diff --git a/README.md b/README.md
index dcee3b4..2e0c1dc 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/restatedev/sdk-go.svg)](https://pkg.go.dev/github.com/restatedev/sdk-go)
 [![Go](https://github.com/restatedev/sdk-go/actions/workflows/test.yaml/badge.svg)](https://github.com/restatedev/sdk-go/actions/workflows/test.yaml)
 
-> This only works with Restate version 0.8
-
 # Restate Go SDK
 
 [Restate](https://restate.dev/) is a system for easily building resilient applications using *distributed durable async/await*. This repository contains the Restate SDK for writing services in **Golang**.
diff --git a/proto/buf.yaml b/buf.yaml
similarity index 64%
rename from proto/buf.yaml
rename to buf.yaml
index 9f6773a..1a51945 100644
--- a/proto/buf.yaml
+++ b/buf.yaml
@@ -1,6 +1,4 @@
 version: v1
-deps:
-  - buf.build/restatedev/proto
 breaking:
   use:
     - FILE
diff --git a/example/user_session.go b/example/user_session.go
index b20a002..a6e465f 100644
--- a/example/user_session.go
+++ b/example/user_session.go
@@ -5,14 +5,14 @@ import (
 	"slices"
 	"time"
 
-	"github.com/restatedev/sdk-go"
+	restate "github.com/restatedev/sdk-go"
 	"github.com/rs/zerolog/log"
 )
 
 func addTicket(ctx restate.Context, userId, ticketId string) (bool, error) {
 
 	var success bool
-	if err := ctx.Service(TicketServiceName).Method("reserve").Do(ticketId, userId, &success); err != nil {
+	if err := ctx.Object(TicketServiceName, ticketId).Method("reserve").Do(userId, &success); err != nil {
 		return false, err
 	}
 
@@ -33,7 +33,7 @@ func addTicket(ctx restate.Context, userId, ticketId string) (bool, error) {
 		return false, err
 	}
 
-	if err := ctx.Service(UserSessionServiceName).Method("expireTicket").Send(userId, ticketId, 15*time.Minute); err != nil {
+	if err := ctx.Object(UserSessionServiceName, ticketId).Method("expireTicket").Send(ticketId, 15*time.Minute); err != nil {
 		return false, err
 	}
 
@@ -62,7 +62,7 @@ func expireTicket(ctx restate.Context, _, ticketId string) (void restate.Void, e
 		return void, err
 	}
 
-	return void, ctx.Service(TicketServiceName).Method("unreserve").Send(ticketId, nil, 0)
+	return void, ctx.Object(TicketServiceName, ticketId).Method("unreserve").Send(nil, 0)
 }
 
 func checkout(ctx restate.Context, userId string, _ restate.Void) (bool, error) {
@@ -78,17 +78,17 @@ func checkout(ctx restate.Context, userId string, _ restate.Void) (bool, error)
 	}
 
 	var response PaymentResponse
-	if err := ctx.Service(CheckoutServiceName).
+	if err := ctx.Object(CheckoutServiceName, "").
 		Method("checkout").
-		Do("", PaymentRequest{UserID: userId, Tickets: tickets}, &response); err != nil {
+		Do(PaymentRequest{UserID: userId, Tickets: tickets}, &response); err != nil {
 		return false, err
 	}
 
 	log.Info().Str("id", response.ID).Int("price", response.Price).Msg("payment details")
 
-	call := ctx.Service(TicketServiceName).Method("markAsSold")
 	for _, ticket := range tickets {
-		if err := call.Send(ticket, nil, 0); err != nil {
+		call := ctx.Object(ticket, TicketServiceName).Method("markAsSold")
+		if err := call.Send(nil, 0); err != nil {
 			return false, err
 		}
 	}
diff --git a/generated/proto/discovery/discovery.pb.go b/generated/proto/discovery/discovery.pb.go
index 78c496a..ffcf939 100644
--- a/generated/proto/discovery/discovery.pb.go
+++ b/generated/proto/discovery/discovery.pb.go
@@ -1,16 +1,15 @@
+// Copyright (c) 2024 - Restate Software, Inc., Restate GmbH
 //
-// Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
-//
-// This file is part of the Restate SDK for Node.js/TypeScript,
-// which is released under the MIT license.
+// This file is part of the Restate service protocol, which is
+// released under the MIT license.
 //
 // You can find a copy of the license in file LICENSE in the root
 // directory of this repository or package, or at
-// https://github.com/restatedev/sdk-typescript/blob/main/LICENSE
+// https://github.com/restatedev/service-protocol/blob/main/LICENSE
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.26.0
 // 	protoc        (unknown)
 // source: proto/discovery/discovery.proto
 
@@ -19,7 +18,6 @@ package discovery
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	descriptorpb "google.golang.org/protobuf/types/descriptorpb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -31,176 +29,54 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-type ProtocolMode int32
+// Service discovery protocol version.
+type ServiceDiscoveryProtocolVersion int32
 
 const (
-	// protolint:disable:next ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
-	ProtocolMode_BIDI_STREAM      ProtocolMode = 0
-	ProtocolMode_REQUEST_RESPONSE ProtocolMode = 1
+	ServiceDiscoveryProtocolVersion_SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED ServiceDiscoveryProtocolVersion = 0
+	// initial service discovery protocol version using endpoint_manifest_schema.json
+	ServiceDiscoveryProtocolVersion_V1 ServiceDiscoveryProtocolVersion = 1
 )
 
-// Enum value maps for ProtocolMode.
+// Enum value maps for ServiceDiscoveryProtocolVersion.
 var (
-	ProtocolMode_name = map[int32]string{
-		0: "BIDI_STREAM",
-		1: "REQUEST_RESPONSE",
+	ServiceDiscoveryProtocolVersion_name = map[int32]string{
+		0: "SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED",
+		1: "V1",
 	}
-	ProtocolMode_value = map[string]int32{
-		"BIDI_STREAM":      0,
-		"REQUEST_RESPONSE": 1,
+	ServiceDiscoveryProtocolVersion_value = map[string]int32{
+		"SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED": 0,
+		"V1": 1,
 	}
 )
 
-func (x ProtocolMode) Enum() *ProtocolMode {
-	p := new(ProtocolMode)
+func (x ServiceDiscoveryProtocolVersion) Enum() *ServiceDiscoveryProtocolVersion {
+	p := new(ServiceDiscoveryProtocolVersion)
 	*p = x
 	return p
 }
 
-func (x ProtocolMode) String() string {
+func (x ServiceDiscoveryProtocolVersion) String() string {
 	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
 }
 
-func (ProtocolMode) Descriptor() protoreflect.EnumDescriptor {
+func (ServiceDiscoveryProtocolVersion) Descriptor() protoreflect.EnumDescriptor {
 	return file_proto_discovery_discovery_proto_enumTypes[0].Descriptor()
 }
 
-func (ProtocolMode) Type() protoreflect.EnumType {
+func (ServiceDiscoveryProtocolVersion) Type() protoreflect.EnumType {
 	return &file_proto_discovery_discovery_proto_enumTypes[0]
 }
 
-func (x ProtocolMode) Number() protoreflect.EnumNumber {
+func (x ServiceDiscoveryProtocolVersion) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(x)
 }
 
-// Deprecated: Use ProtocolMode.Descriptor instead.
-func (ProtocolMode) EnumDescriptor() ([]byte, []int) {
+// Deprecated: Use ServiceDiscoveryProtocolVersion.Descriptor instead.
+func (ServiceDiscoveryProtocolVersion) EnumDescriptor() ([]byte, []int) {
 	return file_proto_discovery_discovery_proto_rawDescGZIP(), []int{0}
 }
 
-type ServiceDiscoveryRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-}
-
-func (x *ServiceDiscoveryRequest) Reset() {
-	*x = ServiceDiscoveryRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_discovery_discovery_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *ServiceDiscoveryRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*ServiceDiscoveryRequest) ProtoMessage() {}
-
-func (x *ServiceDiscoveryRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_discovery_discovery_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use ServiceDiscoveryRequest.ProtoReflect.Descriptor instead.
-func (*ServiceDiscoveryRequest) Descriptor() ([]byte, []int) {
-	return file_proto_discovery_discovery_proto_rawDescGZIP(), []int{0}
-}
-
-type ServiceDiscoveryResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// List of all proto files used to define the services, including the
-	// dependencies.
-	Files *descriptorpb.FileDescriptorSet `protobuf:"bytes,1,opt,name=files,proto3" json:"files,omitempty"`
-	// List of services to register. This might be a subset of services defined in
-	// files.
-	Services []string `protobuf:"bytes,2,rep,name=services,proto3" json:"services,omitempty"`
-	// Service-protocol version negotiation
-	MinProtocolVersion uint32 `protobuf:"varint,3,opt,name=min_protocol_version,json=minProtocolVersion,proto3" json:"min_protocol_version,omitempty"`
-	MaxProtocolVersion uint32 `protobuf:"varint,4,opt,name=max_protocol_version,json=maxProtocolVersion,proto3" json:"max_protocol_version,omitempty"`
-	// Protocol mode negotiation
-	ProtocolMode ProtocolMode `protobuf:"varint,5,opt,name=protocol_mode,json=protocolMode,proto3,enum=dev.restate.service.discovery.ProtocolMode" json:"protocol_mode,omitempty"`
-}
-
-func (x *ServiceDiscoveryResponse) Reset() {
-	*x = ServiceDiscoveryResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_discovery_discovery_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *ServiceDiscoveryResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*ServiceDiscoveryResponse) ProtoMessage() {}
-
-func (x *ServiceDiscoveryResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_discovery_discovery_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use ServiceDiscoveryResponse.ProtoReflect.Descriptor instead.
-func (*ServiceDiscoveryResponse) Descriptor() ([]byte, []int) {
-	return file_proto_discovery_discovery_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *ServiceDiscoveryResponse) GetFiles() *descriptorpb.FileDescriptorSet {
-	if x != nil {
-		return x.Files
-	}
-	return nil
-}
-
-func (x *ServiceDiscoveryResponse) GetServices() []string {
-	if x != nil {
-		return x.Services
-	}
-	return nil
-}
-
-func (x *ServiceDiscoveryResponse) GetMinProtocolVersion() uint32 {
-	if x != nil {
-		return x.MinProtocolVersion
-	}
-	return 0
-}
-
-func (x *ServiceDiscoveryResponse) GetMaxProtocolVersion() uint32 {
-	if x != nil {
-		return x.MaxProtocolVersion
-	}
-	return 0
-}
-
-func (x *ServiceDiscoveryResponse) GetProtocolMode() ProtocolMode {
-	if x != nil {
-		return x.ProtocolMode
-	}
-	return ProtocolMode_BIDI_STREAM
-}
-
 var File_proto_discovery_discovery_proto protoreflect.FileDescriptor
 
 var file_proto_discovery_discovery_proto_rawDesc = []byte{
@@ -208,50 +84,29 @@ var file_proto_discovery_discovery_proto_rawDesc = []byte{
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 }
 
 var (
@@ -267,21 +122,15 @@ func file_proto_discovery_discovery_proto_rawDescGZIP() []byte {
 }
 
 var file_proto_discovery_discovery_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_proto_discovery_discovery_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_proto_discovery_discovery_proto_goTypes = []interface{}{
-	(ProtocolMode)(0),                      // 0: dev.restate.service.discovery.ProtocolMode
-	(*ServiceDiscoveryRequest)(nil),        // 1: dev.restate.service.discovery.ServiceDiscoveryRequest
-	(*ServiceDiscoveryResponse)(nil),       // 2: dev.restate.service.discovery.ServiceDiscoveryResponse
-	(*descriptorpb.FileDescriptorSet)(nil), // 3: google.protobuf.FileDescriptorSet
+	(ServiceDiscoveryProtocolVersion)(0), // 0: dev.restate.service.discovery.ServiceDiscoveryProtocolVersion
 }
 var file_proto_discovery_discovery_proto_depIdxs = []int32{
-	3, // 0: dev.restate.service.discovery.ServiceDiscoveryResponse.files:type_name -> google.protobuf.FileDescriptorSet
-	0, // 1: dev.restate.service.discovery.ServiceDiscoveryResponse.protocol_mode:type_name -> dev.restate.service.discovery.ProtocolMode
-	2, // [2:2] is the sub-list for method output_type
-	2, // [2:2] is the sub-list for method input_type
-	2, // [2:2] is the sub-list for extension type_name
-	2, // [2:2] is the sub-list for extension extendee
-	0, // [0:2] is the sub-list for field type_name
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
 }
 
 func init() { file_proto_discovery_discovery_proto_init() }
@@ -289,46 +138,19 @@ func file_proto_discovery_discovery_proto_init() {
 	if File_proto_discovery_discovery_proto != nil {
 		return
 	}
-	if !protoimpl.UnsafeEnabled {
-		file_proto_discovery_discovery_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ServiceDiscoveryRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_discovery_discovery_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ServiceDiscoveryResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proto_discovery_discovery_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   2,
+			NumMessages:   0,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_proto_discovery_discovery_proto_goTypes,
 		DependencyIndexes: file_proto_discovery_discovery_proto_depIdxs,
 		EnumInfos:         file_proto_discovery_discovery_proto_enumTypes,
-		MessageInfos:      file_proto_discovery_discovery_proto_msgTypes,
 	}.Build()
 	File_proto_discovery_discovery_proto = out.File
 	file_proto_discovery_discovery_proto_rawDesc = nil
diff --git a/generated/proto/dynrpc/dynrpc.pb.go b/generated/proto/dynrpc/dynrpc.pb.go
deleted file mode 100644
index 5c4a4f6..0000000
--- a/generated/proto/dynrpc/dynrpc.pb.go
+++ /dev/null
@@ -1,362 +0,0 @@
-//
-// Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
-//
-// This file is part of the Restate SDK for Node.js/TypeScript,
-// which is released under the MIT license.
-//
-// You can find a copy of the license in file LICENSE in the root
-// directory of this repository or package, or at
-// https://github.com/restatedev/sdk-typescript/blob/main/LICENSE
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        (unknown)
-// source: proto/dynrpc/dynrpc.proto
-
-package dynrpc
-
-import (
-	_ "github.com/restatedev/sdk-go/generated/dev/restate"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	emptypb "google.golang.org/protobuf/types/known/emptypb"
-	structpb "google.golang.org/protobuf/types/known/structpb"
-	reflect "reflect"
-	sync "sync"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-type KeyedEvent struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Key        string            `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
-	Payload    []byte            `protobuf:"bytes,3,opt,name=payload,proto3" json:"payload,omitempty"`
-	Attributes map[string]string `protobuf:"bytes,15,rep,name=attributes,proto3" json:"attributes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-}
-
-func (x *KeyedEvent) Reset() {
-	*x = KeyedEvent{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *KeyedEvent) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*KeyedEvent) ProtoMessage() {}
-
-func (x *KeyedEvent) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use KeyedEvent.ProtoReflect.Descriptor instead.
-func (*KeyedEvent) Descriptor() ([]byte, []int) {
-	return file_proto_dynrpc_dynrpc_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *KeyedEvent) GetKey() string {
-	if x != nil {
-		return x.Key
-	}
-	return ""
-}
-
-func (x *KeyedEvent) GetPayload() []byte {
-	if x != nil {
-		return x.Payload
-	}
-	return nil
-}
-
-func (x *KeyedEvent) GetAttributes() map[string]string {
-	if x != nil {
-		return x.Attributes
-	}
-	return nil
-}
-
-type RpcRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Key     string          `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
-	Request *structpb.Value `protobuf:"bytes,2,opt,name=request,proto3" json:"request,omitempty"`
-	// internal: see src/utils/assumptions.ts
-	SenderAssumes int32 `protobuf:"varint,101,opt,name=sender_assumes,json=senderAssumes,proto3" json:"sender_assumes,omitempty"`
-}
-
-func (x *RpcRequest) Reset() {
-	*x = RpcRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RpcRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RpcRequest) ProtoMessage() {}
-
-func (x *RpcRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RpcRequest.ProtoReflect.Descriptor instead.
-func (*RpcRequest) Descriptor() ([]byte, []int) {
-	return file_proto_dynrpc_dynrpc_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *RpcRequest) GetKey() string {
-	if x != nil {
-		return x.Key
-	}
-	return ""
-}
-
-func (x *RpcRequest) GetRequest() *structpb.Value {
-	if x != nil {
-		return x.Request
-	}
-	return nil
-}
-
-func (x *RpcRequest) GetSenderAssumes() int32 {
-	if x != nil {
-		return x.SenderAssumes
-	}
-	return 0
-}
-
-type RpcResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Response *structpb.Value `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
-}
-
-func (x *RpcResponse) Reset() {
-	*x = RpcResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RpcResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RpcResponse) ProtoMessage() {}
-
-func (x *RpcResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_dynrpc_dynrpc_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RpcResponse.ProtoReflect.Descriptor instead.
-func (*RpcResponse) Descriptor() ([]byte, []int) {
-	return file_proto_dynrpc_dynrpc_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *RpcResponse) GetResponse() *structpb.Value {
-	if x != nil {
-		return x.Response
-	}
-	return nil
-}
-
-var File_proto_dynrpc_dynrpc_proto protoreflect.FileDescriptor
-
-var file_proto_dynrpc_dynrpc_proto_rawDesc = []byte{
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-	0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_proto_dynrpc_dynrpc_proto_rawDescOnce sync.Once
-	file_proto_dynrpc_dynrpc_proto_rawDescData = file_proto_dynrpc_dynrpc_proto_rawDesc
-)
-
-func file_proto_dynrpc_dynrpc_proto_rawDescGZIP() []byte {
-	file_proto_dynrpc_dynrpc_proto_rawDescOnce.Do(func() {
-		file_proto_dynrpc_dynrpc_proto_rawDescData = protoimpl.X.CompressGZIP(file_proto_dynrpc_dynrpc_proto_rawDescData)
-	})
-	return file_proto_dynrpc_dynrpc_proto_rawDescData
-}
-
-var file_proto_dynrpc_dynrpc_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
-var file_proto_dynrpc_dynrpc_proto_goTypes = []interface{}{
-	(*KeyedEvent)(nil),     // 0: KeyedEvent
-	(*RpcRequest)(nil),     // 1: RpcRequest
-	(*RpcResponse)(nil),    // 2: RpcResponse
-	nil,                    // 3: KeyedEvent.AttributesEntry
-	(*structpb.Value)(nil), // 4: google.protobuf.Value
-	(*emptypb.Empty)(nil),  // 5: google.protobuf.Empty
-}
-var file_proto_dynrpc_dynrpc_proto_depIdxs = []int32{
-	3, // 0: KeyedEvent.attributes:type_name -> KeyedEvent.AttributesEntry
-	4, // 1: RpcRequest.request:type_name -> google.protobuf.Value
-	4, // 2: RpcResponse.response:type_name -> google.protobuf.Value
-	1, // 3: RpcEndpoint.call:input_type -> RpcRequest
-	0, // 4: RpcEndpoint.handle:input_type -> KeyedEvent
-	1, // 5: UnkeyedRpcEndpoint.call:input_type -> RpcRequest
-	2, // 6: RpcEndpoint.call:output_type -> RpcResponse
-	5, // 7: RpcEndpoint.handle:output_type -> google.protobuf.Empty
-	2, // 8: UnkeyedRpcEndpoint.call:output_type -> RpcResponse
-	6, // [6:9] is the sub-list for method output_type
-	3, // [3:6] is the sub-list for method input_type
-	3, // [3:3] is the sub-list for extension type_name
-	3, // [3:3] is the sub-list for extension extendee
-	0, // [0:3] is the sub-list for field type_name
-}
-
-func init() { file_proto_dynrpc_dynrpc_proto_init() }
-func file_proto_dynrpc_dynrpc_proto_init() {
-	if File_proto_dynrpc_dynrpc_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_proto_dynrpc_dynrpc_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*KeyedEvent); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_dynrpc_dynrpc_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RpcRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_dynrpc_dynrpc_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RpcResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_proto_dynrpc_dynrpc_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   4,
-			NumExtensions: 0,
-			NumServices:   2,
-		},
-		GoTypes:           file_proto_dynrpc_dynrpc_proto_goTypes,
-		DependencyIndexes: file_proto_dynrpc_dynrpc_proto_depIdxs,
-		MessageInfos:      file_proto_dynrpc_dynrpc_proto_msgTypes,
-	}.Build()
-	File_proto_dynrpc_dynrpc_proto = out.File
-	file_proto_dynrpc_dynrpc_proto_rawDesc = nil
-	file_proto_dynrpc_dynrpc_proto_goTypes = nil
-	file_proto_dynrpc_dynrpc_proto_depIdxs = nil
-}
diff --git a/generated/proto/javascript/javascript.pb.go b/generated/proto/javascript/javascript.pb.go
index 1cb551c..114ee38 100644
--- a/generated/proto/javascript/javascript.pb.go
+++ b/generated/proto/javascript/javascript.pb.go
@@ -10,14 +10,14 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.26.0
 // 	protoc        (unknown)
 // source: proto/javascript/javascript.proto
 
 package javascript
 
 import (
-	protocol "github.com/restatedev/sdk-go/generated/proto/protocol"
+	_ "github.com/restatedev/sdk-go/generated/proto/protocol"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -31,144 +31,6 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-type FailureWithTerminal struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Failure  *protocol.Failure `protobuf:"bytes,1,opt,name=failure,proto3" json:"failure,omitempty"`
-	Terminal bool              `protobuf:"varint,2,opt,name=terminal,proto3" json:"terminal,omitempty"`
-}
-
-func (x *FailureWithTerminal) Reset() {
-	*x = FailureWithTerminal{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_javascript_javascript_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *FailureWithTerminal) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*FailureWithTerminal) ProtoMessage() {}
-
-func (x *FailureWithTerminal) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_javascript_javascript_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use FailureWithTerminal.ProtoReflect.Descriptor instead.
-func (*FailureWithTerminal) Descriptor() ([]byte, []int) {
-	return file_proto_javascript_javascript_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *FailureWithTerminal) GetFailure() *protocol.Failure {
-	if x != nil {
-		return x.Failure
-	}
-	return nil
-}
-
-func (x *FailureWithTerminal) GetTerminal() bool {
-	if x != nil {
-		return x.Terminal
-	}
-	return false
-}
-
-// Type: 0xFC00 + 1
-// Flag: RequiresRuntimeAck
-type SideEffectEntryMessage struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Types that are assignable to Result:
-	//
-	//	*SideEffectEntryMessage_Value
-	//	*SideEffectEntryMessage_Failure
-	Result isSideEffectEntryMessage_Result `protobuf_oneof:"result"`
-}
-
-func (x *SideEffectEntryMessage) Reset() {
-	*x = SideEffectEntryMessage{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_javascript_javascript_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SideEffectEntryMessage) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SideEffectEntryMessage) ProtoMessage() {}
-
-func (x *SideEffectEntryMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_javascript_javascript_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use SideEffectEntryMessage.ProtoReflect.Descriptor instead.
-func (*SideEffectEntryMessage) Descriptor() ([]byte, []int) {
-	return file_proto_javascript_javascript_proto_rawDescGZIP(), []int{1}
-}
-
-func (m *SideEffectEntryMessage) GetResult() isSideEffectEntryMessage_Result {
-	if m != nil {
-		return m.Result
-	}
-	return nil
-}
-
-func (x *SideEffectEntryMessage) GetValue() []byte {
-	if x, ok := x.GetResult().(*SideEffectEntryMessage_Value); ok {
-		return x.Value
-	}
-	return nil
-}
-
-func (x *SideEffectEntryMessage) GetFailure() *FailureWithTerminal {
-	if x, ok := x.GetResult().(*SideEffectEntryMessage_Failure); ok {
-		return x.Failure
-	}
-	return nil
-}
-
-type isSideEffectEntryMessage_Result interface {
-	isSideEffectEntryMessage_Result()
-}
-
-type SideEffectEntryMessage_Value struct {
-	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
-}
-
-type SideEffectEntryMessage_Failure struct {
-	Failure *FailureWithTerminal `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
-}
-
-func (*SideEffectEntryMessage_Value) isSideEffectEntryMessage_Result() {}
-
-func (*SideEffectEntryMessage_Failure) isSideEffectEntryMessage_Result() {}
-
 // Type: 0xFC00 + 2
 type CombinatorEntryMessage struct {
 	state         protoimpl.MessageState
@@ -182,7 +44,7 @@ type CombinatorEntryMessage struct {
 func (x *CombinatorEntryMessage) Reset() {
 	*x = CombinatorEntryMessage{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_javascript_javascript_proto_msgTypes[2]
+		mi := &file_proto_javascript_javascript_proto_msgTypes[0]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -195,7 +57,7 @@ func (x *CombinatorEntryMessage) String() string {
 func (*CombinatorEntryMessage) ProtoMessage() {}
 
 func (x *CombinatorEntryMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_javascript_javascript_proto_msgTypes[2]
+	mi := &file_proto_javascript_javascript_proto_msgTypes[0]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -208,7 +70,7 @@ func (x *CombinatorEntryMessage) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CombinatorEntryMessage.ProtoReflect.Descriptor instead.
 func (*CombinatorEntryMessage) Descriptor() ([]byte, []int) {
-	return file_proto_javascript_javascript_proto_rawDescGZIP(), []int{2}
+	return file_proto_javascript_javascript_proto_rawDescGZIP(), []int{0}
 }
 
 func (x *CombinatorEntryMessage) GetCombinatorId() int32 {
@@ -233,47 +95,31 @@ var file_proto_javascript_javascript_proto_rawDesc = []byte{
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+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x37, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
+	0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x64, 0x65, 0x76, 0x2f, 0x73,
+	0x64, 0x6b, 0x2d, 0x67, 0x6f, 0x2f, 0x67, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x65, 0x64, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x6a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, 0x69, 0x70, 0x74,
+	0xa2, 0x02, 0x04, 0x44, 0x52, 0x53, 0x4a, 0xaa, 0x02, 0x1a, 0x44, 0x65, 0x76, 0x2e, 0x52, 0x65,
+	0x73, 0x74, 0x61, 0x74, 0x65, 0x2e, 0x53, 0x64, 0x6b, 0x2e, 0x4a, 0x61, 0x76, 0x61, 0x73, 0x63,
+	0x72, 0x69, 0x70, 0x74, 0xca, 0x02, 0x1a, 0x44, 0x65, 0x76, 0x5c, 0x52, 0x65, 0x73, 0x74, 0x61,
+	0x74, 0x65, 0x5c, 0x53, 0x64, 0x6b, 0x5c, 0x4a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, 0x69, 0x70,
+	0x74, 0xe2, 0x02, 0x26, 0x44, 0x65, 0x76, 0x5c, 0x52, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x5c,
+	0x53, 0x64, 0x6b, 0x5c, 0x4a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, 0x69, 0x70, 0x74, 0x5c, 0x47,
+	0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x1d, 0x44, 0x65, 0x76,
+	0x3a, 0x3a, 0x52, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x3a, 0x3a, 0x53, 0x64, 0x6b, 0x3a, 0x3a,
+	0x4a, 0x61, 0x76, 0x61, 0x73, 0x63, 0x72, 0x69, 0x70, 0x74, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
@@ -288,21 +134,16 @@ func file_proto_javascript_javascript_proto_rawDescGZIP() []byte {
 	return file_proto_javascript_javascript_proto_rawDescData
 }
 
-var file_proto_javascript_javascript_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_proto_javascript_javascript_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
 var file_proto_javascript_javascript_proto_goTypes = []interface{}{
-	(*FailureWithTerminal)(nil),    // 0: dev.restate.sdk.javascript.FailureWithTerminal
-	(*SideEffectEntryMessage)(nil), // 1: dev.restate.sdk.javascript.SideEffectEntryMessage
-	(*CombinatorEntryMessage)(nil), // 2: dev.restate.sdk.javascript.CombinatorEntryMessage
-	(*protocol.Failure)(nil),       // 3: dev.restate.service.protocol.Failure
+	(*CombinatorEntryMessage)(nil), // 0: dev.restate.sdk.javascript.CombinatorEntryMessage
 }
 var file_proto_javascript_javascript_proto_depIdxs = []int32{
-	3, // 0: dev.restate.sdk.javascript.FailureWithTerminal.failure:type_name -> dev.restate.service.protocol.Failure
-	0, // 1: dev.restate.sdk.javascript.SideEffectEntryMessage.failure:type_name -> dev.restate.sdk.javascript.FailureWithTerminal
-	2, // [2:2] is the sub-list for method output_type
-	2, // [2:2] is the sub-list for method input_type
-	2, // [2:2] is the sub-list for extension type_name
-	2, // [2:2] is the sub-list for extension extendee
-	0, // [0:2] is the sub-list for field type_name
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
 }
 
 func init() { file_proto_javascript_javascript_proto_init() }
@@ -312,30 +153,6 @@ func file_proto_javascript_javascript_proto_init() {
 	}
 	if !protoimpl.UnsafeEnabled {
 		file_proto_javascript_javascript_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FailureWithTerminal); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_javascript_javascript_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SideEffectEntryMessage); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_javascript_javascript_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*CombinatorEntryMessage); i {
 			case 0:
 				return &v.state
@@ -348,17 +165,13 @@ func file_proto_javascript_javascript_proto_init() {
 			}
 		}
 	}
-	file_proto_javascript_javascript_proto_msgTypes[1].OneofWrappers = []interface{}{
-		(*SideEffectEntryMessage_Value)(nil),
-		(*SideEffectEntryMessage_Failure)(nil),
-	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proto_javascript_javascript_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   3,
+			NumMessages:   1,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/generated/proto/protocol/protocol.pb.go b/generated/proto/protocol/protocol.pb.go
index da54474..ea25628 100644
--- a/generated/proto/protocol/protocol.pb.go
+++ b/generated/proto/protocol/protocol.pb.go
@@ -9,7 +9,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.26.0
 // 	protoc        (unknown)
 // source: proto/protocol/protocol.proto
 
@@ -18,7 +18,6 @@ package protocol
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	emptypb "google.golang.org/protobuf/types/known/emptypb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -30,23 +29,71 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// Service protocol version.
+type ServiceProtocolVersion int32
+
+const (
+	ServiceProtocolVersion_SERVICE_PROTOCOL_VERSION_UNSPECIFIED ServiceProtocolVersion = 0
+	// initial service protocol version
+	ServiceProtocolVersion_V1 ServiceProtocolVersion = 1
+)
+
+// Enum value maps for ServiceProtocolVersion.
+var (
+	ServiceProtocolVersion_name = map[int32]string{
+		0: "SERVICE_PROTOCOL_VERSION_UNSPECIFIED",
+		1: "V1",
+	}
+	ServiceProtocolVersion_value = map[string]int32{
+		"SERVICE_PROTOCOL_VERSION_UNSPECIFIED": 0,
+		"V1":                                   1,
+	}
+)
+
+func (x ServiceProtocolVersion) Enum() *ServiceProtocolVersion {
+	p := new(ServiceProtocolVersion)
+	*p = x
+	return p
+}
+
+func (x ServiceProtocolVersion) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (ServiceProtocolVersion) Descriptor() protoreflect.EnumDescriptor {
+	return file_proto_protocol_protocol_proto_enumTypes[0].Descriptor()
+}
+
+func (ServiceProtocolVersion) Type() protoreflect.EnumType {
+	return &file_proto_protocol_protocol_proto_enumTypes[0]
+}
+
+func (x ServiceProtocolVersion) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use ServiceProtocolVersion.Descriptor instead.
+func (ServiceProtocolVersion) EnumDescriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{0}
+}
+
 // Type: 0x0000 + 0
 type StartMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Unique id of the invocation. This id is unique across invocations and won't
-	// change when replaying the journal.
+	// Unique id of the invocation. This id is unique across invocations and won't change when replaying the journal.
 	Id []byte `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 	// Invocation id that can be used for logging.
-	// The user can use this id to address this invocation in admin and status
-	// introspection apis.
+	// The user can use this id to address this invocation in admin and status introspection apis.
 	DebugId      string `protobuf:"bytes,2,opt,name=debug_id,json=debugId,proto3" json:"debug_id,omitempty"`
 	KnownEntries uint32 `protobuf:"varint,3,opt,name=known_entries,json=knownEntries,proto3" json:"known_entries,omitempty"`
 	// protolint:disable:next REPEATED_FIELD_NAMES_PLURALIZED
 	StateMap     []*StartMessage_StateEntry `protobuf:"bytes,4,rep,name=state_map,json=stateMap,proto3" json:"state_map,omitempty"`
 	PartialState bool                       `protobuf:"varint,5,opt,name=partial_state,json=partialState,proto3" json:"partial_state,omitempty"`
+	// If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+	Key string `protobuf:"bytes,6,opt,name=key,proto3" json:"key,omitempty"`
 }
 
 func (x *StartMessage) Reset() {
@@ -116,6 +163,13 @@ func (x *StartMessage) GetPartialState() bool {
 	return false
 }
 
+func (x *StartMessage) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
 // Type: 0x0000 + 1
 type CompletionMessage struct {
 	state         protoimpl.MessageState
@@ -177,7 +231,7 @@ func (m *CompletionMessage) GetResult() isCompletionMessage_Result {
 	return nil
 }
 
-func (x *CompletionMessage) GetEmpty() *emptypb.Empty {
+func (x *CompletionMessage) GetEmpty() *Empty {
 	if x, ok := x.GetResult().(*CompletionMessage_Empty); ok {
 		return x.Empty
 	}
@@ -203,7 +257,7 @@ type isCompletionMessage_Result interface {
 }
 
 type CompletionMessage_Empty struct {
-	Empty *emptypb.Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+	Empty *Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
 }
 
 type CompletionMessage_Value struct {
@@ -227,10 +281,10 @@ type SuspensionMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// This list represents any of the entry_index the invocation is waiting on to
-	// progress. The runtime will resume the invocation as soon as one of the
-	// given entry_index is completed. This list MUST not be empty. False
-	// positive, entry_indexes is a valid plural of entry_indices.
+	// This list represents any of the entry_index the invocation is waiting on to progress.
+	// The runtime will resume the invocation as soon as one of the given entry_index is completed.
+	// This list MUST not be empty.
+	// False positive, entry_indexes is a valid plural of entry_indices.
 	// https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/i/index-indexes-indices
 	EntryIndexes []uint32 `protobuf:"varint,1,rep,packed,name=entry_indexes,json=entryIndexes,proto3" json:"entry_indexes,omitempty"` // protolint:disable:this REPEATED_FIELD_NAMES_PLURALIZED
 }
@@ -280,21 +334,22 @@ type ErrorMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The code can be:
-	// * Any of the error codes defined by OutputStreamEntry.failure (see Failure
-	// message)
-	// * JOURNAL_MISMATCH = 32, that is when the SDK cannot replay a journal due
-	// to the mismatch between the journal and the actual code.
-	// * PROTOCOL_VIOLATION = 33, that is when the SDK receives an unexpected
-	// message or an expected message variant, given its state.
-	//
-	// If 16 < code < 32, or code > 33, the runtime will interpret it as code 2
-	// (UNKNOWN).
+	// The code can be any HTTP status code, as described https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml.
+	// In addition, we define the following error codes that MAY be used by the SDK for better error reporting:
+	// * JOURNAL_MISMATCH = 570, that is when the SDK cannot replay a journal due to the mismatch between the journal and the actual code.
+	// * PROTOCOL_VIOLATION = 571, that is when the SDK receives an unexpected message or an expected message variant, given its state.
 	Code uint32 `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
 	// Contains a concise error message, e.g. Throwable#getMessage() in Java.
 	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
 	// Contains a verbose error description, e.g. the exception stacktrace.
 	Description string `protobuf:"bytes,3,opt,name=description,proto3" json:"description,omitempty"`
+	// Entry that caused the failure. This may be outside the current stored journal size.
+	// If no specific entry caused the failure, the current replayed/processed entry can be used.
+	RelatedEntryIndex *uint32 `protobuf:"varint,4,opt,name=related_entry_index,json=relatedEntryIndex,proto3,oneof" json:"related_entry_index,omitempty"`
+	// Name of the entry that caused the failure.
+	RelatedEntryName *string `protobuf:"bytes,5,opt,name=related_entry_name,json=relatedEntryName,proto3,oneof" json:"related_entry_name,omitempty"`
+	// Entry type.
+	RelatedEntryType *uint32 `protobuf:"varint,6,opt,name=related_entry_type,json=relatedEntryType,proto3,oneof" json:"related_entry_type,omitempty"`
 }
 
 func (x *ErrorMessage) Reset() {
@@ -350,6 +405,27 @@ func (x *ErrorMessage) GetDescription() string {
 	return ""
 }
 
+func (x *ErrorMessage) GetRelatedEntryIndex() uint32 {
+	if x != nil && x.RelatedEntryIndex != nil {
+		return *x.RelatedEntryIndex
+	}
+	return 0
+}
+
+func (x *ErrorMessage) GetRelatedEntryName() string {
+	if x != nil && x.RelatedEntryName != nil {
+		return *x.RelatedEntryName
+	}
+	return ""
+}
+
+func (x *ErrorMessage) GetRelatedEntryType() uint32 {
+	if x != nil && x.RelatedEntryType != nil {
+		return *x.RelatedEntryType
+	}
+	return 0
+}
+
 // Type: 0x0000 + 4
 type EntryAckMessage struct {
 	state         protoimpl.MessageState
@@ -438,23 +514,22 @@ func (*EndMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{5}
 }
 
-// Completable: Yes
+// Completable: No
 // Fallible: No
 // Type: 0x0400 + 0
-type PollInputStreamEntryMessage struct {
+type InputEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Types that are assignable to Result:
-	//
-	//	*PollInputStreamEntryMessage_Value
-	//	*PollInputStreamEntryMessage_Failure
-	Result isPollInputStreamEntryMessage_Result `protobuf_oneof:"result"`
+	Headers []*Header `protobuf:"bytes,1,rep,name=headers,proto3" json:"headers,omitempty"`
+	Value   []byte    `protobuf:"bytes,14,opt,name=value,proto3" json:"value,omitempty"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *PollInputStreamEntryMessage) Reset() {
-	*x = PollInputStreamEntryMessage{}
+func (x *InputEntryMessage) Reset() {
+	*x = InputEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -462,13 +537,13 @@ func (x *PollInputStreamEntryMessage) Reset() {
 	}
 }
 
-func (x *PollInputStreamEntryMessage) String() string {
+func (x *InputEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*PollInputStreamEntryMessage) ProtoMessage() {}
+func (*InputEntryMessage) ProtoMessage() {}
 
-func (x *PollInputStreamEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *InputEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -480,65 +555,51 @@ func (x *PollInputStreamEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use PollInputStreamEntryMessage.ProtoReflect.Descriptor instead.
-func (*PollInputStreamEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use InputEntryMessage.ProtoReflect.Descriptor instead.
+func (*InputEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{6}
 }
 
-func (m *PollInputStreamEntryMessage) GetResult() isPollInputStreamEntryMessage_Result {
-	if m != nil {
-		return m.Result
+func (x *InputEntryMessage) GetHeaders() []*Header {
+	if x != nil {
+		return x.Headers
 	}
 	return nil
 }
 
-func (x *PollInputStreamEntryMessage) GetValue() []byte {
-	if x, ok := x.GetResult().(*PollInputStreamEntryMessage_Value); ok {
+func (x *InputEntryMessage) GetValue() []byte {
+	if x != nil {
 		return x.Value
 	}
 	return nil
 }
 
-func (x *PollInputStreamEntryMessage) GetFailure() *Failure {
-	if x, ok := x.GetResult().(*PollInputStreamEntryMessage_Failure); ok {
-		return x.Failure
+func (x *InputEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
 	}
-	return nil
-}
-
-type isPollInputStreamEntryMessage_Result interface {
-	isPollInputStreamEntryMessage_Result()
-}
-
-type PollInputStreamEntryMessage_Value struct {
-	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
-}
-
-type PollInputStreamEntryMessage_Failure struct {
-	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
+	return ""
 }
 
-func (*PollInputStreamEntryMessage_Value) isPollInputStreamEntryMessage_Result() {}
-
-func (*PollInputStreamEntryMessage_Failure) isPollInputStreamEntryMessage_Result() {}
-
 // Completable: No
 // Fallible: No
 // Type: 0x0400 + 1
-type OutputStreamEntryMessage struct {
+type OutputEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to Result:
 	//
-	//	*OutputStreamEntryMessage_Value
-	//	*OutputStreamEntryMessage_Failure
-	Result isOutputStreamEntryMessage_Result `protobuf_oneof:"result"`
+	//	*OutputEntryMessage_Value
+	//	*OutputEntryMessage_Failure
+	Result isOutputEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *OutputStreamEntryMessage) Reset() {
-	*x = OutputStreamEntryMessage{}
+func (x *OutputEntryMessage) Reset() {
+	*x = OutputEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -546,13 +607,13 @@ func (x *OutputStreamEntryMessage) Reset() {
 	}
 }
 
-func (x *OutputStreamEntryMessage) String() string {
+func (x *OutputEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*OutputStreamEntryMessage) ProtoMessage() {}
+func (*OutputEntryMessage) ProtoMessage() {}
 
-func (x *OutputStreamEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *OutputEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -564,47 +625,54 @@ func (x *OutputStreamEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use OutputStreamEntryMessage.ProtoReflect.Descriptor instead.
-func (*OutputStreamEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use OutputEntryMessage.ProtoReflect.Descriptor instead.
+func (*OutputEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{7}
 }
 
-func (m *OutputStreamEntryMessage) GetResult() isOutputStreamEntryMessage_Result {
+func (m *OutputEntryMessage) GetResult() isOutputEntryMessage_Result {
 	if m != nil {
 		return m.Result
 	}
 	return nil
 }
 
-func (x *OutputStreamEntryMessage) GetValue() []byte {
-	if x, ok := x.GetResult().(*OutputStreamEntryMessage_Value); ok {
+func (x *OutputEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*OutputEntryMessage_Value); ok {
 		return x.Value
 	}
 	return nil
 }
 
-func (x *OutputStreamEntryMessage) GetFailure() *Failure {
-	if x, ok := x.GetResult().(*OutputStreamEntryMessage_Failure); ok {
+func (x *OutputEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*OutputEntryMessage_Failure); ok {
 		return x.Failure
 	}
 	return nil
 }
 
-type isOutputStreamEntryMessage_Result interface {
-	isOutputStreamEntryMessage_Result()
+func (x *OutputEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type isOutputEntryMessage_Result interface {
+	isOutputEntryMessage_Result()
 }
 
-type OutputStreamEntryMessage_Value struct {
+type OutputEntryMessage_Value struct {
 	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
 }
 
-type OutputStreamEntryMessage_Failure struct {
+type OutputEntryMessage_Failure struct {
 	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
 }
 
-func (*OutputStreamEntryMessage_Value) isOutputStreamEntryMessage_Result() {}
+func (*OutputEntryMessage_Value) isOutputEntryMessage_Result() {}
 
-func (*OutputStreamEntryMessage_Failure) isOutputStreamEntryMessage_Result() {}
+func (*OutputEntryMessage_Failure) isOutputEntryMessage_Result() {}
 
 // Completable: Yes
 // Fallible: No
@@ -621,6 +689,8 @@ type GetStateEntryMessage struct {
 	//	*GetStateEntryMessage_Value
 	//	*GetStateEntryMessage_Failure
 	Result isGetStateEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *GetStateEntryMessage) Reset() {
@@ -669,7 +739,7 @@ func (m *GetStateEntryMessage) GetResult() isGetStateEntryMessage_Result {
 	return nil
 }
 
-func (x *GetStateEntryMessage) GetEmpty() *emptypb.Empty {
+func (x *GetStateEntryMessage) GetEmpty() *Empty {
 	if x, ok := x.GetResult().(*GetStateEntryMessage_Empty); ok {
 		return x.Empty
 	}
@@ -690,12 +760,19 @@ func (x *GetStateEntryMessage) GetFailure() *Failure {
 	return nil
 }
 
+func (x *GetStateEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 type isGetStateEntryMessage_Result interface {
 	isGetStateEntryMessage_Result()
 }
 
 type GetStateEntryMessage_Empty struct {
-	Empty *emptypb.Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+	Empty *Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
 }
 
 type GetStateEntryMessage_Value struct {
@@ -722,6 +799,8 @@ type SetStateEntryMessage struct {
 
 	Key   []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	Value []byte `protobuf:"bytes,3,opt,name=value,proto3" json:"value,omitempty"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *SetStateEntryMessage) Reset() {
@@ -770,6 +849,13 @@ func (x *SetStateEntryMessage) GetValue() []byte {
 	return nil
 }
 
+func (x *SetStateEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 // Completable: No
 // Fallible: No
 // Type: 0x0800 + 2
@@ -779,6 +865,8 @@ type ClearStateEntryMessage struct {
 	unknownFields protoimpl.UnknownFields
 
 	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *ClearStateEntryMessage) Reset() {
@@ -820,6 +908,13 @@ func (x *ClearStateEntryMessage) GetKey() []byte {
 	return nil
 }
 
+func (x *ClearStateEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 // Completable: No
 // Fallible: No
 // Type: 0x0800 + 3
@@ -827,6 +922,9 @@ type ClearAllStateEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *ClearAllStateEntryMessage) Reset() {
@@ -861,6 +959,13 @@ func (*ClearAllStateEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{11}
 }
 
+func (x *ClearAllStateEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 // Completable: Yes
 // Fallible: No
 // Type: 0x0800 + 4
@@ -874,6 +979,8 @@ type GetStateKeysEntryMessage struct {
 	//	*GetStateKeysEntryMessage_Value
 	//	*GetStateKeysEntryMessage_Failure
 	Result isGetStateKeysEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
 func (x *GetStateKeysEntryMessage) Reset() {
@@ -929,6 +1036,13 @@ func (x *GetStateKeysEntryMessage) GetFailure() *Failure {
 	return nil
 }
 
+func (x *GetStateKeysEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 type isGetStateKeysEntryMessage_Result interface {
 	isGetStateKeysEntryMessage_Result()
 }
@@ -947,24 +1061,24 @@ func (*GetStateKeysEntryMessage_Failure) isGetStateKeysEntryMessage_Result() {}
 
 // Completable: Yes
 // Fallible: No
-// Type: 0x0C00 + 0
-type SleepEntryMessage struct {
+// Type: 0x0800 + 8
+type GetPromiseEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Wake up time.
-	// The time is set as duration since UNIX Epoch.
-	WakeUpTime uint64 `protobuf:"varint,1,opt,name=wake_up_time,json=wakeUpTime,proto3" json:"wake_up_time,omitempty"`
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Types that are assignable to Result:
 	//
-	//	*SleepEntryMessage_Empty
-	//	*SleepEntryMessage_Failure
-	Result isSleepEntryMessage_Result `protobuf_oneof:"result"`
+	//	*GetPromiseEntryMessage_Value
+	//	*GetPromiseEntryMessage_Failure
+	Result isGetPromiseEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *SleepEntryMessage) Reset() {
-	*x = SleepEntryMessage{}
+func (x *GetPromiseEntryMessage) Reset() {
+	*x = GetPromiseEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -972,13 +1086,13 @@ func (x *SleepEntryMessage) Reset() {
 	}
 }
 
-func (x *SleepEntryMessage) String() string {
+func (x *GetPromiseEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*SleepEntryMessage) ProtoMessage() {}
+func (*GetPromiseEntryMessage) ProtoMessage() {}
 
-func (x *SleepEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *GetPromiseEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -990,75 +1104,83 @@ func (x *SleepEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use SleepEntryMessage.ProtoReflect.Descriptor instead.
-func (*SleepEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use GetPromiseEntryMessage.ProtoReflect.Descriptor instead.
+func (*GetPromiseEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{13}
 }
 
-func (x *SleepEntryMessage) GetWakeUpTime() uint64 {
+func (x *GetPromiseEntryMessage) GetKey() string {
 	if x != nil {
-		return x.WakeUpTime
+		return x.Key
 	}
-	return 0
+	return ""
 }
 
-func (m *SleepEntryMessage) GetResult() isSleepEntryMessage_Result {
+func (m *GetPromiseEntryMessage) GetResult() isGetPromiseEntryMessage_Result {
 	if m != nil {
 		return m.Result
 	}
 	return nil
 }
 
-func (x *SleepEntryMessage) GetEmpty() *emptypb.Empty {
-	if x, ok := x.GetResult().(*SleepEntryMessage_Empty); ok {
-		return x.Empty
+func (x *GetPromiseEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*GetPromiseEntryMessage_Value); ok {
+		return x.Value
 	}
 	return nil
 }
 
-func (x *SleepEntryMessage) GetFailure() *Failure {
-	if x, ok := x.GetResult().(*SleepEntryMessage_Failure); ok {
+func (x *GetPromiseEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*GetPromiseEntryMessage_Failure); ok {
 		return x.Failure
 	}
 	return nil
 }
 
-type isSleepEntryMessage_Result interface {
-	isSleepEntryMessage_Result()
+func (x *GetPromiseEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
 }
 
-type SleepEntryMessage_Empty struct {
-	Empty *emptypb.Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+type isGetPromiseEntryMessage_Result interface {
+	isGetPromiseEntryMessage_Result()
 }
 
-type SleepEntryMessage_Failure struct {
+type GetPromiseEntryMessage_Value struct {
+	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
+}
+
+type GetPromiseEntryMessage_Failure struct {
 	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
 }
 
-func (*SleepEntryMessage_Empty) isSleepEntryMessage_Result() {}
+func (*GetPromiseEntryMessage_Value) isGetPromiseEntryMessage_Result() {}
 
-func (*SleepEntryMessage_Failure) isSleepEntryMessage_Result() {}
+func (*GetPromiseEntryMessage_Failure) isGetPromiseEntryMessage_Result() {}
 
 // Completable: Yes
-// Fallible: Yes
-// Type: 0x0C00 + 1
-type InvokeEntryMessage struct {
+// Fallible: No
+// Type: 0x0800 + 9
+type PeekPromiseEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ServiceName string `protobuf:"bytes,1,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
-	MethodName  string `protobuf:"bytes,2,opt,name=method_name,json=methodName,proto3" json:"method_name,omitempty"`
-	Parameter   []byte `protobuf:"bytes,3,opt,name=parameter,proto3" json:"parameter,omitempty"`
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Types that are assignable to Result:
 	//
-	//	*InvokeEntryMessage_Value
-	//	*InvokeEntryMessage_Failure
-	Result isInvokeEntryMessage_Result `protobuf_oneof:"result"`
+	//	*PeekPromiseEntryMessage_Empty
+	//	*PeekPromiseEntryMessage_Value
+	//	*PeekPromiseEntryMessage_Failure
+	Result isPeekPromiseEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *InvokeEntryMessage) Reset() {
-	*x = InvokeEntryMessage{}
+func (x *PeekPromiseEntryMessage) Reset() {
+	*x = PeekPromiseEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1066,13 +1188,13 @@ func (x *InvokeEntryMessage) Reset() {
 	}
 }
 
-func (x *InvokeEntryMessage) String() string {
+func (x *PeekPromiseEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*InvokeEntryMessage) ProtoMessage() {}
+func (*PeekPromiseEntryMessage) ProtoMessage() {}
 
-func (x *InvokeEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *PeekPromiseEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1084,89 +1206,102 @@ func (x *InvokeEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use InvokeEntryMessage.ProtoReflect.Descriptor instead.
-func (*InvokeEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use PeekPromiseEntryMessage.ProtoReflect.Descriptor instead.
+func (*PeekPromiseEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{14}
 }
 
-func (x *InvokeEntryMessage) GetServiceName() string {
-	if x != nil {
-		return x.ServiceName
-	}
-	return ""
-}
-
-func (x *InvokeEntryMessage) GetMethodName() string {
+func (x *PeekPromiseEntryMessage) GetKey() string {
 	if x != nil {
-		return x.MethodName
+		return x.Key
 	}
 	return ""
 }
 
-func (x *InvokeEntryMessage) GetParameter() []byte {
-	if x != nil {
-		return x.Parameter
+func (m *PeekPromiseEntryMessage) GetResult() isPeekPromiseEntryMessage_Result {
+	if m != nil {
+		return m.Result
 	}
 	return nil
 }
 
-func (m *InvokeEntryMessage) GetResult() isInvokeEntryMessage_Result {
-	if m != nil {
-		return m.Result
+func (x *PeekPromiseEntryMessage) GetEmpty() *Empty {
+	if x, ok := x.GetResult().(*PeekPromiseEntryMessage_Empty); ok {
+		return x.Empty
 	}
 	return nil
 }
 
-func (x *InvokeEntryMessage) GetValue() []byte {
-	if x, ok := x.GetResult().(*InvokeEntryMessage_Value); ok {
+func (x *PeekPromiseEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*PeekPromiseEntryMessage_Value); ok {
 		return x.Value
 	}
 	return nil
 }
 
-func (x *InvokeEntryMessage) GetFailure() *Failure {
-	if x, ok := x.GetResult().(*InvokeEntryMessage_Failure); ok {
+func (x *PeekPromiseEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*PeekPromiseEntryMessage_Failure); ok {
 		return x.Failure
 	}
 	return nil
 }
 
-type isInvokeEntryMessage_Result interface {
-	isInvokeEntryMessage_Result()
+func (x *PeekPromiseEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type isPeekPromiseEntryMessage_Result interface {
+	isPeekPromiseEntryMessage_Result()
 }
 
-type InvokeEntryMessage_Value struct {
+type PeekPromiseEntryMessage_Empty struct {
+	Empty *Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+}
+
+type PeekPromiseEntryMessage_Value struct {
 	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
 }
 
-type InvokeEntryMessage_Failure struct {
+type PeekPromiseEntryMessage_Failure struct {
 	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
 }
 
-func (*InvokeEntryMessage_Value) isInvokeEntryMessage_Result() {}
+func (*PeekPromiseEntryMessage_Empty) isPeekPromiseEntryMessage_Result() {}
 
-func (*InvokeEntryMessage_Failure) isInvokeEntryMessage_Result() {}
+func (*PeekPromiseEntryMessage_Value) isPeekPromiseEntryMessage_Result() {}
 
-// Completable: No
-// Fallible: Yes
-// Type: 0x0C00 + 2
-type BackgroundInvokeEntryMessage struct {
+func (*PeekPromiseEntryMessage_Failure) isPeekPromiseEntryMessage_Result() {}
+
+// Completable: Yes
+// Fallible: No
+// Type: 0x0800 + A
+type CompletePromiseEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	ServiceName string `protobuf:"bytes,1,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
-	MethodName  string `protobuf:"bytes,2,opt,name=method_name,json=methodName,proto3" json:"method_name,omitempty"`
-	Parameter   []byte `protobuf:"bytes,3,opt,name=parameter,proto3" json:"parameter,omitempty"`
-	// Time when this BackgroundInvoke should be executed.
-	// The time is set as duration since UNIX Epoch.
-	// If this value is not set, equal to 0, or past in time,
-	// the runtime will execute this BackgroundInvoke as soon as possible.
-	InvokeTime uint64 `protobuf:"varint,4,opt,name=invoke_time,json=invokeTime,proto3" json:"invoke_time,omitempty"`
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// The value to use to complete the promise
+	//
+	// Types that are assignable to Completion:
+	//
+	//	*CompletePromiseEntryMessage_CompletionValue
+	//	*CompletePromiseEntryMessage_CompletionFailure
+	Completion isCompletePromiseEntryMessage_Completion `protobuf_oneof:"completion"`
+	// Types that are assignable to Result:
+	//
+	//	*CompletePromiseEntryMessage_Empty
+	//	*CompletePromiseEntryMessage_Failure
+	Result isCompletePromiseEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *BackgroundInvokeEntryMessage) Reset() {
-	*x = BackgroundInvokeEntryMessage{}
+func (x *CompletePromiseEntryMessage) Reset() {
+	*x = CompletePromiseEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1174,13 +1309,13 @@ func (x *BackgroundInvokeEntryMessage) Reset() {
 	}
 }
 
-func (x *BackgroundInvokeEntryMessage) String() string {
+func (x *CompletePromiseEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*BackgroundInvokeEntryMessage) ProtoMessage() {}
+func (*CompletePromiseEntryMessage) ProtoMessage() {}
 
-func (x *BackgroundInvokeEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *CompletePromiseEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1192,58 +1327,123 @@ func (x *BackgroundInvokeEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use BackgroundInvokeEntryMessage.ProtoReflect.Descriptor instead.
-func (*BackgroundInvokeEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use CompletePromiseEntryMessage.ProtoReflect.Descriptor instead.
+func (*CompletePromiseEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{15}
 }
 
-func (x *BackgroundInvokeEntryMessage) GetServiceName() string {
+func (x *CompletePromiseEntryMessage) GetKey() string {
 	if x != nil {
-		return x.ServiceName
+		return x.Key
 	}
 	return ""
 }
 
-func (x *BackgroundInvokeEntryMessage) GetMethodName() string {
-	if x != nil {
-		return x.MethodName
+func (m *CompletePromiseEntryMessage) GetCompletion() isCompletePromiseEntryMessage_Completion {
+	if m != nil {
+		return m.Completion
 	}
-	return ""
+	return nil
 }
 
-func (x *BackgroundInvokeEntryMessage) GetParameter() []byte {
-	if x != nil {
-		return x.Parameter
+func (x *CompletePromiseEntryMessage) GetCompletionValue() []byte {
+	if x, ok := x.GetCompletion().(*CompletePromiseEntryMessage_CompletionValue); ok {
+		return x.CompletionValue
+	}
+	return nil
+}
+
+func (x *CompletePromiseEntryMessage) GetCompletionFailure() *Failure {
+	if x, ok := x.GetCompletion().(*CompletePromiseEntryMessage_CompletionFailure); ok {
+		return x.CompletionFailure
+	}
+	return nil
+}
+
+func (m *CompletePromiseEntryMessage) GetResult() isCompletePromiseEntryMessage_Result {
+	if m != nil {
+		return m.Result
 	}
 	return nil
 }
 
-func (x *BackgroundInvokeEntryMessage) GetInvokeTime() uint64 {
+func (x *CompletePromiseEntryMessage) GetEmpty() *Empty {
+	if x, ok := x.GetResult().(*CompletePromiseEntryMessage_Empty); ok {
+		return x.Empty
+	}
+	return nil
+}
+
+func (x *CompletePromiseEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*CompletePromiseEntryMessage_Failure); ok {
+		return x.Failure
+	}
+	return nil
+}
+
+func (x *CompletePromiseEntryMessage) GetName() string {
 	if x != nil {
-		return x.InvokeTime
+		return x.Name
 	}
-	return 0
+	return ""
+}
+
+type isCompletePromiseEntryMessage_Completion interface {
+	isCompletePromiseEntryMessage_Completion()
+}
+
+type CompletePromiseEntryMessage_CompletionValue struct {
+	CompletionValue []byte `protobuf:"bytes,2,opt,name=completion_value,json=completionValue,proto3,oneof"`
+}
+
+type CompletePromiseEntryMessage_CompletionFailure struct {
+	CompletionFailure *Failure `protobuf:"bytes,3,opt,name=completion_failure,json=completionFailure,proto3,oneof"`
+}
+
+func (*CompletePromiseEntryMessage_CompletionValue) isCompletePromiseEntryMessage_Completion() {}
+
+func (*CompletePromiseEntryMessage_CompletionFailure) isCompletePromiseEntryMessage_Completion() {}
+
+type isCompletePromiseEntryMessage_Result interface {
+	isCompletePromiseEntryMessage_Result()
+}
+
+type CompletePromiseEntryMessage_Empty struct {
+	// Returns empty if value was set successfully
+	Empty *Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+}
+
+type CompletePromiseEntryMessage_Failure struct {
+	// Returns a failure if the promise was already completed
+	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
 }
 
+func (*CompletePromiseEntryMessage_Empty) isCompletePromiseEntryMessage_Result() {}
+
+func (*CompletePromiseEntryMessage_Failure) isCompletePromiseEntryMessage_Result() {}
+
 // Completable: Yes
 // Fallible: No
-// Type: 0x0C00 + 3
-// Awakeables are addressed by an identifier exposed to the user. See the spec
-// for more details.
-type AwakeableEntryMessage struct {
+// Type: 0x0C00 + 0
+type SleepEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// Wake up time.
+	// The time is set as duration since UNIX Epoch.
+	WakeUpTime uint64 `protobuf:"varint,1,opt,name=wake_up_time,json=wakeUpTime,proto3" json:"wake_up_time,omitempty"`
 	// Types that are assignable to Result:
 	//
-	//	*AwakeableEntryMessage_Value
-	//	*AwakeableEntryMessage_Failure
-	Result isAwakeableEntryMessage_Result `protobuf_oneof:"result"`
+	//	*SleepEntryMessage_Empty
+	//	*SleepEntryMessage_Failure
+	Result isSleepEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *AwakeableEntryMessage) Reset() {
-	*x = AwakeableEntryMessage{}
+func (x *SleepEntryMessage) Reset() {
+	*x = SleepEntryMessage{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_proto_protocol_protocol_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1251,13 +1451,13 @@ func (x *AwakeableEntryMessage) Reset() {
 	}
 }
 
-func (x *AwakeableEntryMessage) String() string {
+func (x *SleepEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*AwakeableEntryMessage) ProtoMessage() {}
+func (*SleepEntryMessage) ProtoMessage() {}
 
-func (x *AwakeableEntryMessage) ProtoReflect() protoreflect.Message {
+func (x *SleepEntryMessage) ProtoReflect() protoreflect.Message {
 	mi := &file_proto_protocol_protocol_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1269,16 +1469,355 @@ func (x *AwakeableEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use AwakeableEntryMessage.ProtoReflect.Descriptor instead.
-func (*AwakeableEntryMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use SleepEntryMessage.ProtoReflect.Descriptor instead.
+func (*SleepEntryMessage) Descriptor() ([]byte, []int) {
 	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{16}
 }
 
-func (m *AwakeableEntryMessage) GetResult() isAwakeableEntryMessage_Result {
-	if m != nil {
-		return m.Result
+func (x *SleepEntryMessage) GetWakeUpTime() uint64 {
+	if x != nil {
+		return x.WakeUpTime
 	}
-	return nil
+	return 0
+}
+
+func (m *SleepEntryMessage) GetResult() isSleepEntryMessage_Result {
+	if m != nil {
+		return m.Result
+	}
+	return nil
+}
+
+func (x *SleepEntryMessage) GetEmpty() *Empty {
+	if x, ok := x.GetResult().(*SleepEntryMessage_Empty); ok {
+		return x.Empty
+	}
+	return nil
+}
+
+func (x *SleepEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*SleepEntryMessage_Failure); ok {
+		return x.Failure
+	}
+	return nil
+}
+
+func (x *SleepEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type isSleepEntryMessage_Result interface {
+	isSleepEntryMessage_Result()
+}
+
+type SleepEntryMessage_Empty struct {
+	Empty *Empty `protobuf:"bytes,13,opt,name=empty,proto3,oneof"`
+}
+
+type SleepEntryMessage_Failure struct {
+	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
+}
+
+func (*SleepEntryMessage_Empty) isSleepEntryMessage_Result() {}
+
+func (*SleepEntryMessage_Failure) isSleepEntryMessage_Result() {}
+
+// Completable: Yes
+// Fallible: Yes
+// Type: 0x0C00 + 1
+type CallEntryMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ServiceName string    `protobuf:"bytes,1,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
+	HandlerName string    `protobuf:"bytes,2,opt,name=handler_name,json=handlerName,proto3" json:"handler_name,omitempty"`
+	Parameter   []byte    `protobuf:"bytes,3,opt,name=parameter,proto3" json:"parameter,omitempty"`
+	Headers     []*Header `protobuf:"bytes,4,rep,name=headers,proto3" json:"headers,omitempty"`
+	// If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+	Key string `protobuf:"bytes,5,opt,name=key,proto3" json:"key,omitempty"`
+	// Types that are assignable to Result:
+	//
+	//	*CallEntryMessage_Value
+	//	*CallEntryMessage_Failure
+	Result isCallEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *CallEntryMessage) Reset() {
+	*x = CallEntryMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[17]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CallEntryMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CallEntryMessage) ProtoMessage() {}
+
+func (x *CallEntryMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[17]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CallEntryMessage.ProtoReflect.Descriptor instead.
+func (*CallEntryMessage) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{17}
+}
+
+func (x *CallEntryMessage) GetServiceName() string {
+	if x != nil {
+		return x.ServiceName
+	}
+	return ""
+}
+
+func (x *CallEntryMessage) GetHandlerName() string {
+	if x != nil {
+		return x.HandlerName
+	}
+	return ""
+}
+
+func (x *CallEntryMessage) GetParameter() []byte {
+	if x != nil {
+		return x.Parameter
+	}
+	return nil
+}
+
+func (x *CallEntryMessage) GetHeaders() []*Header {
+	if x != nil {
+		return x.Headers
+	}
+	return nil
+}
+
+func (x *CallEntryMessage) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (m *CallEntryMessage) GetResult() isCallEntryMessage_Result {
+	if m != nil {
+		return m.Result
+	}
+	return nil
+}
+
+func (x *CallEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*CallEntryMessage_Value); ok {
+		return x.Value
+	}
+	return nil
+}
+
+func (x *CallEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*CallEntryMessage_Failure); ok {
+		return x.Failure
+	}
+	return nil
+}
+
+func (x *CallEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type isCallEntryMessage_Result interface {
+	isCallEntryMessage_Result()
+}
+
+type CallEntryMessage_Value struct {
+	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
+}
+
+type CallEntryMessage_Failure struct {
+	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
+}
+
+func (*CallEntryMessage_Value) isCallEntryMessage_Result() {}
+
+func (*CallEntryMessage_Failure) isCallEntryMessage_Result() {}
+
+// Completable: No
+// Fallible: Yes
+// Type: 0x0C00 + 2
+type OneWayCallEntryMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ServiceName string `protobuf:"bytes,1,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
+	HandlerName string `protobuf:"bytes,2,opt,name=handler_name,json=handlerName,proto3" json:"handler_name,omitempty"`
+	Parameter   []byte `protobuf:"bytes,3,opt,name=parameter,proto3" json:"parameter,omitempty"`
+	// Time when this BackgroundInvoke should be executed.
+	// The time is set as duration since UNIX Epoch.
+	// If this value is not set, equal to 0, or past in time,
+	// the runtime will execute this BackgroundInvoke as soon as possible.
+	InvokeTime uint64    `protobuf:"varint,4,opt,name=invoke_time,json=invokeTime,proto3" json:"invoke_time,omitempty"`
+	Headers    []*Header `protobuf:"bytes,5,rep,name=headers,proto3" json:"headers,omitempty"`
+	// If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+	Key string `protobuf:"bytes,6,opt,name=key,proto3" json:"key,omitempty"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *OneWayCallEntryMessage) Reset() {
+	*x = OneWayCallEntryMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OneWayCallEntryMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OneWayCallEntryMessage) ProtoMessage() {}
+
+func (x *OneWayCallEntryMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OneWayCallEntryMessage.ProtoReflect.Descriptor instead.
+func (*OneWayCallEntryMessage) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *OneWayCallEntryMessage) GetServiceName() string {
+	if x != nil {
+		return x.ServiceName
+	}
+	return ""
+}
+
+func (x *OneWayCallEntryMessage) GetHandlerName() string {
+	if x != nil {
+		return x.HandlerName
+	}
+	return ""
+}
+
+func (x *OneWayCallEntryMessage) GetParameter() []byte {
+	if x != nil {
+		return x.Parameter
+	}
+	return nil
+}
+
+func (x *OneWayCallEntryMessage) GetInvokeTime() uint64 {
+	if x != nil {
+		return x.InvokeTime
+	}
+	return 0
+}
+
+func (x *OneWayCallEntryMessage) GetHeaders() []*Header {
+	if x != nil {
+		return x.Headers
+	}
+	return nil
+}
+
+func (x *OneWayCallEntryMessage) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (x *OneWayCallEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+// Completable: Yes
+// Fallible: No
+// Type: 0x0C00 + 3
+// Awakeables are addressed by an identifier exposed to the user. See the spec for more details.
+type AwakeableEntryMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Types that are assignable to Result:
+	//
+	//	*AwakeableEntryMessage_Value
+	//	*AwakeableEntryMessage_Failure
+	Result isAwakeableEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *AwakeableEntryMessage) Reset() {
+	*x = AwakeableEntryMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[19]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *AwakeableEntryMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AwakeableEntryMessage) ProtoMessage() {}
+
+func (x *AwakeableEntryMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[19]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AwakeableEntryMessage.ProtoReflect.Descriptor instead.
+func (*AwakeableEntryMessage) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{19}
+}
+
+func (m *AwakeableEntryMessage) GetResult() isAwakeableEntryMessage_Result {
+	if m != nil {
+		return m.Result
+	}
+	return nil
 }
 
 func (x *AwakeableEntryMessage) GetValue() []byte {
@@ -1292,59 +1831,169 @@ func (x *AwakeableEntryMessage) GetFailure() *Failure {
 	if x, ok := x.GetResult().(*AwakeableEntryMessage_Failure); ok {
 		return x.Failure
 	}
-	return nil
+	return nil
+}
+
+func (x *AwakeableEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+type isAwakeableEntryMessage_Result interface {
+	isAwakeableEntryMessage_Result()
+}
+
+type AwakeableEntryMessage_Value struct {
+	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
+}
+
+type AwakeableEntryMessage_Failure struct {
+	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
+}
+
+func (*AwakeableEntryMessage_Value) isAwakeableEntryMessage_Result() {}
+
+func (*AwakeableEntryMessage_Failure) isAwakeableEntryMessage_Result() {}
+
+// Completable: No
+// Fallible: Yes
+// Type: 0x0C00 + 4
+type CompleteAwakeableEntryMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Identifier of the awakeable. See the spec for more details.
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Types that are assignable to Result:
+	//
+	//	*CompleteAwakeableEntryMessage_Value
+	//	*CompleteAwakeableEntryMessage_Failure
+	Result isCompleteAwakeableEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *CompleteAwakeableEntryMessage) Reset() {
+	*x = CompleteAwakeableEntryMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[20]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CompleteAwakeableEntryMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CompleteAwakeableEntryMessage) ProtoMessage() {}
+
+func (x *CompleteAwakeableEntryMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[20]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CompleteAwakeableEntryMessage.ProtoReflect.Descriptor instead.
+func (*CompleteAwakeableEntryMessage) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{20}
+}
+
+func (x *CompleteAwakeableEntryMessage) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (m *CompleteAwakeableEntryMessage) GetResult() isCompleteAwakeableEntryMessage_Result {
+	if m != nil {
+		return m.Result
+	}
+	return nil
+}
+
+func (x *CompleteAwakeableEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*CompleteAwakeableEntryMessage_Value); ok {
+		return x.Value
+	}
+	return nil
+}
+
+func (x *CompleteAwakeableEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*CompleteAwakeableEntryMessage_Failure); ok {
+		return x.Failure
+	}
+	return nil
+}
+
+func (x *CompleteAwakeableEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
 }
 
-type isAwakeableEntryMessage_Result interface {
-	isAwakeableEntryMessage_Result()
+type isCompleteAwakeableEntryMessage_Result interface {
+	isCompleteAwakeableEntryMessage_Result()
 }
 
-type AwakeableEntryMessage_Value struct {
+type CompleteAwakeableEntryMessage_Value struct {
 	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
 }
 
-type AwakeableEntryMessage_Failure struct {
+type CompleteAwakeableEntryMessage_Failure struct {
 	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
 }
 
-func (*AwakeableEntryMessage_Value) isAwakeableEntryMessage_Result() {}
+func (*CompleteAwakeableEntryMessage_Value) isCompleteAwakeableEntryMessage_Result() {}
 
-func (*AwakeableEntryMessage_Failure) isAwakeableEntryMessage_Result() {}
+func (*CompleteAwakeableEntryMessage_Failure) isCompleteAwakeableEntryMessage_Result() {}
 
 // Completable: No
-// Fallible: Yes
-// Type: 0x0C00 + 4
-type CompleteAwakeableEntryMessage struct {
+// Fallible: No
+// Type: 0x0C00 + 5
+// Flag: RequiresRuntimeAck
+type RunEntryMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Identifier of the awakeable. See the spec for more details.
-	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 	// Types that are assignable to Result:
 	//
-	//	*CompleteAwakeableEntryMessage_Value
-	//	*CompleteAwakeableEntryMessage_Failure
-	Result isCompleteAwakeableEntryMessage_Result `protobuf_oneof:"result"`
+	//	*RunEntryMessage_Value
+	//	*RunEntryMessage_Failure
+	Result isRunEntryMessage_Result `protobuf_oneof:"result"`
+	// Entry name
+	Name string `protobuf:"bytes,12,opt,name=name,proto3" json:"name,omitempty"`
 }
 
-func (x *CompleteAwakeableEntryMessage) Reset() {
-	*x = CompleteAwakeableEntryMessage{}
+func (x *RunEntryMessage) Reset() {
+	*x = RunEntryMessage{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_protocol_protocol_proto_msgTypes[17]
+		mi := &file_proto_protocol_protocol_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *CompleteAwakeableEntryMessage) String() string {
+func (x *RunEntryMessage) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*CompleteAwakeableEntryMessage) ProtoMessage() {}
+func (*RunEntryMessage) ProtoMessage() {}
 
-func (x *CompleteAwakeableEntryMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_protocol_protocol_proto_msgTypes[17]
+func (x *RunEntryMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1355,68 +2004,63 @@ func (x *CompleteAwakeableEntryMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use CompleteAwakeableEntryMessage.ProtoReflect.Descriptor instead.
-func (*CompleteAwakeableEntryMessage) Descriptor() ([]byte, []int) {
-	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{17}
-}
-
-func (x *CompleteAwakeableEntryMessage) GetId() string {
-	if x != nil {
-		return x.Id
-	}
-	return ""
+// Deprecated: Use RunEntryMessage.ProtoReflect.Descriptor instead.
+func (*RunEntryMessage) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{21}
 }
 
-func (m *CompleteAwakeableEntryMessage) GetResult() isCompleteAwakeableEntryMessage_Result {
+func (m *RunEntryMessage) GetResult() isRunEntryMessage_Result {
 	if m != nil {
 		return m.Result
 	}
 	return nil
 }
 
-func (x *CompleteAwakeableEntryMessage) GetValue() []byte {
-	if x, ok := x.GetResult().(*CompleteAwakeableEntryMessage_Value); ok {
+func (x *RunEntryMessage) GetValue() []byte {
+	if x, ok := x.GetResult().(*RunEntryMessage_Value); ok {
 		return x.Value
 	}
 	return nil
 }
 
-func (x *CompleteAwakeableEntryMessage) GetFailure() *Failure {
-	if x, ok := x.GetResult().(*CompleteAwakeableEntryMessage_Failure); ok {
+func (x *RunEntryMessage) GetFailure() *Failure {
+	if x, ok := x.GetResult().(*RunEntryMessage_Failure); ok {
 		return x.Failure
 	}
 	return nil
 }
 
-type isCompleteAwakeableEntryMessage_Result interface {
-	isCompleteAwakeableEntryMessage_Result()
+func (x *RunEntryMessage) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
 }
 
-type CompleteAwakeableEntryMessage_Value struct {
-	Value []byte `protobuf:"bytes,5,opt,name=value,proto3,oneof"`
+type isRunEntryMessage_Result interface {
+	isRunEntryMessage_Result()
 }
 
-type CompleteAwakeableEntryMessage_Failure struct {
-	Failure *Failure `protobuf:"bytes,6,opt,name=failure,proto3,oneof"`
+type RunEntryMessage_Value struct {
+	Value []byte `protobuf:"bytes,14,opt,name=value,proto3,oneof"`
 }
 
-func (*CompleteAwakeableEntryMessage_Value) isCompleteAwakeableEntryMessage_Result() {}
+type RunEntryMessage_Failure struct {
+	Failure *Failure `protobuf:"bytes,15,opt,name=failure,proto3,oneof"`
+}
 
-func (*CompleteAwakeableEntryMessage_Failure) isCompleteAwakeableEntryMessage_Result() {}
+func (*RunEntryMessage_Value) isRunEntryMessage_Result() {}
+
+func (*RunEntryMessage_Failure) isRunEntryMessage_Result() {}
 
 // This failure object carries user visible errors,
-// e.g. invocation failure return value or failure result of an
-// InvokeEntryMessage.
+// e.g. invocation failure return value or failure result of an InvokeEntryMessage.
 type Failure struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The code should be any of the gRPC error codes,
-	// as defined here:
-	// https://github.com/grpc/grpc/blob/master/doc/statuscodes.md#status-codes-and-their-use-in-grpc
-	//
-	// If code > 16, the runtime will interpret it as code 2 (UNKNOWN).
+	// The code can be any HTTP status code, as described https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml.
 	Code uint32 `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
 	// Contains a concise error message, e.g. Throwable#getMessage() in Java.
 	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
@@ -1425,7 +2069,7 @@ type Failure struct {
 func (x *Failure) Reset() {
 	*x = Failure{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_protocol_protocol_proto_msgTypes[18]
+		mi := &file_proto_protocol_protocol_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1438,7 +2082,7 @@ func (x *Failure) String() string {
 func (*Failure) ProtoMessage() {}
 
 func (x *Failure) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_protocol_protocol_proto_msgTypes[18]
+	mi := &file_proto_protocol_protocol_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1451,7 +2095,7 @@ func (x *Failure) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Failure.ProtoReflect.Descriptor instead.
 func (*Failure) Descriptor() ([]byte, []int) {
-	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{18}
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{22}
 }
 
 func (x *Failure) GetCode() uint32 {
@@ -1468,6 +2112,99 @@ func (x *Failure) GetMessage() string {
 	return ""
 }
 
+type Header struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key   string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *Header) Reset() {
+	*x = Header{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[23]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Header) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Header) ProtoMessage() {}
+
+func (x *Header) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[23]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Header.ProtoReflect.Descriptor instead.
+func (*Header) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{23}
+}
+
+func (x *Header) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (x *Header) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+type Empty struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_protocol_protocol_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_protocol_protocol_proto_msgTypes[24]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_proto_protocol_protocol_proto_rawDescGZIP(), []int{24}
+}
+
 type StartMessage_StateEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1482,7 +2219,7 @@ type StartMessage_StateEntry struct {
 func (x *StartMessage_StateEntry) Reset() {
 	*x = StartMessage_StateEntry{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_protocol_protocol_proto_msgTypes[19]
+		mi := &file_proto_protocol_protocol_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1495,7 +2232,7 @@ func (x *StartMessage_StateEntry) String() string {
 func (*StartMessage_StateEntry) ProtoMessage() {}
 
 func (x *StartMessage_StateEntry) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_protocol_protocol_proto_msgTypes[19]
+	mi := &file_proto_protocol_protocol_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1536,7 +2273,7 @@ type GetStateKeysEntryMessage_StateKeys struct {
 func (x *GetStateKeysEntryMessage_StateKeys) Reset() {
 	*x = GetStateKeysEntryMessage_StateKeys{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_protocol_protocol_proto_msgTypes[20]
+		mi := &file_proto_protocol_protocol_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1549,7 +2286,7 @@ func (x *GetStateKeysEntryMessage_StateKeys) String() string {
 func (*GetStateKeysEntryMessage_StateKeys) ProtoMessage() {}
 
 func (x *GetStateKeysEntryMessage_StateKeys) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_protocol_protocol_proto_msgTypes[20]
+	mi := &file_proto_protocol_protocol_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1578,177 +2315,280 @@ var file_proto_protocol_protocol_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1763,51 +2603,67 @@ func file_proto_protocol_protocol_proto_rawDescGZIP() []byte {
 	return file_proto_protocol_protocol_proto_rawDescData
 }
 
-var file_proto_protocol_protocol_proto_msgTypes = make([]protoimpl.MessageInfo, 21)
+var file_proto_protocol_protocol_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_proto_protocol_protocol_proto_msgTypes = make([]protoimpl.MessageInfo, 27)
 var file_proto_protocol_protocol_proto_goTypes = []interface{}{
-	(*StartMessage)(nil),                       // 0: dev.restate.service.protocol.StartMessage
-	(*CompletionMessage)(nil),                  // 1: dev.restate.service.protocol.CompletionMessage
-	(*SuspensionMessage)(nil),                  // 2: dev.restate.service.protocol.SuspensionMessage
-	(*ErrorMessage)(nil),                       // 3: dev.restate.service.protocol.ErrorMessage
-	(*EntryAckMessage)(nil),                    // 4: dev.restate.service.protocol.EntryAckMessage
-	(*EndMessage)(nil),                         // 5: dev.restate.service.protocol.EndMessage
-	(*PollInputStreamEntryMessage)(nil),        // 6: dev.restate.service.protocol.PollInputStreamEntryMessage
-	(*OutputStreamEntryMessage)(nil),           // 7: dev.restate.service.protocol.OutputStreamEntryMessage
-	(*GetStateEntryMessage)(nil),               // 8: dev.restate.service.protocol.GetStateEntryMessage
-	(*SetStateEntryMessage)(nil),               // 9: dev.restate.service.protocol.SetStateEntryMessage
-	(*ClearStateEntryMessage)(nil),             // 10: dev.restate.service.protocol.ClearStateEntryMessage
-	(*ClearAllStateEntryMessage)(nil),          // 11: dev.restate.service.protocol.ClearAllStateEntryMessage
-	(*GetStateKeysEntryMessage)(nil),           // 12: dev.restate.service.protocol.GetStateKeysEntryMessage
-	(*SleepEntryMessage)(nil),                  // 13: dev.restate.service.protocol.SleepEntryMessage
-	(*InvokeEntryMessage)(nil),                 // 14: dev.restate.service.protocol.InvokeEntryMessage
-	(*BackgroundInvokeEntryMessage)(nil),       // 15: dev.restate.service.protocol.BackgroundInvokeEntryMessage
-	(*AwakeableEntryMessage)(nil),              // 16: dev.restate.service.protocol.AwakeableEntryMessage
-	(*CompleteAwakeableEntryMessage)(nil),      // 17: dev.restate.service.protocol.CompleteAwakeableEntryMessage
-	(*Failure)(nil),                            // 18: dev.restate.service.protocol.Failure
-	(*StartMessage_StateEntry)(nil),            // 19: dev.restate.service.protocol.StartMessage.StateEntry
-	(*GetStateKeysEntryMessage_StateKeys)(nil), // 20: dev.restate.service.protocol.GetStateKeysEntryMessage.StateKeys
-	(*emptypb.Empty)(nil),                      // 21: google.protobuf.Empty
+	(ServiceProtocolVersion)(0),                // 0: dev.restate.service.protocol.ServiceProtocolVersion
+	(*StartMessage)(nil),                       // 1: dev.restate.service.protocol.StartMessage
+	(*CompletionMessage)(nil),                  // 2: dev.restate.service.protocol.CompletionMessage
+	(*SuspensionMessage)(nil),                  // 3: dev.restate.service.protocol.SuspensionMessage
+	(*ErrorMessage)(nil),                       // 4: dev.restate.service.protocol.ErrorMessage
+	(*EntryAckMessage)(nil),                    // 5: dev.restate.service.protocol.EntryAckMessage
+	(*EndMessage)(nil),                         // 6: dev.restate.service.protocol.EndMessage
+	(*InputEntryMessage)(nil),                  // 7: dev.restate.service.protocol.InputEntryMessage
+	(*OutputEntryMessage)(nil),                 // 8: dev.restate.service.protocol.OutputEntryMessage
+	(*GetStateEntryMessage)(nil),               // 9: dev.restate.service.protocol.GetStateEntryMessage
+	(*SetStateEntryMessage)(nil),               // 10: dev.restate.service.protocol.SetStateEntryMessage
+	(*ClearStateEntryMessage)(nil),             // 11: dev.restate.service.protocol.ClearStateEntryMessage
+	(*ClearAllStateEntryMessage)(nil),          // 12: dev.restate.service.protocol.ClearAllStateEntryMessage
+	(*GetStateKeysEntryMessage)(nil),           // 13: dev.restate.service.protocol.GetStateKeysEntryMessage
+	(*GetPromiseEntryMessage)(nil),             // 14: dev.restate.service.protocol.GetPromiseEntryMessage
+	(*PeekPromiseEntryMessage)(nil),            // 15: dev.restate.service.protocol.PeekPromiseEntryMessage
+	(*CompletePromiseEntryMessage)(nil),        // 16: dev.restate.service.protocol.CompletePromiseEntryMessage
+	(*SleepEntryMessage)(nil),                  // 17: dev.restate.service.protocol.SleepEntryMessage
+	(*CallEntryMessage)(nil),                   // 18: dev.restate.service.protocol.CallEntryMessage
+	(*OneWayCallEntryMessage)(nil),             // 19: dev.restate.service.protocol.OneWayCallEntryMessage
+	(*AwakeableEntryMessage)(nil),              // 20: dev.restate.service.protocol.AwakeableEntryMessage
+	(*CompleteAwakeableEntryMessage)(nil),      // 21: dev.restate.service.protocol.CompleteAwakeableEntryMessage
+	(*RunEntryMessage)(nil),                    // 22: dev.restate.service.protocol.RunEntryMessage
+	(*Failure)(nil),                            // 23: dev.restate.service.protocol.Failure
+	(*Header)(nil),                             // 24: dev.restate.service.protocol.Header
+	(*Empty)(nil),                              // 25: dev.restate.service.protocol.Empty
+	(*StartMessage_StateEntry)(nil),            // 26: dev.restate.service.protocol.StartMessage.StateEntry
+	(*GetStateKeysEntryMessage_StateKeys)(nil), // 27: dev.restate.service.protocol.GetStateKeysEntryMessage.StateKeys
 }
 var file_proto_protocol_protocol_proto_depIdxs = []int32{
-	19, // 0: dev.restate.service.protocol.StartMessage.state_map:type_name -> dev.restate.service.protocol.StartMessage.StateEntry
-	21, // 1: dev.restate.service.protocol.CompletionMessage.empty:type_name -> google.protobuf.Empty
-	18, // 2: dev.restate.service.protocol.CompletionMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	18, // 3: dev.restate.service.protocol.PollInputStreamEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	18, // 4: dev.restate.service.protocol.OutputStreamEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	21, // 5: dev.restate.service.protocol.GetStateEntryMessage.empty:type_name -> google.protobuf.Empty
-	18, // 6: dev.restate.service.protocol.GetStateEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	20, // 7: dev.restate.service.protocol.GetStateKeysEntryMessage.value:type_name -> dev.restate.service.protocol.GetStateKeysEntryMessage.StateKeys
-	18, // 8: dev.restate.service.protocol.GetStateKeysEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	21, // 9: dev.restate.service.protocol.SleepEntryMessage.empty:type_name -> google.protobuf.Empty
-	18, // 10: dev.restate.service.protocol.SleepEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	18, // 11: dev.restate.service.protocol.InvokeEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	18, // 12: dev.restate.service.protocol.AwakeableEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	18, // 13: dev.restate.service.protocol.CompleteAwakeableEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
-	14, // [14:14] is the sub-list for method output_type
-	14, // [14:14] is the sub-list for method input_type
-	14, // [14:14] is the sub-list for extension type_name
-	14, // [14:14] is the sub-list for extension extendee
-	0,  // [0:14] is the sub-list for field type_name
+	26, // 0: dev.restate.service.protocol.StartMessage.state_map:type_name -> dev.restate.service.protocol.StartMessage.StateEntry
+	25, // 1: dev.restate.service.protocol.CompletionMessage.empty:type_name -> dev.restate.service.protocol.Empty
+	23, // 2: dev.restate.service.protocol.CompletionMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	24, // 3: dev.restate.service.protocol.InputEntryMessage.headers:type_name -> dev.restate.service.protocol.Header
+	23, // 4: dev.restate.service.protocol.OutputEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	25, // 5: dev.restate.service.protocol.GetStateEntryMessage.empty:type_name -> dev.restate.service.protocol.Empty
+	23, // 6: dev.restate.service.protocol.GetStateEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	27, // 7: dev.restate.service.protocol.GetStateKeysEntryMessage.value:type_name -> dev.restate.service.protocol.GetStateKeysEntryMessage.StateKeys
+	23, // 8: dev.restate.service.protocol.GetStateKeysEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	23, // 9: dev.restate.service.protocol.GetPromiseEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	25, // 10: dev.restate.service.protocol.PeekPromiseEntryMessage.empty:type_name -> dev.restate.service.protocol.Empty
+	23, // 11: dev.restate.service.protocol.PeekPromiseEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	23, // 12: dev.restate.service.protocol.CompletePromiseEntryMessage.completion_failure:type_name -> dev.restate.service.protocol.Failure
+	25, // 13: dev.restate.service.protocol.CompletePromiseEntryMessage.empty:type_name -> dev.restate.service.protocol.Empty
+	23, // 14: dev.restate.service.protocol.CompletePromiseEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	25, // 15: dev.restate.service.protocol.SleepEntryMessage.empty:type_name -> dev.restate.service.protocol.Empty
+	23, // 16: dev.restate.service.protocol.SleepEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	24, // 17: dev.restate.service.protocol.CallEntryMessage.headers:type_name -> dev.restate.service.protocol.Header
+	23, // 18: dev.restate.service.protocol.CallEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	24, // 19: dev.restate.service.protocol.OneWayCallEntryMessage.headers:type_name -> dev.restate.service.protocol.Header
+	23, // 20: dev.restate.service.protocol.AwakeableEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	23, // 21: dev.restate.service.protocol.CompleteAwakeableEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	23, // 22: dev.restate.service.protocol.RunEntryMessage.failure:type_name -> dev.restate.service.protocol.Failure
+	23, // [23:23] is the sub-list for method output_type
+	23, // [23:23] is the sub-list for method input_type
+	23, // [23:23] is the sub-list for extension type_name
+	23, // [23:23] is the sub-list for extension extendee
+	0,  // [0:23] is the sub-list for field type_name
 }
 
 func init() { file_proto_protocol_protocol_proto_init() }
@@ -1889,7 +2745,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PollInputStreamEntryMessage); i {
+			switch v := v.(*InputEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1901,7 +2757,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*OutputStreamEntryMessage); i {
+			switch v := v.(*OutputEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1973,7 +2829,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SleepEntryMessage); i {
+			switch v := v.(*GetPromiseEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1985,7 +2841,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*InvokeEntryMessage); i {
+			switch v := v.(*PeekPromiseEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1997,7 +2853,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*BackgroundInvokeEntryMessage); i {
+			switch v := v.(*CompletePromiseEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2009,7 +2865,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AwakeableEntryMessage); i {
+			switch v := v.(*SleepEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2021,7 +2877,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CompleteAwakeableEntryMessage); i {
+			switch v := v.(*CallEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2033,7 +2889,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Failure); i {
+			switch v := v.(*OneWayCallEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2045,7 +2901,7 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StartMessage_StateEntry); i {
+			switch v := v.(*AwakeableEntryMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2057,6 +2913,78 @@ func file_proto_protocol_protocol_proto_init() {
 			}
 		}
 		file_proto_protocol_protocol_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CompleteAwakeableEntryMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RunEntryMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Failure); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Header); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Empty); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StartMessage_StateEntry); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_protocol_protocol_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*GetStateKeysEntryMessage_StateKeys); i {
 			case 0:
 				return &v.state
@@ -2074,13 +3002,10 @@ func file_proto_protocol_protocol_proto_init() {
 		(*CompletionMessage_Value)(nil),
 		(*CompletionMessage_Failure)(nil),
 	}
-	file_proto_protocol_protocol_proto_msgTypes[6].OneofWrappers = []interface{}{
-		(*PollInputStreamEntryMessage_Value)(nil),
-		(*PollInputStreamEntryMessage_Failure)(nil),
-	}
+	file_proto_protocol_protocol_proto_msgTypes[3].OneofWrappers = []interface{}{}
 	file_proto_protocol_protocol_proto_msgTypes[7].OneofWrappers = []interface{}{
-		(*OutputStreamEntryMessage_Value)(nil),
-		(*OutputStreamEntryMessage_Failure)(nil),
+		(*OutputEntryMessage_Value)(nil),
+		(*OutputEntryMessage_Failure)(nil),
 	}
 	file_proto_protocol_protocol_proto_msgTypes[8].OneofWrappers = []interface{}{
 		(*GetStateEntryMessage_Empty)(nil),
@@ -2092,33 +3017,53 @@ func file_proto_protocol_protocol_proto_init() {
 		(*GetStateKeysEntryMessage_Failure)(nil),
 	}
 	file_proto_protocol_protocol_proto_msgTypes[13].OneofWrappers = []interface{}{
-		(*SleepEntryMessage_Empty)(nil),
-		(*SleepEntryMessage_Failure)(nil),
+		(*GetPromiseEntryMessage_Value)(nil),
+		(*GetPromiseEntryMessage_Failure)(nil),
 	}
 	file_proto_protocol_protocol_proto_msgTypes[14].OneofWrappers = []interface{}{
-		(*InvokeEntryMessage_Value)(nil),
-		(*InvokeEntryMessage_Failure)(nil),
+		(*PeekPromiseEntryMessage_Empty)(nil),
+		(*PeekPromiseEntryMessage_Value)(nil),
+		(*PeekPromiseEntryMessage_Failure)(nil),
+	}
+	file_proto_protocol_protocol_proto_msgTypes[15].OneofWrappers = []interface{}{
+		(*CompletePromiseEntryMessage_CompletionValue)(nil),
+		(*CompletePromiseEntryMessage_CompletionFailure)(nil),
+		(*CompletePromiseEntryMessage_Empty)(nil),
+		(*CompletePromiseEntryMessage_Failure)(nil),
 	}
 	file_proto_protocol_protocol_proto_msgTypes[16].OneofWrappers = []interface{}{
+		(*SleepEntryMessage_Empty)(nil),
+		(*SleepEntryMessage_Failure)(nil),
+	}
+	file_proto_protocol_protocol_proto_msgTypes[17].OneofWrappers = []interface{}{
+		(*CallEntryMessage_Value)(nil),
+		(*CallEntryMessage_Failure)(nil),
+	}
+	file_proto_protocol_protocol_proto_msgTypes[19].OneofWrappers = []interface{}{
 		(*AwakeableEntryMessage_Value)(nil),
 		(*AwakeableEntryMessage_Failure)(nil),
 	}
-	file_proto_protocol_protocol_proto_msgTypes[17].OneofWrappers = []interface{}{
+	file_proto_protocol_protocol_proto_msgTypes[20].OneofWrappers = []interface{}{
 		(*CompleteAwakeableEntryMessage_Value)(nil),
 		(*CompleteAwakeableEntryMessage_Failure)(nil),
 	}
+	file_proto_protocol_protocol_proto_msgTypes[21].OneofWrappers = []interface{}{
+		(*RunEntryMessage_Value)(nil),
+		(*RunEntryMessage_Failure)(nil),
+	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proto_protocol_protocol_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   21,
+			NumEnums:      1,
+			NumMessages:   27,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_proto_protocol_protocol_proto_goTypes,
 		DependencyIndexes: file_proto_protocol_protocol_proto_depIdxs,
+		EnumInfos:         file_proto_protocol_protocol_proto_enumTypes,
 		MessageInfos:      file_proto_protocol_protocol_proto_msgTypes,
 	}.Build()
 	File_proto_protocol_protocol_proto = out.File
diff --git a/generated/proto/services/services.pb.go b/generated/proto/services/services.pb.go
deleted file mode 100644
index f3ceaf3..0000000
--- a/generated/proto/services/services.pb.go
+++ /dev/null
@@ -1,1151 +0,0 @@
-// Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
-//
-// This file is part of the Restate service protocol, which is
-// released under the MIT license.
-//
-// You can find a copy of the license in file LICENSE in the root
-// directory of this repository or package, or at
-// https://github.com/restatedev/proto/blob/main/LICENSE
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        (unknown)
-// source: proto/services/services.proto
-
-//
-//This package contains internal service interfaces
-
-package services
-
-import (
-	_ "github.com/restatedev/sdk-go/generated/dev/restate"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	emptypb "google.golang.org/protobuf/types/known/emptypb"
-	_ "google.golang.org/protobuf/types/known/structpb"
-	reflect "reflect"
-	sync "sync"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-type StartRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// User provided operation id, this is used as idempotency key.
-	OperationId string `protobuf:"bytes,1,opt,name=operation_id,json=operationId,proto3" json:"operation_id,omitempty"`
-	// Stream id to uniquely identify a open stream between client and Restate.
-	// There can be at most one open stream at the same time.
-	StreamId string `protobuf:"bytes,2,opt,name=stream_id,json=streamId,proto3" json:"stream_id,omitempty"`
-	// Retention period for the response in seconds.
-	// After the invocation completes, the response will be persisted for the
-	// given duration. Afterwards, the system will cleanup the response and treats
-	// any subsequent invocation with same operation_id as new.
-	//
-	// If not set, 30 minutes will be used as retention period.
-	RetentionPeriodSec uint32 `protobuf:"varint,3,opt,name=retention_period_sec,json=retentionPeriodSec,proto3" json:"retention_period_sec,omitempty"`
-	// Argument of the invocation
-	Argument []byte `protobuf:"bytes,4,opt,name=argument,proto3" json:"argument,omitempty"`
-}
-
-func (x *StartRequest) Reset() {
-	*x = StartRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *StartRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StartRequest) ProtoMessage() {}
-
-func (x *StartRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StartRequest.ProtoReflect.Descriptor instead.
-func (*StartRequest) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *StartRequest) GetOperationId() string {
-	if x != nil {
-		return x.OperationId
-	}
-	return ""
-}
-
-func (x *StartRequest) GetStreamId() string {
-	if x != nil {
-		return x.StreamId
-	}
-	return ""
-}
-
-func (x *StartRequest) GetRetentionPeriodSec() uint32 {
-	if x != nil {
-		return x.RetentionPeriodSec
-	}
-	return 0
-}
-
-func (x *StartRequest) GetArgument() []byte {
-	if x != nil {
-		return x.Argument
-	}
-	return nil
-}
-
-type StartResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Types that are assignable to InvocationStatus:
-	//
-	//	*StartResponse_Executing
-	//	*StartResponse_Completed
-	InvocationStatus isStartResponse_InvocationStatus `protobuf_oneof:"invocation_status"`
-}
-
-func (x *StartResponse) Reset() {
-	*x = StartResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *StartResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*StartResponse) ProtoMessage() {}
-
-func (x *StartResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use StartResponse.ProtoReflect.Descriptor instead.
-func (*StartResponse) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{1}
-}
-
-func (m *StartResponse) GetInvocationStatus() isStartResponse_InvocationStatus {
-	if m != nil {
-		return m.InvocationStatus
-	}
-	return nil
-}
-
-func (x *StartResponse) GetExecuting() []byte {
-	if x, ok := x.GetInvocationStatus().(*StartResponse_Executing); ok {
-		return x.Executing
-	}
-	return nil
-}
-
-func (x *StartResponse) GetCompleted() *GetResultResponse {
-	if x, ok := x.GetInvocationStatus().(*StartResponse_Completed); ok {
-		return x.Completed
-	}
-	return nil
-}
-
-type isStartResponse_InvocationStatus interface {
-	isStartResponse_InvocationStatus()
-}
-
-type StartResponse_Executing struct {
-	// Contains the concatenated first messages of the stream, encoded using the
-	// same framing used by service-protocol
-	Executing []byte `protobuf:"bytes,1,opt,name=executing,proto3,oneof"`
-}
-
-type StartResponse_Completed struct {
-	// Contains the result of the invocation
-	Completed *GetResultResponse `protobuf:"bytes,2,opt,name=completed,proto3,oneof"`
-}
-
-func (*StartResponse_Executing) isStartResponse_InvocationStatus() {}
-
-func (*StartResponse_Completed) isStartResponse_InvocationStatus() {}
-
-type SendRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// User provided operation id, this is used as idempotency key.
-	OperationId string `protobuf:"bytes,1,opt,name=operation_id,json=operationId,proto3" json:"operation_id,omitempty"`
-	// Stream id to uniquely identify a open stream between client and Restate.
-	// There can be at most one open stream at the same time.
-	StreamId string `protobuf:"bytes,2,opt,name=stream_id,json=streamId,proto3" json:"stream_id,omitempty"`
-	// Contains the concatenated messages of the stream, encoded using the same
-	// framing used by service-protocol
-	Messages []byte `protobuf:"bytes,3,opt,name=messages,proto3" json:"messages,omitempty"`
-}
-
-func (x *SendRequest) Reset() {
-	*x = SendRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SendRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SendRequest) ProtoMessage() {}
-
-func (x *SendRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use SendRequest.ProtoReflect.Descriptor instead.
-func (*SendRequest) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *SendRequest) GetOperationId() string {
-	if x != nil {
-		return x.OperationId
-	}
-	return ""
-}
-
-func (x *SendRequest) GetStreamId() string {
-	if x != nil {
-		return x.StreamId
-	}
-	return ""
-}
-
-func (x *SendRequest) GetMessages() []byte {
-	if x != nil {
-		return x.Messages
-	}
-	return nil
-}
-
-type SendResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Types that are assignable to Response:
-	//
-	//	*SendResponse_Ok
-	//	*SendResponse_InvalidStream
-	//	*SendResponse_InvocationCompleted
-	Response isSendResponse_Response `protobuf_oneof:"response"`
-}
-
-func (x *SendResponse) Reset() {
-	*x = SendResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SendResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SendResponse) ProtoMessage() {}
-
-func (x *SendResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use SendResponse.ProtoReflect.Descriptor instead.
-func (*SendResponse) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{3}
-}
-
-func (m *SendResponse) GetResponse() isSendResponse_Response {
-	if m != nil {
-		return m.Response
-	}
-	return nil
-}
-
-func (x *SendResponse) GetOk() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*SendResponse_Ok); ok {
-		return x.Ok
-	}
-	return nil
-}
-
-func (x *SendResponse) GetInvalidStream() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*SendResponse_InvalidStream); ok {
-		return x.InvalidStream
-	}
-	return nil
-}
-
-func (x *SendResponse) GetInvocationCompleted() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*SendResponse_InvocationCompleted); ok {
-		return x.InvocationCompleted
-	}
-	return nil
-}
-
-type isSendResponse_Response interface {
-	isSendResponse_Response()
-}
-
-type SendResponse_Ok struct {
-	Ok *emptypb.Empty `protobuf:"bytes,1,opt,name=ok,proto3,oneof"`
-}
-
-type SendResponse_InvalidStream struct {
-	// This means the provided stream_id is invalid, and it should not be
-	// reused, nor the client should create a new stream using Start(). The
-	// client can instead read the invocation result using GetResult().
-	InvalidStream *emptypb.Empty `protobuf:"bytes,2,opt,name=invalid_stream,json=invalidStream,proto3,oneof"`
-}
-
-type SendResponse_InvocationCompleted struct {
-	// This means the invocation is completed, and the result should be
-	// collected using GetResult
-	InvocationCompleted *emptypb.Empty `protobuf:"bytes,3,opt,name=invocation_completed,json=invocationCompleted,proto3,oneof"`
-}
-
-func (*SendResponse_Ok) isSendResponse_Response() {}
-
-func (*SendResponse_InvalidStream) isSendResponse_Response() {}
-
-func (*SendResponse_InvocationCompleted) isSendResponse_Response() {}
-
-type RecvRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// User provided operation id, this is used as idempotency key.
-	OperationId string `protobuf:"bytes,1,opt,name=operation_id,json=operationId,proto3" json:"operation_id,omitempty"`
-	// Stream id to uniquely identify a open stream between client and Restate.
-	// There can be at most one open stream at the same time.
-	StreamId string `protobuf:"bytes,2,opt,name=stream_id,json=streamId,proto3" json:"stream_id,omitempty"`
-}
-
-func (x *RecvRequest) Reset() {
-	*x = RecvRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[4]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RecvRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RecvRequest) ProtoMessage() {}
-
-func (x *RecvRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[4]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RecvRequest.ProtoReflect.Descriptor instead.
-func (*RecvRequest) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{4}
-}
-
-func (x *RecvRequest) GetOperationId() string {
-	if x != nil {
-		return x.OperationId
-	}
-	return ""
-}
-
-func (x *RecvRequest) GetStreamId() string {
-	if x != nil {
-		return x.StreamId
-	}
-	return ""
-}
-
-type RecvResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Types that are assignable to Response:
-	//
-	//	*RecvResponse_Messages
-	//	*RecvResponse_InvalidStream
-	//	*RecvResponse_InvocationCompleted
-	Response isRecvResponse_Response `protobuf_oneof:"response"`
-}
-
-func (x *RecvResponse) Reset() {
-	*x = RecvResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[5]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RecvResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RecvResponse) ProtoMessage() {}
-
-func (x *RecvResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[5]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RecvResponse.ProtoReflect.Descriptor instead.
-func (*RecvResponse) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{5}
-}
-
-func (m *RecvResponse) GetResponse() isRecvResponse_Response {
-	if m != nil {
-		return m.Response
-	}
-	return nil
-}
-
-func (x *RecvResponse) GetMessages() []byte {
-	if x, ok := x.GetResponse().(*RecvResponse_Messages); ok {
-		return x.Messages
-	}
-	return nil
-}
-
-func (x *RecvResponse) GetInvalidStream() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*RecvResponse_InvalidStream); ok {
-		return x.InvalidStream
-	}
-	return nil
-}
-
-func (x *RecvResponse) GetInvocationCompleted() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*RecvResponse_InvocationCompleted); ok {
-		return x.InvocationCompleted
-	}
-	return nil
-}
-
-type isRecvResponse_Response interface {
-	isRecvResponse_Response()
-}
-
-type RecvResponse_Messages struct {
-	// Contains the concatenated messages of the stream, encoded using the same
-	// framing used by service-protocol
-	Messages []byte `protobuf:"bytes,1,opt,name=messages,proto3,oneof"`
-}
-
-type RecvResponse_InvalidStream struct {
-	// This means the provided stream_id is invalid, and it should not be
-	// reused, nor the client should create a new stream using Start(). The
-	// client can instead read the invocation result using GetResult().
-	InvalidStream *emptypb.Empty `protobuf:"bytes,2,opt,name=invalid_stream,json=invalidStream,proto3,oneof"`
-}
-
-type RecvResponse_InvocationCompleted struct {
-	// This means the invocation is completed, and the result should be
-	// collected using GetResult
-	InvocationCompleted *emptypb.Empty `protobuf:"bytes,3,opt,name=invocation_completed,json=invocationCompleted,proto3,oneof"`
-}
-
-func (*RecvResponse_Messages) isRecvResponse_Response() {}
-
-func (*RecvResponse_InvalidStream) isRecvResponse_Response() {}
-
-func (*RecvResponse_InvocationCompleted) isRecvResponse_Response() {}
-
-type GetResultRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// User provided operation id, this is used as idempotency key.
-	OperationId string `protobuf:"bytes,1,opt,name=operation_id,json=operationId,proto3" json:"operation_id,omitempty"`
-}
-
-func (x *GetResultRequest) Reset() {
-	*x = GetResultRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[6]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *GetResultRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*GetResultRequest) ProtoMessage() {}
-
-func (x *GetResultRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[6]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use GetResultRequest.ProtoReflect.Descriptor instead.
-func (*GetResultRequest) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{6}
-}
-
-func (x *GetResultRequest) GetOperationId() string {
-	if x != nil {
-		return x.OperationId
-	}
-	return ""
-}
-
-type GetResultResponse struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Types that are assignable to Response:
-	//
-	//	*GetResultResponse_None
-	//	*GetResultResponse_Success
-	//	*GetResultResponse_Failure
-	Response isGetResultResponse_Response `protobuf_oneof:"response"`
-	// Timestamp of the response expiry time in RFC3339.
-	// Empty if response = none
-	ExpiryTime string `protobuf:"bytes,15,opt,name=expiry_time,json=expiryTime,proto3" json:"expiry_time,omitempty"`
-}
-
-func (x *GetResultResponse) Reset() {
-	*x = GetResultResponse{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[7]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *GetResultResponse) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*GetResultResponse) ProtoMessage() {}
-
-func (x *GetResultResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[7]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use GetResultResponse.ProtoReflect.Descriptor instead.
-func (*GetResultResponse) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{7}
-}
-
-func (m *GetResultResponse) GetResponse() isGetResultResponse_Response {
-	if m != nil {
-		return m.Response
-	}
-	return nil
-}
-
-func (x *GetResultResponse) GetNone() *emptypb.Empty {
-	if x, ok := x.GetResponse().(*GetResultResponse_None); ok {
-		return x.None
-	}
-	return nil
-}
-
-func (x *GetResultResponse) GetSuccess() []byte {
-	if x, ok := x.GetResponse().(*GetResultResponse_Success); ok {
-		return x.Success
-	}
-	return nil
-}
-
-func (x *GetResultResponse) GetFailure() *GetResultResponse_InvocationFailure {
-	if x, ok := x.GetResponse().(*GetResultResponse_Failure); ok {
-		return x.Failure
-	}
-	return nil
-}
-
-func (x *GetResultResponse) GetExpiryTime() string {
-	if x != nil {
-		return x.ExpiryTime
-	}
-	return ""
-}
-
-type isGetResultResponse_Response interface {
-	isGetResultResponse_Response()
-}
-
-type GetResultResponse_None struct {
-	// See GetResult documentation
-	None *emptypb.Empty `protobuf:"bytes,1,opt,name=none,proto3,oneof"`
-}
-
-type GetResultResponse_Success struct {
-	Success []byte `protobuf:"bytes,2,opt,name=success,proto3,oneof"`
-}
-
-type GetResultResponse_Failure struct {
-	Failure *GetResultResponse_InvocationFailure `protobuf:"bytes,3,opt,name=failure,proto3,oneof"`
-}
-
-func (*GetResultResponse_None) isGetResultResponse_Response() {}
-
-func (*GetResultResponse_Success) isGetResultResponse_Response() {}
-
-func (*GetResultResponse_Failure) isGetResultResponse_Response() {}
-
-type CleanupRequest struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// User provided operation id, this is used as idempotency key.
-	OperationId string `protobuf:"bytes,1,opt,name=operation_id,json=operationId,proto3" json:"operation_id,omitempty"`
-}
-
-func (x *CleanupRequest) Reset() {
-	*x = CleanupRequest{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[8]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *CleanupRequest) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*CleanupRequest) ProtoMessage() {}
-
-func (x *CleanupRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[8]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use CleanupRequest.ProtoReflect.Descriptor instead.
-func (*CleanupRequest) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{8}
-}
-
-func (x *CleanupRequest) GetOperationId() string {
-	if x != nil {
-		return x.OperationId
-	}
-	return ""
-}
-
-type GetResultResponse_InvocationFailure struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Code    uint32 `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
-	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
-}
-
-func (x *GetResultResponse_InvocationFailure) Reset() {
-	*x = GetResultResponse_InvocationFailure{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_proto_services_services_proto_msgTypes[9]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *GetResultResponse_InvocationFailure) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*GetResultResponse_InvocationFailure) ProtoMessage() {}
-
-func (x *GetResultResponse_InvocationFailure) ProtoReflect() protoreflect.Message {
-	mi := &file_proto_services_services_proto_msgTypes[9]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use GetResultResponse_InvocationFailure.ProtoReflect.Descriptor instead.
-func (*GetResultResponse_InvocationFailure) Descriptor() ([]byte, []int) {
-	return file_proto_services_services_proto_rawDescGZIP(), []int{7, 0}
-}
-
-func (x *GetResultResponse_InvocationFailure) GetCode() uint32 {
-	if x != nil {
-		return x.Code
-	}
-	return 0
-}
-
-func (x *GetResultResponse_InvocationFailure) GetMessage() string {
-	if x != nil {
-		return x.Message
-	}
-	return ""
-}
-
-var File_proto_services_services_proto protoreflect.FileDescriptor
-
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-	0x76, 0x2e, 0x52, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63,
-	0x65, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0xca, 0x02, 0x1c, 0x44, 0x65, 0x76,
-	0x5c, 0x52, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x5c, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65,
-	0x5c, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0xe2, 0x02, 0x28, 0x44, 0x65, 0x76, 0x5c,
-	0x52, 0x65, 0x73, 0x74, 0x61, 0x74, 0x65, 0x5c, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x5c,
-	0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61,
-	0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x1f, 0x44, 0x65, 0x76, 0x3a, 0x3a, 0x52, 0x65, 0x73, 0x74,
-	0x61, 0x74, 0x65, 0x3a, 0x3a, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x3a, 0x3a, 0x53, 0x65,
-	0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_proto_services_services_proto_rawDescOnce sync.Once
-	file_proto_services_services_proto_rawDescData = file_proto_services_services_proto_rawDesc
-)
-
-func file_proto_services_services_proto_rawDescGZIP() []byte {
-	file_proto_services_services_proto_rawDescOnce.Do(func() {
-		file_proto_services_services_proto_rawDescData = protoimpl.X.CompressGZIP(file_proto_services_services_proto_rawDescData)
-	})
-	return file_proto_services_services_proto_rawDescData
-}
-
-var file_proto_services_services_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
-var file_proto_services_services_proto_goTypes = []interface{}{
-	(*StartRequest)(nil),                        // 0: dev.restate.service.services.StartRequest
-	(*StartResponse)(nil),                       // 1: dev.restate.service.services.StartResponse
-	(*SendRequest)(nil),                         // 2: dev.restate.service.services.SendRequest
-	(*SendResponse)(nil),                        // 3: dev.restate.service.services.SendResponse
-	(*RecvRequest)(nil),                         // 4: dev.restate.service.services.RecvRequest
-	(*RecvResponse)(nil),                        // 5: dev.restate.service.services.RecvResponse
-	(*GetResultRequest)(nil),                    // 6: dev.restate.service.services.GetResultRequest
-	(*GetResultResponse)(nil),                   // 7: dev.restate.service.services.GetResultResponse
-	(*CleanupRequest)(nil),                      // 8: dev.restate.service.services.CleanupRequest
-	(*GetResultResponse_InvocationFailure)(nil), // 9: dev.restate.service.services.GetResultResponse.InvocationFailure
-	(*emptypb.Empty)(nil),                       // 10: google.protobuf.Empty
-}
-var file_proto_services_services_proto_depIdxs = []int32{
-	7,  // 0: dev.restate.service.services.StartResponse.completed:type_name -> dev.restate.service.services.GetResultResponse
-	10, // 1: dev.restate.service.services.SendResponse.ok:type_name -> google.protobuf.Empty
-	10, // 2: dev.restate.service.services.SendResponse.invalid_stream:type_name -> google.protobuf.Empty
-	10, // 3: dev.restate.service.services.SendResponse.invocation_completed:type_name -> google.protobuf.Empty
-	10, // 4: dev.restate.service.services.RecvResponse.invalid_stream:type_name -> google.protobuf.Empty
-	10, // 5: dev.restate.service.services.RecvResponse.invocation_completed:type_name -> google.protobuf.Empty
-	10, // 6: dev.restate.service.services.GetResultResponse.none:type_name -> google.protobuf.Empty
-	9,  // 7: dev.restate.service.services.GetResultResponse.failure:type_name -> dev.restate.service.services.GetResultResponse.InvocationFailure
-	0,  // 8: dev.restate.service.services.RemoteContext.Start:input_type -> dev.restate.service.services.StartRequest
-	2,  // 9: dev.restate.service.services.RemoteContext.Send:input_type -> dev.restate.service.services.SendRequest
-	4,  // 10: dev.restate.service.services.RemoteContext.Recv:input_type -> dev.restate.service.services.RecvRequest
-	6,  // 11: dev.restate.service.services.RemoteContext.GetResult:input_type -> dev.restate.service.services.GetResultRequest
-	8,  // 12: dev.restate.service.services.RemoteContext.Cleanup:input_type -> dev.restate.service.services.CleanupRequest
-	1,  // 13: dev.restate.service.services.RemoteContext.Start:output_type -> dev.restate.service.services.StartResponse
-	3,  // 14: dev.restate.service.services.RemoteContext.Send:output_type -> dev.restate.service.services.SendResponse
-	5,  // 15: dev.restate.service.services.RemoteContext.Recv:output_type -> dev.restate.service.services.RecvResponse
-	7,  // 16: dev.restate.service.services.RemoteContext.GetResult:output_type -> dev.restate.service.services.GetResultResponse
-	10, // 17: dev.restate.service.services.RemoteContext.Cleanup:output_type -> google.protobuf.Empty
-	13, // [13:18] is the sub-list for method output_type
-	8,  // [8:13] is the sub-list for method input_type
-	8,  // [8:8] is the sub-list for extension type_name
-	8,  // [8:8] is the sub-list for extension extendee
-	0,  // [0:8] is the sub-list for field type_name
-}
-
-func init() { file_proto_services_services_proto_init() }
-func file_proto_services_services_proto_init() {
-	if File_proto_services_services_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_proto_services_services_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StartRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StartResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SendRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SendResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RecvRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RecvResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetResultRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetResultResponse); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CleanupRequest); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_proto_services_services_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetResultResponse_InvocationFailure); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	file_proto_services_services_proto_msgTypes[1].OneofWrappers = []interface{}{
-		(*StartResponse_Executing)(nil),
-		(*StartResponse_Completed)(nil),
-	}
-	file_proto_services_services_proto_msgTypes[3].OneofWrappers = []interface{}{
-		(*SendResponse_Ok)(nil),
-		(*SendResponse_InvalidStream)(nil),
-		(*SendResponse_InvocationCompleted)(nil),
-	}
-	file_proto_services_services_proto_msgTypes[5].OneofWrappers = []interface{}{
-		(*RecvResponse_Messages)(nil),
-		(*RecvResponse_InvalidStream)(nil),
-		(*RecvResponse_InvocationCompleted)(nil),
-	}
-	file_proto_services_services_proto_msgTypes[7].OneofWrappers = []interface{}{
-		(*GetResultResponse_None)(nil),
-		(*GetResultResponse_Success)(nil),
-		(*GetResultResponse_Failure)(nil),
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_proto_services_services_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   10,
-			NumExtensions: 0,
-			NumServices:   1,
-		},
-		GoTypes:           file_proto_services_services_proto_goTypes,
-		DependencyIndexes: file_proto_services_services_proto_depIdxs,
-		MessageInfos:      file_proto_services_services_proto_msgTypes,
-	}.Build()
-	File_proto_services_services_proto = out.File
-	file_proto_services_services_proto_rawDesc = nil
-	file_proto_services_services_proto_goTypes = nil
-	file_proto_services_services_proto_depIdxs = nil
-}
diff --git a/go.mod b/go.mod
index 65164a6..f9f4eb6 100644
--- a/go.mod
+++ b/go.mod
@@ -3,21 +3,20 @@ module github.com/restatedev/sdk-go
 go 1.22.0
 
 require (
+	github.com/google/uuid v1.6.0
+	github.com/posener/h2conn v0.0.0-20231204025407-3997deeca0f0
 	github.com/rs/zerolog v1.32.0
+	github.com/stretchr/testify v1.9.0
+	github.com/vmihailenco/msgpack/v5 v5.4.1
 	golang.org/x/net v0.21.0
 	google.golang.org/protobuf v1.32.0
 )
 
 require (
-	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/posener/h2conn v0.0.0-20231204025407-3997deeca0f0 // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
-	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	golang.org/x/sys v0.17.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
diff --git a/go.sum b/go.sum
index deb27be..11597c7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,9 +1,9 @@
-github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
-github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
@@ -29,14 +29,16 @@ golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
 golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
 google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/handler.go b/handler.go
index a376d44..5dd650f 100644
--- a/handler.go
+++ b/handler.go
@@ -4,9 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"reflect"
-
-	"github.com/restatedev/sdk-go/generated/proto/dynrpc"
-	"google.golang.org/protobuf/types/known/structpb"
 )
 
 // Void is a placeholder used usually for functions that their signature require that
@@ -37,12 +34,7 @@ func NewUnKeyedHandler[I any, O any](fn UnKeyedHandlerFn[I, O]) *UnKeyedHandler
 	}
 }
 
-func (h *UnKeyedHandler) Call(ctx Context, request *dynrpc.RpcRequest) (*dynrpc.RpcResponse, error) {
-	bytes, err := request.Request.MarshalJSON()
-	if err != nil {
-		return nil, TerminalError(fmt.Errorf("request is not valid json: %w", err))
-	}
-
+func (h *UnKeyedHandler) Call(ctx Context, _key string, bytes []byte) ([]byte, error) {
 	input := reflect.New(h.input)
 
 	if err := json.Unmarshal(bytes, input.Interface()); err != nil {
@@ -61,19 +53,12 @@ func (h *UnKeyedHandler) Call(ctx Context, request *dynrpc.RpcRequest) (*dynrpc.
 		return nil, errI.(error)
 	}
 
-	bytes, err = json.Marshal(outI)
+	bytes, err := json.Marshal(outI)
 	if err != nil {
 		return nil, TerminalError(fmt.Errorf("failed to serialize output: %w", err))
 	}
 
-	var response dynrpc.RpcResponse
-	response.Response = &structpb.Value{}
-
-	if err := response.Response.UnmarshalJSON(bytes); err != nil {
-		return nil, TerminalError(err)
-	}
-
-	return &response, nil
+	return bytes, nil
 }
 
 func (h *UnKeyedHandler) sealed() {}
@@ -92,12 +77,7 @@ func NewKeyedHandler[I any, O any](fn KeyedHandlerFn[I, O]) *KeyedHandler {
 	}
 }
 
-func (h *KeyedHandler) Call(ctx Context, request *dynrpc.RpcRequest) (*dynrpc.RpcResponse, error) {
-	bytes, err := request.Request.MarshalJSON()
-	if err != nil {
-		return nil, TerminalError(fmt.Errorf("request is not valid json: %w", err))
-	}
-
+func (h *KeyedHandler) Call(ctx Context, key string, bytes []byte) ([]byte, error) {
 	input := reflect.New(h.input)
 
 	if err := json.Unmarshal(bytes, input.Interface()); err != nil {
@@ -107,7 +87,7 @@ func (h *KeyedHandler) Call(ctx Context, request *dynrpc.RpcRequest) (*dynrpc.Rp
 	// we are sure about the fn signature so it's safe to do this
 	output := h.fn.Call([]reflect.Value{
 		reflect.ValueOf(ctx),
-		reflect.ValueOf(request.Key),
+		reflect.ValueOf(key),
 		input.Elem(),
 	})
 
@@ -117,19 +97,12 @@ func (h *KeyedHandler) Call(ctx Context, request *dynrpc.RpcRequest) (*dynrpc.Rp
 		return nil, errI.(error)
 	}
 
-	bytes, err = json.Marshal(outI)
+	bytes, err := json.Marshal(outI)
 	if err != nil {
 		return nil, TerminalError(fmt.Errorf("failed to serialize output: %w", err))
 	}
 
-	var response dynrpc.RpcResponse
-	response.Response = &structpb.Value{}
-
-	if err := response.Response.UnmarshalJSON(bytes); err != nil {
-		return nil, TerminalError(err)
-	}
-
-	return &response, nil
+	return bytes, nil
 }
 
 func (h *KeyedHandler) sealed() {}
diff --git a/internal/discovery.go b/internal/discovery.go
new file mode 100644
index 0000000..738d789
--- /dev/null
+++ b/internal/discovery.go
@@ -0,0 +1,57 @@
+package internal
+
+type ProtocolMode string
+
+const (
+	ProtocolMode_BIDI_STREAM      ProtocolMode = "BIDI_STREAM"
+	ProtocolMode_REQUEST_RESPONSE ProtocolMode = "REQUEST_RESPONSE"
+)
+
+type ServiceType string
+
+const (
+	ServiceType_VIRTUAL_OBJECT ServiceType = "VIRTUAL_OBJECT"
+	ServiceType_SERVICE        ServiceType = "SERVICE"
+	ServiceType_WORKFLOW       ServiceType = "WORKFLOW"
+)
+
+type ServiceHandlerType string
+
+const (
+	ServiceHandlerType_WORKFLOW  ServiceHandlerType = "WORKFLOW"
+	ServiceHandlerType_EXCLUSIVE ServiceHandlerType = "EXCLUSIVE"
+	ServiceHandlerType_SHARED    ServiceHandlerType = "SHARED"
+)
+
+type InputPayload struct {
+	Required    bool        `json:"required"`
+	ContentType string      `json:"contentType"`
+	JsonSchema  interface{} `json:"jsonSchema,omitempty"`
+}
+
+type OutputPayload struct {
+	ContentType           string      `json:"contentType"`
+	SetContentTypeIfEmpty bool        `json:"setContentTypeIfEmpty"`
+	JsonSchema            interface{} `json:"jsonSchema,omitempty"`
+}
+
+type Handler struct {
+	Name string `json:"name,omitempty"`
+	// If unspecified, defaults to EXCLUSIVE for Virtual Object. This should be unset for Services.
+	Ty     *ServiceHandlerType `json:"ty,omitempty"`
+	Input  *InputPayload       `json:"input,omitempty"`
+	Output *OutputPayload      `json:"output,omitempty"`
+}
+
+type Service struct {
+	Name     string      `json:"name"`
+	Ty       ServiceType `json:"ty"`
+	Handlers []Handler   `json:"handlers"`
+}
+
+type Endpoint struct {
+	ProtocolMode       ProtocolMode `json:"protocolMode"`
+	MinProtocolVersion int32        `json:"minProtocolVersion"`
+	MaxProtocolVersion int32        `json:"maxProtocolVersion"`
+	Services           []Service    `json:"services"`
+}
diff --git a/internal/dynrpc.binbp b/internal/dynrpc.binbp
deleted file mode 100644
index 005949b..0000000
Binary files a/internal/dynrpc.binbp and /dev/null differ
diff --git a/internal/dynrpc.go b/internal/dynrpc.go
deleted file mode 100644
index 8836efe..0000000
--- a/internal/dynrpc.go
+++ /dev/null
@@ -1,109 +0,0 @@
-package internal
-
-import (
-	_ "embed"
-	"fmt"
-
-	"google.golang.org/protobuf/proto"
-	"google.golang.org/protobuf/types/descriptorpb"
-)
-
-var (
-	requestTypeName  = "RpcRequest"
-	responseTypeName = "RpcResponse"
-)
-
-//go:embed dynrpc.binbp
-var dynRpcBytes []byte
-
-// NewDynRpcDescriptorSet creates a new DynRpcDescriptorSet
-func NewDynRpcDescriptorSet() *DynRpcDescriptorSet {
-	var ds descriptorpb.FileDescriptorSet
-	err := proto.Unmarshal(dynRpcBytes, &ds)
-	if err != nil {
-		panic(fmt.Sprintf("invalid file descriptor set: %s", err))
-	}
-
-	return &DynRpcDescriptorSet{&ds}
-}
-
-// DynRpcService wrapper around ServiceDescriptorProto for easier manipulation
-type DynRpcService struct {
-	*descriptorpb.ServiceDescriptorProto
-}
-
-func (s *DynRpcService) AddHandler(name string) {
-	s.Method = append(s.Method, &descriptorpb.MethodDescriptorProto{
-		Name:       &name,
-		InputType:  &requestTypeName,
-		OutputType: &responseTypeName,
-		// TODO: check options and others
-	})
-}
-
-// DynRpcDescriptorSet wrapper around FileDescriptorSet for easier manipulation
-type DynRpcDescriptorSet struct {
-	*descriptorpb.FileDescriptorSet
-}
-
-// Inner returns the inner *descriptorpb.FileDescriptorSet
-func (d *DynRpcDescriptorSet) Inner() *descriptorpb.FileDescriptorSet {
-	return d.FileDescriptorSet
-}
-
-func (d *DynRpcDescriptorSet) getDynRpcFile() (*descriptorpb.FileDescriptorProto, error) {
-	// since it's always the last file may be we should use the index
-	// but this is safer
-	for _, file := range d.File {
-		if file.Name != nil && *file.Name == "dynrpc/dynrpc.proto" {
-			return file, nil
-		}
-	}
-
-	return nil, fmt.Errorf("file descriptor for dynrpc not found")
-}
-
-// AddKeyedService creates a new Keyed service from the KeyedRpcService template
-func (d *DynRpcDescriptorSet) AddKeyedService(name string) (*DynRpcService, error) {
-	return d.addService(name, 0)
-}
-
-// AddUnKeyedService creates a new Un-Keyed service from the RpcService template
-func (d *DynRpcDescriptorSet) AddUnKeyedService(name string) (*DynRpcService, error) {
-	return d.addService(name, 1)
-}
-
-func (d *DynRpcDescriptorSet) addService(name string, from int) (*DynRpcService, error) {
-	file, err := d.getDynRpcFile()
-	if err != nil {
-		return nil, err
-	}
-
-	// unkeyed service is always number one
-	service, err := deepCopy(file.Service[from])
-	if err != nil {
-		return nil, err
-	}
-
-	service.Name = &name
-	// clean up services
-	service.Method = []*descriptorpb.MethodDescriptorProto{}
-
-	file.Service = append(file.Service, service)
-
-	return &DynRpcService{service}, nil
-}
-
-func deepCopy(src *descriptorpb.ServiceDescriptorProto) (*descriptorpb.ServiceDescriptorProto, error) {
-	bytes, err := proto.Marshal(src)
-	if err != nil {
-		return nil, err
-	}
-
-	var copy descriptorpb.ServiceDescriptorProto
-	if err := proto.Unmarshal(bytes, &copy); err != nil {
-		return nil, err
-	}
-
-	return &copy, nil
-}
diff --git a/internal/dynrpc_test.go b/internal/dynrpc_test.go
deleted file mode 100644
index e28a411..0000000
--- a/internal/dynrpc_test.go
+++ /dev/null
@@ -1,23 +0,0 @@
-package internal
-
-import (
-	"fmt"
-	"testing"
-)
-
-func TestDynRpc(t *testing.T) {
-
-	ds := NewDynRpcDescriptorSet()
-
-	//fmt.Println(len(ds.File))
-	//	require.Len(t, ds.File, 2)
-
-	for _, file := range ds.File {
-
-		fmt.Println(*file.Name)
-		fmt.Printf("dep: %+v\n", file.Dependency)
-		for _, service := range file.Service {
-			fmt.Println("  - service: ", *service.Name)
-		}
-	}
-}
diff --git a/internal/state/call.go b/internal/state/call.go
index 7052620..03bc670 100644
--- a/internal/state/call.go
+++ b/internal/state/call.go
@@ -6,16 +6,14 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/restatedev/sdk-go"
-	"github.com/restatedev/sdk-go/generated/proto/dynrpc"
+	restate "github.com/restatedev/sdk-go"
 	"github.com/restatedev/sdk-go/generated/proto/protocol"
 	"github.com/restatedev/sdk-go/internal/wire"
-	"google.golang.org/protobuf/proto"
-	"google.golang.org/protobuf/types/known/structpb"
 )
 
 var (
 	_ restate.Service = (*serviceProxy)(nil)
+	_ restate.Object  = (*serviceProxy)(nil)
 	_ restate.Call    = (*serviceCall)(nil)
 )
 
@@ -24,12 +22,14 @@ var (
 type serviceProxy struct {
 	*Context
 	service string
+	key     string
 }
 
 func (c *serviceProxy) Method(fn string) restate.Call {
 	return &serviceCall{
 		Context: c.Context,
 		service: c.service,
+		key:     c.key,
 		method:  fn,
 	}
 }
@@ -37,66 +37,34 @@ func (c *serviceProxy) Method(fn string) restate.Call {
 type serviceCall struct {
 	*Context
 	service string
+	key     string
 	method  string
 }
 
 // Do makes a call and wait for the response
-func (c *serviceCall) Do(key string, input any, output any) error {
-	return c.machine.doDynCall(c.service, c.method, key, input, output)
+func (c *serviceCall) Do(input any, output any) error {
+	return c.machine.doDynCall(c.service, c.key, c.method, input, output)
 }
 
 // Send runs a call in the background after delay duration
-func (c *serviceCall) Send(key string, body any, delay time.Duration) error {
-	return c.machine.sendCall(c.service, c.method, key, body, delay)
+func (c *serviceCall) Send(body any, delay time.Duration) error {
+	return c.machine.sendCall(c.service, c.method, c.key, body, delay)
 }
 
-func (m *Machine) makeRequest(key string, body any) ([]byte, error) {
-
-	input, err := json.Marshal(body)
-	if err != nil {
-		return nil, err
-	}
-
-	params := &dynrpc.RpcRequest{
-		Key:     key,
-		Request: &structpb.Value{},
-	}
-
-	if err := params.Request.UnmarshalJSON(input); err != nil {
-		return nil, err
-	}
-
-	return proto.Marshal(params)
-}
-
-func (m *Machine) doDynCall(service, method, key string, input, output any) error {
+func (m *Machine) doDynCall(service, key, method string, input, output any) error {
 	m.log.Debug().Str("service", service).Str("method", method).Msg("in do call")
 
-	params, err := m.makeRequest(key, input)
+	params, err := json.Marshal(input)
 	if err != nil {
 		return err
 	}
 
-	bytes, err := m.doCall(service, method, params)
+	bytes, err := m.doCall(service, key, method, params)
 	if err != nil {
 		return err
 	}
 
-	var rpcResponse dynrpc.RpcResponse
-	if err := proto.Unmarshal(bytes, &rpcResponse); err != nil {
-		return fmt.Errorf("failed to decode rpc response: %w", err)
-	}
-
-	js, err := rpcResponse.Response.MarshalJSON()
-	if err != nil {
-		return fmt.Errorf("failed to process response payload")
-	}
-
-	if output == nil {
-		return nil
-	}
-
-	if err := json.Unmarshal(js, output); err != nil {
+	if err := json.Unmarshal(bytes, output); err != nil {
 		// TODO: is this should be a terminal error or not?
 		return restate.TerminalError(fmt.Errorf("failed to decode response (%s): %w", string(bytes), err))
 	}
@@ -104,35 +72,37 @@ func (m *Machine) doDynCall(service, method, key string, input, output any) erro
 	return nil
 }
 
-func (m *Machine) doCall(service, method string, params []byte) ([]byte, error) {
+func (m *Machine) doCall(service, key, method string, params []byte) ([]byte, error) {
 	return replayOrNew(
 		m,
-		wire.InvokeEntryMessageType,
-		func(entry *wire.InvokeEntryMessage) ([]byte, error) {
+		wire.CallEntryMessageType,
+		func(entry *wire.CallEntryMessage) ([]byte, error) {
 			if entry.Payload.ServiceName != service ||
-				entry.Payload.MethodName != method ||
+				entry.Payload.Key != key ||
+				entry.Payload.HandlerName != method ||
 				!bytes.Equal(entry.Payload.Parameter, params) {
 				return nil, errEntryMismatch
 			}
 
 			switch result := entry.Payload.Result.(type) {
-			case *protocol.InvokeEntryMessage_Failure:
+			case *protocol.CallEntryMessage_Failure:
 				return nil, restate.WithErrorCode(fmt.Errorf(result.Failure.Message), restate.Code(result.Failure.Code))
-			case *protocol.InvokeEntryMessage_Value:
+			case *protocol.CallEntryMessage_Value:
 				return result.Value, nil
 			}
 
 			return nil, errUnreachable
 		}, func() ([]byte, error) {
-			return m._doCall(service, method, params)
+			return m._doCall(service, key, method, params)
 		})
 }
 
-func (m *Machine) _doCall(service, method string, params []byte) ([]byte, error) {
-	err := m.protocol.Write(&protocol.InvokeEntryMessage{
+func (m *Machine) _doCall(service, key, method string, params []byte) ([]byte, error) {
+	err := m.protocol.Write(&protocol.CallEntryMessage{
 		ServiceName: service,
-		MethodName:  method,
+		HandlerName: method,
 		Parameter:   params,
+		Key:         key,
 	})
 
 	if err != nil {
@@ -163,17 +133,18 @@ func (m *Machine) _doCall(service, method string, params []byte) ([]byte, error)
 }
 
 func (c *Machine) sendCall(service, method, key string, body any, delay time.Duration) error {
-	params, err := c.makeRequest(key, body)
+	params, err := json.Marshal(body)
 	if err != nil {
 		return err
 	}
 
 	_, err = replayOrNew(
 		c,
-		wire.BackgroundInvokeEntryMessageType,
-		func(entry *wire.BackgroundInvokeEntryMessage) (restate.Void, error) {
+		wire.OneWayCallEntryMessageType,
+		func(entry *wire.OneWayCallEntryMessage) (restate.Void, error) {
 			if entry.Payload.ServiceName != service ||
-				entry.Payload.MethodName != method ||
+				entry.Payload.Key != key ||
+				entry.Payload.HandlerName != method ||
 				!bytes.Equal(entry.Payload.Parameter, params) {
 				return restate.Void{}, errEntryMismatch
 			}
@@ -194,9 +165,9 @@ func (c *Machine) _sendCall(service, method string, params []byte, delay time.Du
 		invokeTime = uint64(time.Now().Add(delay).UnixMilli())
 	}
 
-	err := c.protocol.Write(&protocol.BackgroundInvokeEntryMessage{
+	err := c.protocol.Write(&protocol.OneWayCallEntryMessage{
 		ServiceName: service,
-		MethodName:  method,
+		HandlerName: method,
 		Parameter:   params,
 		InvokeTime:  invokeTime,
 	})
diff --git a/internal/state/state.go b/internal/state/state.go
index c25dfbe..46d8b07 100644
--- a/internal/state/state.go
+++ b/internal/state/state.go
@@ -8,9 +8,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/cenkalti/backoff/v4"
-	"github.com/restatedev/sdk-go"
-	"github.com/restatedev/sdk-go/generated/proto/dynrpc"
+	restate "github.com/restatedev/sdk-go"
 	"github.com/restatedev/sdk-go/generated/proto/protocol"
 	"github.com/restatedev/sdk-go/internal/wire"
 
@@ -80,17 +78,16 @@ func (c *Context) Service(service string) restate.Service {
 	}
 }
 
-func (c *Context) SideEffect(fn func() ([]byte, error), bo ...backoff.BackOff) ([]byte, error) {
-	var back backoff.BackOff
-	if len(bo) == 0 {
-		back = &restate.DefaultBackoffPolicy
-	} else if len(bo) == 1 {
-		back = bo[0]
-	} else {
-		panic("only single backoff policy is allowed")
+func (c *Context) Object(service, key string) restate.Object {
+	return &serviceProxy{
+		Context: c,
+		service: service,
+		key:     key,
 	}
+}
 
-	return c.machine.sideEffect(fn, back)
+func (c *Context) SideEffect(fn func() ([]byte, error)) ([]byte, error) {
+	return c.machine.sideEffect(fn)
 }
 
 func newContext(inner context.Context, machine *Machine) *Context {
@@ -149,9 +146,6 @@ func (m *Machine) Start(inner context.Context, trace string) error {
 	start := msg.(*wire.StartMessage)
 
 	m.id = start.Payload.DebugId
-	if start.Version != Version {
-		return ErrInvalidVersion
-	}
 
 	m.log = log.With().Str("id", start.Payload.DebugId).Str("method", trace).Logger()
 
@@ -164,15 +158,15 @@ func (m *Machine) Start(inner context.Context, trace string) error {
 }
 
 // handle handler response and build proper response message
-func (m *Machine) output(r *dynrpc.RpcResponse, err error) proto.Message {
+func (m *Machine) output(bytes []byte, err error) proto.Message {
 	if err != nil {
 		m.log.Error().Err(err).Msg("failure")
 	}
 
 	if err != nil && restate.IsTerminalError(err) {
 		// terminal errors.
-		return &protocol.OutputStreamEntryMessage{
-			Result: &protocol.OutputStreamEntryMessage_Failure{
+		return &protocol.OutputEntryMessage{
+			Result: &protocol.OutputEntryMessage_Failure{
 				Failure: &protocol.Failure{
 					Code:    uint32(restate.ErrorCode(err)),
 					Message: err.Error(),
@@ -187,24 +181,14 @@ func (m *Machine) output(r *dynrpc.RpcResponse, err error) proto.Message {
 		}
 	}
 
-	bytes, err := proto.Marshal(r)
-	if err != nil {
-		// this shouldn't happen but in case we return a retry error
-		return &protocol.ErrorMessage{
-			Code:        uint32(restate.INTERNAL),
-			Message:     err.Error(),
-			Description: "failed to serialize call output",
-		}
-	}
-
-	return &protocol.OutputStreamEntryMessage{
-		Result: &protocol.OutputStreamEntryMessage_Value{
+	return &protocol.OutputEntryMessage{
+		Result: &protocol.OutputEntryMessage_Value{
 			Value: bytes,
 		},
 	}
 }
 
-func (m *Machine) invoke(ctx *Context, input *dynrpc.RpcRequest) error {
+func (m *Machine) invoke(ctx *Context, key string, input []byte) error {
 	// always terminate the invocation with
 	// an end message.
 	// this will always terminate the connection
@@ -250,7 +234,7 @@ func (m *Machine) invoke(ctx *Context, input *dynrpc.RpcRequest) error {
 		}
 	}()
 
-	output := m.output(m.handler.Call(ctx, input))
+	output := m.output(m.handler.Call(ctx, key, input))
 
 	return m.protocol.Write(output)
 }
@@ -266,7 +250,7 @@ func (m *Machine) process(ctx *Context, start *wire.StartMessage) error {
 		return err
 	}
 
-	if msg.Type() != wire.PollInputEntryMessageType {
+	if msg.Type() != wire.InputEntryMessageType {
 		return wire.ErrUnexpectedMessage
 	}
 
@@ -284,14 +268,9 @@ func (m *Machine) process(ctx *Context, start *wire.StartMessage) error {
 		m.entries = append(m.entries, msg)
 	}
 
-	inputMsg := msg.(*wire.PollInputEntry)
+	inputMsg := msg.(*wire.InputEntryMessage)
 	value := inputMsg.Payload.GetValue()
-	var input dynrpc.RpcRequest
-	if err := proto.Unmarshal(value, &input); err != nil {
-		return fmt.Errorf("invalid invocation input: %w", err)
-	}
-
-	return m.invoke(ctx, &input)
+	return m.invoke(ctx, start.Payload.Key, value)
 
 }
 
diff --git a/internal/state/sys.go b/internal/state/sys.go
index 571d0aa..da03ac3 100644
--- a/internal/state/sys.go
+++ b/internal/state/sys.go
@@ -2,12 +2,11 @@ package state
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"time"
 
-	"github.com/cenkalti/backoff/v4"
-	"github.com/restatedev/sdk-go"
-	"github.com/restatedev/sdk-go/generated/proto/javascript"
+	restate "github.com/restatedev/sdk-go"
 	"github.com/restatedev/sdk-go/generated/proto/protocol"
 	"github.com/restatedev/sdk-go/internal/wire"
 	"google.golang.org/protobuf/proto"
@@ -321,59 +320,62 @@ func (m *Machine) _sleep(until time.Time) error {
 	return nil
 }
 
-func (m *Machine) sideEffect(fn func() ([]byte, error), bo backoff.BackOff) ([]byte, error) {
+func (m *Machine) sideEffect(fn func() ([]byte, error)) ([]byte, error) {
 	return replayOrNew(
 		m,
-		wire.SideEffectEntryMessageType,
-		func(entry *wire.SideEffectEntryMessage) ([]byte, error) {
+		wire.RunEntryMessageType,
+		func(entry *wire.RunEntryMessage) ([]byte, error) {
 			switch result := entry.Payload.Result.(type) {
-			case *javascript.SideEffectEntryMessage_Failure:
-				err := fmt.Errorf("[%d] %s", result.Failure.Failure.Code, result.Failure.Failure.Message)
-				if result.Failure.Terminal {
-					err = restate.TerminalError(err)
-				}
-				return nil, err
-			case *javascript.SideEffectEntryMessage_Value:
+			case *protocol.RunEntryMessage_Failure:
+				return nil, restate.TerminalError(errors.New(result.Failure.Message), restate.Code(result.Failure.Code))
+			case *protocol.RunEntryMessage_Value:
 				return result.Value, nil
 			}
 
 			return nil, errUnreachable
 		},
 		func() ([]byte, error) {
-			return m._sideEffect(fn, bo)
+			return m._sideEffect(fn)
 		},
 	)
 }
 
-func (m *Machine) _sideEffect(fn func() ([]byte, error), bo backoff.BackOff) ([]byte, error) {
-	var bytes []byte
-	err := backoff.Retry(func() error {
-		var err error
-		bytes, err = fn()
+func (m *Machine) _sideEffect(fn func() ([]byte, error)) ([]byte, error) {
+	bytes, err := fn()
 
-		if restate.IsTerminalError(err) {
-			// if inner function returned a terminal error
-			// we need to wrap it in permanent to break
-			// the retries
-			return backoff.Permanent(err)
-		}
-		return err
-	}, bo)
-
-	var msg javascript.SideEffectEntryMessage
+	var msg protocol.RunEntryMessage
 	if err != nil {
-		msg.Result = &javascript.SideEffectEntryMessage_Failure{
-			Failure: &javascript.FailureWithTerminal{
-				Failure: &protocol.Failure{
-					Code:    uint32(restate.ErrorCode(err)),
-					Message: err.Error(),
+		if restate.IsTerminalError(err) {
+			msg := protocol.RunEntryMessage{
+				Result: &protocol.RunEntryMessage_Failure{
+					Failure: &protocol.Failure{
+						Code:    uint32(restate.ErrorCode(err)),
+						Message: err.Error(),
+					},
 				},
-				Terminal: restate.IsTerminalError(err),
-			},
+			}
+			if err := m.protocol.Write(&msg); err != nil {
+				return nil, err
+			}
+		} else {
+			ty := uint32(wire.RunEntryMessageType)
+			msg := protocol.ErrorMessage{
+				Code:             uint32(restate.ErrorCode(err)),
+				Message:          err.Error(),
+				RelatedEntryType: &ty,
+			}
+			if err := m.protocol.Write(&msg); err != nil {
+				return nil, err
+			}
 		}
 	} else {
-		msg.Result = &javascript.SideEffectEntryMessage_Value{
-			Value: bytes,
+		msg := protocol.RunEntryMessage{
+			Result: &protocol.RunEntryMessage_Value{
+				Value: bytes,
+			},
+		}
+		if err := m.protocol.Write(&msg); err != nil {
+			return nil, err
 		}
 	}
 
diff --git a/internal/wire/wire.go b/internal/wire/wire.go
index 2c29134..a750d0f 100644
--- a/internal/wire/wire.go
+++ b/internal/wire/wire.go
@@ -9,8 +9,7 @@ import (
 	"io"
 	"math"
 
-	"github.com/restatedev/sdk-go/generated/proto/javascript"
-	"github.com/restatedev/sdk-go/generated/proto/protocol"
+	protocol "github.com/restatedev/sdk-go/generated/proto/protocol"
 	"github.com/rs/zerolog/log"
 	"google.golang.org/protobuf/proto"
 )
@@ -36,8 +35,8 @@ const (
 	EndMessageType        Type = 0x0000 + 5
 
 	// Input/Output
-	PollInputEntryMessageType    Type = 0x0400
-	OutputStreamEntryMessageType Type = 0x0400 + 1
+	InputEntryMessageType  Type = 0x0400
+	OutputEntryMessageType Type = 0x0400 + 1
 
 	// State
 	GetStateEntryMessageType      Type = 0x0800
@@ -47,12 +46,12 @@ const (
 	GetStateKeysEntryMessageType  Type = 0x0800 + 4
 
 	//SysCalls
-	SleepEntryMessageType            Type = 0x0C00
-	InvokeEntryMessageType           Type = 0x0C00 + 1
-	BackgroundInvokeEntryMessageType Type = 0x0C00 + 2
-
-	// SideEffect
-	SideEffectEntryMessageType Type = 0xFC00 + 1
+	SleepEntryMessageType             Type = 0x0C00
+	CallEntryMessageType              Type = 0x0C00 + 1
+	OneWayCallEntryMessageType        Type = 0x0C00 + 2
+	AwakeableEntryMessageType         Type = 0x0C00 + 3
+	CompleteAwakeableEntryMessageType Type = 0x0C00 + 4
+	RunEntryMessageType               Type = 0x0C00 + 5
 )
 
 type Type uint16
@@ -65,11 +64,6 @@ func (t Type) String() string {
 // a different meaning based on message type.
 type Flag uint16
 
-// this is only valid with start message
-func (r Flag) version() uint16 {
-	return uint16(r) & VersionMask
-}
-
 func (r Flag) Completed() bool {
 	return r&FlagCompleted != 0
 }
@@ -193,10 +187,10 @@ func (s *Protocol) Write(message proto.Message, flags ...Flag) error {
 		typ = StartMessageType
 	case *protocol.SuspensionMessage:
 		typ = SuspensionMessageType
-	case *protocol.PollInputStreamEntryMessage:
-		typ = PollInputEntryMessageType
-	case *protocol.OutputStreamEntryMessage:
-		typ = OutputStreamEntryMessageType
+	case *protocol.InputEntryMessage:
+		typ = InputEntryMessageType
+	case *protocol.OutputEntryMessage:
+		typ = OutputEntryMessageType
 	case *protocol.ErrorMessage:
 		typ = ErrorMessageType
 	case *protocol.EndMessage:
@@ -211,14 +205,14 @@ func (s *Protocol) Write(message proto.Message, flags ...Flag) error {
 		typ = ClearAllStateEntryMessageType
 	case *protocol.SleepEntryMessage:
 		typ = SleepEntryMessageType
-	case *protocol.InvokeEntryMessage:
-		typ = InvokeEntryMessageType
-	case *protocol.BackgroundInvokeEntryMessage:
-		typ = BackgroundInvokeEntryMessageType
+	case *protocol.CallEntryMessage:
+		typ = CallEntryMessageType
+	case *protocol.OneWayCallEntryMessage:
+		typ = OneWayCallEntryMessageType
 	case *protocol.GetStateKeysEntryMessage:
 		typ = GetStateKeysEntryMessageType
-	case *javascript.SideEffectEntryMessage:
-		typ = SideEffectEntryMessageType
+	case *protocol.RunEntryMessage:
+		typ = RunEntryMessageType
 	default:
 		return fmt.Errorf("can not send message of unknown message type")
 	}
@@ -258,8 +252,7 @@ var (
 	builders = map[Type]messageBuilder{
 		StartMessageType: func(header Header, bytes []byte) (Message, error) {
 			msg := &StartMessage{
-				Header:  header,
-				Version: header.Flag.version(),
+				Header: header,
 			}
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
@@ -271,15 +264,15 @@ var (
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
 		},
-		PollInputEntryMessageType: func(header Header, bytes []byte) (Message, error) {
-			msg := &PollInputEntry{
+		InputEntryMessageType: func(header Header, bytes []byte) (Message, error) {
+			msg := &InputEntryMessage{
 				Header: header,
 			}
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
 		},
-		OutputStreamEntryMessageType: func(header Header, bytes []byte) (Message, error) {
-			msg := &OutputStreamEntry{
+		OutputEntryMessageType: func(header Header, bytes []byte) (Message, error) {
+			msg := &OutputEntryMessage{
 				Header: header,
 			}
 
@@ -334,22 +327,22 @@ var (
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
 		},
-		InvokeEntryMessageType: func(header Header, bytes []byte) (Message, error) {
-			msg := &InvokeEntryMessage{
+		CallEntryMessageType: func(header Header, bytes []byte) (Message, error) {
+			msg := &CallEntryMessage{
 				Header: header,
 			}
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
 		},
-		BackgroundInvokeEntryMessageType: func(header Header, bytes []byte) (Message, error) {
-			msg := &BackgroundInvokeEntryMessage{
+		OneWayCallEntryMessageType: func(header Header, bytes []byte) (Message, error) {
+			msg := &OneWayCallEntryMessage{
 				Header: header,
 			}
 
 			return msg, proto.Unmarshal(bytes, &msg.Payload)
 		},
-		SideEffectEntryMessageType: func(header Header, bytes []byte) (Message, error) {
-			msg := &SideEffectEntryMessage{
+		RunEntryMessageType: func(header Header, bytes []byte) (Message, error) {
+			msg := &RunEntryMessage{
 				Header: header,
 			}
 
@@ -360,18 +353,17 @@ var (
 
 type StartMessage struct {
 	Header
-	Version uint16
 	Payload protocol.StartMessage
 }
 
-type PollInputEntry struct {
+type InputEntryMessage struct {
 	Header
-	Payload protocol.PollInputStreamEntryMessage
+	Payload protocol.InputEntryMessage
 }
 
-type OutputStreamEntry struct {
+type OutputEntryMessage struct {
 	Header
-	Payload protocol.OutputStreamEntryMessage
+	Payload protocol.OutputEntryMessage
 }
 
 type GetStateEntryMessage struct {
@@ -409,19 +401,19 @@ type SleepEntryMessage struct {
 	Payload protocol.SleepEntryMessage
 }
 
-type InvokeEntryMessage struct {
+type CallEntryMessage struct {
 	Header
-	Payload protocol.InvokeEntryMessage
+	Payload protocol.CallEntryMessage
 }
 
-type BackgroundInvokeEntryMessage struct {
+type OneWayCallEntryMessage struct {
 	Header
-	Payload protocol.BackgroundInvokeEntryMessage
+	Payload protocol.OneWayCallEntryMessage
 }
 
-type SideEffectEntryMessage struct {
+type RunEntryMessage struct {
 	Header
-	Payload javascript.SideEffectEntryMessage
+	Payload protocol.RunEntryMessage
 }
 
 type EntryAckMessage struct {
diff --git a/proto/buf.lock b/proto/buf.lock
deleted file mode 100644
index 84e0028..0000000
--- a/proto/buf.lock
+++ /dev/null
@@ -1,8 +0,0 @@
-# Generated by buf. DO NOT EDIT.
-version: v1
-deps:
-  - remote: buf.build
-    owner: restatedev
-    repository: proto
-    commit: 6ea2d15aed8f408590a1465844df5a8e
-    digest: shake256:e6599809ff13490a631f87d1a4b13ef1886d1bd1c0aa001ccb92806c0acc373d047a6ead761f8a21dfbd57a4fd9acd5915a52e47bd5b4e4a02dd1766f78511b3
diff --git a/proto/discovery/discovery.proto b/proto/discovery/discovery.proto
index 36d8d92..e385c92 100644
--- a/proto/discovery/discovery.proto
+++ b/proto/discovery/discovery.proto
@@ -1,46 +1,22 @@
-/*
- * Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
- *
- * This file is part of the Restate SDK for Node.js/TypeScript,
- * which is released under the MIT license.
- *
- * You can find a copy of the license in file LICENSE in the root
- * directory of this repository or package, or at
- * https://github.com/restatedev/sdk-typescript/blob/main/LICENSE
- */
+// Copyright (c) 2024 - Restate Software, Inc., Restate GmbH
+//
+// This file is part of the Restate service protocol, which is
+// released under the MIT license.
+//
+// You can find a copy of the license in file LICENSE in the root
+// directory of this repository or package, or at
+// https://github.com/restatedev/service-protocol/blob/main/LICENSE
 
 syntax = "proto3";
 
 package dev.restate.service.discovery;
 
-import "google/protobuf/descriptor.proto";
+option java_package = "dev.restate.generated.service.discovery";
+option go_package = "restate.dev/sdk-go/pb/service/discovery";
 
-// --- Service discovery endpoint ---
-// Request: POST /discover with application/proto containing
-// ServiceDiscoveryRequest Response: application/proto containing
-// ServiceDiscoveryResponse
-
-message ServiceDiscoveryRequest {}
-
-enum ProtocolMode {
-  // protolint:disable:next ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
-  BIDI_STREAM = 0;
-  REQUEST_RESPONSE = 1;
-}
-
-message ServiceDiscoveryResponse {
-  // List of all proto files used to define the services, including the
-  // dependencies.
-  google.protobuf.FileDescriptorSet files = 1;
-
-  // List of services to register. This might be a subset of services defined in
-  // files.
-  repeated string services = 2;
-
-  // Service-protocol version negotiation
-  uint32 min_protocol_version = 3;
-  uint32 max_protocol_version = 4;
-
-  // Protocol mode negotiation
-  ProtocolMode protocol_mode = 5;
+// Service discovery protocol version.
+enum ServiceDiscoveryProtocolVersion {
+  SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED = 0;
+  // initial service discovery protocol version using endpoint_manifest_schema.json
+  V1 = 1;
 }
diff --git a/proto/dynrpc/dynrpc.proto b/proto/dynrpc/dynrpc.proto
deleted file mode 100644
index 8f459ae..0000000
--- a/proto/dynrpc/dynrpc.proto
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
- *
- * This file is part of the Restate SDK for Node.js/TypeScript,
- * which is released under the MIT license.
- *
- * You can find a copy of the license in file LICENSE in the root
- * directory of this repository or package, or at
- * https://github.com/restatedev/sdk-typescript/blob/main/LICENSE
- */
-
-syntax = "proto3";
-
-import "dev/restate/ext.proto";
-import "google/protobuf/struct.proto";
-import "google/protobuf/empty.proto";
-
-service RpcEndpoint {
-  option (dev.restate.ext.service_type) = KEYED;
-
-  rpc call(RpcRequest) returns (RpcResponse) {};
-
-  rpc handle(KeyedEvent) returns (google.protobuf.Empty) {};
-}
-
-message KeyedEvent {
-  string key = 1 [ (dev.restate.ext.field) = KEY ];
-  bytes payload = 3 [ (dev.restate.ext.field) = EVENT_PAYLOAD ];
-  map<string, string> attributes = 15
-      [ (dev.restate.ext.field) = EVENT_METADATA ];
-}
-
-service UnkeyedRpcEndpoint {
-  option (dev.restate.ext.service_type) = UNKEYED;
-
-  rpc call(RpcRequest) returns (RpcResponse) {};
-}
-
-message RpcRequest {
-  string key = 1 [ (dev.restate.ext.field) = KEY ];
-  google.protobuf.Value request = 2;
-
-  // internal: see src/utils/assumptions.ts
-  int32 sender_assumes = 101;
-}
-
-message RpcResponse { google.protobuf.Value response = 1; }
diff --git a/proto/javascript/javascript.proto b/proto/javascript/javascript.proto
index c78b9d6..f774986 100644
--- a/proto/javascript/javascript.proto
+++ b/proto/javascript/javascript.proto
@@ -15,20 +15,6 @@ package dev.restate.sdk.javascript;
 
 import "proto/protocol/protocol.proto";
 
-message FailureWithTerminal {
-  dev.restate.service.protocol.Failure failure = 1;
-  bool terminal = 2;
-}
-
-// Type: 0xFC00 + 1
-// Flag: RequiresRuntimeAck
-message SideEffectEntryMessage {
-  oneof result {
-    bytes value = 14;
-    FailureWithTerminal failure = 15;
-  };
-}
-
 // Type: 0xFC00 + 2
 message CombinatorEntryMessage {
   int32 combinator_id = 1;
diff --git a/proto/protocol/protocol.proto b/proto/protocol/protocol.proto
index 68c9d95..333a36e 100644
--- a/proto/protocol/protocol.proto
+++ b/proto/protocol/protocol.proto
@@ -11,11 +11,16 @@ syntax = "proto3";
 
 package dev.restate.service.protocol;
 
-import "google/protobuf/empty.proto";
-
 option java_package = "dev.restate.generated.service.protocol";
 option go_package = "restate.dev/sdk-go/pb/service/protocol";
 
+// Service protocol version.
+enum ServiceProtocolVersion {
+  SERVICE_PROTOCOL_VERSION_UNSPECIFIED = 0;
+  // initial service protocol version
+  V1 = 1;
+}
+
 // --- Core frames ---
 
 // Type: 0x0000 + 0
@@ -27,13 +32,11 @@ message StartMessage {
     bytes value = 2;
   }
 
-  // Unique id of the invocation. This id is unique across invocations and won't
-  // change when replaying the journal.
+  // Unique id of the invocation. This id is unique across invocations and won't change when replaying the journal.
   bytes id = 1;
 
   // Invocation id that can be used for logging.
-  // The user can use this id to address this invocation in admin and status
-  // introspection apis.
+  // The user can use this id to address this invocation in admin and status introspection apis.
   string debug_id = 2;
 
   uint32 known_entries = 3;
@@ -41,6 +44,9 @@ message StartMessage {
   // protolint:disable:next REPEATED_FIELD_NAMES_PLURALIZED
   repeated StateEntry state_map = 4;
   bool partial_state = 5;
+
+  // If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+  string key = 6;
 }
 
 // Type: 0x0000 + 1
@@ -48,7 +54,7 @@ message CompletionMessage {
   uint32 entry_index = 1;
 
   oneof result {
-    google.protobuf.Empty empty = 13;
+    Empty empty = 13;
     bytes value = 14;
     Failure failure = 15;
   };
@@ -57,76 +63,84 @@ message CompletionMessage {
 // Type: 0x0000 + 2
 // Implementations MUST send this message when suspending an invocation.
 message SuspensionMessage {
-  // This list represents any of the entry_index the invocation is waiting on to
-  // progress. The runtime will resume the invocation as soon as one of the
-  // given entry_index is completed. This list MUST not be empty. False
-  // positive, entry_indexes is a valid plural of entry_indices.
+  // This list represents any of the entry_index the invocation is waiting on to progress.
+  // The runtime will resume the invocation as soon as one of the given entry_index is completed.
+  // This list MUST not be empty.
+  // False positive, entry_indexes is a valid plural of entry_indices.
   // https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/i/index-indexes-indices
-  repeated uint32 entry_indexes =
-      1; // protolint:disable:this REPEATED_FIELD_NAMES_PLURALIZED
+  repeated uint32 entry_indexes = 1;  // protolint:disable:this REPEATED_FIELD_NAMES_PLURALIZED
 }
 
 // Type: 0x0000 + 3
 message ErrorMessage {
-  // The code can be:
-  // * Any of the error codes defined by OutputStreamEntry.failure (see Failure
-  // message)
-  // * JOURNAL_MISMATCH = 32, that is when the SDK cannot replay a journal due
-  // to the mismatch between the journal and the actual code.
-  // * PROTOCOL_VIOLATION = 33, that is when the SDK receives an unexpected
-  // message or an expected message variant, given its state.
-  //
-  // If 16 < code < 32, or code > 33, the runtime will interpret it as code 2
-  // (UNKNOWN).
+  // The code can be any HTTP status code, as described https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml.
+  // In addition, we define the following error codes that MAY be used by the SDK for better error reporting:
+  // * JOURNAL_MISMATCH = 570, that is when the SDK cannot replay a journal due to the mismatch between the journal and the actual code.
+  // * PROTOCOL_VIOLATION = 571, that is when the SDK receives an unexpected message or an expected message variant, given its state.
   uint32 code = 1;
   // Contains a concise error message, e.g. Throwable#getMessage() in Java.
   string message = 2;
   // Contains a verbose error description, e.g. the exception stacktrace.
   string description = 3;
+
+  // Entry that caused the failure. This may be outside the current stored journal size.
+  // If no specific entry caused the failure, the current replayed/processed entry can be used.
+  optional uint32 related_entry_index = 4;
+  // Name of the entry that caused the failure.
+  optional string related_entry_name = 5;
+  // Entry type.
+  optional uint32 related_entry_type = 6;
 }
 
 // Type: 0x0000 + 4
-message EntryAckMessage { uint32 entry_index = 1; }
+message EntryAckMessage {
+  uint32 entry_index = 1;
+}
 
 // Type: 0x0000 + 5
 // Implementations MUST send this message when the invocation lifecycle ends.
-message EndMessage {}
+message EndMessage {
+}
 
 // --- Journal Entries ---
 
-// Every Completable JournalEntry has a result field, filled only and only if
-// the entry is in DONE state. Depending on the semantics of the corresponding
-// syscall, the entry can represent the result field with any of these three
-// types:
+// Every Completable JournalEntry has a result field, filled only and only if the entry is in DONE state.
+//
+// For every journal entry, fields 12, 13, 14 and 15 are reserved.
+//
+// The field 12 is used for name. The name is used by introspection/observability tools.
+//
+// Depending on the semantics of the corresponding syscall, the entry can represent the completion result field with any of these three types:
 //
-//   * google.protobuf.Empty empty = 13 for cases when we need to propagate to
-//   user code the distinction between default value or no value.
+//   * google.protobuf.Empty empty = 13 for cases when we need to propagate to user code the distinction between default value or no value.
 //   * bytes value = 14 for carrying the result value
 //   * Failure failure = 15 for carrying a failure
-//
-// The tag numbers 13, 14 and 15 are reserved and shouldn't be used for other
-// fields.
 
 // ------ Input and output ------
 
-// Completable: Yes
+// Completable: No
 // Fallible: No
 // Type: 0x0400 + 0
-message PollInputStreamEntryMessage {
-  oneof result {
-    bytes value = 14;
-    Failure failure = 15;
-  }
+message InputEntryMessage {
+  repeated Header headers = 1;
+
+  bytes value = 14;
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: No
 // Fallible: No
 // Type: 0x0400 + 1
-message OutputStreamEntryMessage {
+message OutputEntryMessage {
   oneof result {
     bytes value = 14;
     Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
 }
 
 // ------ State access ------
@@ -138,10 +152,13 @@ message GetStateEntryMessage {
   bytes key = 1;
 
   oneof result {
-    google.protobuf.Empty empty = 13;
+    Empty empty = 13;
     bytes value = 14;
     Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: No
@@ -150,28 +167,98 @@ message GetStateEntryMessage {
 message SetStateEntryMessage {
   bytes key = 1;
   bytes value = 3;
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: No
 // Fallible: No
 // Type: 0x0800 + 2
-message ClearStateEntryMessage { bytes key = 1; }
+message ClearStateEntryMessage {
+  bytes key = 1;
+
+  // Entry name
+  string name = 12;
+}
 
 // Completable: No
 // Fallible: No
 // Type: 0x0800 + 3
-message ClearAllStateEntryMessage {}
+message ClearAllStateEntryMessage {
+  // Entry name
+  string name = 12;
+}
 
 // Completable: Yes
 // Fallible: No
 // Type: 0x0800 + 4
 message GetStateKeysEntryMessage {
-  message StateKeys { repeated bytes keys = 1; }
+  message StateKeys {
+    repeated bytes keys = 1;
+  }
 
   oneof result {
     StateKeys value = 14;
     Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
+}
+
+// Completable: Yes
+// Fallible: No
+// Type: 0x0800 + 8
+message GetPromiseEntryMessage {
+  string key = 1;
+
+  oneof result {
+    bytes value = 14;
+    Failure failure = 15;
+  };
+
+  // Entry name
+  string name = 12;
+}
+
+// Completable: Yes
+// Fallible: No
+// Type: 0x0800 + 9
+message PeekPromiseEntryMessage {
+  string key = 1;
+
+  oneof result {
+    Empty empty = 13;
+    bytes value = 14;
+    Failure failure = 15;
+  };
+
+  // Entry name
+  string name = 12;
+}
+
+// Completable: Yes
+// Fallible: No
+// Type: 0x0800 + A
+message CompletePromiseEntryMessage {
+  string key = 1;
+
+  // The value to use to complete the promise
+  oneof completion {
+    bytes completion_value = 2;
+    Failure completion_failure = 3;
+  };
+
+  oneof result {
+    // Returns empty if value was set successfully
+    Empty empty = 13;
+    // Returns a failure if the promise was already completed
+    Failure failure = 15;
+  }
+
+  // Entry name
+  string name = 12;
 }
 
 // ------ Syscalls ------
@@ -185,32 +272,43 @@ message SleepEntryMessage {
   uint64 wake_up_time = 1;
 
   oneof result {
-    google.protobuf.Empty empty = 13;
+    Empty empty = 13;
     Failure failure = 15;
   }
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: Yes
 // Fallible: Yes
 // Type: 0x0C00 + 1
-message InvokeEntryMessage {
+message CallEntryMessage {
   string service_name = 1;
-  string method_name = 2;
+  string handler_name = 2;
 
   bytes parameter = 3;
 
+  repeated Header headers = 4;
+
+  // If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+  string key = 5;
+
   oneof result {
     bytes value = 14;
     Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: No
 // Fallible: Yes
 // Type: 0x0C00 + 2
-message BackgroundInvokeEntryMessage {
+message OneWayCallEntryMessage {
   string service_name = 1;
-  string method_name = 2;
+  string handler_name = 2;
 
   bytes parameter = 3;
 
@@ -219,18 +317,28 @@ message BackgroundInvokeEntryMessage {
   // If this value is not set, equal to 0, or past in time,
   // the runtime will execute this BackgroundInvoke as soon as possible.
   uint64 invoke_time = 4;
+
+  repeated Header headers = 5;
+
+  // If this invocation has a key associated (e.g. for objects and workflows), then this key is filled in. Empty otherwise.
+  string key = 6;
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: Yes
 // Fallible: No
 // Type: 0x0C00 + 3
-// Awakeables are addressed by an identifier exposed to the user. See the spec
-// for more details.
+// Awakeables are addressed by an identifier exposed to the user. See the spec for more details.
 message AwakeableEntryMessage {
   oneof result {
     bytes value = 14;
     Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
 }
 
 // Completable: No
@@ -241,23 +349,43 @@ message CompleteAwakeableEntryMessage {
   string id = 1;
 
   oneof result {
-    bytes value = 5;
-    Failure failure = 6;
+    bytes value = 14;
+    Failure failure = 15;
+  };
+
+  // Entry name
+  string name = 12;
+}
+
+// Completable: No
+// Fallible: No
+// Type: 0x0C00 + 5
+// Flag: RequiresRuntimeAck
+message RunEntryMessage {
+  oneof result {
+    bytes value = 14;
+    dev.restate.service.protocol.Failure failure = 15;
   };
+
+  // Entry name
+  string name = 12;
 }
 
 // --- Nested messages
 
 // This failure object carries user visible errors,
-// e.g. invocation failure return value or failure result of an
-// InvokeEntryMessage.
+// e.g. invocation failure return value or failure result of an InvokeEntryMessage.
 message Failure {
-  // The code should be any of the gRPC error codes,
-  // as defined here:
-  // https://github.com/grpc/grpc/blob/master/doc/statuscodes.md#status-codes-and-their-use-in-grpc
-  //
-  // If code > 16, the runtime will interpret it as code 2 (UNKNOWN).
+  // The code can be any HTTP status code, as described https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml.
   uint32 code = 1;
   // Contains a concise error message, e.g. Throwable#getMessage() in Java.
   string message = 2;
 }
+
+message Header {
+  string key = 1;
+  string value = 2;
+}
+
+message Empty {
+}
diff --git a/proto/services/services.proto b/proto/services/services.proto
deleted file mode 100644
index 59c939e..0000000
--- a/proto/services/services.proto
+++ /dev/null
@@ -1,186 +0,0 @@
-// Copyright (c) 2023-2024 - Restate Software, Inc., Restate GmbH
-//
-// This file is part of the Restate service protocol, which is
-// released under the MIT license.
-//
-// You can find a copy of the license in file LICENSE in the root
-// directory of this repository or package, or at
-// https://github.com/restatedev/proto/blob/main/LICENSE
-
-syntax = "proto3";
-
-/*
-  This package contains internal service interfaces
- */
-package dev.restate.service.services;
-
-import "dev/restate/ext.proto";
-import "google/protobuf/empty.proto";
-import "google/protobuf/struct.proto";
-
-// RemoteContext service to implement the embedded handler API
-service RemoteContext {
-  option (dev.restate.ext.service_type) = KEYED;
-
-  // Start a new invocation, or resume a previously existing one.
-  //
-  // If another client is already executing this invocation, it will be fenced
-  // off and this client will take precedence.
-  //
-  // This method is not idempotent.
-  rpc Start(StartRequest) returns (StartResponse);
-
-  // Send new messages to append to the message stream.
-  //
-  // This method is not idempotent, and a request can fail for several reasons,
-  // including errors in sent messages, or some other transient error.
-  // The client should consider the stream in an unrecoverable error state and
-  // it can retry by creating a new stream through Start() with a different
-  // stream_id.
-  //
-  // Once the invocation is completed, subsequent Send fail.
-  rpc Send(SendRequest) returns (SendResponse);
-
-  // Receive new messages from the message stream.
-  //
-  // This method is not idempotent, and a request can fail for several reasons,
-  // including errors in sent messages, or some other transient error.
-  // The client should consider the stream in an unrecoverable error state and
-  // it can retry by creating a new stream through Start() with a different
-  // stream_id.
-  //
-  // If the invocation is completed, Recv returns a response with messages field
-  // empty.
-  rpc Recv(RecvRequest) returns (RecvResponse);
-
-  // Get the result of the invocation.
-  //
-  // In case another client is executing the invocation (through a sequence of
-  // Start/Send/Recv), this method will block until a response is computed. In
-  // case the response is already available, it will return immediately with the
-  // response. In case no client is executing the invocation, that is no client
-  // ever invoked Start() for the given operation_id, this method will return
-  // response.none.
-  //
-  // This method can be safely invoked by multiple clients and it's idempotent.
-  rpc GetResult(GetResultRequest) returns (GetResultResponse);
-
-  // Cleanup all the state of the invocation, excluding the user state.
-  //
-  // This is automatically executed when retention_period_sec is past, but it
-  // can be manually invoked before the expiry time elapsed.
-  rpc Cleanup(CleanupRequest) returns (google.protobuf.Empty);
-}
-
-message StartRequest {
-  // User provided operation id, this is used as idempotency key.
-  string operation_id = 1 [ (dev.restate.ext.field) = KEY ];
-
-  // Stream id to uniquely identify a open stream between client and Restate.
-  // There can be at most one open stream at the same time.
-  string stream_id = 2;
-
-  // Retention period for the response in seconds.
-  // After the invocation completes, the response will be persisted for the
-  // given duration. Afterwards, the system will cleanup the response and treats
-  // any subsequent invocation with same operation_id as new.
-  //
-  // If not set, 30 minutes will be used as retention period.
-  uint32 retention_period_sec = 3;
-
-  // Argument of the invocation
-  bytes argument = 4;
-}
-
-message StartResponse {
-  oneof invocation_status {
-    // Contains the concatenated first messages of the stream, encoded using the
-    // same framing used by service-protocol
-    bytes executing = 1;
-
-    // Contains the result of the invocation
-    GetResultResponse completed = 2;
-  }
-}
-
-message SendRequest {
-  // User provided operation id, this is used as idempotency key.
-  string operation_id = 1 [ (dev.restate.ext.field) = KEY ];
-
-  // Stream id to uniquely identify a open stream between client and Restate.
-  // There can be at most one open stream at the same time.
-  string stream_id = 2;
-
-  // Contains the concatenated messages of the stream, encoded using the same
-  // framing used by service-protocol
-  bytes messages = 3;
-}
-
-message SendResponse {
-  oneof response {
-    google.protobuf.Empty ok = 1;
-
-    // This means the provided stream_id is invalid, and it should not be
-    // reused, nor the client should create a new stream using Start(). The
-    // client can instead read the invocation result using GetResult().
-    google.protobuf.Empty invalid_stream = 2;
-
-    // This means the invocation is completed, and the result should be
-    // collected using GetResult
-    google.protobuf.Empty invocation_completed = 3;
-  }
-}
-
-message RecvRequest {
-  // User provided operation id, this is used as idempotency key.
-  string operation_id = 1 [ (dev.restate.ext.field) = KEY ];
-
-  // Stream id to uniquely identify a open stream between client and Restate.
-  // There can be at most one open stream at the same time.
-  string stream_id = 2;
-}
-
-message RecvResponse {
-  oneof response {
-    // Contains the concatenated messages of the stream, encoded using the same
-    // framing used by service-protocol
-    bytes messages = 1;
-
-    // This means the provided stream_id is invalid, and it should not be
-    // reused, nor the client should create a new stream using Start(). The
-    // client can instead read the invocation result using GetResult().
-    google.protobuf.Empty invalid_stream = 2;
-
-    // This means the invocation is completed, and the result should be
-    // collected using GetResult
-    google.protobuf.Empty invocation_completed = 3;
-  }
-}
-
-message GetResultRequest {
-  // User provided operation id, this is used as idempotency key.
-  string operation_id = 1 [ (dev.restate.ext.field) = KEY ];
-}
-
-message GetResultResponse {
-  message InvocationFailure {
-    uint32 code = 1;
-    string message = 2;
-  }
-
-  oneof response {
-    // See GetResult documentation
-    google.protobuf.Empty none = 1;
-    bytes success = 2;
-    InvocationFailure failure = 3;
-  }
-
-  // Timestamp of the response expiry time in RFC3339.
-  // Empty if response = none
-  string expiry_time = 15;
-}
-
-message CleanupRequest {
-  // User provided operation id, this is used as idempotency key.
-  string operation_id = 1 [ (dev.restate.ext.field) = KEY ];
-}
diff --git a/router.go b/router.go
index ac6b2d5..c7c411d 100644
--- a/router.go
+++ b/router.go
@@ -5,30 +5,18 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/cenkalti/backoff/v4"
-	"github.com/restatedev/sdk-go/generated/proto/dynrpc"
 	"github.com/vmihailenco/msgpack/v5"
 )
 
 var (
 	ErrKeyNotFound = fmt.Errorf("key not found")
-	//DefaultBackoffPolicy is an infinite exponential backoff
-	DefaultBackoffPolicy = backoff.ExponentialBackOff{
-		InitialInterval:     10 * time.Microsecond,
-		RandomizationFactor: backoff.DefaultRandomizationFactor,
-		Multiplier:          backoff.DefaultMultiplier,
-		MaxInterval:         backoff.DefaultMaxInterval,
-		MaxElapsedTime:      0,
-		Stop:                backoff.Stop,
-		Clock:               backoff.SystemClock,
-	}
 )
 
 type Call interface {
 	// Do makes a call and wait for the response
-	Do(key string, input any, output any) error
+	Do(input any, output any) error
 	// Send makes a call in the background (doesn't wait for response) after delay duration
-	Send(key string, body any, delay time.Duration) error
+	Send(body any, delay time.Duration) error
 }
 
 type Service interface {
@@ -36,6 +24,11 @@ type Service interface {
 	Method(method string) Call
 }
 
+type Object interface {
+	// Method creates a call to method with name
+	Method(method string) Call
+}
+
 type Context interface {
 	// Context of request.
 	Ctx() context.Context
@@ -60,13 +53,16 @@ type Context interface {
 	// Service gets a Service accessor by name where service
 	// must be another service known by restate runtime
 	Service(service string) Service
+	// Object gets a Object accessor by name where object
+	// must be another object known by restate runtime and
+	// key is any string representing the key for the object
+	Object(object, key string) Object
 
-	// SideEffects runs the function (fn) with backoff strategy bo until it succeeds
-	// or permanently fail.
+	// SideEffects runs the function (fn) until it succeeds or permanently fails.
 	// this stores the results of the function inside restate runtime so a replay
 	// will produce the same value (think generating a unique id for example)
 	// Note: use the SideEffectAs helper function
-	SideEffect(fn func() ([]byte, error), bo ...backoff.BackOff) ([]byte, error)
+	SideEffect(fn func() ([]byte, error)) ([]byte, error)
 }
 
 // UnKeyedHandlerFn signature of `un-keyed` handler function
@@ -77,7 +73,7 @@ type KeyedHandlerFn[I any, O any] func(ctx Context, key string, input I) (output
 
 // Handler interface.
 type Handler interface {
-	Call(ctx Context, request *dynrpc.RpcRequest) (output *dynrpc.RpcResponse, err error)
+	Call(ctx Context, key string, request []byte) (output []byte, err error)
 	sealed()
 }
 
@@ -171,7 +167,7 @@ func SetAs[T any](ctx Context, key string, value T) error {
 
 // SideEffectAs helper function runs a side effect function with specific concrete type as a result
 // it does encoding/decoding of bytes automatically using msgpack
-func SideEffectAs[T any](ctx Context, fn func() (T, error), bo ...backoff.BackOff) (output T, err error) {
+func SideEffectAs[T any](ctx Context, fn func() (T, error)) (output T, err error) {
 	bytes, err := ctx.SideEffect(func() ([]byte, error) {
 		out, err := fn()
 		if err != nil {
@@ -180,7 +176,7 @@ func SideEffectAs[T any](ctx Context, fn func() (T, error), bo ...backoff.BackOf
 
 		bytes, err := msgpack.Marshal(out)
 		return bytes, TerminalError(err)
-	}, bo...)
+	})
 
 	if err != nil {
 		return output, err
diff --git a/server/restate.go b/server/restate.go
index caf0fb6..3c506c9 100644
--- a/server/restate.go
+++ b/server/restate.go
@@ -2,21 +2,43 @@ package server
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net"
 	"net/http"
+	"runtime/debug"
 	"strings"
 
 	"github.com/posener/h2conn"
-	"github.com/restatedev/sdk-go"
+	restate "github.com/restatedev/sdk-go"
 	"github.com/restatedev/sdk-go/generated/proto/discovery"
+	"github.com/restatedev/sdk-go/generated/proto/protocol"
 	"github.com/restatedev/sdk-go/internal"
 	"github.com/restatedev/sdk-go/internal/state"
 	"github.com/rs/zerolog/log"
 	"golang.org/x/net/http2"
-	"google.golang.org/protobuf/proto"
 )
 
+const MIN_SERVICE_PROTOCOL_VERSION protocol.ServiceProtocolVersion = protocol.ServiceProtocolVersion_V1
+const MAX_SERVICE_PROTOCOL_VERSION protocol.ServiceProtocolVersion = protocol.ServiceProtocolVersion_V1
+const MIN_SERVICE_DISCOVERY_PROTOCOL_VERSION discovery.ServiceDiscoveryProtocolVersion = discovery.ServiceDiscoveryProtocolVersion_V1
+const MAX_SERVICE_DISCOVERY_PROTOCOL_VERSION discovery.ServiceDiscoveryProtocolVersion = discovery.ServiceDiscoveryProtocolVersion_V1
+
+var X_RESTATE_SERVER = `restate-sdk-go/unknown`
+
+func init() {
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	for _, dep := range bi.Deps {
+		if dep.Path == "github.com/restatedev/sdk-go" {
+			X_RESTATE_SERVER = "restate-sdk-go/" + dep.Version
+			break
+		}
+	}
+}
+
 type Restate struct {
 	routers map[string]restate.Router
 }
@@ -40,39 +62,62 @@ func (r *Restate) Bind(name string, router restate.Router) *Restate {
 	return r
 }
 
-func (r *Restate) discover() (resource *discovery.ServiceDiscoveryResponse, err error) {
-	ds := internal.NewDynRpcDescriptorSet()
-	resource = &discovery.ServiceDiscoveryResponse{
-		ProtocolMode: discovery.ProtocolMode_BIDI_STREAM,
-		Files:        ds.Inner(),
+func (r *Restate) discover() (resource *internal.Endpoint, err error) {
+	resource = &internal.Endpoint{
+		ProtocolMode:       internal.ProtocolMode_BIDI_STREAM,
+		MinProtocolVersion: 1,
+		MaxProtocolVersion: 2,
+		Services:           make([]internal.Service, 0, len(r.routers)),
 	}
 
 	for name, router := range r.routers {
-		resource.Services = append(resource.Services, name)
-		var service *internal.DynRpcService
+		serviceType := internal.ServiceType_SERVICE
 		if router.Keyed() {
-			service, err = ds.AddKeyedService(name)
-		} else {
-			service, err = ds.AddUnKeyedService(name)
+			serviceType = internal.ServiceType_VIRTUAL_OBJECT
 		}
-
-		if err != nil {
-			return resource, fmt.Errorf("failed to build service '%s': %w", name, err)
+		service := internal.Service{
+			Name:     name,
+			Ty:       serviceType,
+			Handlers: make([]internal.Handler, 0, len(router.Handlers())),
 		}
 
 		for name := range router.Handlers() {
-			service.AddHandler(name)
+			service.Handlers = append(service.Handlers, internal.Handler{
+				Name: name,
+				Input: &internal.InputPayload{
+					Required:    false,
+					ContentType: "application/json", // TODO configurable handler encoding
+				},
+				Output: &internal.OutputPayload{
+					SetContentTypeIfEmpty: false,
+					ContentType:           "application/json",
+				},
+			})
 		}
+		resource.Services = append(resource.Services, service)
 	}
 
-	resource.Files = ds.Inner()
-
 	return
 }
 
-func (r *Restate) discoverHandler(writer http.ResponseWriter, _ *http.Request) {
+func (r *Restate) discoverHandler(writer http.ResponseWriter, req *http.Request) {
 	log.Trace().Msg("discover called")
-	writer.Header().Add("Content-Type", "application/proto")
+
+	acceptVersionsString := req.Header.Get("accept")
+	if acceptVersionsString == "" {
+		writer.Write([]byte("missing accept header"))
+		writer.WriteHeader(http.StatusUnsupportedMediaType)
+
+		return
+	}
+
+	serviceDiscoveryProtocolVersion := selectSupportedServiceDiscoveryProtocolVersion(acceptVersionsString)
+
+	if serviceDiscoveryProtocolVersion == discovery.ServiceDiscoveryProtocolVersion_SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED {
+		writer.Write([]byte(fmt.Sprint("Unsupported service discovery protocol version '%s'", acceptVersionsString)))
+		writer.WriteHeader(http.StatusUnsupportedMediaType)
+		return
+	}
 
 	response, err := r.discover()
 	if err != nil {
@@ -82,7 +127,7 @@ func (r *Restate) discoverHandler(writer http.ResponseWriter, _ *http.Request) {
 		return
 	}
 
-	bytes, err := proto.Marshal(response)
+	bytes, err := json.Marshal(response)
 	if err != nil {
 		writer.Write([]byte(err.Error()))
 		writer.WriteHeader(http.StatusInternalServerError)
@@ -90,17 +135,72 @@ func (r *Restate) discoverHandler(writer http.ResponseWriter, _ *http.Request) {
 		return
 	}
 
+	writer.Header().Add("Content-Type", serviceDiscoveryProtocolVersionToHeaderValue(serviceDiscoveryProtocolVersion))
 	writer.WriteHeader(200)
 	if _, err := writer.Write(bytes); err != nil {
 		log.Error().Err(err).Msg("failed to write discovery information")
 	}
 }
 
+func selectSupportedServiceDiscoveryProtocolVersion(accept string) discovery.ServiceDiscoveryProtocolVersion {
+	maxVersion := discovery.ServiceDiscoveryProtocolVersion_SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED
+
+	for _, versionString := range strings.Split(accept, ",") {
+		version := parseServiceDiscoveryProtocolVersion(versionString)
+		if isServiceDiscoveryProtocolVersionSupported(version) && version > maxVersion {
+			maxVersion = version
+		}
+	}
+
+	return maxVersion
+}
+
+func parseServiceDiscoveryProtocolVersion(versionString string) discovery.ServiceDiscoveryProtocolVersion {
+	if strings.TrimSpace(versionString) == "application/vnd.restate.endpointmanifest.v1+json" {
+		return discovery.ServiceDiscoveryProtocolVersion_V1
+	}
+
+	return discovery.ServiceDiscoveryProtocolVersion_SERVICE_DISCOVERY_PROTOCOL_VERSION_UNSPECIFIED
+}
+
+func isServiceDiscoveryProtocolVersionSupported(version discovery.ServiceDiscoveryProtocolVersion) bool {
+	return version >= MIN_SERVICE_DISCOVERY_PROTOCOL_VERSION && version <= MAX_SERVICE_DISCOVERY_PROTOCOL_VERSION
+}
+
+func serviceDiscoveryProtocolVersionToHeaderValue(serviceDiscoveryProtocolVersion discovery.ServiceDiscoveryProtocolVersion) string {
+	switch serviceDiscoveryProtocolVersion {
+	case discovery.ServiceDiscoveryProtocolVersion_V1:
+		return "application/vnd.restate.endpointmanifest.v1+json"
+	}
+	panic(fmt.Sprintf("unexpected service discovery protocol version %d", serviceDiscoveryProtocolVersion))
+}
+
+func parseServiceProtocolVersion(versionString string) protocol.ServiceProtocolVersion {
+	if strings.TrimSpace(versionString) == "application/vnd.restate.invocation.v1" {
+		return protocol.ServiceProtocolVersion_V1
+	}
+
+	return protocol.ServiceProtocolVersion_SERVICE_PROTOCOL_VERSION_UNSPECIFIED
+}
+
+func isServiceProtocolVersionSupported(version protocol.ServiceProtocolVersion) bool {
+	return version >= MIN_SERVICE_PROTOCOL_VERSION && version <= MAX_SERVICE_PROTOCOL_VERSION
+}
+
+func serviceProtocolVersionToHeaderValue(serviceProtocolVersion protocol.ServiceProtocolVersion) string {
+	switch serviceProtocolVersion {
+	case protocol.ServiceProtocolVersion_V1:
+		return "application/vnd.restate.invocation.v1"
+	}
+	panic(fmt.Sprintf("unexpected service protocol version %d", serviceProtocolVersion))
+}
+
 // takes care of function call
-func (r *Restate) callHandler(service, fn string, writer http.ResponseWriter, request *http.Request) {
+func (r *Restate) callHandler(serviceProtocolVersion protocol.ServiceProtocolVersion, service, fn string, writer http.ResponseWriter, request *http.Request) {
 	log.Debug().Str("service", service).Str("handler", fn).Msg("new request")
 
-	writer.Header().Add("content-type", "application/restate")
+	writer.Header().Add("x-restate-server", X_RESTATE_SERVER)
+	writer.Header().Add("content-type", serviceProtocolVersionToHeaderValue(serviceProtocolVersion))
 
 	router, ok := r.routers[service]
 	if !ok {
@@ -133,15 +233,28 @@ func (r *Restate) callHandler(service, fn string, writer http.ResponseWriter, re
 func (r *Restate) handler(writer http.ResponseWriter, request *http.Request) {
 	log.Trace().Str("proto", request.Proto).Str("method", request.Method).Str("path", request.RequestURI).Msg("got request")
 
-	if request.Method != http.MethodPost {
-		writer.WriteHeader(http.StatusMethodNotAllowed)
+	if request.RequestURI == "/discover" {
+		r.discoverHandler(writer, request)
 		return
 	}
 
-	if request.RequestURI == "/discover" {
-		r.discoverHandler(writer, request)
+	serviceProtocolVersionString := request.Header.Get("content-type")
+	if serviceProtocolVersionString == "" {
+		writer.Write([]byte("missing content-type header"))
+		writer.WriteHeader(http.StatusUnsupportedMediaType)
+
 		return
 	}
+
+	serviceProtocolVersion := parseServiceProtocolVersion(serviceProtocolVersionString)
+
+	if !isServiceProtocolVersionSupported(serviceProtocolVersion) {
+		writer.Write([]byte(fmt.Sprintf("Unsupported service protocol version '%s'", serviceProtocolVersionString)))
+		writer.WriteHeader(http.StatusUnsupportedMediaType)
+
+		return
+	}
+
 	// we expecting the uri to be something like `/invoke/{service}/{method}`
 	// so
 	if !strings.HasPrefix(request.RequestURI, "/invoke/") {
@@ -155,7 +268,7 @@ func (r *Restate) handler(writer http.ResponseWriter, request *http.Request) {
 		return
 	}
 
-	r.callHandler(parts[0], parts[1], writer, request)
+	r.callHandler(serviceProtocolVersion, parts[0], parts[1], writer, request)
 }
 
 func (r *Restate) Start(ctx context.Context, address string) error {