diff --git a/cmd/stress/storable.go b/cmd/stress/storable.go
index fcd57b6..c5676a1 100644
--- a/cmd/stress/storable.go
+++ b/cmd/stress/storable.go
@@ -32,12 +32,63 @@ import (
 // This file contains value implementations for testing purposes.
 
 const (
+	reservedMinTagNum                 = 161
+	reservedMinTagNumForContainerType = 230
+	reservedMaxTagNum                 = 239
+)
+
+const (
+	// CBOR tag numbers used to encode elements.
+
 	cborTagUInt8Value  = 161
 	cborTagUInt16Value = 162
 	cborTagUInt32Value = 163
 	cborTagUInt64Value = 164
+
+	// CBOR tag numbers in this block cannot exceed 230 (reservedMinTagNumForContainerType).
+)
+
+const (
+	// CBOR tag numbers used to encode container types.
+	// Replace _ when new tag number is needed (use lower tag numbers first).
+
+	arrayTypeTagNum = reservedMinTagNumForContainerType + iota
+	compositeTypeTagNum
+	mapTypeTagNum
+	_
+	_
+	_
+	_
+	_
+	_
+	_
 )
 
+func init() {
+	// Check if the CBOR tag number range is reserved for internal use by atree.
+	// Smoke tests must only use available (unreserved by atree) CBOR tag numbers
+	// to encode elements in atree managed containers.
+
+	// As of Aug 15, 2024:
+	// - Atree reserves CBOR tag numbers [240, 255] for atree internal use.
+	// - Smoke tests reserve CBOR tag numbers [161, 239] to encode elements.
+
+	tagNumOK, err := atree.IsCBORTagNumberRangeAvailable(reservedMinTagNum, reservedMaxTagNum)
+	if err != nil {
+		panic(err)
+	}
+
+	if !tagNumOK {
+		atreeMinTagNum, atreeMaxTagNum := atree.ReservedCBORTagNumberRange()
+		panic(fmt.Errorf(
+			"smoke test tag numbers [%d, %d] overlaps with atree internal tag numbers [%d, %d]",
+			reservedMinTagNum,
+			reservedMaxTagNum,
+			atreeMinTagNum,
+			atreeMaxTagNum))
+	}
+}
+
 type Uint8Value uint8
 
 var _ atree.Value = Uint8Value(0)
diff --git a/cmd/stress/typeinfo.go b/cmd/stress/typeinfo.go
index b3c8120..fcde9e3 100644
--- a/cmd/stress/typeinfo.go
+++ b/cmd/stress/typeinfo.go
@@ -29,10 +29,6 @@ import (
 const (
 	maxArrayTypeValue = 10
 	maxMapTypeValue   = 10
-
-	arrayTypeTagNum     = 246
-	mapTypeTagNum       = 245
-	compositeTypeTagNum = 244
 )
 
 type arrayTypeInfo struct {
@@ -53,10 +49,6 @@ func (i arrayTypeInfo) IsComposite() bool {
 	return false
 }
 
-func (i arrayTypeInfo) Identifier() string {
-	return fmt.Sprintf("array(%d)", i)
-}
-
 func (i arrayTypeInfo) Encode(e *cbor.StreamEncoder) error {
 	err := e.EncodeTagHead(arrayTypeTagNum)
 	if err != nil {
@@ -88,10 +80,6 @@ func (i mapTypeInfo) IsComposite() bool {
 	return false
 }
 
-func (i mapTypeInfo) Identifier() string {
-	return fmt.Sprintf("map(%d)", i)
-}
-
 func (i mapTypeInfo) Encode(e *cbor.StreamEncoder) error {
 	err := e.EncodeTagHead(mapTypeTagNum)
 	if err != nil {
@@ -153,10 +141,6 @@ func (i compositeTypeInfo) IsComposite() bool {
 	return true
 }
 
-func (i compositeTypeInfo) Identifier() string {
-	return fmt.Sprintf("composite(%d_%d)", i.fieldStartIndex, i.fieldEndIndex)
-}
-
 func (i compositeTypeInfo) Encode(e *cbor.StreamEncoder) error {
 	err := e.EncodeTagHead(compositeTypeTagNum)
 	if err != nil {