diff --git a/skainet-compile/skainet-compile-dag/src/commonMain/kotlin/sk/ainet/lang/graph/DefaultExecutionTape.kt b/skainet-compile/skainet-compile-dag/src/commonMain/kotlin/sk/ainet/lang/graph/DefaultExecutionTape.kt
index 806b8ff2..3b2bbfb2 100644
--- a/skainet-compile/skainet-compile-dag/src/commonMain/kotlin/sk/ainet/lang/graph/DefaultExecutionTape.kt
+++ b/skainet-compile/skainet-compile-dag/src/commonMain/kotlin/sk/ainet/lang/graph/DefaultExecutionTape.kt
@@ -74,17 +74,19 @@ public open class DefaultExecutionTape(
             val outputDTypes = (trace.attributes["outputDTypes"] as? List<*>)?.map { it?.toString() }
 
             val inputs = List(trace.inputs.size) { i ->
+                val ref = trace.inputs[i]
                 TensorSpec(
-                    name = trace.inputs[i].id,
-                    shape = inputShapes?.getOrNull(i),
-                    dtype = inputDTypes?.getOrNull(i) ?: "unknown",
+                    name = ref.id,
+                    shape = inputShapes?.getOrNull(i) ?: ref.shape.dimensions.toList(),
+                    dtype = inputDTypes?.getOrNull(i) ?: ref.dtype.name,
                 )
             }
             val outputs = List(trace.outputs.size) { i ->
+                val ref = trace.outputs[i]
                 TensorSpec(
-                    name = trace.outputs[i].id,
-                    shape = outputShapes?.getOrNull(i),
-                    dtype = outputDTypes?.getOrNull(i) ?: "unknown",
+                    name = ref.id,
+                    shape = outputShapes?.getOrNull(i) ?: ref.shape.dimensions.toList(),
+                    dtype = outputDTypes?.getOrNull(i) ?: ref.dtype.name,
                 )
             }
 
diff --git a/skainet-compile/skainet-compile-dag/src/commonTest/kotlin/sk/ainet/compile/grad/DefaultExecutionTapeTest.kt b/skainet-compile/skainet-compile-dag/src/commonTest/kotlin/sk/ainet/compile/grad/DefaultExecutionTapeTest.kt
index d2326f39..8629c3a9 100644
--- a/skainet-compile/skainet-compile-dag/src/commonTest/kotlin/sk/ainet/compile/grad/DefaultExecutionTapeTest.kt
+++ b/skainet-compile/skainet-compile-dag/src/commonTest/kotlin/sk/ainet/compile/grad/DefaultExecutionTapeTest.kt
@@ -14,6 +14,8 @@ import sk.ainet.lang.tensor.*
 import sk.ainet.lang.tensor.data.FloatArrayTensorData
 import sk.ainet.lang.graph.DefaultExecutionTape
 import sk.ainet.lang.tensor.ops.AddOperation
+import sk.ainet.lang.trace.OpTrace
+import kotlin.test.assertEquals
 
 class DefaultExecutionTapeTest {
 
@@ -147,4 +149,38 @@ class DefaultExecutionTapeTest {
         assertTrue(prunedTape.operations[0].operation is AddOperation<*, *>)
         assertTrue(prunedTape.operations[1].operation is AddOperation<*, *>)
     }
+
+    @Test
+    fun recordTrace_without_shape_attributes_falls_back_to_tensor_ref_shape() {
+        val trainCtx = createTrainCtx()
+        val input = trainCtx.fromFloatArray<FP32, Float>(Shape(1, 80, 3000), FP32::class, FloatArray(1 * 80 * 3000))
+        val weight = trainCtx.fromFloatArray<FP32, Float>(Shape(384, 80, 3), FP32::class, FloatArray(384 * 80 * 3))
+        val output = trainCtx.fromFloatArray<FP32, Float>(Shape(1, 384, 3000), FP32::class, FloatArray(1 * 384 * 3000))
+
+        val tape = DefaultExecutionTape(trainCtx.session)
+        tape.startRecording()
+        val inputRef = tape.session.refOf(input)
+        val weightRef = tape.session.refOf(weight)
+        val outputRef = tape.session.refOf(output)
+
+        tape.recordTrace(
+            OpTrace(
+                opType = "conv1d",
+                inputs = listOf(inputRef, weightRef),
+                outputs = listOf(outputRef),
+                attributes = mapOf(
+                    "stride" to 1,
+                    "padding" to 1,
+                    "dilation" to 1,
+                    "groups" to 1
+                )
+            )
+        )
+        tape.stopRecording()
+
+        val recorded = tape.operations.single { it.operation.name == "conv1d" }
+        assertEquals(listOf(1, 384, 3000), recorded.outputs.single().shape)
+        assertEquals(listOf(1, 80, 3000), recorded.inputs[0].shape)
+        assertEquals(listOf(384, 80, 3), recorded.inputs[1].shape)
+    }
 }