diff --git a/gen/optable/external/v1/cleanroom.pb.go b/gen/optable/external/v1/cleanroom.pb.go
index 6f49011..9724f68 100644
--- a/gen/optable/external/v1/cleanroom.pb.go
+++ b/gen/optable/external/v1/cleanroom.pb.go
@@ -646,7 +646,8 @@ type Cleanroom_Participant struct {
 	// Update time of the participant.
 	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
 	// Invitation update time for the participant.
-	InvitationUpdateTime *timestamppb.Timestamp `protobuf:"bytes,3,opt,name=invitation_update_time,json=invitationUpdateTime,proto3" json:"invitation_update_time,omitempty"`
+	InvitationUpdateTime *timestamppb.Timestamp       `protobuf:"bytes,3,opt,name=invitation_update_time,json=invitationUpdateTime,proto3" json:"invitation_update_time,omitempty"`
+	Error                *Cleanroom_Participant_Error `protobuf:"bytes,5,opt,name=error,proto3" json:"error,omitempty"`
 	// Role of the participant.
 	Role Cleanroom_Participant_Role `protobuf:"varint,4,opt,name=role,proto3,enum=optable.external.v1.Cleanroom_Participant_Role" json:"role,omitempty"`
 }
@@ -702,6 +703,13 @@ func (x *Cleanroom_Participant) GetInvitationUpdateTime() *timestamppb.Timestamp
 	return nil
 }
 
+func (x *Cleanroom_Participant) GetError() *Cleanroom_Participant_Error {
+	if x != nil {
+		return x.Error
+	}
+	return nil
+}
+
 func (x *Cleanroom_Participant) GetRole() Cleanroom_Participant_Role {
 	if x != nil {
 		return x.Role
@@ -845,6 +853,61 @@ func (x *Cleanroom_Config_PairConfig_AuthToken) GetExpireTime() *timestamppb.Tim
 	return nil
 }
 
+type Cleanroom_Participant_Error struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Error code.
+	Code string `protobuf:"bytes,1,opt,name=code,proto3" json:"code,omitempty"`
+	// Error message.
+	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+}
+
+func (x *Cleanroom_Participant_Error) Reset() {
+	*x = Cleanroom_Participant_Error{}
+	mi := &file_optable_external_v1_cleanroom_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Cleanroom_Participant_Error) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Cleanroom_Participant_Error) ProtoMessage() {}
+
+func (x *Cleanroom_Participant_Error) ProtoReflect() protoreflect.Message {
+	mi := &file_optable_external_v1_cleanroom_proto_msgTypes[7]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Cleanroom_Participant_Error.ProtoReflect.Descriptor instead.
+func (*Cleanroom_Participant_Error) Descriptor() ([]byte, []int) {
+	return file_optable_external_v1_cleanroom_proto_rawDescGZIP(), []int{0, 1, 0}
+}
+
+func (x *Cleanroom_Participant_Error) GetCode() string {
+	if x != nil {
+		return x.Code
+	}
+	return ""
+}
+
+func (x *Cleanroom_Participant_Error) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
 var File_optable_external_v1_cleanroom_proto protoreflect.FileDescriptor
 
 var file_optable_external_v1_cleanroom_proto_rawDesc = []byte{
@@ -857,7 +920,7 @@ var file_optable_external_v1_cleanroom_proto_rawDesc = []byte{
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@@ -934,7 +997,7 @@ var file_optable_external_v1_cleanroom_proto_rawDesc = []byte{
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@@ -950,73 +1013,82 @@ var file_optable_external_v1_cleanroom_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1032,7 +1104,7 @@ func file_optable_external_v1_cleanroom_proto_rawDescGZIP() []byte {
 }
 
 var file_optable_external_v1_cleanroom_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
-var file_optable_external_v1_cleanroom_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
+var file_optable_external_v1_cleanroom_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
 var file_optable_external_v1_cleanroom_proto_goTypes = []any{
 	(Cleanroom_State)(0),                          // 0: optable.external.v1.Cleanroom.State
 	(Cleanroom_Type)(0),                           // 1: optable.external.v1.Cleanroom.Type
@@ -1046,12 +1118,13 @@ var file_optable_external_v1_cleanroom_proto_goTypes = []any{
 	(*Cleanroom_Participant)(nil),                 // 9: optable.external.v1.Cleanroom.Participant
 	(*Cleanroom_Config_PairConfig)(nil),           // 10: optable.external.v1.Cleanroom.Config.PairConfig
 	(*Cleanroom_Config_PairConfig_AuthToken)(nil), // 11: optable.external.v1.Cleanroom.Config.PairConfig.AuthToken
-	(*timestamppb.Timestamp)(nil),                 // 12: google.protobuf.Timestamp
+	(*Cleanroom_Participant_Error)(nil),           // 12: optable.external.v1.Cleanroom.Participant.Error
+	(*timestamppb.Timestamp)(nil),                 // 13: google.protobuf.Timestamp
 }
 var file_optable_external_v1_cleanroom_proto_depIdxs = []int32{
-	12, // 0: optable.external.v1.Cleanroom.create_time:type_name -> google.protobuf.Timestamp
-	12, // 1: optable.external.v1.Cleanroom.update_time:type_name -> google.protobuf.Timestamp
-	12, // 2: optable.external.v1.Cleanroom.expire_time:type_name -> google.protobuf.Timestamp
+	13, // 0: optable.external.v1.Cleanroom.create_time:type_name -> google.protobuf.Timestamp
+	13, // 1: optable.external.v1.Cleanroom.update_time:type_name -> google.protobuf.Timestamp
+	13, // 2: optable.external.v1.Cleanroom.expire_time:type_name -> google.protobuf.Timestamp
 	0,  // 3: optable.external.v1.Cleanroom.state:type_name -> optable.external.v1.Cleanroom.State
 	1,  // 4: optable.external.v1.Cleanroom.type:type_name -> optable.external.v1.Cleanroom.Type
 	8,  // 5: optable.external.v1.Cleanroom.config:type_name -> optable.external.v1.Cleanroom.Config
@@ -1059,16 +1132,17 @@ var file_optable_external_v1_cleanroom_proto_depIdxs = []int32{
 	4,  // 7: optable.external.v1.GetCleanroomRequest.view:type_name -> optable.external.v1.GetCleanroomRequest.View
 	10, // 8: optable.external.v1.Cleanroom.Config.pair:type_name -> optable.external.v1.Cleanroom.Config.PairConfig
 	2,  // 9: optable.external.v1.Cleanroom.Participant.state:type_name -> optable.external.v1.Cleanroom.Participant.State
-	12, // 10: optable.external.v1.Cleanroom.Participant.update_time:type_name -> google.protobuf.Timestamp
-	12, // 11: optable.external.v1.Cleanroom.Participant.invitation_update_time:type_name -> google.protobuf.Timestamp
-	3,  // 12: optable.external.v1.Cleanroom.Participant.role:type_name -> optable.external.v1.Cleanroom.Participant.Role
-	11, // 13: optable.external.v1.Cleanroom.Config.PairConfig.gcs_token:type_name -> optable.external.v1.Cleanroom.Config.PairConfig.AuthToken
-	12, // 14: optable.external.v1.Cleanroom.Config.PairConfig.AuthToken.expire_time:type_name -> google.protobuf.Timestamp
-	15, // [15:15] is the sub-list for method output_type
-	15, // [15:15] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension type_name
-	15, // [15:15] is the sub-list for extension extendee
-	0,  // [0:15] is the sub-list for field type_name
+	13, // 10: optable.external.v1.Cleanroom.Participant.update_time:type_name -> google.protobuf.Timestamp
+	13, // 11: optable.external.v1.Cleanroom.Participant.invitation_update_time:type_name -> google.protobuf.Timestamp
+	12, // 12: optable.external.v1.Cleanroom.Participant.error:type_name -> optable.external.v1.Cleanroom.Participant.Error
+	3,  // 13: optable.external.v1.Cleanroom.Participant.role:type_name -> optable.external.v1.Cleanroom.Participant.Role
+	11, // 14: optable.external.v1.Cleanroom.Config.PairConfig.gcs_token:type_name -> optable.external.v1.Cleanroom.Config.PairConfig.AuthToken
+	13, // 15: optable.external.v1.Cleanroom.Config.PairConfig.AuthToken.expire_time:type_name -> google.protobuf.Timestamp
+	16, // [16:16] is the sub-list for method output_type
+	16, // [16:16] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_optable_external_v1_cleanroom_proto_init() }
@@ -1085,7 +1159,7 @@ func file_optable_external_v1_cleanroom_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_optable_external_v1_cleanroom_proto_rawDesc,
 			NumEnums:      5,
-			NumMessages:   7,
+			NumMessages:   8,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/optable/external/v1/cleanroom.proto b/proto/optable/external/v1/cleanroom.proto
index 7ffb9cf..5317664 100644
--- a/proto/optable/external/v1/cleanroom.proto
+++ b/proto/optable/external/v1/cleanroom.proto
@@ -141,6 +141,16 @@ message Cleanroom {
     // Invitation update time for the participant.
     google.protobuf.Timestamp invitation_update_time = 3 [(google.api.field_behavior) = OUTPUT_ONLY];
 
+    message Error {
+      // Error code.
+      string code = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+      // Error message.
+      string message = 2 [(google.api.field_behavior) = OUTPUT_ONLY];
+    }
+
+    Error error = 5 [(google.api.field_behavior) = OUTPUT_ONLY];
+
     //buf:lint:ignore ENUM_VALUE_PREFIX
     enum Role {
       // Unspecified role.