diff --git a/commonspace/objectsync/objectsync.go b/commonspace/objectsync/objectsync.go
index f4dc7c1b..386cbb15 100644
--- a/commonspace/objectsync/objectsync.go
+++ b/commonspace/objectsync/objectsync.go
@@ -31,7 +31,7 @@ var log = logger.NewNamed(CName)
 type ObjectSync interface {
 	LastUsage() time.Time
 	HandleMessage(ctx context.Context, hm HandleMessage) (err error)
-	HandleRequest(ctx context.Context, hm HandleMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
+	HandleRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
 	CloseThread(id string) (err error)
 	app.ComponentRunnable
 }
@@ -103,10 +103,12 @@ func (s *objectSync) LastUsage() time.Time {
 	return time.Time{}
 }
 
-func (s *objectSync) HandleRequest(ctx context.Context, hm HandleMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
-	hm.ReceiveTime = time.Now()
-	hm.StartHandlingTime = hm.ReceiveTime
-	return s.handleRequest(ctx, hm.SenderId, hm.Message)
+func (s *objectSync) HandleRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
+	peerId, err := peer.CtxPeerId(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return s.handleRequest(ctx, peerId, req)
 }
 
 func (s *objectSync) HandleMessage(ctx context.Context, hm HandleMessage) (err error) {
diff --git a/commonspace/requestmanager/requestmanager.go b/commonspace/requestmanager/requestmanager.go
index 18eeff45..f28ae3ef 100644
--- a/commonspace/requestmanager/requestmanager.go
+++ b/commonspace/requestmanager/requestmanager.go
@@ -73,6 +73,7 @@ func (r *requestManager) Close(ctx context.Context) (err error) {
 }
 
 func (r *requestManager) SendRequest(ctx context.Context, peerId string, req *spacesyncproto.ObjectSyncMessage) (reply *spacesyncproto.ObjectSyncMessage, err error) {
+	// TODO: limit concurrent sends?
 	return r.doRequest(ctx, peerId, req)
 }
 
diff --git a/commonspace/space.go b/commonspace/space.go
index 32b1b04d..9fd25449 100644
--- a/commonspace/space.go
+++ b/commonspace/space.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"github.com/anyproto/any-sync/app"
 	"github.com/anyproto/any-sync/commonspace/headsync"
+	"github.com/anyproto/any-sync/commonspace/object/acl/list"
+	"github.com/anyproto/any-sync/commonspace/object/acl/syncacl"
 	"github.com/anyproto/any-sync/commonspace/object/tree/treechangeproto"
 	"github.com/anyproto/any-sync/commonspace/objectsync"
 	"github.com/anyproto/any-sync/commonspace/objecttreebuilder"
@@ -58,6 +60,8 @@ type Space interface {
 	Id() string
 	Init(ctx context.Context) error
 
+	Description() (desc SpaceDescription, err error)
+
 	TreeBuilder() objecttreebuilder.TreeBuilder
 	SyncStatus() syncstatus.StatusUpdater
 	Storage() spacestorage.SpaceStorage
@@ -67,7 +71,8 @@ type Space interface {
 	DeleteSpace(ctx context.Context, deleteChange *treechangeproto.RawTreeChangeWithId) (err error)
 
 	HandleMessage(ctx context.Context, msg objectsync.HandleMessage) (err error)
-	HandleRequest(ctx context.Context, msg objectsync.HandleMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
+	HandleSyncRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error)
+	HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error)
 
 	TryClose(objectTTL time.Duration) (close bool, err error)
 	Close() error
@@ -86,6 +91,28 @@ type space struct {
 	syncStatus  syncstatus.StatusProvider
 	settings    settings.Settings
 	storage     spacestorage.SpaceStorage
+	aclList     list.AclList
+}
+
+func (s *space) Description() (desc SpaceDescription, err error) {
+	root := s.aclList.Root()
+	settingsStorage, err := s.storage.TreeStorage(s.storage.SpaceSettingsId())
+	if err != nil {
+		return
+	}
+	settingsRoot, err := settingsStorage.Root()
+	if err != nil {
+		return
+	}
+
+	desc = SpaceDescription{
+		SpaceHeader:          s.header,
+		AclId:                root.Id,
+		AclPayload:           root.Payload,
+		SpaceSettingsId:      settingsRoot.Id,
+		SpaceSettingsPayload: settingsRoot.RawChange,
+	}
+	return
 }
 
 func (s *space) DeleteTree(ctx context.Context, id string) (err error) {
@@ -104,8 +131,12 @@ func (s *space) HandleMessage(ctx context.Context, msg objectsync.HandleMessage)
 	return s.objectSync.HandleMessage(ctx, msg)
 }
 
-func (s *space) HandleRequest(ctx context.Context, msg objectsync.HandleMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
-	return s.objectSync.HandleRequest(ctx, msg)
+func (s *space) HandleSyncRequest(ctx context.Context, req *spacesyncproto.ObjectSyncMessage) (resp *spacesyncproto.ObjectSyncMessage, err error) {
+	return s.objectSync.HandleRequest(ctx, req)
+}
+
+func (s *space) HandleRangeRequest(ctx context.Context, req *spacesyncproto.HeadSyncRequest) (resp *spacesyncproto.HeadSyncResponse, err error) {
+	return s.headSync.HandleRangeRequest(ctx, req)
 }
 
 func (s *space) TreeBuilder() objecttreebuilder.TreeBuilder {
@@ -127,6 +158,7 @@ func (s *space) Init(ctx context.Context) (err error) {
 	s.settings = s.app.MustComponent(settings.CName).(settings.Settings)
 	s.objectSync = s.app.MustComponent(objectsync.CName).(objectsync.ObjectSync)
 	s.storage = s.app.MustComponent(spacestorage.CName).(spacestorage.SpaceStorage)
+	s.aclList = s.app.MustComponent(syncacl.CName).(list.AclList)
 	return nil
 }