T>) -> DataNode<Any>
+        block: TaskModel.(Context, DataNode<T>) -> DataNode<Any>
     ) {
-        dataTransforms += DataTransformation(from, to) {
-            { data: DataNode<Any> ->
-                transform().invoke(this, data.cast(inputType))
-            }
+        dataTransforms += DataTransformation(from, to) { context, model, data ->
+            block(model, context, data.cast(inputType))
         }
     }
 
     inline fun <reified T : Any> transform(
         from: String = "",
         to: String = "",
-        noinline transform: Workspace.() -> TaskModel.(DataNode<T>) -> DataNode<Any>
+        noinline block: TaskModel.(Context, DataNode<T>) -> DataNode<Any>
     ) {
-        transform(T::class, from, to, transform)
+        transform(T::class, from, to, block)
     }
 
     /**
@@ -120,69 +118,74 @@ class KTaskBuilder(val name: String) {
     inline fun <reified T : Any, reified R : Any> action(
         from: String = "",
         to: String = "",
-        crossinline actionBuilder: Workspace.() -> Action<T, R>
+        crossinline block: Context.() -> Action<T, R>
     ) {
-        transform(from, to) {
-            val res: TaskModel.(DataNode<T>) -> DataNode<Any> = { data: DataNode<T> ->
-                actionBuilder().invoke(data, meta)
-            }
-            res
+        transform(from, to) { context, data: DataNode<T> ->
+            block(context).invoke(data, meta)
         }
     }
 
+    class TaskEnv(val name: Name, val meta: Meta, val context: Context)
+
     inline fun <reified T : Any, reified R : Any> pipeAction(
         from: String = "",
         to: String = "",
-        crossinline block: Workspace.() -> PipeBuilder<T, R>.() -> Unit
+        crossinline block: PipeBuilder<T, R>.(Context) -> Unit
     ) {
         action(from, to) {
+            val context = this
             PipeAction(
                 inputType = T::class,
-                outputType = R::class,
-                block = block()
-            )
+                outputType = R::class
+            ) { block(context) }
         }
     }
 
     inline fun <reified T : Any, reified R : Any> pipe(
         from: String = "",
         to: String = "",
-        crossinline block: Workspace.() -> suspend ActionEnv.(T) -> R
+        crossinline block: suspend TaskEnv.(T) -> R
     ) {
         action(from, to) {
+            val context = this
             PipeAction(
                 inputType = T::class,
                 outputType = R::class
-            ) { result(block()) }
+            ) {
+                result = { data ->
+                    TaskEnv(name, meta, context).block(data)
+                }
+            }
         }
     }
 
-
     inline fun <reified T : Any, reified R : Any> joinAction(
         from: String = "",
         to: String = "",
-        crossinline block: Workspace.() -> JoinGroupBuilder<T, R>.() -> Unit
+        crossinline block: JoinGroupBuilder<T, R>.(Context) -> Unit
     ) {
         action(from, to) {
             JoinAction(
                 inputType = T::class,
-                outputType = R::class,
-                action = block()
-            )
+                outputType = R::class
+            ) { block(this@action) }
         }
     }
 
     inline fun <reified T : Any, reified R : Any> join(
         from: String = "",
         to: String = "",
-        crossinline block: Workspace.() -> suspend ActionEnv.(Map<Name, T>) -> R
+        crossinline block: suspend TaskEnv.(Map<Name, T>) -> R
     ) {
         action(from, to) {
+            val context = this
             JoinAction(
                 inputType = T::class,
                 outputType = R::class,
                 action = {
-                    result(actionMeta[TaskModel.MODEL_TARGET_KEY]?.string ?: "@anonimous", block())
+                    result(actionMeta[TaskModel.MODEL_TARGET_KEY]?.string ?: "@anonimous") { data ->
+                        TaskEnv(name, meta, context).block(data)
+                    }
                 }
             )
         }
@@ -191,21 +194,20 @@ class KTaskBuilder(val name: String) {
     inline fun <reified T : Any, reified R : Any> splitAction(
         from: String = "",
         to: String = "",
-        crossinline block: Workspace.() -> SplitBuilder<T, R>.() -> Unit
+        crossinline block: SplitBuilder<T, R>.(Context) -> Unit
     ) {
         action(from, to) {
             SplitAction(
                 inputType = T::class,
-                outputType = R::class,
-                action = block()
-            )
+                outputType = R::class
+            ) { block(this@action) }
         }
     }
 
     /**
      * Use DSL to create a descriptor for this task
      */
-    fun descriptor(transform: NodeDescriptor.() -> Unit) {
+    fun description(transform: NodeDescriptor.() -> Unit) {
         this.descriptor = NodeDescriptor.build(transform)
     }
 
diff --git a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
index 62b72505..92e3aa29 100644
--- a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/SimpleWorkspaceTest.kt
@@ -18,29 +18,25 @@ class SimpleWorkspaceTest {
             model {
                 allData()
             }
-            pipe<Int, Int> {
-                { data ->
-                    context.logger.info { "Starting square on $data" }
-                    data * data
-                }
+            pipe<Int, Int> { data ->
+                context.logger.info { "Starting square on $data" }
+                data * data
             }
         }
 
-        task("sum"){
+        task("sum") {
             model {
                 dependsOn("square")
             }
-            join<Int,Int> {
-                { data ->
-                    context.logger.info { "Starting sum" }
-                    data.values.sum()
-                }
+            join<Int, Int> { data ->
+                context.logger.info { "Starting sum" }
+                data.values.sum()
             }
         }
     }
 
     @Test
-    fun testWorkspace(){
+    fun testWorkspace() {
         val node = workspace.run("sum")
         val res = node.first()
         assertEquals(328350, res.get())