diff --git a/monitor/commands/attach.go b/monitor/commands/attach.go
index 959a1502..2de39e5f 100644
--- a/monitor/commands/attach.go
+++ b/monitor/commands/attach.go
@@ -58,7 +58,7 @@ func (cm *AttachCmd) Exec(ctx context.Context, args []string) error {
 }
 
 func isProcessID(ctx context.Context, c types.Monitor, ref string) (bool, error) {
-	infos, err := c.ListProcesses(ctx)
+	infos, err := c.ListProcesses(ctx, c.AttachedSessionID())
 	if err != nil {
 		return false, err
 	}
diff --git a/monitor/commands/disconnect.go b/monitor/commands/disconnect.go
index ce94f46f..582852b3 100644
--- a/monitor/commands/disconnect.go
+++ b/monitor/commands/disconnect.go
@@ -26,7 +26,7 @@ func (cm *DisconnectCmd) Exec(ctx context.Context, args []string) error {
 	}
 	isProcess, err := isProcessID(ctx, cm.m, target)
 	if err == nil && isProcess {
-		if err := cm.m.DisconnectProcess(ctx, target); err != nil {
+		if err := cm.m.DisconnectProcess(ctx, cm.m.AttachedSessionID(), target); err != nil {
 			return errors.Errorf("disconnecting from process failed %v", target)
 		}
 		return nil
diff --git a/monitor/commands/ps.go b/monitor/commands/ps.go
index 84808f99..39c2f2cc 100644
--- a/monitor/commands/ps.go
+++ b/monitor/commands/ps.go
@@ -23,7 +23,8 @@ func (cm *PsCmd) Info() types.CommandInfo {
 }
 
 func (cm *PsCmd) Exec(ctx context.Context, args []string) error {
-	plist, err := cm.m.ListProcesses(ctx)
+	ref := cm.m.AttachedSessionID()
+	plist, err := cm.m.ListProcesses(ctx, ref)
 	if err != nil {
 		return err
 	}
diff --git a/monitor/commands/reload.go b/monitor/commands/reload.go
index 77764125..11dd4589 100644
--- a/monitor/commands/reload.go
+++ b/monitor/commands/reload.go
@@ -32,9 +32,9 @@ func (cm *ReloadCmd) Info() types.CommandInfo {
 
 func (cm *ReloadCmd) Exec(ctx context.Context, args []string) error {
 	var bo *controllerapi.BuildOptions
-	if cm.m.AttachedSessionID() != "" {
+	if ref := cm.m.AttachedSessionID(); ref != "" {
 		// Rebuilding an existing session; Restore the build option used for building this session.
-		res, err := cm.m.Inspect(ctx)
+		res, err := cm.m.Inspect(ctx, ref)
 		if err != nil {
 			fmt.Printf("failed to inspect the current build session: %v\n", err)
 		} else {
@@ -46,8 +46,8 @@ func (cm *ReloadCmd) Exec(ctx context.Context, args []string) error {
 	if bo == nil {
 		return errors.Errorf("no build option is provided")
 	}
-	if cm.m.AttachedSessionID() != "" {
-		if err := cm.m.Disconnect(ctx); err != nil {
+	if ref := cm.m.AttachedSessionID(); ref != "" {
+		if err := cm.m.Disconnect(ctx, ref); err != nil {
 			fmt.Println("disconnect error", err)
 		}
 	}
diff --git a/monitor/monitor.go b/monitor/monitor.go
index 2e00c8b4..78666e0e 100644
--- a/monitor/monitor.go
+++ b/monitor/monitor.go
@@ -17,7 +17,6 @@ import (
 	"github.com/docker/buildx/util/ioset"
 	"github.com/docker/buildx/util/progress"
 	"github.com/google/shlex"
-	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/identity"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -63,8 +62,8 @@ func RunMonitor(ctx context.Context, curRef string, options *controllerapi.Build
 	invokeForwarder := ioset.NewForwarder()
 	invokeForwarder.SetIn(&containerIn)
 	m := &monitor{
-		controllerRef: newControllerRef(c, curRef),
-		invokeIO:      invokeForwarder,
+		BuildxController: c,
+		invokeIO:         invokeForwarder,
 		muxIO: ioset.NewMuxIO(ioset.In{
 			Stdin:  io.NopCloser(stdin),
 			Stdout: nopCloser{stdout},
@@ -77,6 +76,7 @@ func RunMonitor(ctx context.Context, curRef string, options *controllerapi.Build
 			return "Switched IO\n"
 		}),
 	}
+	m.ref.Store(curRef)
 
 	// Start container automatically
 	fmt.Fprintf(stdout, "Launching interactive container. Press Ctrl-a-c to switch to monitor console\n")
@@ -203,7 +203,8 @@ type readWriter struct {
 }
 
 type monitor struct {
-	*controllerRef
+	control.BuildxController
+	ref atomic.Value
 
 	muxIO        *ioset.MuxIO
 	invokeIO     *ioset.Forwarder
@@ -212,15 +213,15 @@ type monitor struct {
 }
 
 func (m *monitor) DisconnectSession(ctx context.Context, targetID string) error {
-	return m.controllerRef.raw().Disconnect(ctx, targetID)
+	return m.Disconnect(ctx, targetID)
 }
 
 func (m *monitor) AttachSession(ref string) {
-	m.controllerRef.ref.Store(ref)
+	m.ref.Store(ref)
 }
 
 func (m *monitor) AttachedSessionID() string {
-	return m.controllerRef.ref.Load().(string)
+	return m.ref.Load().(string)
 }
 
 func (m *monitor) Rollback(ctx context.Context, cfg controllerapi.InvokeConfig) string {
@@ -298,87 +299,12 @@ func (m *monitor) invoke(ctx context.Context, pid string, cfg controllerapi.Invo
 	defer invokeCancelAndDetachFn()
 	m.invokeCancel = invokeCancelAndDetachFn
 
-	err := m.controllerRef.invoke(invokeCtx, pid, cfg, containerIn.Stdin, containerIn.Stdout, containerIn.Stderr)
+	err := m.Invoke(invokeCtx, m.AttachedSessionID(), pid, cfg, containerIn.Stdin, containerIn.Stdout, containerIn.Stderr)
 	close(waitInvokeDoneCh)
 
 	return err
 }
 
-func newControllerRef(c control.BuildxController, ref string) *controllerRef {
-	cr := &controllerRef{c: c}
-	cr.ref.Store(ref)
-	return cr
-}
-
-type controllerRef struct {
-	c   control.BuildxController
-	ref atomic.Value
-}
-
-func (c *controllerRef) raw() control.BuildxController {
-	return c.c
-}
-
-func (c *controllerRef) getRef() (string, error) {
-	ref := c.ref.Load()
-	if ref == "" {
-		return "", errors.Errorf("client is not attached to a session")
-	}
-	return ref.(string), nil
-}
-
-func (c *controllerRef) Build(ctx context.Context, options controllerapi.BuildOptions, in io.ReadCloser, progress progress.Writer) (ref string, resp *client.SolveResponse, err error) {
-	return c.c.Build(ctx, options, in, progress)
-}
-
-func (c *controllerRef) invoke(ctx context.Context, pid string, options controllerapi.InvokeConfig, ioIn io.ReadCloser, ioOut io.WriteCloser, ioErr io.WriteCloser) error {
-	ref, err := c.getRef()
-	if err != nil {
-		return err
-	}
-	return c.c.Invoke(ctx, ref, pid, options, ioIn, ioOut, ioErr)
-}
-
-func (c *controllerRef) Kill(ctx context.Context) error {
-	return c.c.Kill(ctx)
-}
-
-func (c *controllerRef) List(ctx context.Context) (refs []string, _ error) {
-	return c.c.List(ctx)
-}
-
-func (c *controllerRef) ListProcesses(ctx context.Context) (infos []*controllerapi.ProcessInfo, retErr error) {
-	ref, err := c.getRef()
-	if err != nil {
-		return nil, err
-	}
-	return c.c.ListProcesses(ctx, ref)
-}
-
-func (c *controllerRef) DisconnectProcess(ctx context.Context, pid string) error {
-	ref, err := c.getRef()
-	if err != nil {
-		return err
-	}
-	return c.c.DisconnectProcess(ctx, ref, pid)
-}
-
-func (c *controllerRef) Inspect(ctx context.Context) (*controllerapi.InspectResponse, error) {
-	ref, err := c.getRef()
-	if err != nil {
-		return nil, err
-	}
-	return c.c.Inspect(ctx, ref)
-}
-
-func (c *controllerRef) Disconnect(ctx context.Context) error {
-	ref, err := c.getRef()
-	if err != nil {
-		return err
-	}
-	return c.c.Disconnect(ctx, ref)
-}
-
 type nopCloser struct {
 	io.Writer
 }
diff --git a/monitor/types/types.go b/monitor/types/types.go
index 60d92459..9efbcc15 100644
--- a/monitor/types/types.go
+++ b/monitor/types/types.go
@@ -2,15 +2,15 @@ package types
 
 import (
 	"context"
-	"io"
 
+	"github.com/docker/buildx/controller/control"
 	controllerapi "github.com/docker/buildx/controller/pb"
-	"github.com/docker/buildx/util/progress"
-	"github.com/moby/buildkit/client"
 )
 
 // Monitor provides APIs for attaching and controlling the buildx server.
 type Monitor interface {
+	control.BuildxController
+
 	// Rollback re-runs the interactive container with initial rootfs contents.
 	Rollback(ctx context.Context, cfg controllerapi.InvokeConfig) string
 
@@ -34,27 +34,6 @@ type Monitor interface {
 
 	// AttachedSessionID returns the ID of the attached session.
 	AttachedSessionID() string
-
-	// Build executes the specified build and returns an ID of the session for debugging that build.
-	Build(ctx context.Context, options controllerapi.BuildOptions, in io.ReadCloser, progress progress.Writer) (ref string, resp *client.SolveResponse, err error)
-
-	// Kill kills the buildx server.
-	Kill(ctx context.Context) error
-
-	// List lists sessions.
-	List(ctx context.Context) (refs []string, _ error)
-
-	// ListPrcesses lists processes in the attached session.
-	ListProcesses(ctx context.Context) (infos []*controllerapi.ProcessInfo, retErr error)
-
-	// DisconnectProcess finishes the specified process.
-	DisconnectProcess(ctx context.Context, pid string) error
-
-	// Inspect returns information about the attached build.
-	Inspect(ctx context.Context) (*controllerapi.InspectResponse, error)
-
-	// Disconnect finishes the attached session.
-	Disconnect(ctx context.Context) error
 }
 
 // CommandInfo is information about a command.