diff --git a/backend/controller/console.go b/backend/controller/console.go
index 513124d125..e19f9a0049 100644
--- a/backend/controller/console.go
+++ b/backend/controller/console.go
@@ -143,7 +143,7 @@ func (c *ConsoleService) GetModules(ctx context.Context, req *connect.Request[pb
 					Config: c,
 				})
 
-			case *schema.Database, *schema.Enum, *schema.TypeAlias, *schema.FSM:
+			case *schema.Database, *schema.Enum, *schema.TypeAlias, *schema.FSM, *schema.Topic, *schema.Subscription:
 			}
 		}
 
diff --git a/backend/controller/ingress/alias.go b/backend/controller/ingress/alias.go
index b767aa993c..778bf46934 100644
--- a/backend/controller/ingress/alias.go
+++ b/backend/controller/ingress/alias.go
@@ -65,7 +65,7 @@ func transformAliasedFields(sch *schema.Schema, t schema.Type, obj any, aliaser
 			}
 		case *schema.TypeAlias:
 			return transformAliasedFields(sch, decl.Type, obj, aliaser)
-		case *schema.Config, *schema.Database, *schema.FSM, *schema.Secret, *schema.Verb:
+		case *schema.Config, *schema.Database, *schema.FSM, *schema.Secret, *schema.Verb, *schema.Topic, *schema.Subscription:
 			return fmt.Errorf("%s: unsupported ref type %T", t.Pos, decl)
 		}
 
diff --git a/backend/controller/ingress/ingress.go b/backend/controller/ingress/ingress.go
index 6b73cdfd1b..ce6f3ceb5a 100644
--- a/backend/controller/ingress/ingress.go
+++ b/backend/controller/ingress/ingress.go
@@ -247,7 +247,7 @@ func validateValue(fieldType schema.Type, path path, value any, sch *schema.Sche
 				return fmt.Errorf("%s is not a valid variant of enum %s", inputName, fieldType)
 			}
 
-		case *schema.Config, *schema.Database, *schema.Secret, *schema.Verb, *schema.FSM:
+		case *schema.Config, *schema.Database, *schema.Secret, *schema.Verb, *schema.FSM, *schema.Topic, *schema.Subscription:
 
 		}
 
diff --git a/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go b/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
index 0a5a892361..3d1969b349 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
@@ -519,6 +519,8 @@ type Decl struct {
 	//	*Decl_Config
 	//	*Decl_Secret
 	//	*Decl_Fsm
+	//	*Decl_Topic
+	//	*Decl_Subscription
 	Value isDecl_Value `protobuf_oneof:"value"`
 }
 
@@ -617,6 +619,20 @@ func (x *Decl) GetFsm() *FSM {
 	return nil
 }
 
+func (x *Decl) GetTopic() *Topic {
+	if x, ok := x.GetValue().(*Decl_Topic); ok {
+		return x.Topic
+	}
+	return nil
+}
+
+func (x *Decl) GetSubscription() *Subscription {
+	if x, ok := x.GetValue().(*Decl_Subscription); ok {
+		return x.Subscription
+	}
+	return nil
+}
+
 type isDecl_Value interface {
 	isDecl_Value()
 }
@@ -653,6 +669,14 @@ type Decl_Fsm struct {
 	Fsm *FSM `protobuf:"bytes,8,opt,name=fsm,proto3,oneof"`
 }
 
+type Decl_Topic struct {
+	Topic *Topic `protobuf:"bytes,9,opt,name=topic,proto3,oneof"`
+}
+
+type Decl_Subscription struct {
+	Subscription *Subscription `protobuf:"bytes,10,opt,name=subscription,proto3,oneof"`
+}
+
 func (*Decl_Data) isDecl_Value() {}
 
 func (*Decl_Verb) isDecl_Value() {}
@@ -669,6 +693,10 @@ func (*Decl_Secret) isDecl_Value() {}
 
 func (*Decl_Fsm) isDecl_Value() {}
 
+func (*Decl_Topic) isDecl_Value() {}
+
+func (*Decl_Subscription) isDecl_Value() {}
+
 type Enum struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1598,6 +1626,7 @@ type Metadata struct {
 	//	*Metadata_Databases
 	//	*Metadata_Alias
 	//	*Metadata_Retry
+	//	*Metadata_Subscriber
 	Value isMetadata_Value `protobuf_oneof:"value"`
 }
 
@@ -1682,6 +1711,13 @@ func (x *Metadata) GetRetry() *MetadataRetry {
 	return nil
 }
 
+func (x *Metadata) GetSubscriber() *MetadataSubscriber {
+	if x, ok := x.GetValue().(*Metadata_Subscriber); ok {
+		return x.Subscriber
+	}
+	return nil
+}
+
 type isMetadata_Value interface {
 	isMetadata_Value()
 }
@@ -1710,6 +1746,10 @@ type Metadata_Retry struct {
 	Retry *MetadataRetry `protobuf:"bytes,6,opt,name=retry,proto3,oneof"`
 }
 
+type Metadata_Subscriber struct {
+	Subscriber *MetadataSubscriber `protobuf:"bytes,7,opt,name=subscriber,proto3,oneof"`
+}
+
 func (*Metadata_Calls) isMetadata_Value() {}
 
 func (*Metadata_Ingress) isMetadata_Value() {}
@@ -1722,6 +1762,8 @@ func (*Metadata_Alias) isMetadata_Value() {}
 
 func (*Metadata_Retry) isMetadata_Value() {}
 
+func (*Metadata_Subscriber) isMetadata_Value() {}
+
 type MetadataAlias struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2092,6 +2134,61 @@ func (x *MetadataRetry) GetMaxBackoff() string {
 	return ""
 }
 
+type MetadataSubscriber struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Pos  *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Name string    `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+}
+
+func (x *MetadataSubscriber) Reset() {
+	*x = MetadataSubscriber{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MetadataSubscriber) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MetadataSubscriber) ProtoMessage() {}
+
+func (x *MetadataSubscriber) ProtoReflect() protoreflect.Message {
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29]
+	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 MetadataSubscriber.ProtoReflect.Descriptor instead.
+func (*MetadataSubscriber) Descriptor() ([]byte, []int) {
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{29}
+}
+
+func (x *MetadataSubscriber) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
+func (x *MetadataSubscriber) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 type Module struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2108,7 +2205,7 @@ type Module struct {
 func (x *Module) Reset() {
 	*x = Module{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2121,7 +2218,7 @@ func (x *Module) String() string {
 func (*Module) ProtoMessage() {}
 
 func (x *Module) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2134,7 +2231,7 @@ func (x *Module) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Module.ProtoReflect.Descriptor instead.
 func (*Module) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{29}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{30}
 }
 
 func (x *Module) GetRuntime() *ModuleRuntime {
@@ -2191,7 +2288,7 @@ type Optional struct {
 func (x *Optional) Reset() {
 	*x = Optional{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2204,7 +2301,7 @@ func (x *Optional) String() string {
 func (*Optional) ProtoMessage() {}
 
 func (x *Optional) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2217,7 +2314,7 @@ func (x *Optional) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Optional.ProtoReflect.Descriptor instead.
 func (*Optional) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{30}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{31}
 }
 
 func (x *Optional) GetPos() *Position {
@@ -2247,7 +2344,7 @@ type Position struct {
 func (x *Position) Reset() {
 	*x = Position{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2260,7 +2357,7 @@ func (x *Position) String() string {
 func (*Position) ProtoMessage() {}
 
 func (x *Position) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2273,7 +2370,7 @@ func (x *Position) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Position.ProtoReflect.Descriptor instead.
 func (*Position) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{31}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{32}
 }
 
 func (x *Position) GetFilename() string {
@@ -2311,7 +2408,7 @@ type Ref struct {
 func (x *Ref) Reset() {
 	*x = Ref{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2324,7 +2421,7 @@ func (x *Ref) String() string {
 func (*Ref) ProtoMessage() {}
 
 func (x *Ref) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2337,7 +2434,7 @@ func (x *Ref) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Ref.ProtoReflect.Descriptor instead.
 func (*Ref) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{32}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{33}
 }
 
 func (x *Ref) GetPos() *Position {
@@ -2380,7 +2477,7 @@ type Schema struct {
 func (x *Schema) Reset() {
 	*x = Schema{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2393,7 +2490,7 @@ func (x *Schema) String() string {
 func (*Schema) ProtoMessage() {}
 
 func (x *Schema) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2406,7 +2503,7 @@ func (x *Schema) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Schema.ProtoReflect.Descriptor instead.
 func (*Schema) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{33}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *Schema) GetPos() *Position {
@@ -2437,7 +2534,7 @@ type Secret struct {
 func (x *Secret) Reset() {
 	*x = Secret{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2450,7 +2547,7 @@ func (x *Secret) String() string {
 func (*Secret) ProtoMessage() {}
 
 func (x *Secret) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2463,7 +2560,7 @@ func (x *Secret) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Secret.ProtoReflect.Descriptor instead.
 func (*Secret) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{34}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *Secret) GetPos() *Position {
@@ -2505,7 +2602,7 @@ type String struct {
 func (x *String) Reset() {
 	*x = String{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2518,7 +2615,7 @@ func (x *String) String() string {
 func (*String) ProtoMessage() {}
 
 func (x *String) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2531,7 +2628,7 @@ func (x *String) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use String.ProtoReflect.Descriptor instead.
 func (*String) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{35}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *String) GetPos() *Position {
@@ -2553,7 +2650,7 @@ type StringValue struct {
 func (x *StringValue) Reset() {
 	*x = StringValue{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2566,7 +2663,7 @@ func (x *StringValue) String() string {
 func (*StringValue) ProtoMessage() {}
 
 func (x *StringValue) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2579,7 +2676,7 @@ func (x *StringValue) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringValue.ProtoReflect.Descriptor instead.
 func (*StringValue) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{36}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{37}
 }
 
 func (x *StringValue) GetPos() *Position {
@@ -2596,6 +2693,77 @@ func (x *StringValue) GetValue() string {
 	return ""
 }
 
+type Subscription struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Pos      *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Comments []string  `protobuf:"bytes,2,rep,name=comments,proto3" json:"comments,omitempty"`
+	Name     string    `protobuf:"bytes,3,opt,name=name,proto3" json:"name,omitempty"`
+	Topic    *Ref      `protobuf:"bytes,4,opt,name=topic,proto3" json:"topic,omitempty"`
+}
+
+func (x *Subscription) Reset() {
+	*x = Subscription{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Subscription) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Subscription) ProtoMessage() {}
+
+func (x *Subscription) ProtoReflect() protoreflect.Message {
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+	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 Subscription.ProtoReflect.Descriptor instead.
+func (*Subscription) Descriptor() ([]byte, []int) {
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{38}
+}
+
+func (x *Subscription) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
+func (x *Subscription) GetComments() []string {
+	if x != nil {
+		return x.Comments
+	}
+	return nil
+}
+
+func (x *Subscription) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *Subscription) GetTopic() *Ref {
+	if x != nil {
+		return x.Topic
+	}
+	return nil
+}
+
 type Time struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2607,7 +2775,7 @@ type Time struct {
 func (x *Time) Reset() {
 	*x = Time{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2620,7 +2788,7 @@ func (x *Time) String() string {
 func (*Time) ProtoMessage() {}
 
 func (x *Time) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2633,7 +2801,7 @@ func (x *Time) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Time.ProtoReflect.Descriptor instead.
 func (*Time) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{37}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{39}
 }
 
 func (x *Time) GetPos() *Position {
@@ -2643,6 +2811,85 @@ func (x *Time) GetPos() *Position {
 	return nil
 }
 
+type Topic struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Pos      *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Comments []string  `protobuf:"bytes,2,rep,name=comments,proto3" json:"comments,omitempty"`
+	Export   bool      `protobuf:"varint,3,opt,name=export,proto3" json:"export,omitempty"`
+	Name     string    `protobuf:"bytes,4,opt,name=name,proto3" json:"name,omitempty"`
+	Event    *Type     `protobuf:"bytes,5,opt,name=event,proto3" json:"event,omitempty"`
+}
+
+func (x *Topic) Reset() {
+	*x = Topic{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Topic) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Topic) ProtoMessage() {}
+
+func (x *Topic) ProtoReflect() protoreflect.Message {
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40]
+	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 Topic.ProtoReflect.Descriptor instead.
+func (*Topic) Descriptor() ([]byte, []int) {
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{40}
+}
+
+func (x *Topic) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
+func (x *Topic) GetComments() []string {
+	if x != nil {
+		return x.Comments
+	}
+	return nil
+}
+
+func (x *Topic) GetExport() bool {
+	if x != nil {
+		return x.Export
+	}
+	return false
+}
+
+func (x *Topic) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *Topic) GetEvent() *Type {
+	if x != nil {
+		return x.Event
+	}
+	return nil
+}
+
 type Type struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2668,7 +2915,7 @@ type Type struct {
 func (x *Type) Reset() {
 	*x = Type{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2681,7 +2928,7 @@ func (x *Type) String() string {
 func (*Type) ProtoMessage() {}
 
 func (x *Type) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2694,7 +2941,7 @@ func (x *Type) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Type.ProtoReflect.Descriptor instead.
 func (*Type) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{38}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{41}
 }
 
 func (m *Type) GetValue() isType_Value {
@@ -2879,7 +3126,7 @@ type TypeAlias struct {
 func (x *TypeAlias) Reset() {
 	*x = TypeAlias{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2892,7 +3139,7 @@ func (x *TypeAlias) String() string {
 func (*TypeAlias) ProtoMessage() {}
 
 func (x *TypeAlias) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2905,7 +3152,7 @@ func (x *TypeAlias) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TypeAlias.ProtoReflect.Descriptor instead.
 func (*TypeAlias) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{39}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *TypeAlias) GetPos() *Position {
@@ -2955,7 +3202,7 @@ type TypeParameter struct {
 func (x *TypeParameter) Reset() {
 	*x = TypeParameter{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2968,7 +3215,7 @@ func (x *TypeParameter) String() string {
 func (*TypeParameter) ProtoMessage() {}
 
 func (x *TypeParameter) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2981,7 +3228,7 @@ func (x *TypeParameter) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TypeParameter.ProtoReflect.Descriptor instead.
 func (*TypeParameter) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{40}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{43}
 }
 
 func (x *TypeParameter) GetPos() *Position {
@@ -3010,7 +3257,7 @@ type TypeValue struct {
 func (x *TypeValue) Reset() {
 	*x = TypeValue{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3023,7 +3270,7 @@ func (x *TypeValue) String() string {
 func (*TypeValue) ProtoMessage() {}
 
 func (x *TypeValue) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3036,7 +3283,7 @@ func (x *TypeValue) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TypeValue.ProtoReflect.Descriptor instead.
 func (*TypeValue) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{41}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{44}
 }
 
 func (x *TypeValue) GetPos() *Position {
@@ -3064,7 +3311,7 @@ type Unit struct {
 func (x *Unit) Reset() {
 	*x = Unit{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[45]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3077,7 +3324,7 @@ func (x *Unit) String() string {
 func (*Unit) ProtoMessage() {}
 
 func (x *Unit) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[45]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3090,7 +3337,7 @@ func (x *Unit) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Unit.ProtoReflect.Descriptor instead.
 func (*Unit) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{42}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{45}
 }
 
 func (x *Unit) GetPos() *Position {
@@ -3116,7 +3363,7 @@ type Value struct {
 func (x *Value) Reset() {
 	*x = Value{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[46]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3129,7 +3376,7 @@ func (x *Value) String() string {
 func (*Value) ProtoMessage() {}
 
 func (x *Value) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[46]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3142,7 +3389,7 @@ func (x *Value) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Value.ProtoReflect.Descriptor instead.
 func (*Value) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{43}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{46}
 }
 
 func (m *Value) GetValue() isValue_Value {
@@ -3213,7 +3460,7 @@ type Verb struct {
 func (x *Verb) Reset() {
 	*x = Verb{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[47]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3226,7 +3473,7 @@ func (x *Verb) String() string {
 func (*Verb) ProtoMessage() {}
 
 func (x *Verb) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44]
+	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[47]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3239,7 +3486,7 @@ func (x *Verb) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Verb.ProtoReflect.Descriptor instead.
 func (*Verb) Descriptor() ([]byte, []int) {
-	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{44}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{47}
 }
 
 func (x *Verb) GetRuntime() *VerbRuntime {
@@ -3371,7 +3618,7 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
 	0x6d, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x03,
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@@ -3400,240 +3647,260 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
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@@ -3847,7 +4138,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP() []byte {
 }
 
 var file_xyz_block_ftl_v1_schema_schema_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_xyz_block_ftl_v1_schema_schema_proto_msgTypes = make([]protoimpl.MessageInfo, 45)
+var file_xyz_block_ftl_v1_schema_schema_proto_msgTypes = make([]protoimpl.MessageInfo, 48)
 var file_xyz_block_ftl_v1_schema_schema_proto_goTypes = []interface{}{
 	(Error_ErrorLevel)(0),        // 0: xyz.block.ftl.v1.schema.Error.ErrorLevel
 	(*Any)(nil),                  // 1: xyz.block.ftl.v1.schema.Any
@@ -3879,134 +4170,145 @@ var file_xyz_block_ftl_v1_schema_schema_proto_goTypes = []interface{}{
 	(*MetadataDatabases)(nil),    // 27: xyz.block.ftl.v1.schema.MetadataDatabases
 	(*MetadataIngress)(nil),      // 28: xyz.block.ftl.v1.schema.MetadataIngress
 	(*MetadataRetry)(nil),        // 29: xyz.block.ftl.v1.schema.MetadataRetry
-	(*Module)(nil),               // 30: xyz.block.ftl.v1.schema.Module
-	(*Optional)(nil),             // 31: xyz.block.ftl.v1.schema.Optional
-	(*Position)(nil),             // 32: xyz.block.ftl.v1.schema.Position
-	(*Ref)(nil),                  // 33: xyz.block.ftl.v1.schema.Ref
-	(*Schema)(nil),               // 34: xyz.block.ftl.v1.schema.Schema
-	(*Secret)(nil),               // 35: xyz.block.ftl.v1.schema.Secret
-	(*String)(nil),               // 36: xyz.block.ftl.v1.schema.String
-	(*StringValue)(nil),          // 37: xyz.block.ftl.v1.schema.StringValue
-	(*Time)(nil),                 // 38: xyz.block.ftl.v1.schema.Time
-	(*Type)(nil),                 // 39: xyz.block.ftl.v1.schema.Type
-	(*TypeAlias)(nil),            // 40: xyz.block.ftl.v1.schema.TypeAlias
-	(*TypeParameter)(nil),        // 41: xyz.block.ftl.v1.schema.TypeParameter
-	(*TypeValue)(nil),            // 42: xyz.block.ftl.v1.schema.TypeValue
-	(*Unit)(nil),                 // 43: xyz.block.ftl.v1.schema.Unit
-	(*Value)(nil),                // 44: xyz.block.ftl.v1.schema.Value
-	(*Verb)(nil),                 // 45: xyz.block.ftl.v1.schema.Verb
-	(*ModuleRuntime)(nil),        // 46: xyz.block.ftl.v1.schema.ModuleRuntime
-	(*VerbRuntime)(nil),          // 47: xyz.block.ftl.v1.schema.VerbRuntime
+	(*MetadataSubscriber)(nil),   // 30: xyz.block.ftl.v1.schema.MetadataSubscriber
+	(*Module)(nil),               // 31: xyz.block.ftl.v1.schema.Module
+	(*Optional)(nil),             // 32: xyz.block.ftl.v1.schema.Optional
+	(*Position)(nil),             // 33: xyz.block.ftl.v1.schema.Position
+	(*Ref)(nil),                  // 34: xyz.block.ftl.v1.schema.Ref
+	(*Schema)(nil),               // 35: xyz.block.ftl.v1.schema.Schema
+	(*Secret)(nil),               // 36: xyz.block.ftl.v1.schema.Secret
+	(*String)(nil),               // 37: xyz.block.ftl.v1.schema.String
+	(*StringValue)(nil),          // 38: xyz.block.ftl.v1.schema.StringValue
+	(*Subscription)(nil),         // 39: xyz.block.ftl.v1.schema.Subscription
+	(*Time)(nil),                 // 40: xyz.block.ftl.v1.schema.Time
+	(*Topic)(nil),                // 41: xyz.block.ftl.v1.schema.Topic
+	(*Type)(nil),                 // 42: xyz.block.ftl.v1.schema.Type
+	(*TypeAlias)(nil),            // 43: xyz.block.ftl.v1.schema.TypeAlias
+	(*TypeParameter)(nil),        // 44: xyz.block.ftl.v1.schema.TypeParameter
+	(*TypeValue)(nil),            // 45: xyz.block.ftl.v1.schema.TypeValue
+	(*Unit)(nil),                 // 46: xyz.block.ftl.v1.schema.Unit
+	(*Value)(nil),                // 47: xyz.block.ftl.v1.schema.Value
+	(*Verb)(nil),                 // 48: xyz.block.ftl.v1.schema.Verb
+	(*ModuleRuntime)(nil),        // 49: xyz.block.ftl.v1.schema.ModuleRuntime
+	(*VerbRuntime)(nil),          // 50: xyz.block.ftl.v1.schema.VerbRuntime
 }
 var file_xyz_block_ftl_v1_schema_schema_proto_depIdxs = []int32{
-	32,  // 0: xyz.block.ftl.v1.schema.Any.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 1: xyz.block.ftl.v1.schema.Array.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 2: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 3: xyz.block.ftl.v1.schema.Bool.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 4: xyz.block.ftl.v1.schema.Bytes.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 5: xyz.block.ftl.v1.schema.Config.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 6: xyz.block.ftl.v1.schema.Config.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 7: xyz.block.ftl.v1.schema.Data.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	41,  // 8: xyz.block.ftl.v1.schema.Data.typeParameters:type_name -> xyz.block.ftl.v1.schema.TypeParameter
+	33,  // 0: xyz.block.ftl.v1.schema.Any.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 1: xyz.block.ftl.v1.schema.Array.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 2: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 3: xyz.block.ftl.v1.schema.Bool.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 4: xyz.block.ftl.v1.schema.Bytes.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 5: xyz.block.ftl.v1.schema.Config.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 6: xyz.block.ftl.v1.schema.Config.type:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 7: xyz.block.ftl.v1.schema.Data.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	44,  // 8: xyz.block.ftl.v1.schema.Data.typeParameters:type_name -> xyz.block.ftl.v1.schema.TypeParameter
 	15,  // 9: xyz.block.ftl.v1.schema.Data.fields:type_name -> xyz.block.ftl.v1.schema.Field
 	23,  // 10: xyz.block.ftl.v1.schema.Data.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	32,  // 11: xyz.block.ftl.v1.schema.Database.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 11: xyz.block.ftl.v1.schema.Database.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	6,   // 12: xyz.block.ftl.v1.schema.Decl.data:type_name -> xyz.block.ftl.v1.schema.Data
-	45,  // 13: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
+	48,  // 13: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
 	7,   // 14: xyz.block.ftl.v1.schema.Decl.database:type_name -> xyz.block.ftl.v1.schema.Database
 	9,   // 15: xyz.block.ftl.v1.schema.Decl.enum:type_name -> xyz.block.ftl.v1.schema.Enum
-	40,  // 16: xyz.block.ftl.v1.schema.Decl.typeAlias:type_name -> xyz.block.ftl.v1.schema.TypeAlias
+	43,  // 16: xyz.block.ftl.v1.schema.Decl.typeAlias:type_name -> xyz.block.ftl.v1.schema.TypeAlias
 	5,   // 17: xyz.block.ftl.v1.schema.Decl.config:type_name -> xyz.block.ftl.v1.schema.Config
-	35,  // 18: xyz.block.ftl.v1.schema.Decl.secret:type_name -> xyz.block.ftl.v1.schema.Secret
+	36,  // 18: xyz.block.ftl.v1.schema.Decl.secret:type_name -> xyz.block.ftl.v1.schema.Secret
 	13,  // 19: xyz.block.ftl.v1.schema.Decl.fsm:type_name -> xyz.block.ftl.v1.schema.FSM
-	32,  // 20: xyz.block.ftl.v1.schema.Enum.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 21: xyz.block.ftl.v1.schema.Enum.type:type_name -> xyz.block.ftl.v1.schema.Type
-	10,  // 22: xyz.block.ftl.v1.schema.Enum.variants:type_name -> xyz.block.ftl.v1.schema.EnumVariant
-	32,  // 23: xyz.block.ftl.v1.schema.EnumVariant.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	44,  // 24: xyz.block.ftl.v1.schema.EnumVariant.value:type_name -> xyz.block.ftl.v1.schema.Value
-	32,  // 25: xyz.block.ftl.v1.schema.Error.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	0,   // 26: xyz.block.ftl.v1.schema.Error.level:type_name -> xyz.block.ftl.v1.schema.Error.ErrorLevel
-	11,  // 27: xyz.block.ftl.v1.schema.ErrorList.errors:type_name -> xyz.block.ftl.v1.schema.Error
-	32,  // 28: xyz.block.ftl.v1.schema.FSM.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 29: xyz.block.ftl.v1.schema.FSM.start:type_name -> xyz.block.ftl.v1.schema.Ref
-	14,  // 30: xyz.block.ftl.v1.schema.FSM.transitions:type_name -> xyz.block.ftl.v1.schema.FSMTransition
-	23,  // 31: xyz.block.ftl.v1.schema.FSM.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	32,  // 32: xyz.block.ftl.v1.schema.FSMTransition.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 33: xyz.block.ftl.v1.schema.FSMTransition.from:type_name -> xyz.block.ftl.v1.schema.Ref
-	33,  // 34: xyz.block.ftl.v1.schema.FSMTransition.to:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 35: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 36: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
-	23,  // 37: xyz.block.ftl.v1.schema.Field.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	32,  // 38: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	18,  // 39: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathLiteral:type_name -> xyz.block.ftl.v1.schema.IngressPathLiteral
-	19,  // 40: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathParameter:type_name -> xyz.block.ftl.v1.schema.IngressPathParameter
-	32,  // 41: xyz.block.ftl.v1.schema.IngressPathLiteral.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 42: xyz.block.ftl.v1.schema.IngressPathParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 43: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 44: xyz.block.ftl.v1.schema.IntValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 45: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 46: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
-	39,  // 47: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
-	25,  // 48: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
-	28,  // 49: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
-	26,  // 50: xyz.block.ftl.v1.schema.Metadata.cronJob:type_name -> xyz.block.ftl.v1.schema.MetadataCronJob
-	27,  // 51: xyz.block.ftl.v1.schema.Metadata.databases:type_name -> xyz.block.ftl.v1.schema.MetadataDatabases
-	24,  // 52: xyz.block.ftl.v1.schema.Metadata.alias:type_name -> xyz.block.ftl.v1.schema.MetadataAlias
-	29,  // 53: xyz.block.ftl.v1.schema.Metadata.retry:type_name -> xyz.block.ftl.v1.schema.MetadataRetry
-	32,  // 54: xyz.block.ftl.v1.schema.MetadataAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 55: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 56: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 57: xyz.block.ftl.v1.schema.MetadataCronJob.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 58: xyz.block.ftl.v1.schema.MetadataDatabases.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 59: xyz.block.ftl.v1.schema.MetadataDatabases.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 60: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	17,  // 61: xyz.block.ftl.v1.schema.MetadataIngress.path:type_name -> xyz.block.ftl.v1.schema.IngressPathComponent
-	32,  // 62: xyz.block.ftl.v1.schema.MetadataRetry.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	46,  // 63: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
-	32,  // 64: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	8,   // 65: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
-	32,  // 66: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 67: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 68: xyz.block.ftl.v1.schema.Ref.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 69: xyz.block.ftl.v1.schema.Ref.typeParameters:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 70: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	30,  // 71: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
-	32,  // 72: xyz.block.ftl.v1.schema.Secret.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 73: xyz.block.ftl.v1.schema.Secret.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 74: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 75: xyz.block.ftl.v1.schema.StringValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 76: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	20,  // 77: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
-	16,  // 78: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
-	36,  // 79: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
-	4,   // 80: xyz.block.ftl.v1.schema.Type.bytes:type_name -> xyz.block.ftl.v1.schema.Bytes
-	3,   // 81: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
-	38,  // 82: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
-	2,   // 83: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
-	22,  // 84: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
-	1,   // 85: xyz.block.ftl.v1.schema.Type.any:type_name -> xyz.block.ftl.v1.schema.Any
-	43,  // 86: xyz.block.ftl.v1.schema.Type.unit:type_name -> xyz.block.ftl.v1.schema.Unit
-	33,  // 87: xyz.block.ftl.v1.schema.Type.ref:type_name -> xyz.block.ftl.v1.schema.Ref
-	31,  // 88: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
-	32,  // 89: xyz.block.ftl.v1.schema.TypeAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 90: xyz.block.ftl.v1.schema.TypeAlias.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 91: xyz.block.ftl.v1.schema.TypeParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 92: xyz.block.ftl.v1.schema.TypeValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 93: xyz.block.ftl.v1.schema.TypeValue.value:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 94: xyz.block.ftl.v1.schema.Unit.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	37,  // 95: xyz.block.ftl.v1.schema.Value.stringValue:type_name -> xyz.block.ftl.v1.schema.StringValue
-	21,  // 96: xyz.block.ftl.v1.schema.Value.intValue:type_name -> xyz.block.ftl.v1.schema.IntValue
-	42,  // 97: xyz.block.ftl.v1.schema.Value.typeValue:type_name -> xyz.block.ftl.v1.schema.TypeValue
-	47,  // 98: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
-	32,  // 99: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 100: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.Type
-	39,  // 101: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.Type
-	23,  // 102: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	103, // [103:103] is the sub-list for method output_type
-	103, // [103:103] is the sub-list for method input_type
-	103, // [103:103] is the sub-list for extension type_name
-	103, // [103:103] is the sub-list for extension extendee
-	0,   // [0:103] is the sub-list for field type_name
+	41,  // 20: xyz.block.ftl.v1.schema.Decl.topic:type_name -> xyz.block.ftl.v1.schema.Topic
+	39,  // 21: xyz.block.ftl.v1.schema.Decl.subscription:type_name -> xyz.block.ftl.v1.schema.Subscription
+	33,  // 22: xyz.block.ftl.v1.schema.Enum.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 23: xyz.block.ftl.v1.schema.Enum.type:type_name -> xyz.block.ftl.v1.schema.Type
+	10,  // 24: xyz.block.ftl.v1.schema.Enum.variants:type_name -> xyz.block.ftl.v1.schema.EnumVariant
+	33,  // 25: xyz.block.ftl.v1.schema.EnumVariant.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	47,  // 26: xyz.block.ftl.v1.schema.EnumVariant.value:type_name -> xyz.block.ftl.v1.schema.Value
+	33,  // 27: xyz.block.ftl.v1.schema.Error.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	0,   // 28: xyz.block.ftl.v1.schema.Error.level:type_name -> xyz.block.ftl.v1.schema.Error.ErrorLevel
+	11,  // 29: xyz.block.ftl.v1.schema.ErrorList.errors:type_name -> xyz.block.ftl.v1.schema.Error
+	33,  // 30: xyz.block.ftl.v1.schema.FSM.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	34,  // 31: xyz.block.ftl.v1.schema.FSM.start:type_name -> xyz.block.ftl.v1.schema.Ref
+	14,  // 32: xyz.block.ftl.v1.schema.FSM.transitions:type_name -> xyz.block.ftl.v1.schema.FSMTransition
+	23,  // 33: xyz.block.ftl.v1.schema.FSM.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	33,  // 34: xyz.block.ftl.v1.schema.FSMTransition.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	34,  // 35: xyz.block.ftl.v1.schema.FSMTransition.from:type_name -> xyz.block.ftl.v1.schema.Ref
+	34,  // 36: xyz.block.ftl.v1.schema.FSMTransition.to:type_name -> xyz.block.ftl.v1.schema.Ref
+	33,  // 37: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 38: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
+	23,  // 39: xyz.block.ftl.v1.schema.Field.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	33,  // 40: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	18,  // 41: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathLiteral:type_name -> xyz.block.ftl.v1.schema.IngressPathLiteral
+	19,  // 42: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathParameter:type_name -> xyz.block.ftl.v1.schema.IngressPathParameter
+	33,  // 43: xyz.block.ftl.v1.schema.IngressPathLiteral.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 44: xyz.block.ftl.v1.schema.IngressPathParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 45: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 46: xyz.block.ftl.v1.schema.IntValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 47: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 48: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
+	42,  // 49: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
+	25,  // 50: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
+	28,  // 51: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
+	26,  // 52: xyz.block.ftl.v1.schema.Metadata.cronJob:type_name -> xyz.block.ftl.v1.schema.MetadataCronJob
+	27,  // 53: xyz.block.ftl.v1.schema.Metadata.databases:type_name -> xyz.block.ftl.v1.schema.MetadataDatabases
+	24,  // 54: xyz.block.ftl.v1.schema.Metadata.alias:type_name -> xyz.block.ftl.v1.schema.MetadataAlias
+	29,  // 55: xyz.block.ftl.v1.schema.Metadata.retry:type_name -> xyz.block.ftl.v1.schema.MetadataRetry
+	30,  // 56: xyz.block.ftl.v1.schema.Metadata.subscriber:type_name -> xyz.block.ftl.v1.schema.MetadataSubscriber
+	33,  // 57: xyz.block.ftl.v1.schema.MetadataAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 58: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	34,  // 59: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.Ref
+	33,  // 60: xyz.block.ftl.v1.schema.MetadataCronJob.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 61: xyz.block.ftl.v1.schema.MetadataDatabases.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	34,  // 62: xyz.block.ftl.v1.schema.MetadataDatabases.calls:type_name -> xyz.block.ftl.v1.schema.Ref
+	33,  // 63: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	17,  // 64: xyz.block.ftl.v1.schema.MetadataIngress.path:type_name -> xyz.block.ftl.v1.schema.IngressPathComponent
+	33,  // 65: xyz.block.ftl.v1.schema.MetadataRetry.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 66: xyz.block.ftl.v1.schema.MetadataSubscriber.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	49,  // 67: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
+	33,  // 68: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	8,   // 69: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
+	33,  // 70: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 71: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 72: xyz.block.ftl.v1.schema.Ref.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 73: xyz.block.ftl.v1.schema.Ref.typeParameters:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 74: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	31,  // 75: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
+	33,  // 76: xyz.block.ftl.v1.schema.Secret.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 77: xyz.block.ftl.v1.schema.Secret.type:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 78: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 79: xyz.block.ftl.v1.schema.StringValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 80: xyz.block.ftl.v1.schema.Subscription.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	34,  // 81: xyz.block.ftl.v1.schema.Subscription.topic:type_name -> xyz.block.ftl.v1.schema.Ref
+	33,  // 82: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 83: xyz.block.ftl.v1.schema.Topic.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 84: xyz.block.ftl.v1.schema.Topic.event:type_name -> xyz.block.ftl.v1.schema.Type
+	20,  // 85: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
+	16,  // 86: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
+	37,  // 87: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
+	4,   // 88: xyz.block.ftl.v1.schema.Type.bytes:type_name -> xyz.block.ftl.v1.schema.Bytes
+	3,   // 89: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
+	40,  // 90: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
+	2,   // 91: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
+	22,  // 92: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
+	1,   // 93: xyz.block.ftl.v1.schema.Type.any:type_name -> xyz.block.ftl.v1.schema.Any
+	46,  // 94: xyz.block.ftl.v1.schema.Type.unit:type_name -> xyz.block.ftl.v1.schema.Unit
+	34,  // 95: xyz.block.ftl.v1.schema.Type.ref:type_name -> xyz.block.ftl.v1.schema.Ref
+	32,  // 96: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
+	33,  // 97: xyz.block.ftl.v1.schema.TypeAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 98: xyz.block.ftl.v1.schema.TypeAlias.type:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 99: xyz.block.ftl.v1.schema.TypeParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33,  // 100: xyz.block.ftl.v1.schema.TypeValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 101: xyz.block.ftl.v1.schema.TypeValue.value:type_name -> xyz.block.ftl.v1.schema.Type
+	33,  // 102: xyz.block.ftl.v1.schema.Unit.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	38,  // 103: xyz.block.ftl.v1.schema.Value.stringValue:type_name -> xyz.block.ftl.v1.schema.StringValue
+	21,  // 104: xyz.block.ftl.v1.schema.Value.intValue:type_name -> xyz.block.ftl.v1.schema.IntValue
+	45,  // 105: xyz.block.ftl.v1.schema.Value.typeValue:type_name -> xyz.block.ftl.v1.schema.TypeValue
+	50,  // 106: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
+	33,  // 107: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	42,  // 108: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.Type
+	42,  // 109: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.Type
+	23,  // 110: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	111, // [111:111] is the sub-list for method output_type
+	111, // [111:111] is the sub-list for method input_type
+	111, // [111:111] is the sub-list for extension type_name
+	111, // [111:111] is the sub-list for extension extendee
+	0,   // [0:111] is the sub-list for field type_name
 }
 
 func init() { file_xyz_block_ftl_v1_schema_schema_proto_init() }
@@ -4365,7 +4667,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Module); i {
+			switch v := v.(*MetadataSubscriber); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4377,7 +4679,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Optional); i {
+			switch v := v.(*Module); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4389,7 +4691,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Position); i {
+			switch v := v.(*Optional); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4401,7 +4703,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Ref); i {
+			switch v := v.(*Position); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4413,7 +4715,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Schema); i {
+			switch v := v.(*Ref); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4425,7 +4727,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Secret); i {
+			switch v := v.(*Schema); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4437,7 +4739,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*String); i {
+			switch v := v.(*Secret); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4449,7 +4751,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringValue); i {
+			switch v := v.(*String); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4461,7 +4763,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Time); i {
+			switch v := v.(*StringValue); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4473,7 +4775,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Type); i {
+			switch v := v.(*Subscription); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4485,7 +4787,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TypeAlias); i {
+			switch v := v.(*Time); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4497,7 +4799,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TypeParameter); i {
+			switch v := v.(*Topic); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4509,7 +4811,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TypeValue); i {
+			switch v := v.(*Type); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4521,7 +4823,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Unit); i {
+			switch v := v.(*TypeAlias); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4533,7 +4835,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Value); i {
+			switch v := v.(*TypeParameter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4545,6 +4847,42 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TypeValue); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[45].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Unit); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[46].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Value); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Verb); i {
 			case 0:
 				return &v.state
@@ -4573,6 +4911,8 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 		(*Decl_Config)(nil),
 		(*Decl_Secret)(nil),
 		(*Decl_Fsm)(nil),
+		(*Decl_Topic)(nil),
+		(*Decl_Subscription)(nil),
 	}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[8].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[9].OneofWrappers = []interface{}{}
@@ -4596,6 +4936,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 		(*Metadata_Databases)(nil),
 		(*Metadata_Alias)(nil),
 		(*Metadata_Retry)(nil),
+		(*Metadata_Subscriber)(nil),
 	}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[23].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[24].OneofWrappers = []interface{}{}
@@ -4605,13 +4946,16 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[28].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[29].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[30].OneofWrappers = []interface{}{}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[31].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[33].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[35].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37].OneofWrappers = []interface{}{}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38].OneofWrappers = []interface{}{
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41].OneofWrappers = []interface{}{
 		(*Type_Int)(nil),
 		(*Type_Float)(nil),
 		(*Type_String_)(nil),
@@ -4625,23 +4969,23 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 		(*Type_Ref)(nil),
 		(*Type_Optional)(nil),
 	}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39].OneofWrappers = []interface{}{}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40].OneofWrappers = []interface{}{}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[41].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[42].OneofWrappers = []interface{}{}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43].OneofWrappers = []interface{}{
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[43].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[45].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[46].OneofWrappers = []interface{}{
 		(*Value_StringValue)(nil),
 		(*Value_IntValue)(nil),
 		(*Value_TypeValue)(nil),
 	}
-	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[44].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[47].OneofWrappers = []interface{}{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_xyz_block_ftl_v1_schema_schema_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   45,
+			NumMessages:   48,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/backend/protos/xyz/block/ftl/v1/schema/schema.proto b/backend/protos/xyz/block/ftl/v1/schema/schema.proto
index 365d4eb7b4..bdc786070c 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.proto
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.proto
@@ -59,6 +59,8 @@ message Decl {
     Config config = 6;
     Secret secret = 7;
     FSM fsm = 8;
+    Topic topic = 9;
+    Subscription subscription = 10;
   }
 }
 
@@ -163,6 +165,7 @@ message Metadata {
     MetadataDatabases databases = 4;
     MetadataAlias alias = 5;
     MetadataRetry retry = 6;
+    MetadataSubscriber subscriber = 7;
   }
 }
 
@@ -201,6 +204,11 @@ message MetadataRetry {
   string maxBackoff = 4;
 }
 
+message MetadataSubscriber {
+  optional Position pos = 1;
+  string name = 2;
+}
+
 message Module {
   optional ModuleRuntime runtime = 31634;
 
@@ -250,10 +258,25 @@ message StringValue {
   string value = 2;
 }
 
+message Subscription {
+  optional Position pos = 1;
+  repeated string comments = 2;
+  string name = 3;
+  Ref topic = 4;
+}
+
 message Time {
   optional Position pos = 1;
 }
 
+message Topic {
+  optional Position pos = 1;
+  repeated string comments = 2;
+  bool export = 3;
+  string name = 4;
+  Type event = 5;
+}
+
 message Type {
   oneof value {
     Int int = 1;
diff --git a/backend/schema/data.go b/backend/schema/data.go
index caba52cde3..bd07e2ba91 100644
--- a/backend/schema/data.go
+++ b/backend/schema/data.go
@@ -123,7 +123,7 @@ func (d *Data) Monomorphise(ref *Ref) (*Data, error) {
 			*MetadataIngress, *MetadataCronJob, *MetadataAlias, *Module,
 			*Schema, *String, *Time, Type, *TypeParameter, *Unit, *Verb, *Enum,
 			*EnumVariant, Value, *IntValue, *StringValue, *TypeValue, Symbol,
-			Named, *FSM, *FSMTransition, *TypeAlias:
+			Named, *FSM, *FSMTransition, *TypeAlias, *Topic, *Subscription, *MetadataSubscriber:
 		}
 		return next()
 	})
diff --git a/backend/schema/jsonschema.go b/backend/schema/jsonschema.go
index 364a26186b..949809612a 100644
--- a/backend/schema/jsonschema.go
+++ b/backend/schema/jsonschema.go
@@ -49,7 +49,7 @@ func DataToJSONSchema(sch *Schema, ref Ref) (*jsonschema.Schema, error) {
 		case *Enum:
 			root.Definitions[r.String()] = jsonschema.SchemaOrBool{TypeObject: nodeToJSSchema(n, refs)}
 
-		case *Config, *Database, *Secret, *Verb, *FSM, *TypeAlias:
+		case *Config, *Database, *Secret, *Verb, *FSM, *TypeAlias, *Topic, *Subscription:
 			return nil, fmt.Errorf("reference to unsupported node type %T", decl)
 		}
 	}
@@ -187,7 +187,7 @@ func nodeToJSSchema(node Node, refs map[RefKey]*Ref) *jsonschema.Schema {
 		*MetadataAlias, IngressPathComponent, *IngressPathLiteral, *IngressPathParameter, *Module,
 		*Schema, Type, *Database, *Verb, *EnumVariant, *MetadataCronJob, Value,
 		*StringValue, *IntValue, *TypeValue, *Config, *Secret, Symbol, Named,
-		*FSM, *FSMTransition, *TypeAlias, *MetadataRetry:
+		*FSM, *FSMTransition, *TypeAlias, *MetadataRetry, *Topic, *Subscription, *MetadataSubscriber:
 		panic(fmt.Sprintf("unsupported node type %T", node))
 
 	default:
diff --git a/backend/schema/metadataretry.go b/backend/schema/metadataretry.go
index f4a8f483a3..02f9e8f97a 100644
--- a/backend/schema/metadataretry.go
+++ b/backend/schema/metadataretry.go
@@ -10,6 +10,7 @@ import (
 	"google.golang.org/protobuf/proto"
 
 	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"github.com/TBD54566975/ftl/internal/slices"
 )
 
 const (
@@ -145,26 +146,15 @@ func (m *MetadataRetry) RetryParams() (RetryParams, error) {
 // RetryParamsForFSMTransition finds the retry metadata for the given transition and returns the retry count, min and max backoff.
 func RetryParamsForFSMTransition(fsm *FSM, verb *Verb) (RetryParams, error) {
 	// Find retry metadata
-	var retryMetadata *MetadataRetry
-	for _, m := range verb.Metadata {
-		if m, ok := m.(*MetadataRetry); ok {
-			retryMetadata = m
-			break
-		}
-	}
-
-	if retryMetadata == nil {
+	retryMetadata, ok := slices.FindVariant[*MetadataRetry](verb.Metadata)
+	if !ok {
 		// default to fsm's retry metadata
-		for _, m := range fsm.Metadata {
-			if m, ok := m.(*MetadataRetry); ok {
-				retryMetadata = m
-				break
-			}
+		retryMetadata, ok = slices.FindVariant[*MetadataRetry](fsm.Metadata)
+		if !ok {
+			// no retry
+			return RetryParams{}, nil
 		}
 	}
 
-	if retryMetadata == nil {
-		return RetryParams{}, nil
-	}
 	return retryMetadata.RetryParams()
 }
diff --git a/backend/schema/metadatasubscription.go b/backend/schema/metadatasubscription.go
new file mode 100644
index 0000000000..4d448aef5b
--- /dev/null
+++ b/backend/schema/metadatasubscription.go
@@ -0,0 +1,30 @@
+package schema
+
+import (
+	"fmt"
+
+	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"google.golang.org/protobuf/proto"
+)
+
+type MetadataSubscriber struct {
+	Pos Position `parser:"" protobuf:"1,optional"`
+
+	Name string `parser:"'+' 'subscribe' @Ident" protobuf:"2"`
+}
+
+var _ Metadata = (*MetadataRetry)(nil)
+
+func (*MetadataSubscriber) schemaMetadata()          {}
+func (m *MetadataSubscriber) schemaChildren() []Node { return nil }
+func (m *MetadataSubscriber) Position() Position     { return m.Pos }
+func (m *MetadataSubscriber) String() string {
+	return fmt.Sprintf("+subscribe %v", m.Name)
+}
+
+func (m *MetadataSubscriber) ToProto() proto.Message {
+	return &schemapb.MetadataSubscriber{
+		Pos:  posToProto(m.Pos),
+		Name: m.Name,
+	}
+}
diff --git a/backend/schema/module.go b/backend/schema/module.go
index 347ce34f47..7693b99893 100644
--- a/backend/schema/module.go
+++ b/backend/schema/module.go
@@ -84,12 +84,14 @@ func (m *Module) String() string {
 
 	// print decls with spacing rules
 	typeSpacingRules := map[reflect.Type]spacingRule{
-		reflect.TypeOf(&Config{}):   {gapWithinType: false},
-		reflect.TypeOf(&Secret{}):   {gapWithinType: false, skipGapAfterTypes: []reflect.Type{reflect.TypeOf(&Config{})}},
-		reflect.TypeOf(&Database{}): {gapWithinType: false},
-		reflect.TypeOf(&Enum{}):     {gapWithinType: true},
-		reflect.TypeOf(&Data{}):     {gapWithinType: true},
-		reflect.TypeOf(&Verb{}):     {gapWithinType: true},
+		reflect.TypeOf(&Config{}):       {gapWithinType: false},
+		reflect.TypeOf(&Secret{}):       {gapWithinType: false, skipGapAfterTypes: []reflect.Type{reflect.TypeOf(&Config{})}},
+		reflect.TypeOf(&Database{}):     {gapWithinType: false},
+		reflect.TypeOf(&Topic{}):        {gapWithinType: false},
+		reflect.TypeOf(&Subscription{}): {gapWithinType: false, skipGapAfterTypes: []reflect.Type{reflect.TypeOf(&Topic{})}},
+		reflect.TypeOf(&Enum{}):         {gapWithinType: true},
+		reflect.TypeOf(&Data{}):         {gapWithinType: true},
+		reflect.TypeOf(&Verb{}):         {gapWithinType: true},
 	}
 
 	lastTypePrinted := optional.None[reflect.Type]()
@@ -100,8 +102,10 @@ func (m *Module) String() string {
 			rules = spacingRule{gapWithinType: true}
 		}
 		if lastType, ok := lastTypePrinted.Get(); ok {
-			if lastType == t && rules.gapWithinType {
-				fmt.Fprintln(w)
+			if lastType == t {
+				if rules.gapWithinType {
+					fmt.Fprintln(w)
+				}
 			} else if !slices.Contains(rules.skipGapAfterTypes, lastType) {
 				fmt.Fprintln(w)
 			}
diff --git a/backend/schema/parser.go b/backend/schema/parser.go
index 43a718ee12..9ef81f7241 100644
--- a/backend/schema/parser.go
+++ b/backend/schema/parser.go
@@ -12,7 +12,7 @@ import (
 )
 
 var (
-	declUnion            = []Decl{&Data{}, &Verb{}, &Database{}, &Enum{}, &TypeAlias{}, &Config{}, &Secret{}, &FSM{}}
+	declUnion            = []Decl{&Data{}, &Verb{}, &Database{}, &Enum{}, &TypeAlias{}, &Config{}, &Secret{}, &FSM{}, &Topic{}, &Subscription{}}
 	nonOptionalTypeUnion = []Type{
 		&Int{}, &Float{}, &String{}, &Bytes{}, &Bool{}, &Time{}, &Array{},
 		&Map{}, &Any{}, &Unit{},
@@ -21,7 +21,7 @@ var (
 		&Ref{},
 	}
 	typeUnion     = append(nonOptionalTypeUnion, &Optional{})
-	metadataUnion = []Metadata{&MetadataCalls{}, &MetadataIngress{}, &MetadataCronJob{}, &MetadataDatabases{}, &MetadataAlias{}, &MetadataRetry{}}
+	metadataUnion = []Metadata{&MetadataCalls{}, &MetadataIngress{}, &MetadataCronJob{}, &MetadataDatabases{}, &MetadataAlias{}, &MetadataRetry{}, &MetadataSubscriber{}}
 	ingressUnion  = []IngressPathComponent{&IngressPathLiteral{}, &IngressPathParameter{}}
 	valueUnion    = []Value{&StringValue{}, &IntValue{}, &TypeValue{}}
 
diff --git a/backend/schema/protobuf_dec.go b/backend/schema/protobuf_dec.go
index 04ed761fe3..eac216c617 100644
--- a/backend/schema/protobuf_dec.go
+++ b/backend/schema/protobuf_dec.go
@@ -37,6 +37,10 @@ func declListToSchema(s []*schemapb.Decl) []Decl {
 			out = append(out, SecretFromProto(n.Secret))
 		case *schemapb.Decl_Fsm:
 			out = append(out, FSMFromProto(n.Fsm))
+		case *schemapb.Decl_Topic:
+			out = append(out, TopicFromProto(n.Topic))
+		case *schemapb.Decl_Subscription:
+			out = append(out, SubscriptionFromProto(n.Subscription))
 		}
 	}
 	return out
@@ -149,6 +153,12 @@ func metadataToSchema(s *schemapb.Metadata) Metadata {
 			MaxBackoff: s.Retry.MaxBackoff,
 		}
 
+	case *schemapb.Metadata_Subscriber:
+		return &MetadataSubscriber{
+			Pos:  posFromProto(s.Subscriber.Pos),
+			Name: s.Subscriber.Name,
+		}
+
 	default:
 		panic(fmt.Sprintf("unhandled metadata type: %T", s))
 	}
diff --git a/backend/schema/protobuf_enc.go b/backend/schema/protobuf_enc.go
index 96aa072868..039ff088ef 100644
--- a/backend/schema/protobuf_enc.go
+++ b/backend/schema/protobuf_enc.go
@@ -49,6 +49,12 @@ func declListToProto(nodes []Decl) []*schemapb.Decl {
 
 		case *TypeAlias:
 			v = &schemapb.Decl_TypeAlias{TypeAlias: n.ToProto().(*schemapb.TypeAlias)}
+
+		case *Topic:
+			v = &schemapb.Decl_Topic{Topic: n.ToProto().(*schemapb.Topic)}
+
+		case *Subscription:
+			v = &schemapb.Decl_Subscription{Subscription: n.ToProto().(*schemapb.Subscription)}
 		}
 		out[i] = &schemapb.Decl{Value: v}
 	}
@@ -78,6 +84,9 @@ func metadataListToProto(nodes []Metadata) []*schemapb.Metadata {
 		case *MetadataRetry:
 			v = &schemapb.Metadata_Retry{Retry: n.ToProto().(*schemapb.MetadataRetry)}
 
+		case *MetadataSubscriber:
+			v = &schemapb.Metadata_Subscriber{Subscriber: n.ToProto().(*schemapb.MetadataSubscriber)}
+
 		default:
 			panic(fmt.Sprintf("unhandled metadata type %T", n))
 		}
diff --git a/backend/schema/schema_test.go b/backend/schema/schema_test.go
index 04ebe55d4e..8068765e3e 100644
--- a/backend/schema/schema_test.go
+++ b/backend/schema/schema_test.go
@@ -507,7 +507,157 @@ func TestParsing(t *testing.T) {
 				}},
 			},
 		},
+		{name: "PubSub",
+			input: `
+				module test {
+					export topic topicA test.eventA
+				
+					topic topicB test.eventB
+
+					subscription subA1 test.topicA
+
+					subscription subA2 test.topicA
+
+					subscription subB test.topicB
+
+					export data eventA {
+					}
+
+					data eventB {
+					}
+
+					verb consumesA(test.eventA) Unit
+						+subscribe subA1
+
+					verb consumesB1(test.eventB) Unit
+						+subscribe subB
+
+					verb consumesBothASubs(test.eventA) Unit
+						+subscribe subA1
+						+subscribe subA2
+				}
+			`,
+			expected: &Schema{
+				Modules: []*Module{{
+					Name: "test",
+					Decls: []Decl{
+						&Topic{
+							Export: true,
+							Name:   "topicA",
+							Event: &Ref{
+								Module: "test",
+								Name:   "eventA",
+							},
+						},
+						&Topic{
+							Name: "topicB",
+							Event: &Ref{
+								Module: "test",
+								Name:   "eventB",
+							},
+						},
+						&Subscription{
+							Name: "subA1",
+							Topic: &Ref{
+								Module: "test",
+								Name:   "topicA",
+							},
+						},
+						&Subscription{
+							Name: "subA2",
+							Topic: &Ref{
+								Module: "test",
+								Name:   "topicA",
+							},
+						},
+						&Subscription{
+							Name: "subB",
+							Topic: &Ref{
+								Module: "test",
+								Name:   "topicB",
+							},
+						},
+						&Data{
+							Export: true,
+							Name:   "eventA",
+						},
+						&Data{
+							Name: "eventB",
+						},
+						&Verb{
+							Name: "consumesA",
+							Request: &Ref{
+								Module: "test",
+								Name:   "eventA",
+							},
+							Response: &Unit{
+								Unit: true,
+							},
+							Metadata: []Metadata{
+								&MetadataSubscriber{
+									Name: "subA1",
+								},
+							},
+						},
+						&Verb{
+							Name: "consumesB1",
+							Request: &Ref{
+								Module: "test",
+								Name:   "eventB",
+							},
+							Response: &Unit{
+								Unit: true,
+							},
+							Metadata: []Metadata{
+								&MetadataSubscriber{
+									Name: "subB",
+								},
+							},
+						},
+						&Verb{
+							Name: "consumesBothASubs",
+							Request: &Ref{
+								Module: "test",
+								Name:   "eventA",
+							},
+							Response: &Unit{
+								Unit: true,
+							},
+							Metadata: []Metadata{
+								&MetadataSubscriber{
+									Name: "subA1",
+								},
+								&MetadataSubscriber{
+									Name: "subA2",
+								},
+							},
+						},
+					}},
+				},
+			},
+		},
+		{name: "PubSubErrors",
+			input: `
+				module test {
+					export topic topicA test.eventA
+
+					subscription subA test.topicB
+
+					export data eventA {
+					}
+
+					verb consumesB(test.eventB) Unit
+						+subscribe subB
+				}
+			`,
+			errors: []string{
+				`10:21-21: unknown reference "test.eventB", is the type annotated and exported?`,
+				`11:7-7: verb consumesB: could not find subscription "subB"`,
+				`5:24-24: unknown reference "test.topicB", is the type annotated and exported?`,
+			},
+		},
 	}
+
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
 			actual, err := ParseString("", test.input)
diff --git a/backend/schema/subscription.go b/backend/schema/subscription.go
new file mode 100644
index 0000000000..8a3de39c8b
--- /dev/null
+++ b/backend/schema/subscription.go
@@ -0,0 +1,58 @@
+package schema
+
+import (
+	"fmt"
+	"strings"
+
+	"google.golang.org/protobuf/proto"
+
+	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+)
+
+type Subscription struct {
+	Pos Position `parser:"" protobuf:"1,optional"`
+
+	Comments []string `parser:"@Comment*" protobuf:"2"`
+	Name     string   `parser:"'subscription' @Ident" protobuf:"3"`
+	Topic    *Ref     `parser:"@@" protobuf:"4"`
+}
+
+var _ Decl = (*Subscription)(nil)
+var _ Symbol = (*Subscription)(nil)
+
+func (s *Subscription) Position() Position { return s.Pos }
+func (*Subscription) schemaDecl()          {}
+func (*Subscription) schemaSymbol()        {}
+func (s *Subscription) schemaChildren() []Node {
+	return []Node{s.Topic}
+}
+
+func (s *Subscription) GetName() string  { return s.Name }
+func (s *Subscription) IsExported() bool { return false }
+
+func (s *Subscription) String() string {
+	w := &strings.Builder{}
+	fmt.Fprint(w, EncodeComments(s.Comments))
+	fmt.Fprintf(w, "subscription %s %v", s.Name, s.Topic)
+	return w.String()
+}
+
+func (s *Subscription) ToProto() proto.Message {
+	return &schemapb.Subscription{
+		Pos: posToProto(s.Pos),
+
+		Name:     s.Name,
+		Topic:    s.Topic.ToProto().(*schemapb.Ref), //nolint: forcetypeassert
+		Comments: s.Comments,
+	}
+}
+
+func SubscriptionFromProto(s *schemapb.Subscription) *Subscription {
+	return &Subscription{
+		Pos: posFromProto(s.Pos),
+
+		Name:     s.Name,
+		Topic:    RefFromProto(s.Topic),
+		Comments: s.Comments,
+	}
+}
diff --git a/backend/schema/topic.go b/backend/schema/topic.go
new file mode 100644
index 0000000000..58e39e01bc
--- /dev/null
+++ b/backend/schema/topic.go
@@ -0,0 +1,66 @@
+package schema
+
+import (
+	"fmt"
+	"strings"
+
+	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"google.golang.org/protobuf/proto"
+)
+
+type Topic struct {
+	Pos Position `parser:"" protobuf:"1,optional"`
+
+	Comments []string `parser:"@Comment*" protobuf:"2"`
+	Export   bool     `parser:"@'export'?" protobuf:"3"`
+	Name     string   `parser:"'topic' @Ident" protobuf:"4"`
+	Event    Type     `parser:"@@" protobuf:"5"`
+}
+
+var _ Decl = (*Topic)(nil)
+var _ Symbol = (*Topic)(nil)
+
+func (t *Topic) Position() Position { return t.Pos }
+func (*Topic) schemaDecl()          {}
+func (*Topic) schemaSymbol()        {}
+func (t *Topic) schemaChildren() []Node {
+	if t.Event == nil {
+		return nil
+	}
+	return []Node{t.Event}
+}
+
+func (t *Topic) GetName() string  { return t.Name }
+func (t *Topic) IsExported() bool { return t.Export }
+
+func (t *Topic) String() string {
+	w := &strings.Builder{}
+	fmt.Fprint(w, EncodeComments(t.Comments))
+	if t.Export {
+		fmt.Fprint(w, "export ")
+	}
+	fmt.Fprintf(w, "topic %s %s", t.Name, t.Event)
+	return w.String()
+}
+
+func (t *Topic) ToProto() proto.Message {
+	return &schemapb.Topic{
+		Pos: posToProto(t.Pos),
+
+		Name:     t.Name,
+		Export:   t.Export,
+		Event:    TypeToProto(t.Event),
+		Comments: t.Comments,
+	}
+}
+
+func TopicFromProto(t *schemapb.Topic) *Topic {
+	return &Topic{
+		Pos: posFromProto(t.Pos),
+
+		Name:     t.Name,
+		Export:   t.Export,
+		Event:    TypeFromProto(t.Event),
+		Comments: t.Comments,
+	}
+}
diff --git a/backend/schema/validate.go b/backend/schema/validate.go
index 8d34d6d6c3..eb18935709 100644
--- a/backend/schema/validate.go
+++ b/backend/schema/validate.go
@@ -8,6 +8,7 @@ import (
 	"slices"
 	"sort"
 	"strings"
+	"unicode"
 
 	"github.com/alecthomas/participle/v2"
 	"github.com/alecthomas/types/optional"
@@ -145,25 +146,30 @@ func ValidateModuleInSchema(schema *Schema, m optional.Option[*Module]) (*Schema
 
 			case *Verb:
 				for _, md := range n.Metadata {
-					md, ok := md.(*MetadataIngress)
-					if !ok {
-						continue
-					}
-					// Check for duplicate ingress keys
-					key := md.Method + " "
-					for _, path := range md.Path {
-						switch path := path.(type) {
-						case *IngressPathLiteral:
-							key += "/" + path.Text
-
-						case *IngressPathParameter:
-							key += "/{}"
+					switch md := md.(type) {
+					case *MetadataSubscriber:
+						subErrs := validateVerbSubscriptions(module, n, md, scopes, optional.Some(schema))
+						merr = append(merr, subErrs...)
+
+					case *MetadataIngress:
+						// Check for duplicate ingress keys
+						key := md.Method + " "
+						for _, path := range md.Path {
+							switch path := path.(type) {
+							case *IngressPathLiteral:
+								key += "/" + path.Text
+
+							case *IngressPathParameter:
+								key += "/{}"
+							}
 						}
+						if existing, ok := ingress[key]; ok {
+							merr = append(merr, errorf(md, "duplicate %s ingress %s for %s:%q and %s:%q", md.Type, key, existing.Pos, existing.Name, n.Pos, n.Name))
+						}
+						ingress[key] = n
+
+					case *MetadataCronJob, *MetadataRetry, *MetadataCalls, *MetadataDatabases, *MetadataAlias:
 					}
-					if existing, ok := ingress[key]; ok {
-						merr = append(merr, errorf(md, "duplicate %s ingress %s for %s:%q and %s:%q", md.Type, key, existing.Pos, existing.Name, n.Pos, n.Name))
-					}
-					ingress[key] = n
 				}
 
 			case *Enum:
@@ -217,7 +223,8 @@ func ValidateModuleInSchema(schema *Schema, m optional.Option[*Module]) (*Schema
 				*Int, *Map, Metadata, *MetadataCalls, *MetadataDatabases, *MetadataCronJob,
 				*MetadataIngress, *MetadataAlias, *Module, *Optional, *Schema, *TypeAlias,
 				*String, *Time, Type, *Unit, *Any, *TypeParameter, *EnumVariant, *MetadataRetry,
-				Value, *IntValue, *StringValue, *TypeValue, *Config, *Secret, Symbol, Named:
+				Value, *IntValue, *StringValue, *TypeValue, *Config, *Secret, Symbol, Named,
+				*MetadataSubscriber, *Subscription, *Topic:
 			}
 			return next()
 		})
@@ -332,12 +339,25 @@ func ValidateModule(module *Module) error {
 				}
 			}
 
+		case *Topic:
+			// Topic names must:
+			// - be idents: this allows us to generate external module files with the variable name as the topic name (with first letter uppercased, so it is visible to the module)
+			// - start with a lower case letter: this allows us to deterministically derive the topic name from the generated variable name
+			if !ValidateName(n.Name) || !unicode.IsLower(rune(n.Name[0])) {
+				merr = append(merr, errorf(n, "invalid name: must consist of only letters, numbers and underscores, and start with a lowercase letter."))
+			}
+
+		case *Subscription:
+			if !ValidateName(n.Name) {
+				merr = append(merr, errorf(n, "invalid name: must consist of only letters, numbers and underscores, and start with a letter."))
+			}
+
 		case *Array, *Bool, *Database, *Float, *Int,
 			*Time, *Map, *Module, *Schema, *String, *Bytes,
 			*MetadataCalls, *MetadataDatabases, *MetadataIngress, *MetadataCronJob, *MetadataAlias,
 			IngressPathComponent, *IngressPathLiteral, *IngressPathParameter, *Optional,
 			*Unit, *Any, *TypeParameter, *Enum, *EnumVariant, *IntValue, *StringValue, *TypeValue,
-			*FSM, *Config, *FSMTransition, *Secret, *TypeAlias, *MetadataRetry:
+			*FSM, *Config, *FSMTransition, *Secret, *TypeAlias, *MetadataRetry, *MetadataSubscriber:
 
 		case Named, Symbol, Type, Metadata, Value, Decl: // Union types.
 		}
@@ -369,16 +389,20 @@ func getDeclSortingPriority(decl Decl) int {
 		priority = 2
 	case *Database:
 		priority = 3
-	case *TypeAlias:
+	case *Topic:
 		priority = 4
-	case *Enum:
+	case *Subscription:
 		priority = 5
-	case *FSM:
+	case *TypeAlias:
 		priority = 6
-	case *Data:
+	case *Enum:
 		priority = 7
-	case *Verb:
+	case *FSM:
 		priority = 8
+	case *Data:
+		priority = 9
+	case *Verb:
+		priority = 10
 	}
 	return priority
 }
@@ -484,9 +508,11 @@ func validateVerbMetadata(scopes Scopes, module *Module, n *Verb) (merr []error)
 	metadataTypes := map[reflect.Type]bool{}
 	for _, md := range n.Metadata {
 		reflected := reflect.TypeOf(md)
-		if _, seen := metadataTypes[reflected]; seen {
-			merr = append(merr, errorf(md, "verb can not have multiple instances of %s", strings.ToLower(strings.TrimPrefix(reflected.String(), "*schema.Metadata"))))
-			continue
+		if _, allowsMultiple := md.(*MetadataSubscriber); !allowsMultiple {
+			if _, seen := metadataTypes[reflected]; seen {
+				merr = append(merr, errorf(md, "verb can not have multiple instances of %s", strings.ToLower(strings.TrimPrefix(reflected.String(), "*schema.Metadata"))))
+				continue
+			}
 		}
 		metadataTypes[reflected] = true
 
@@ -559,6 +585,9 @@ func validateVerbMetadata(scopes Scopes, module *Module, n *Verb) (merr []error)
 			if retryParams.MaxBackoff < retryParams.MinBackoff {
 				merr = append(merr, errorf(md, "verb %s: max backoff duration (%s) needs to be atleast as long as initial backoff (%s)", n.Name, md.MaxBackoff, md.MinBackoff))
 			}
+		case *MetadataSubscriber:
+			subErrs := validateVerbSubscriptions(module, n, md, scopes, optional.None[*Schema]())
+			merr = append(merr, subErrs...)
 		case *MetadataCalls, *MetadataDatabases, *MetadataAlias:
 		}
 	}
@@ -611,6 +640,44 @@ func validateIngressRequestOrResponse(scopes Scopes, module *Module, n *Verb, re
 	return
 }
 
+func validateVerbSubscriptions(module *Module, v *Verb, md *MetadataSubscriber, scopes Scopes, schema optional.Option[*Schema]) (merr []error) {
+	merr = []error{}
+	var subscription *Subscription
+	for _, decl := range module.Decls {
+		if sub, ok := decl.(*Subscription); ok && sub.Name == md.Name {
+			subscription = sub
+			break
+		}
+	}
+	if subscription == nil {
+		merr = append(merr, errorf(md, "verb %s: could not find subscription %q", v.Name, md.Name))
+		return
+	}
+
+	topicDecl := scopes.Resolve(*subscription.Topic)
+	if topicDecl == nil {
+		if subscription.Topic.Module != "" && subscription.Topic.Module != module.Name && !schema.Ok() {
+			// can not validate subscriptions from external modules until we have the whole schema
+			return
+		}
+		merr = append(merr, errorf(md, "verb %s: could not resolve topic %q for subscription %q", v.Name, subscription.Topic, md.Name))
+		return
+	}
+	topic, ok := topicDecl.Symbol.(*Topic)
+	if !ok {
+		merr = append(merr, errorf(md, "verb %s: expected topic but found %T for %q", v.Name, topicDecl, subscription.Topic))
+		return
+	}
+
+	if !v.Request.Equal(topic.Event) {
+		merr = append(merr, errorf(md, "verb %s: request type %v differs from subscription's event type %v", v.Name, v.Request, topic.Event))
+	}
+	if _, ok := v.Response.(*Unit); !ok {
+		merr = append(merr, errorf(md, "verb %s: must be a sink to subscribe but found response type %v", v.Name, v.Response))
+	}
+	return merr
+}
+
 // Give a type a human-readable name.
 func typeName(v any) string {
 	return strings.ToLower(reflect.Indirect(reflect.ValueOf(v)).Type().Name())
diff --git a/backend/schema/validate_test.go b/backend/schema/validate_test.go
index c7e9ca2a55..a39cd92717 100644
--- a/backend/schema/validate_test.go
+++ b/backend/schema/validate_test.go
@@ -379,6 +379,43 @@ func TestValidate(t *testing.T) {
 				`4:19: unexpected token "s"`,
 			},
 		},
+		{name: "InvalidPubSub",
+			schema: `
+			module test {
+				export topic topicA test.eventA
+			
+				topic topicB test.eventB
+
+				topic StartsWithUpperCase test.eventA
+
+				subscription subA test.topicA
+
+				subscription subB test.topicB
+
+				export data eventA {
+				}
+
+				data eventB {
+				}
+
+				verb wrongEventType(test.eventA) Unit
+					+subscribe subB
+
+				verb SourceCantSubscribe(Unit) test.eventB
+					+subscribe subB
+
+				verb EmptyCantSubscribe(Unit) Unit
+					+subscribe subB
+			}
+			`,
+			errs: []string{
+				`20:6-6: verb wrongEventType: request type test.eventA differs from subscription's event type test.eventB`,
+				`23:6-6: verb SourceCantSubscribe: must be a sink to subscribe but found response type test.eventB`,
+				`23:6-6: verb SourceCantSubscribe: request type Unit differs from subscription's event type test.eventB`,
+				`26:6-6: verb EmptyCantSubscribe: request type Unit differs from subscription's event type test.eventB`,
+				`7:5-5: invalid name: must consist of only letters, numbers and underscores, and start with a lowercase letter.`,
+			},
+		},
 	}
 
 	for _, test := range tests {
diff --git a/backend/schema/verb.go b/backend/schema/verb.go
index 46de334ab4..36edb8afd4 100644
--- a/backend/schema/verb.go
+++ b/backend/schema/verb.go
@@ -8,6 +8,7 @@ import (
 	"google.golang.org/protobuf/proto"
 
 	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"github.com/TBD54566975/ftl/internal/slices"
 )
 
 type Verb struct {
@@ -86,29 +87,23 @@ func (v *Verb) String() string {
 
 // AddCall adds a call reference to the Verb.
 func (v *Verb) AddCall(verb *Ref) {
-	for _, c := range v.Metadata {
-		if c, ok := c.(*MetadataCalls); ok {
-			c.Calls = append(c.Calls, verb)
-			return
-		}
+	if c, ok := slices.FindVariant[*MetadataCalls](v.Metadata); ok {
+		c.Calls = append(c.Calls, verb)
+		return
 	}
 	v.Metadata = append(v.Metadata, &MetadataCalls{Calls: []*Ref{verb}})
 }
 
 func (v *Verb) GetMetadataIngress() optional.Option[*MetadataIngress] {
-	for _, m := range v.Metadata {
-		if m, ok := m.(*MetadataIngress); ok {
-			return optional.Some(m)
-		}
+	if m, ok := slices.FindVariant[*MetadataIngress](v.Metadata); ok {
+		return optional.Some(m)
 	}
 	return optional.None[*MetadataIngress]()
 }
 
 func (v *Verb) GetMetadataCronJob() optional.Option[*MetadataCronJob] {
-	for _, m := range v.Metadata {
-		if m, ok := m.(*MetadataCronJob); ok {
-			return optional.Some(m)
-		}
+	if m, ok := slices.FindVariant[*MetadataCronJob](v.Metadata); ok {
+		return optional.Some(m)
 	}
 	return optional.None[*MetadataCronJob]()
 }
diff --git a/frontend/src/protos/xyz/block/ftl/v1/schema/schema_pb.ts b/frontend/src/protos/xyz/block/ftl/v1/schema/schema_pb.ts
index e641c70a47..4312417878 100644
--- a/frontend/src/protos/xyz/block/ftl/v1/schema/schema_pb.ts
+++ b/frontend/src/protos/xyz/block/ftl/v1/schema/schema_pb.ts
@@ -401,6 +401,18 @@ export class Decl extends Message<Decl> {
      */
     value: FSM;
     case: "fsm";
+  } | {
+    /**
+     * @generated from field: xyz.block.ftl.v1.schema.Topic topic = 9;
+     */
+    value: Topic;
+    case: "topic";
+  } | {
+    /**
+     * @generated from field: xyz.block.ftl.v1.schema.Subscription subscription = 10;
+     */
+    value: Subscription;
+    case: "subscription";
   } | { case: undefined; value?: undefined } = { case: undefined };
 
   constructor(data?: PartialMessage<Decl>) {
@@ -419,6 +431,8 @@ export class Decl extends Message<Decl> {
     { no: 6, name: "config", kind: "message", T: Config, oneof: "value" },
     { no: 7, name: "secret", kind: "message", T: Secret, oneof: "value" },
     { no: 8, name: "fsm", kind: "message", T: FSM, oneof: "value" },
+    { no: 9, name: "topic", kind: "message", T: Topic, oneof: "value" },
+    { no: 10, name: "subscription", kind: "message", T: Subscription, oneof: "value" },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Decl {
@@ -1206,6 +1220,12 @@ export class Metadata extends Message<Metadata> {
      */
     value: MetadataRetry;
     case: "retry";
+  } | {
+    /**
+     * @generated from field: xyz.block.ftl.v1.schema.MetadataSubscriber subscriber = 7;
+     */
+    value: MetadataSubscriber;
+    case: "subscriber";
   } | { case: undefined; value?: undefined } = { case: undefined };
 
   constructor(data?: PartialMessage<Metadata>) {
@@ -1222,6 +1242,7 @@ export class Metadata extends Message<Metadata> {
     { no: 4, name: "databases", kind: "message", T: MetadataDatabases, oneof: "value" },
     { no: 5, name: "alias", kind: "message", T: MetadataAlias, oneof: "value" },
     { no: 6, name: "retry", kind: "message", T: MetadataRetry, oneof: "value" },
+    { no: 7, name: "subscriber", kind: "message", T: MetadataSubscriber, oneof: "value" },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Metadata {
@@ -1529,6 +1550,49 @@ export class MetadataRetry extends Message<MetadataRetry> {
   }
 }
 
+/**
+ * @generated from message xyz.block.ftl.v1.schema.MetadataSubscriber
+ */
+export class MetadataSubscriber extends Message<MetadataSubscriber> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: string name = 2;
+   */
+  name = "";
+
+  constructor(data?: PartialMessage<MetadataSubscriber>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "xyz.block.ftl.v1.schema.MetadataSubscriber";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "name", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): MetadataSubscriber {
+    return new MetadataSubscriber().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): MetadataSubscriber {
+    return new MetadataSubscriber().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): MetadataSubscriber {
+    return new MetadataSubscriber().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: MetadataSubscriber | PlainMessage<MetadataSubscriber> | undefined, b: MetadataSubscriber | PlainMessage<MetadataSubscriber> | undefined): boolean {
+    return proto3.util.equals(MetadataSubscriber, a, b);
+  }
+}
+
 /**
  * @generated from message xyz.block.ftl.v1.schema.Module
  */
@@ -1921,6 +1985,61 @@ export class StringValue extends Message<StringValue> {
   }
 }
 
+/**
+ * @generated from message xyz.block.ftl.v1.schema.Subscription
+ */
+export class Subscription extends Message<Subscription> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: repeated string comments = 2;
+   */
+  comments: string[] = [];
+
+  /**
+   * @generated from field: string name = 3;
+   */
+  name = "";
+
+  /**
+   * @generated from field: xyz.block.ftl.v1.schema.Ref topic = 4;
+   */
+  topic?: Ref;
+
+  constructor(data?: PartialMessage<Subscription>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "xyz.block.ftl.v1.schema.Subscription";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "comments", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 3, name: "name", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 4, name: "topic", kind: "message", T: Ref },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Subscription {
+    return new Subscription().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): Subscription {
+    return new Subscription().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): Subscription {
+    return new Subscription().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: Subscription | PlainMessage<Subscription> | undefined, b: Subscription | PlainMessage<Subscription> | undefined): boolean {
+    return proto3.util.equals(Subscription, a, b);
+  }
+}
+
 /**
  * @generated from message xyz.block.ftl.v1.schema.Time
  */
@@ -1958,6 +2077,67 @@ export class Time extends Message<Time> {
   }
 }
 
+/**
+ * @generated from message xyz.block.ftl.v1.schema.Topic
+ */
+export class Topic extends Message<Topic> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: repeated string comments = 2;
+   */
+  comments: string[] = [];
+
+  /**
+   * @generated from field: bool export = 3;
+   */
+  export = false;
+
+  /**
+   * @generated from field: string name = 4;
+   */
+  name = "";
+
+  /**
+   * @generated from field: xyz.block.ftl.v1.schema.Type event = 5;
+   */
+  event?: Type;
+
+  constructor(data?: PartialMessage<Topic>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "xyz.block.ftl.v1.schema.Topic";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "comments", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 3, name: "export", kind: "scalar", T: 8 /* ScalarType.BOOL */ },
+    { no: 4, name: "name", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 5, name: "event", kind: "message", T: Type },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Topic {
+    return new Topic().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): Topic {
+    return new Topic().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): Topic {
+    return new Topic().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: Topic | PlainMessage<Topic> | undefined, b: Topic | PlainMessage<Topic> | undefined): boolean {
+    return proto3.util.equals(Topic, a, b);
+  }
+}
+
 /**
  * @generated from message xyz.block.ftl.v1.schema.Type
  */
diff --git a/go-runtime/compile/build.go b/go-runtime/compile/build.go
index f1a1193ac8..572faddd29 100644
--- a/go-runtime/compile/build.go
+++ b/go-runtime/compile/build.go
@@ -167,21 +167,23 @@ func Build(ctx context.Context, moduleDir string, sch *schema.Schema, filesTrans
 	logger.Debugf("Generating main module")
 	goVerbs := make([]goVerb, 0, len(main.Decls))
 	for _, decl := range main.Decls {
-		if verb, ok := decl.(*schema.Verb); ok {
-			nativeName, ok := pr.NativeNames[verb]
-			if !ok {
-				return fmt.Errorf("missing native name for verb %s", verb.Name)
-			}
+		verb, ok := decl.(*schema.Verb)
+		if !ok {
+			continue
+		}
+		nativeName, ok := pr.NativeNames[verb]
+		if !ok {
+			return fmt.Errorf("missing native name for verb %s", verb.Name)
+		}
 
-			goverb := goVerb{Name: nativeName}
-			if _, ok := verb.Request.(*schema.Unit); !ok {
-				goverb.HasRequest = true
-			}
-			if _, ok := verb.Response.(*schema.Unit); !ok {
-				goverb.HasResponse = true
-			}
-			goVerbs = append(goVerbs, goverb)
+		goverb := goVerb{Name: nativeName}
+		if _, ok := verb.Request.(*schema.Unit); !ok {
+			goverb.HasRequest = true
 		}
+		if _, ok := verb.Response.(*schema.Unit); !ok {
+			goverb.HasResponse = true
+		}
+		goVerbs = append(goVerbs, goverb)
 	}
 	if err := internal.ScaffoldZip(buildTemplateFiles(), moduleDir, mainModuleContext{
 		GoVersion:    goModVersion,
@@ -209,8 +211,8 @@ func Build(ctx context.Context, moduleDir string, sch *schema.Schema, filesTrans
 		}
 		return filesTransaction.ModifiedFiles(filepath.Join(mainDir, "go.mod"), filepath.Join(moduleDir, "go.sum"))
 	})
+	modulesDir := filepath.Join(buildDir, "go", "modules")
 	wg.Go(func() error {
-		modulesDir := filepath.Join(buildDir, "go", "modules")
 		if err := exec.Command(wgctx, log.Debug, modulesDir, "go", "mod", "tidy").RunBuffered(wgctx); err != nil {
 			return fmt.Errorf("%s: failed to tidy go.mod: %w", modulesDir, err)
 		}
@@ -378,6 +380,15 @@ var scaffoldFuncs = scaffolder.FuncMap{
 		}
 		return out
 	},
+	"needsFTLImport": func(m *schema.Module) bool {
+		for _, d := range m.Decls {
+			if topic, ok := d.(*schema.Topic); ok && topic.IsExported() {
+				// uses ftl.RegisterTopic(...) function calls
+				return true
+			}
+		}
+		return false
+	},
 }
 
 func schemaType(t schema.Type) string {
diff --git a/go-runtime/compile/external-module-template/_ftl/go/modules/{{ range .NonMainModules }}{{ push .Name . }}{{ end }}/external_module.go b/go-runtime/compile/external-module-template/_ftl/go/modules/{{ range .NonMainModules }}{{ push .Name . }}{{ end }}/external_module.go
index aa7b3dc57b..c425b41444 100644
--- a/go-runtime/compile/external-module-template/_ftl/go/modules/{{ range .NonMainModules }}{{ push .Name . }}{{ end }}/external_module.go	
+++ b/go-runtime/compile/external-module-template/_ftl/go/modules/{{ range .NonMainModules }}{{ push .Name . }}{{ end }}/external_module.go	
@@ -12,6 +12,10 @@ import (
 
   "github.com/TBD54566975/ftl/go-runtime/ftl/reflection"
 {{- end}}
+{{- if $ | needsFTLImport }}
+
+  "github.com/TBD54566975/ftl/go-runtime/ftl"
+{{- end}}
 )
 
 var _ = context.Background
@@ -22,7 +26,9 @@ var _ = context.Background
 //
 {{- end}}
 {{- if .IsExported}}
-{{- if and (is "Enum" .) .IsValueEnum}}
+{{- if is "Topic" .}}
+var {{.Name|title}} = ftl.RegisterTopic[{{type $ .Event}}]("{{.Name}}")
+{{- else if and (is "Enum" .) .IsValueEnum}}
 {{- $enumName := .Name}}
 //ftl:enum
 type {{.Name|title}} {{type $ .Type}}
diff --git a/go-runtime/compile/parser.go b/go-runtime/compile/parser.go
index 14c892d41f..c0ff4fa6c0 100644
--- a/go-runtime/compile/parser.go
+++ b/go-runtime/compile/parser.go
@@ -153,13 +153,39 @@ func (d *directiveRetry) String() string {
 	return strings.Join(components, " ")
 }
 
+// used to subscribe a sink to a subscription
+type directiveSubscriber struct {
+	Pos schema.Position
+
+	Name string `parser:"'subscribe' @Ident"`
+}
+
+func (*directiveSubscriber) directive() {}
+
+func (d *directiveSubscriber) String() string {
+	return fmt.Sprintf("subscribe %s", d.Name)
+}
+
+// most declarations include export in other directives, but some don't have any other way.
+type directiveExport struct {
+	Pos schema.Position
+
+	Export bool `parser:"@'export'"`
+}
+
+func (*directiveExport) directive() {}
+
+func (d *directiveExport) String() string {
+	return "export"
+}
+
 var directiveParser = participle.MustBuild[directiveWrapper](
 	participle.Lexer(schema.Lexer),
 	participle.Elide("Whitespace"),
 	participle.Unquote(),
 	participle.UseLookahead(2),
 	participle.Union[directive](&directiveVerb{}, &directiveData{}, &directiveEnum{}, &directiveTypeAlias{},
-		&directiveIngress{}, &directiveCronJob{}, &directiveRetry{}),
+		&directiveIngress{}, &directiveCronJob{}, &directiveRetry{}, &directiveSubscriber{}, &directiveExport{}),
 	participle.Union[schema.IngressPathComponent](&schema.IngressPathLiteral{}, &schema.IngressPathParameter{}),
 )
 
diff --git a/go-runtime/compile/schema.go b/go-runtime/compile/schema.go
index e6fbf78eb6..72d284dfbe 100644
--- a/go-runtime/compile/schema.go
+++ b/go-runtime/compile/schema.go
@@ -34,16 +34,18 @@ var (
 		return mustLoadRef("builtin", "error").Type().Underlying().(*types.Interface) //nolint:forcetypeassert
 	})
 
-	ftlCallFuncPath       = "github.com/TBD54566975/ftl/go-runtime/ftl.Call"
-	ftlFSMFuncPath        = "github.com/TBD54566975/ftl/go-runtime/ftl.FSM"
-	ftlTransitionFuncPath = "github.com/TBD54566975/ftl/go-runtime/ftl.Transition"
-	ftlStartFuncPath      = "github.com/TBD54566975/ftl/go-runtime/ftl.Start"
-	ftlConfigFuncPath     = "github.com/TBD54566975/ftl/go-runtime/ftl.Config"
-	ftlSecretFuncPath     = "github.com/TBD54566975/ftl/go-runtime/ftl.Secret" //nolint:gosec
-	ftlPostgresDBFuncPath = "github.com/TBD54566975/ftl/go-runtime/ftl.PostgresDatabase"
-	ftlUnitTypePath       = "github.com/TBD54566975/ftl/go-runtime/ftl.Unit"
-	ftlOptionTypePath     = "github.com/TBD54566975/ftl/go-runtime/ftl.Option"
-	aliasFieldTag         = "json"
+	ftlCallFuncPath         = "github.com/TBD54566975/ftl/go-runtime/ftl.Call"
+	ftlFSMFuncPath          = "github.com/TBD54566975/ftl/go-runtime/ftl.FSM"
+	ftlTransitionFuncPath   = "github.com/TBD54566975/ftl/go-runtime/ftl.Transition"
+	ftlStartFuncPath        = "github.com/TBD54566975/ftl/go-runtime/ftl.Start"
+	ftlConfigFuncPath       = "github.com/TBD54566975/ftl/go-runtime/ftl.Config"
+	ftlSecretFuncPath       = "github.com/TBD54566975/ftl/go-runtime/ftl.Secret" //nolint:gosec
+	ftlPostgresDBFuncPath   = "github.com/TBD54566975/ftl/go-runtime/ftl.PostgresDatabase"
+	ftlUnitTypePath         = "github.com/TBD54566975/ftl/go-runtime/ftl.Unit"
+	ftlOptionTypePath       = "github.com/TBD54566975/ftl/go-runtime/ftl.Option"
+	ftlTopicFuncPath        = "github.com/TBD54566975/ftl/go-runtime/ftl.RegisterTopic"
+	ftlSubscriptionFuncPath = "github.com/TBD54566975/ftl/go-runtime/ftl.RegisterSubscription"
+	aliasFieldTag           = "json"
 )
 
 // NativeNames is a map of top-level declarations to their native Go names.
@@ -79,6 +81,7 @@ func tokenWrapf(pos token.Pos, tokenText string, err error, format string, args
 	return schema.Wrapf(goPos, endColumn, err, format, args...)
 }
 
+//nolint:unparam
 func wrapf(node ast.Node, err error, format string, args ...interface{}) *schema.Error {
 	pos, endCol := goNodePosToSchemaPos(node)
 	return schema.Wrapf(pos, endCol, err, format, args...)
@@ -138,7 +141,7 @@ func ExtractModuleSchema(dir string, sch *schema.Schema) (optional.Option[ParseR
 			}
 		}
 		pctx := newParseContext(pkg, pkgs, module, sch)
-		err := extractTypeDecls(pctx)
+		err := extractInitialDecls(pctx)
 		if err != nil {
 			return optional.None[ParseResult](), err
 		}
@@ -186,20 +189,31 @@ func ExtractModuleSchema(dir string, sch *schema.Schema) (optional.Option[ParseR
 	}), schema.ValidateModule(module)
 }
 
-// extractTypeDecls traverses the package's AST and extracts type declarations (type aliases and enums)
+// extractInitialDecls traverses the package's AST and extracts declarations needed up front (type aliases, enums and topics)
 //
 // This allows us to know if a type is a type alias or an enum regardless of ordering when visiting each ast node.
 // - The Decls get added to the pctx's module, nativeNames and enumInterfaces.
 // - We only want to do a simple pass, so we do not resolve references to other types. This means the TypeAlias and Enum decls have Type = nil
 //   - This get's filled in with the next pass
-func extractTypeDecls(pctx *parseContext) error {
+//
+// It also helps with topics because we need to know the stack when visiting a topic decl, but the subscription may occur first.
+// In this case there is no way for the subscription to make the topic exported.
+func extractInitialDecls(pctx *parseContext) error {
 	for _, file := range pctx.pkg.Syntax {
 		err := goast.Visit(file, func(stack []ast.Node, next func() error) (err error) {
-			node, ok := (stack[len(stack)-1]).(*ast.GenDecl)
-			if !ok || node.Tok != token.TYPE {
-				return next()
+			switch node := stack[len(stack)-1].(type) {
+			case *ast.GenDecl:
+				if node.Tok == token.TYPE {
+					extractTypeDecl(pctx, node)
+				}
+
+			case *ast.CallExpr:
+				_, fn := deref[*types.Func](pctx.pkg, node.Fun)
+				if fn != nil && fn.FullName() == ftlTopicFuncPath {
+					extractTopicDecl(pctx, node, stack)
+				}
 			}
-			extractTypeDeclsForNode(pctx, node)
+
 			return next()
 		})
 		if err != nil {
@@ -209,7 +223,7 @@ func extractTypeDecls(pctx *parseContext) error {
 	return nil
 }
 
-func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
+func extractTypeDecl(pctx *parseContext, node *ast.GenDecl) {
 	directives, parseErr := parseDirectives(node, fset, node.Doc)
 	if parseErr != nil {
 		// errors collected when visiting all nodes in the next pass
@@ -239,7 +253,7 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 					Pos:      goPosToSchemaPos(node.Pos()),
 					Comments: parseComments(node.Doc),
 					Name:     strcase.ToUpperCamel(t.Name.Name),
-					Type:     nil, //TODO: explain
+					Type:     nil, // nil until next pass, when we can visit the full type graph
 					Export:   dir.IsExported(),
 				}
 				pctx.module.Decls = append(pctx.module.Decls, enum)
@@ -283,12 +297,12 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 				Comments: parseComments(node.Doc),
 				Name:     strcase.ToUpperCamel(t.Name.Name),
 				Export:   dir.IsExported(),
-				Type:     nil, //TODO: explain
+				Type:     nil, // nil until next pass, when we can visit the full type graph
 			}
 			pctx.module.Decls = append(pctx.module.Decls, alias)
 			pctx.nativeNames[alias] = nativeName
 			foundDeclType = optional.Some("type alias")
-		case *directiveData, *directiveIngress, *directiveVerb, *directiveCronJob, *directiveRetry:
+		case *directiveData, *directiveIngress, *directiveVerb, *directiveCronJob, *directiveRetry, *directiveExport, *directiveSubscriber:
 			continue
 		}
 		if foundDeclType, ok := foundDeclType.Get(); ok {
@@ -300,6 +314,63 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 	}
 }
 
+func extractStringLiteralArg(node *ast.CallExpr, argIndex int) (string, *schema.Error) {
+	if argIndex >= len(node.Args) {
+		return "", errorf(node, "expected string argument at index %d", argIndex)
+	}
+
+	literal, ok := node.Args[argIndex].(*ast.BasicLit)
+	if !ok || literal.Kind != token.STRING {
+		return "", errorf(node, "expected string literal for argument at index %d", argIndex)
+	}
+
+	s, err := strconv.Unquote(literal.Value)
+	if err != nil {
+		return "", wrapf(node, err, "")
+	}
+	if s == "" {
+		return "", errorf(node, "expected non-empty string literal for argument at index %d", argIndex)
+	}
+	return s, nil
+}
+
+// extractTopicDecl expects: _ = ftl.RegisterTopic[EventType]("name_literal")
+func extractTopicDecl(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
+	name, nameErr := extractStringLiteralArg(node, 0)
+	if nameErr != nil {
+		pctx.errors.add(nameErr)
+		return
+	}
+
+	comments, directives := parseCommentsAndDirectivesForCall(pctx, stack)
+	export := false
+	for _, dir := range directives {
+		if _, ok := dir.(*directiveExport); ok {
+			export = true
+		} else {
+			pctx.errors.add(errorf(node, "unexpected directive attached for topic: %T", dir))
+		}
+	}
+
+	// Check for duplicates
+	_, endCol := goNodePosToSchemaPos(node)
+	for _, d := range pctx.module.Decls {
+		existing, ok := d.(*schema.Topic)
+		if ok && existing.Name == name {
+			pctx.errors.add(errorf(node, "duplicate topic registration at %d:%d-%d", existing.Pos.Line, existing.Pos.Column, endCol))
+			return
+		}
+	}
+
+	pctx.module.Decls = append(pctx.module.Decls, &schema.Topic{
+		Pos:      goPosToSchemaPos(node.Pos()),
+		Name:     name,
+		Export:   export,
+		Comments: comments,
+		Event:    nil, // event is nil until we the next pass, when we can visit the full graph
+	})
+}
+
 func visitCallExpr(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
 	_, fn := deref[*types.Func](pctx.pkg, node.Fun)
 	if fn == nil {
@@ -318,6 +389,12 @@ func visitCallExpr(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
 
 	case ftlPostgresDBFuncPath:
 		parseDatabaseDecl(pctx, node, schema.PostgresDatabaseType)
+
+	case ftlTopicFuncPath:
+		parseTopicDecl(pctx, node)
+
+	case ftlSubscriptionFuncPath:
+		parseSubscriptionDecl(pctx, node)
 	}
 }
 
@@ -398,20 +475,11 @@ func parseVerbRef(pctx *parseContext, node ast.Expr) *schema.Ref {
 }
 
 func parseFSMDecl(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
-	var literal *ast.BasicLit
-	if len(node.Args) > 0 {
-		literal, _ = node.Args[0].(*ast.BasicLit)
-	}
-	if literal == nil || literal.Kind != token.STRING {
-		pctx.errors.add(errorf(node, "first argument to an FSM declaration must be the name as a string literal"))
+	name, schemaErr := extractStringLiteralArg(node, 0)
+	if schemaErr != nil {
+		pctx.errors.add(schemaErr)
 		return
 	}
-
-	name, err := strconv.Unquote(literal.Value)
-	if err != nil {
-		panic(err) // Should never happen
-	}
-
 	if !schema.ValidateName(name) {
 		pctx.errors.add(errorf(node, "FSM names must be valid identifiers"))
 	}
@@ -437,21 +505,7 @@ func parseFSMDecl(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
 		parseFSMTransition(pctx, call, fn, fsm)
 	}
 
-	// find variable declaration that we are currently in so we can look for attached directives
-	var variableDecl *ast.GenDecl
-	for i := len(stack) - 1; i >= 0; i-- {
-		if decl, ok := stack[i].(*ast.GenDecl); ok && decl.Tok == token.VAR {
-			variableDecl = decl
-			break
-		}
-	}
-	if variableDecl == nil || variableDecl.Doc == nil {
-		return
-	}
-	directives, schemaErr := parseDirectives(node, fset, variableDecl.Doc)
-	if schemaErr != nil {
-		pctx.errors.add(schemaErr)
-	}
+	_, directives := parseCommentsAndDirectivesForCall(pctx, stack)
 	for _, dir := range directives {
 		if retryDir, ok := dir.(*directiveRetry); ok {
 			fsm.Metadata = append(fsm.Metadata, &schema.MetadataRetry{
@@ -502,19 +556,11 @@ func parseFSMTransition(pctx *parseContext, node *ast.CallExpr, fn *types.Func,
 }
 
 func parseConfigDecl(pctx *parseContext, node *ast.CallExpr, fn *types.Func) {
-	var literal *ast.BasicLit
-	if len(node.Args) > 0 {
-		literal, _ = node.Args[0].(*ast.BasicLit)
-	}
-	if literal == nil || literal.Kind != token.STRING {
-		pctx.errors.add(errorf(node, "first argument to config and secret declarations must be the name as a string literal"))
+	name, schemaErr := extractStringLiteralArg(node, 0)
+	if schemaErr != nil {
+		pctx.errors.add(schemaErr)
 		return
 	}
-	name, err := strconv.Unquote(literal.Value)
-	if err != nil {
-		panic(err) // Should never happen
-	}
-
 	if !schema.ValidateName(name) {
 		pctx.errors.add(errorf(node, "config and secret names must be valid identifiers"))
 	}
@@ -569,19 +615,9 @@ func parseConfigDecl(pctx *parseContext, node *ast.CallExpr, fn *types.Func) {
 }
 
 func parseDatabaseDecl(pctx *parseContext, node *ast.CallExpr, dbType string) {
-	var name string
-	if len(node.Args) == 1 {
-		if literal, ok := node.Args[0].(*ast.BasicLit); ok && literal.Kind == token.STRING {
-			var err error
-			name, err = strconv.Unquote(literal.Value)
-			if err != nil {
-				pctx.errors.add(wrapf(node, err, ""))
-				return
-			}
-		}
-	}
-	if name == "" {
-		pctx.errors.add(errorf(node, "config and secret declarations must have a single string literal argument"))
+	name, schemaErr := extractStringLiteralArg(node, 0)
+	if schemaErr != nil {
+		pctx.errors.add(schemaErr)
 		return
 	}
 
@@ -603,6 +639,134 @@ func parseDatabaseDecl(pctx *parseContext, node *ast.CallExpr, dbType string) {
 	pctx.module.Decls = append(pctx.module.Decls, decl)
 }
 
+// parseTopicDecl expects: _ = ftl.RegisterTopic[EventType]("name_literal")
+func parseTopicDecl(pctx *parseContext, node *ast.CallExpr) {
+	// already extracted topic in the initial pass of the ast graph
+	// we did not do event type resolution yet, so we need to do that now
+	name, nameErr := extractStringLiteralArg(node, 0)
+	if nameErr != nil {
+		// error already added in previous pass
+		return
+	}
+
+	var topic *schema.Topic
+	for _, d := range pctx.module.Decls {
+		if d, ok := d.(*schema.Topic); ok && d.Name == name {
+			topic = d
+		}
+	}
+
+	// update topic's event type
+	indexExpr, ok := node.Fun.(*ast.IndexExpr)
+	if !ok {
+		pctx.errors.add(errorf(node, "must have an event type as a type parameter"))
+		return
+	}
+	typeParamType, ok := visitType(pctx, node.Pos(), pctx.pkg.TypesInfo.TypeOf(indexExpr.Index), topic.Export).Get()
+	if !ok {
+		pctx.errors.add(errorf(node, "invalid event type"))
+		return
+	}
+	topic.Event = typeParamType
+}
+
+// parseSubscriptionDecl expects: var _ = ftl.RegisterSubscription(topicHandle, "name_literal")
+func parseSubscriptionDecl(pctx *parseContext, node *ast.CallExpr) {
+	var name string
+	var topicRef *schema.Ref
+	if len(node.Args) != 2 {
+		pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+		return
+	}
+	if topicIdent, ok := node.Args[0].(*ast.Ident); ok {
+		// Topic is within module
+		// we will find the subscription name from the string literal parameter
+		topicValueSpec, ok := topicIdent.Obj.Decl.(*ast.ValueSpec)
+		if !ok || len(topicValueSpec.Values) != 1 {
+			pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+			return
+		}
+
+		topicCallExpr, ok := topicValueSpec.Values[0].(*ast.CallExpr)
+		if !ok {
+			pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+			return
+		}
+		topicName, schemaErr := extractStringLiteralArg(topicCallExpr, 0)
+		if schemaErr != nil {
+			pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+			return
+		}
+		topicRef = &schema.Ref{
+			Pos:    goPosToSchemaPos(topicIdent.Pos()),
+			Module: pctx.module.Name,
+			Name:   topicName,
+		}
+	} else if topicSelExp, ok := node.Args[0].(*ast.SelectorExpr); ok {
+		// External topic
+		// we will derive subscription name from generated variable name
+		moduleIdent, moduleOk := topicSelExp.X.(*ast.Ident)
+		if !moduleOk {
+			pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+			return
+		}
+		varName := topicSelExp.Sel.Name
+		topicRef = &schema.Ref{
+			Pos:    goPosToSchemaPos(moduleIdent.Pos()),
+			Module: moduleIdent.Name,
+			Name:   strings.ToLower(string(varName[0])) + varName[1:],
+		}
+	} else {
+		pctx.errors.add(errorf(node, "subscription registration must have a topic"))
+		return
+	}
+
+	// name
+	var schemaErr *schema.Error
+	name, schemaErr = extractStringLiteralArg(node, 1)
+	if schemaErr != nil {
+		pctx.errors.add(schemaErr)
+		return
+	}
+
+	// Check for duplicates
+	_, endCol := goNodePosToSchemaPos(node)
+	for _, d := range pctx.module.Decls {
+		existing, ok := d.(*schema.Subscription)
+		if ok && existing.Name == name {
+			pctx.errors.add(errorf(node, "duplicate topic registration at %d:%d-%d", existing.Pos.Line, existing.Pos.Column, endCol))
+			return
+		}
+	}
+
+	decl := &schema.Subscription{
+		Pos:   goPosToSchemaPos(node.Pos()),
+		Name:  name,
+		Topic: topicRef,
+	}
+
+	pctx.module.Decls = append(pctx.module.Decls, decl)
+}
+
+// parseCommentsAndDirectivesForCall finds the variable declaration that we are currently in so we can look for attached comments and directives
+func parseCommentsAndDirectivesForCall(pctx *parseContext, stack []ast.Node) (comments []string, directives []directive) {
+	var variableDecl *ast.GenDecl
+	for i := len(stack) - 1; i >= 0; i-- {
+		if decl, ok := stack[i].(*ast.GenDecl); ok && decl.Tok == token.VAR {
+			variableDecl = decl
+			break
+		}
+	}
+	if variableDecl == nil || variableDecl.Doc == nil {
+		return []string{}, []directive{}
+	}
+	directives, schemaErr := parseDirectives(stack[len(stack)-1], fset, variableDecl.Doc)
+	if schemaErr != nil {
+		pctx.errors.add(schemaErr)
+	}
+	return parseComments(variableDecl.Doc), directives
+}
+
 func visitFile(pctx *parseContext, node *ast.File) {
 	if node.Doc == nil {
 		return
@@ -749,7 +913,7 @@ func visitGenDecl(pctx *parseContext, node *ast.GenDecl) {
 						visitType(pctx, node.Pos(), pctx.pkg.TypesInfo.Defs[t.Name].Type(), isExported)
 					}
 				}
-			case *directiveIngress, *directiveCronJob, *directiveRetry:
+			case *directiveIngress, *directiveCronJob, *directiveRetry, *directiveExport, *directiveSubscriber:
 			}
 		}
 		return
@@ -1049,7 +1213,13 @@ func visitFuncDecl(pctx *parseContext, node *ast.FuncDecl) (verb *schema.Verb) {
 				MinBackoff: dir.MinBackoff,
 				MaxBackoff: dir.MaxBackoff,
 			})
-		case *directiveData, *directiveEnum, *directiveTypeAlias:
+		case *directiveSubscriber:
+			isVerb = true
+			metadata = append(metadata, &schema.MetadataSubscriber{
+				Pos:  dir.Pos,
+				Name: dir.Name,
+			})
+		case *directiveData, *directiveEnum, *directiveTypeAlias, *directiveExport:
 			pctx.errors.add(errorf(node, "unexpected directive %T", dir))
 		}
 	}
@@ -1301,7 +1471,7 @@ func visitType(pctx *parseContext, pos token.Pos, tnode types.Type, isExported b
 			switch decl.(type) {
 			case *schema.TypeAlias, *schema.Enum:
 				return visitNamedRef(pctx, pos, named, isExported)
-			case *schema.Data, *schema.Verb, *schema.Config, *schema.Secret, *schema.Database, *schema.FSM:
+			case *schema.Data, *schema.Verb, *schema.Config, *schema.Secret, *schema.Database, *schema.FSM, *schema.Topic, *schema.Subscription:
 			}
 		}
 	}
@@ -1601,7 +1771,9 @@ func (p *parseContext) markAsExported(node schema.Node) {
 				decl.Export = true
 			case *schema.Verb:
 				decl.Export = true
-			case *schema.Config, *schema.Secret, *schema.Database, *schema.FSM:
+			case *schema.Topic:
+				decl.Export = true
+			case *schema.Config, *schema.Secret, *schema.Database, *schema.FSM, *schema.Subscription:
 				return next()
 			}
 		} else if r, ok := n.(*schema.Ref); ok {
@@ -1610,16 +1782,8 @@ func (p *parseContext) markAsExported(node schema.Node) {
 			}
 			for _, d := range p.module.Decls {
 				switch d := d.(type) {
-				case *schema.Enum:
-					if d.Name != r.Name {
-						continue
-					}
-				case *schema.TypeAlias:
-					if d.Name != r.Name {
-						continue
-					}
-				case *schema.Data:
-					if d.Name != r.Name {
+				case *schema.Enum, *schema.TypeAlias, *schema.Data, *schema.Topic, *schema.Subscription:
+					if named, ok := d.(schema.Named); !ok || named.GetName() != r.Name {
 						continue
 					}
 				case *schema.Verb, *schema.Config, *schema.Secret, *schema.Database, *schema.FSM:
diff --git a/go-runtime/compile/schema_test.go b/go-runtime/compile/schema_test.go
index cb14f6a854..cad9d1377c 100644
--- a/go-runtime/compile/schema_test.go
+++ b/go-runtime/compile/schema_test.go
@@ -228,7 +228,7 @@ func TestExtractModuleSchemaFSM(t *testing.T) {
 	}
 	r, err := ExtractModuleSchema("testdata/fsm", &schema.Schema{})
 	assert.NoError(t, err)
-	assert.Equal(t, r.MustGet().Errors, nil, "expected no schema errors")
+	assert.Equal(t, nil, r.MustGet().Errors, "expected no schema errors")
 	actual := schema.Normalise(r.MustGet().Module)
 	expected := `module fsm {
 		fsm payment
@@ -280,7 +280,7 @@ func TestExtractModuleSchemaNamedTypes(t *testing.T) {
 	}
 	r, err := ExtractModuleSchema("testdata/named", &schema.Schema{})
 	assert.NoError(t, err)
-	assert.Equal(t, r.MustGet().Errors, nil, "expected no schema errors")
+	assert.Equal(t, nil, r.MustGet().Errors, "expected no schema errors")
 	actual := schema.Normalise(r.MustGet().Module)
 	expected := `module named {
 		typealias DoubleAliasedUser named.InternalUser
@@ -332,7 +332,7 @@ func TestExtractModuleSchemaParent(t *testing.T) {
 	}
 	r, err := ExtractModuleSchema("testdata/parent", &schema.Schema{})
 	assert.NoError(t, err)
-	assert.Equal(t, r.MustGet().Errors, nil, "expected no schema errors")
+	assert.Equal(t, nil, r.MustGet().Errors, "expected no schema errors")
 	actual := schema.Normalise(r.MustGet().Module)
 	expected := `module parent {
 			export data ChildStruct {
@@ -345,6 +345,59 @@ func TestExtractModuleSchemaParent(t *testing.T) {
 	assert.Equal(t, normaliseString(expected), normaliseString(actual.String()))
 }
 
+func TestExtractModulePubSub(t *testing.T) {
+	if testing.Short() {
+		t.SkipNow()
+	}
+	r, err := ExtractModuleSchema("testdata/pubsub", &schema.Schema{})
+	assert.NoError(t, err)
+	assert.Equal(t, nil, r.MustGet().Errors, "expected no schema errors")
+	actual := schema.Normalise(r.MustGet().Module)
+	expected := `module pubsub {
+		topic payins pubsub.PayinEvent
+		// publicBroadcast is a topic that broadcasts payin events to the public.
+		// out of order with subscription registration to test ordering doesn't matter.
+		export topic publicBroadcast pubsub.PayinEvent
+		subscription broadcastSubscription pubsub.publicBroadcast
+		subscription paymentProcessing pubsub.payins
+         
+        export data PayinEvent {
+        	name String
+        }
+        
+		verb broadcast(Unit) Unit
+
+        verb payin(Unit) Unit
+
+        verb processBroadcast(pubsub.PayinEvent) Unit
+        	+subscribe broadcastSubscription
+        
+        verb processPayin(pubsub.PayinEvent) Unit
+        	+subscribe paymentProcessing
+	}
+`
+	assert.Equal(t, normaliseString(expected), normaliseString(actual.String()))
+}
+
+func TestExtractModuleSubscriber(t *testing.T) {
+	prebuildTestModule(t, "testdata/pubsub", "testdata/subscriber")
+	if testing.Short() {
+		t.SkipNow()
+	}
+	r, err := ExtractModuleSchema("testdata/subscriber", &schema.Schema{})
+	assert.NoError(t, err)
+	assert.Equal(t, nil, r.MustGet().Errors, "expected no schema errors")
+	actual := schema.Normalise(r.MustGet().Module)
+	expected := `module subscriber {
+		subscription subscriptionToExternalTopic pubsub.publicBroadcast
+
+        verb consumesSubscriptionFromExternalTopic(pubsub.PayinEvent) Unit
+		+subscribe subscriptionToExternalTopic
+	}
+`
+	assert.Equal(t, normaliseString(expected), normaliseString(actual.String()))
+}
+
 func TestParsedirectives(t *testing.T) {
 	tests := []struct {
 		name     string
@@ -438,13 +491,13 @@ func TestErrorReporting(t *testing.T) {
 	filename := filepath.Join(pwd, `testdata/failing/failing.go`)
 	actual := slices.Map(r.MustGet().Errors, func(e *schema.Error) string { return strings.TrimPrefix(e.Error(), filename+":") })
 	expected := []string{
-		`10:13-34: first argument to config and secret declarations must be the name as a string literal`,
+		`10:13-34: expected string literal for argument at index 0`,
 		`13:18-52: duplicate config declaration at 12:18-52`,
 		`16:18-52: duplicate secret declaration at 15:18-52`,
 		`19:14-44: duplicate database declaration at 18:14-44`,
 		`22:2-10: unsupported type "error" for field "BadParam"`,
 		`25:2-17: unsupported type "uint64" for field "AnotherBadParam"`,
-		`28:3-3: unexpected token "export" (expected Directive)`,
+		`29:1-2: unexpected directive *compile.directiveExport`,
 		`34:36-39: unsupported request type "ftl/failing.Request"`,
 		`34:50-50: unsupported response type "ftl/failing.Response"`,
 		`35:16-29: call first argument must be a function but is an unresolved reference to lib.OtherFunc`,
diff --git a/go-runtime/compile/testdata/pubsub/ftl.toml b/go-runtime/compile/testdata/pubsub/ftl.toml
new file mode 100644
index 0000000000..4e493b26ce
--- /dev/null
+++ b/go-runtime/compile/testdata/pubsub/ftl.toml
@@ -0,0 +1,2 @@
+module = "pubsub"
+language = "go"
diff --git a/go-runtime/compile/testdata/pubsub/go.mod b/go-runtime/compile/testdata/pubsub/go.mod
new file mode 100644
index 0000000000..d24796880c
--- /dev/null
+++ b/go-runtime/compile/testdata/pubsub/go.mod
@@ -0,0 +1,45 @@
+module ftl/pubsub
+
+go 1.22.2
+
+toolchain go1.22.3
+
+require github.com/TBD54566975/ftl v0.230.2
+
+require (
+	connectrpc.com/connect v1.16.1 // indirect
+	connectrpc.com/grpcreflect v1.2.0 // indirect
+	connectrpc.com/otelconnect v0.7.0 // indirect
+	github.com/alecthomas/concurrency v0.0.2 // indirect
+	github.com/alecthomas/participle/v2 v2.1.1 // indirect
+	github.com/alecthomas/types v0.16.0 // indirect
+	github.com/alessio/shellescape v1.4.2 // indirect
+	github.com/danieljoos/wincred v1.2.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.6.0 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/multiformats/go-base36 v0.2.0 // indirect
+	github.com/swaggest/jsonschema-go v0.3.70 // indirect
+	github.com/swaggest/refl v1.3.0 // indirect
+	github.com/zalando/go-keyring v0.2.4 // indirect
+	go.opentelemetry.io/otel v1.27.0 // indirect
+	go.opentelemetry.io/otel/metric v1.27.0 // indirect
+	go.opentelemetry.io/otel/trace v1.27.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+)
+
+replace github.com/TBD54566975/ftl => ../../../..
diff --git a/go-runtime/compile/testdata/pubsub/go.sum b/go-runtime/compile/testdata/pubsub/go.sum
new file mode 100644
index 0000000000..03d1ea2819
--- /dev/null
+++ b/go-runtime/compile/testdata/pubsub/go.sum
@@ -0,0 +1,136 @@
+connectrpc.com/connect v1.16.1 h1:rOdrK/RTI/7TVnn3JsVxt3n028MlTRwmK5Q4heSpjis=
+connectrpc.com/connect v1.16.1/go.mod h1:XpZAduBQUySsb4/KO5JffORVkDI4B6/EYPi7N8xpNZw=
+connectrpc.com/grpcreflect v1.2.0 h1:Q6og1S7HinmtbEuBvARLNwYmTbhEGRpHDhqrPNlmK+U=
+connectrpc.com/grpcreflect v1.2.0/go.mod h1:nwSOKmE8nU5u/CidgHtPYk1PFI3U9ignz7iDMxOYkSY=
+connectrpc.com/otelconnect v0.7.0 h1:ZH55ZZtcJOTKWWLy3qmL4Pam4RzRWBJFOqTPyAqCXkY=
+connectrpc.com/otelconnect v0.7.0/go.mod h1:Bt2ivBymHZHqxvo4HkJ0EwHuUzQN6k2l0oH+mp/8nwc=
+github.com/alecthomas/assert/v2 v2.10.0 h1:jjRCHsj6hBJhkmhznrCzoNpbA3zqy0fYiUcYZP/GkPY=
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+github.com/alecthomas/concurrency v0.0.2 h1:Q3kGPtLbleMbH9lHX5OBFvJygfyFw29bXZKBg+IEVuo=
+github.com/alecthomas/concurrency v0.0.2/go.mod h1:GmuQb/iHX7mbNtPlC/WDzEFxDMB0HYFer2Qda9QTs7w=
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diff --git a/go-runtime/compile/testdata/pubsub/pubsub.go b/go-runtime/compile/testdata/pubsub/pubsub.go
new file mode 100644
index 0000000000..4a3dd24f81
--- /dev/null
+++ b/go-runtime/compile/testdata/pubsub/pubsub.go
@@ -0,0 +1,54 @@
+package pubsub
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/TBD54566975/ftl/go-runtime/ftl" // Import the FTL SDK.
+)
+
+type PayinEvent struct {
+	Name string
+}
+
+//ftl:verb
+func Payin(ctx context.Context) error {
+	if err := payinsVar.Publish(PayinEvent{Name: "Test"}); err != nil {
+		return fmt.Errorf("failed to publish event: %w", err)
+	}
+	return nil
+}
+
+//ftl:subscribe paymentProcessing
+func ProcessPayin(ctx context.Context, event PayinEvent) error {
+	logger := ftl.LoggerFromContext(ctx)
+	logger.Infof("Received PubSub event: %v", event)
+	return nil
+}
+
+var _ = ftl.RegisterSubscription(payinsVar, "paymentProcessing")
+
+var payinsVar = ftl.RegisterTopic[PayinEvent]("payins")
+
+var _ = ftl.RegisterSubscription(broadcast, "broadcastSubscription")
+
+// publicBroadcast is a topic that broadcasts payin events to the public.
+// out of order with subscription registration to test ordering doesn't matter.
+//
+//ftl:export
+var broadcast = ftl.RegisterTopic[PayinEvent]("publicBroadcast")
+
+//ftl:verb
+func Broadcast(ctx context.Context) error {
+	if err := broadcast.Publish(PayinEvent{Name: "Broadcast"}); err != nil {
+		return fmt.Errorf("failed to publish broadcast event: %w", err)
+	}
+	return nil
+}
+
+//ftl:subscribe broadcastSubscription
+func ProcessBroadcast(ctx context.Context, event PayinEvent) error {
+	logger := ftl.LoggerFromContext(ctx)
+	logger.Infof("Received broadcast event: %v", event)
+	return nil
+}
diff --git a/go-runtime/compile/testdata/subscriber/ftl.toml b/go-runtime/compile/testdata/subscriber/ftl.toml
new file mode 100644
index 0000000000..5625d0edbf
--- /dev/null
+++ b/go-runtime/compile/testdata/subscriber/ftl.toml
@@ -0,0 +1,2 @@
+module = "subscriber"
+language = "go"
diff --git a/go-runtime/compile/testdata/subscriber/go.mod b/go-runtime/compile/testdata/subscriber/go.mod
new file mode 100644
index 0000000000..a90aaed94b
--- /dev/null
+++ b/go-runtime/compile/testdata/subscriber/go.mod
@@ -0,0 +1,45 @@
+module ftl/subscriber
+
+go 1.22.2
+
+toolchain go1.22.3
+
+require github.com/TBD54566975/ftl v0.231.0
+
+require (
+	connectrpc.com/connect v1.16.1 // indirect
+	connectrpc.com/grpcreflect v1.2.0 // indirect
+	connectrpc.com/otelconnect v0.7.0 // indirect
+	github.com/alecthomas/concurrency v0.0.2 // indirect
+	github.com/alecthomas/participle/v2 v2.1.1 // indirect
+	github.com/alecthomas/types v0.16.0 // indirect
+	github.com/alessio/shellescape v1.4.2 // indirect
+	github.com/danieljoos/wincred v1.2.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgx/v5 v5.6.0 // indirect
+	github.com/jackc/puddle/v2 v2.2.1 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/multiformats/go-base36 v0.2.0 // indirect
+	github.com/swaggest/jsonschema-go v0.3.70 // indirect
+	github.com/swaggest/refl v1.3.0 // indirect
+	github.com/zalando/go-keyring v0.2.4 // indirect
+	go.opentelemetry.io/otel v1.27.0 // indirect
+	go.opentelemetry.io/otel/metric v1.27.0 // indirect
+	go.opentelemetry.io/otel/trace v1.27.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+)
+
+replace github.com/TBD54566975/ftl => ../../../..
diff --git a/go-runtime/compile/testdata/subscriber/go.sum b/go-runtime/compile/testdata/subscriber/go.sum
new file mode 100644
index 0000000000..03d1ea2819
--- /dev/null
+++ b/go-runtime/compile/testdata/subscriber/go.sum
@@ -0,0 +1,136 @@
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+connectrpc.com/connect v1.16.1/go.mod h1:XpZAduBQUySsb4/KO5JffORVkDI4B6/EYPi7N8xpNZw=
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+connectrpc.com/grpcreflect v1.2.0/go.mod h1:nwSOKmE8nU5u/CidgHtPYk1PFI3U9ignz7iDMxOYkSY=
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diff --git a/go-runtime/compile/testdata/subscriber/subscriber.go b/go-runtime/compile/testdata/subscriber/subscriber.go
new file mode 100644
index 0000000000..b44248623f
--- /dev/null
+++ b/go-runtime/compile/testdata/subscriber/subscriber.go
@@ -0,0 +1,15 @@
+package subscriber
+
+import (
+	"context"
+	"ftl/pubsub"
+
+	"github.com/TBD54566975/ftl/go-runtime/ftl"
+)
+
+var _ = ftl.RegisterSubscription(pubsub.PublicBroadcast, "subscriptionToExternalTopic")
+
+//ftl:subscribe subscriptionToExternalTopic
+func ConsumesSubscriptionFromExternalTopic(ctx context.Context, req pubsub.PayinEvent) error {
+	return nil
+}
diff --git a/go-runtime/ftl/pubsub.go b/go-runtime/ftl/pubsub.go
new file mode 100644
index 0000000000..c5529f0c81
--- /dev/null
+++ b/go-runtime/ftl/pubsub.go
@@ -0,0 +1,28 @@
+package ftl
+
+// RegisterTopic declares a topic
+//
+// Topics publish events, and subscriptions can listen to them.
+func RegisterTopic[E any](name string) Topic[E] {
+	return Topic[E]{name: name}
+}
+
+type Topic[E any] struct {
+	name string
+}
+
+// Publish publishes an event to a topic
+func (t Topic[E]) Publish(event E) error {
+	panic("not implemented")
+}
+
+// RegisterSubscription declares a subscription to a topic
+//
+// Sinks can consume events from the subscription by including a "ftl:subscibe <subscription_name>" directive
+func RegisterSubscription[E any](topic Topic[E], name string) Subscription[E] {
+	return Subscription[E]{name: name}
+}
+
+type Subscription[E any] struct {
+	name string
+}
diff --git a/internal/slices/slices.go b/internal/slices/slices.go
index 89156f2f62..85266a94fa 100644
--- a/internal/slices/slices.go
+++ b/internal/slices/slices.go
@@ -78,3 +78,13 @@ func Find[T any](slice []T, fn func(T) bool) (T, bool) {
 	var zero T
 	return zero, false
 }
+
+func FindVariant[T any, U any](slice []U) (T, bool) {
+	for _, el := range slice {
+		if found, ok := any(el).(T); ok {
+			return found, true
+		}
+	}
+	var zero T
+	return zero, false
+}