diff --git a/adapter/inbound.go b/adapter/inbound.go
index ffc4c564..82909d01 100644
--- a/adapter/inbound.go
+++ b/adapter/inbound.go
@@ -91,15 +91,6 @@ func ContextFrom(ctx context.Context) *InboundContext {
 	return metadata.(*InboundContext)
 }
 
-func AppendContext(ctx context.Context) (context.Context, *InboundContext) {
-	metadata := ContextFrom(ctx)
-	if metadata != nil {
-		return ctx, metadata
-	}
-	metadata = new(InboundContext)
-	return WithContext(ctx, metadata), metadata
-}
-
 func ExtendContext(ctx context.Context) (context.Context, *InboundContext) {
 	var newMetadata InboundContext
 	if metadata := ContextFrom(ctx); metadata != nil {
diff --git a/outbound/builder.go b/outbound/builder.go
index e4d6a80e..b99b49b7 100644
--- a/outbound/builder.go
+++ b/outbound/builder.go
@@ -11,11 +11,6 @@ import (
 )
 
 func New(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.Outbound) (adapter.Outbound, error) {
-	var metadata *adapter.InboundContext
-	if tag != "" {
-		ctx, metadata = adapter.AppendContext(ctx)
-		metadata.Outbound = tag
-	}
 	if options.Type == "" {
 		return nil, E.New("missing outbound type")
 	}
diff --git a/outbound/direct.go b/outbound/direct.go
index 11f650e4..c873941c 100644
--- a/outbound/direct.go
+++ b/outbound/direct.go
@@ -70,7 +70,7 @@ func NewDirect(router adapter.Router, logger log.ContextLogger, tag string, opti
 }
 
 func (h *Direct) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	switch h.overrideOption {
@@ -98,7 +98,7 @@ func (h *Direct) DialContext(ctx context.Context, network string, destination M.
 }
 
 func (h *Direct) DialParallel(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	switch h.overrideOption {
diff --git a/outbound/http.go b/outbound/http.go
index cfc03216..cbcbce07 100644
--- a/outbound/http.go
+++ b/outbound/http.go
@@ -54,7 +54,7 @@ func NewHTTP(ctx context.Context, router adapter.Router, logger log.ContextLogge
 }
 
 func (h *HTTP) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	h.logger.InfoContext(ctx, "outbound connection to ", destination)
diff --git a/outbound/shadowsocks.go b/outbound/shadowsocks.go
index addb6e57..9f8c1cbd 100644
--- a/outbound/shadowsocks.go
+++ b/outbound/shadowsocks.go
@@ -79,7 +79,7 @@ func NewShadowsocks(ctx context.Context, router adapter.Router, logger log.Conte
 }
 
 func (h *Shadowsocks) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	if h.multiplexDialer == nil {
@@ -107,7 +107,7 @@ func (h *Shadowsocks) DialContext(ctx context.Context, network string, destinati
 }
 
 func (h *Shadowsocks) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	if h.multiplexDialer == nil {
@@ -149,7 +149,7 @@ var _ N.Dialer = (*shadowsocksDialer)(nil)
 type shadowsocksDialer Shadowsocks
 
 func (h *shadowsocksDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	switch N.NetworkName(network) {
@@ -177,7 +177,7 @@ func (h *shadowsocksDialer) DialContext(ctx context.Context, network string, des
 }
 
 func (h *shadowsocksDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	outConn, err := h.dialer.DialContext(ctx, N.NetworkUDP, h.serverAddr)
diff --git a/outbound/shadowtls.go b/outbound/shadowtls.go
index 4427301c..38de8c0b 100644
--- a/outbound/shadowtls.go
+++ b/outbound/shadowtls.go
@@ -92,7 +92,7 @@ func NewShadowTLS(ctx context.Context, router adapter.Router, logger log.Context
 }
 
 func (h *ShadowTLS) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	switch N.NetworkName(network) {
diff --git a/outbound/socks.go b/outbound/socks.go
index 063f7b95..f4757467 100644
--- a/outbound/socks.go
+++ b/outbound/socks.go
@@ -65,7 +65,7 @@ func NewSocks(router adapter.Router, logger log.ContextLogger, tag string, optio
 }
 
 func (h *Socks) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	switch N.NetworkName(network) {
@@ -91,7 +91,7 @@ func (h *Socks) DialContext(ctx context.Context, network string, destination M.S
 }
 
 func (h *Socks) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	if h.uotClient != nil {
diff --git a/outbound/trojan.go b/outbound/trojan.go
index 52d72757..bde251d0 100644
--- a/outbound/trojan.go
+++ b/outbound/trojan.go
@@ -124,7 +124,7 @@ func (h *Trojan) Close() error {
 type trojanDialer Trojan
 
 func (h *trojanDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	var conn net.Conn
diff --git a/outbound/vless.go b/outbound/vless.go
index 66080eaf..a81678f0 100644
--- a/outbound/vless.go
+++ b/outbound/vless.go
@@ -143,7 +143,7 @@ func (h *VLESS) Close() error {
 type vlessDialer VLESS
 
 func (h *vlessDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	var conn net.Conn
@@ -186,7 +186,7 @@ func (h *vlessDialer) DialContext(ctx context.Context, network string, destinati
 
 func (h *vlessDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
 	h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	var conn net.Conn
diff --git a/outbound/vmess.go b/outbound/vmess.go
index c7d88b90..3149729c 100644
--- a/outbound/vmess.go
+++ b/outbound/vmess.go
@@ -157,7 +157,7 @@ func (h *VMess) NewPacketConnection(ctx context.Context, conn N.PacketConn, meta
 type vmessDialer VMess
 
 func (h *vmessDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	var conn net.Conn
@@ -185,7 +185,7 @@ func (h *vmessDialer) DialContext(ctx context.Context, network string, destinati
 }
 
 func (h *vmessDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
-	ctx, metadata := adapter.AppendContext(ctx)
+	ctx, metadata := adapter.ExtendContext(ctx)
 	metadata.Outbound = h.tag
 	metadata.Destination = destination
 	var conn net.Conn