diff --git a/cmd/notation/internal/display/metadata/tree/inspect.go b/cmd/notation/internal/display/metadata/tree/inspect.go
index c9f58ed23..51aa161e5 100644
--- a/cmd/notation/internal/display/metadata/tree/inspect.go
+++ b/cmd/notation/internal/display/metadata/tree/inspect.go
@@ -29,7 +29,6 @@ import (
 	"github.com/notaryproject/notation-go/registry"
 	"github.com/notaryproject/notation/cmd/notation/internal/display/output"
 	"github.com/notaryproject/notation/internal/envelope"
-	"github.com/notaryproject/notation/internal/tree"
 	"github.com/notaryproject/tspclient-go"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 )
@@ -41,10 +40,10 @@ type InspectHandler struct {
 
 	// rootReferenceNode is the root node with the artifact reference as the
 	// value.
-	rootReferenceNode *tree.Node
+	rootReferenceNode *Node
 	// notationSignaturesNode is the node for all signatures associated with the
 	// artifact.
-	notationSignaturesNode *tree.Node
+	notationSignaturesNode *Node
 }
 
 // NewInspectHandler creates a TreeHandler to inspect signatures and print in tree
@@ -60,7 +59,7 @@ func NewInspectHandler(printer *output.Printer) *InspectHandler {
 //
 // mediaType is a no-op for this handler.
 func (h *InspectHandler) OnReferenceResolved(reference, _ string) {
-	h.rootReferenceNode = tree.New(reference)
+	h.rootReferenceNode = New(reference)
 	h.notationSignaturesNode = h.rootReferenceNode.Add(registry.ArtifactTypeNotation)
 }
 
@@ -78,7 +77,7 @@ func (h *InspectHandler) Render() error {
 	return h.rootReferenceNode.Print(h.printer)
 }
 
-func addSignature(node *tree.Node, digest string, sigEnvelope coresignature.Envelope) error {
+func addSignature(node *Node, digest string, sigEnvelope coresignature.Envelope) error {
 	envelopeContent, err := sigEnvelope.Content()
 	if err != nil {
 		return err
@@ -104,7 +103,7 @@ func addSignature(node *tree.Node, digest string, sigEnvelope coresignature.Enve
 	return nil
 }
 
-func addSignedAttributes(node *tree.Node, envelopeContent *coresignature.EnvelopeContent) {
+func addSignedAttributes(node *Node, envelopeContent *coresignature.EnvelopeContent) {
 	signedAttributesNode := node.Add("signed attributes")
 	signedAttributesNode.AddPair("content type", string(envelopeContent.Payload.ContentType))
 	signedAttributesNode.AddPair("signing scheme", string(envelopeContent.SignerInfo.SignedAttributes.SigningScheme))
@@ -117,7 +116,7 @@ func addSignedAttributes(node *tree.Node, envelopeContent *coresignature.Envelop
 	}
 }
 
-func addUserDefinedAttributes(node *tree.Node, annotations map[string]string) {
+func addUserDefinedAttributes(node *Node, annotations map[string]string) {
 	userDefinedAttributesNode := node.Add("user defined attributes")
 	if len(annotations) == 0 {
 		userDefinedAttributesNode.Add("(empty)")
@@ -129,7 +128,7 @@ func addUserDefinedAttributes(node *tree.Node, annotations map[string]string) {
 	}
 }
 
-func addUnsignedAttributes(node *tree.Node, envelopeContent *coresignature.EnvelopeContent) {
+func addUnsignedAttributes(node *Node, envelopeContent *coresignature.EnvelopeContent) {
 	unsignedAttributesNode := node.Add("unsigned attributes")
 	if signingAgent := envelopeContent.SignerInfo.UnsignedAttributes.SigningAgent; signingAgent != "" {
 		unsignedAttributesNode.AddPair("signing agent", signingAgent)
@@ -139,14 +138,14 @@ func addUnsignedAttributes(node *tree.Node, envelopeContent *coresignature.Envel
 	}
 }
 
-func addSignedArtifact(node *tree.Node, signedArtifactDesc ocispec.Descriptor) {
+func addSignedArtifact(node *Node, signedArtifactDesc ocispec.Descriptor) {
 	artifactNode := node.Add("signed artifact")
 	artifactNode.AddPair("media type", signedArtifactDesc.MediaType)
 	artifactNode.AddPair("digest", signedArtifactDesc.Digest.String())
 	artifactNode.AddPair("size", strconv.FormatInt(signedArtifactDesc.Size, 10))
 }
 
-func addTimestamp(node *tree.Node, signerInfo coresignature.SignerInfo) {
+func addTimestamp(node *Node, signerInfo coresignature.SignerInfo) {
 	timestampNode := node.Add("timestamp signature")
 	signedToken, err := tspclient.ParseSignedToken(signerInfo.UnsignedAttributes.TimestampSignature)
 	if err != nil {
@@ -167,7 +166,7 @@ func addTimestamp(node *tree.Node, signerInfo coresignature.SignerInfo) {
 	addCertificates(timestampNode, signedToken.Certificates)
 }
 
-func addCertificates(node *tree.Node, certChain []*x509.Certificate) {
+func addCertificates(node *Node, certChain []*x509.Certificate) {
 	certListNode := node.Add("certificates")
 	for _, cert := range certChain {
 		hash := sha256.Sum256(cert.Raw)
diff --git a/cmd/notation/internal/display/metadata/tree/inspect_test.go b/cmd/notation/internal/display/metadata/tree/inspect_test.go
index 6a5eddeca..3900c9595 100644
--- a/cmd/notation/internal/display/metadata/tree/inspect_test.go
+++ b/cmd/notation/internal/display/metadata/tree/inspect_test.go
@@ -20,19 +20,18 @@ import (
 	"time"
 
 	coresignature "github.com/notaryproject/notation-core-go/signature"
-	"github.com/notaryproject/notation/internal/tree"
 )
 
 func TestAddSignedAttributes(t *testing.T) {
 	t.Run("empty envelopeContent", func(t *testing.T) {
-		node := tree.New("root")
+		node := New("root")
 		ec := &coresignature.EnvelopeContent{}
 		addSignedAttributes(node, ec)
 		// No error or panic expected; minimal check or just ensure it doesn't crash.
 	})
 
 	t.Run("with expiry and extented node", func(t *testing.T) {
-		node := tree.New("root")
+		node := New("root")
 		expiryTime := time.Now().Add(time.Hour)
 		ec := &coresignature.EnvelopeContent{
 			Payload: coresignature.Payload{
@@ -77,7 +76,7 @@ func TestAddSignedAttributes(t *testing.T) {
 
 func TestAddUserDefinedAttributes(t *testing.T) {
 	t.Run("empty map", func(t *testing.T) {
-		node := tree.New("root")
+		node := New("root")
 		addUserDefinedAttributes(node, nil)
 		if len(node.Children) == 0 {
 			t.Fatal("expected node to have children")
@@ -92,7 +91,7 @@ func TestAddUserDefinedAttributes(t *testing.T) {
 	})
 
 	t.Run("non-empty map", func(t *testing.T) {
-		node := tree.New("root")
+		node := New("root")
 		annotations := map[string]string{"key1": "val1", "key2": "val2"}
 		addUserDefinedAttributes(node, annotations)
 		udaNode := node.Children[0]
@@ -107,7 +106,7 @@ func TestAddUserDefinedAttributes(t *testing.T) {
 
 func TestAddTimestamp(t *testing.T) {
 	t.Run("invalid timestamp signature", func(t *testing.T) {
-		node := tree.New("root")
+		node := New("root")
 		signerInfo := coresignature.SignerInfo{
 			UnsignedAttributes: coresignature.UnsignedAttributes{
 				TimestampSignature: []byte("invalid"),
@@ -141,7 +140,7 @@ func TestAddTimestamp(t *testing.T) {
 				TimestampSignature: tsaToken,
 			},
 		}
-		node := tree.New("root")
+		node := New("root")
 		addTimestamp(node, signerInfo)
 		if len(node.Children) == 0 {
 			t.Fatal("expected node to have children")
diff --git a/internal/tree/tree.go b/cmd/notation/internal/display/metadata/tree/tree.go
similarity index 100%
rename from internal/tree/tree.go
rename to cmd/notation/internal/display/metadata/tree/tree.go
diff --git a/internal/tree/tree_test.go b/cmd/notation/internal/display/metadata/tree/tree_test.go
similarity index 100%
rename from internal/tree/tree_test.go
rename to cmd/notation/internal/display/metadata/tree/tree_test.go