diff --git a/backend/controller/console.go b/backend/controller/console.go
index 37a11047a4..041091a303 100644
--- a/backend/controller/console.go
+++ b/backend/controller/console.go
@@ -106,7 +106,7 @@ func (c *ConsoleService) GetModules(ctx context.Context, req *connect.Request[pb
 					Config: c,
 				})
 
-			case *schema.Database, *schema.Enum:
+			case *schema.Database, *schema.Enum, *schema.SumType:
 			}
 		}
 
diff --git a/backend/controller/ingress/ingress.go b/backend/controller/ingress/ingress.go
index 19f263b707..74dc50df07 100644
--- a/backend/controller/ingress/ingress.go
+++ b/backend/controller/ingress/ingress.go
@@ -223,6 +223,18 @@ func validateValue(fieldType schema.Type, path path, value any, sch *schema.Sche
 				return fmt.Errorf("%s is not a valid variant of enum %s", value, fieldType)
 			}
 
+		case *schema.SumType:
+			for _, v := range d.Variants {
+				err := validateValue(v, path, value, sch)
+				if err == nil {
+					typeMatches = true
+					break
+				}
+			}
+			if !typeMatches {
+				return fmt.Errorf("%v is not a valid variant of sumtype %s", value, fieldType)
+			}
+
 		case *schema.Config, *schema.Database, *schema.Secret:
 
 		}
diff --git a/backend/controller/ingress/ingress_test.go b/backend/controller/ingress/ingress_test.go
index a9cc10c265..461beb40c0 100644
--- a/backend/controller/ingress/ingress_test.go
+++ b/backend/controller/ingress/ingress_test.go
@@ -365,3 +365,52 @@ func TestEnumValidation(t *testing.T) {
 		}
 	}
 }
+
+func TestSumTypeValidation(t *testing.T) {
+	sch := &schema.Schema{
+		Modules: []*schema.Module{
+			{Name: "test", Decls: []schema.Decl{
+				&schema.SumType{
+					Name:     "IntOrBool",
+					Variants: []schema.Type{&schema.Int{}, &schema.Bool{}},
+				},
+				&schema.Data{
+					Name: "SumTypeRequest",
+					Fields: []*schema.Field{
+						{Name: "message", Type: &schema.Ref{Name: "IntOrBool", Module: "test"}},
+					},
+				},
+				&schema.Data{
+					Name: "OptionalSumTypeRequest",
+					Fields: []*schema.Field{
+						{Name: "message", Type: &schema.Optional{
+							Type: &schema.Ref{Name: "IntOrBool", Module: "test"},
+						}},
+					},
+				},
+			}},
+		},
+	}
+
+	tests := []struct {
+		validateRoot *schema.Ref
+		req          obj
+		err          string
+	}{
+		{&schema.Ref{Name: "SumTypeRequest", Module: "test"}, obj{"message": true}, ""},
+		{&schema.Ref{Name: "SumTypeRequest", Module: "test"}, obj{"message": 10.0}, ""},
+		{&schema.Ref{Name: "OptionalSumTypeRequest", Module: "test"}, obj{}, ""},
+		{&schema.Ref{Name: "OptionalSumTypeRequest", Module: "test"}, obj{"message": 10.0}, ""},
+		{&schema.Ref{Name: "SumTypeRequest", Module: "test"}, obj{"message": "akxznc"},
+			"akxznc is not a valid variant of sumtype test.IntOrBool"},
+	}
+
+	for _, test := range tests {
+		err := validateValue(test.validateRoot, []string{test.validateRoot.String()}, test.req, sch)
+		if test.err == "" {
+			assert.NoError(t, err)
+		} else {
+			assert.Contains(t, err.Error(), test.err)
+		}
+	}
+}
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 d727abacbf..7aec0956f0 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
@@ -444,6 +444,7 @@ type Decl struct {
 	//	*Decl_Enum
 	//	*Decl_Config
 	//	*Decl_Secret
+	//	*Decl_SumType
 	Value isDecl_Value `protobuf_oneof:"value"`
 }
 
@@ -528,6 +529,13 @@ func (x *Decl) GetSecret() *Secret {
 	return nil
 }
 
+func (x *Decl) GetSumType() *SumType {
+	if x, ok := x.GetValue().(*Decl_SumType); ok {
+		return x.SumType
+	}
+	return nil
+}
+
 type isDecl_Value interface {
 	isDecl_Value()
 }
@@ -556,6 +564,10 @@ type Decl_Secret struct {
 	Secret *Secret `protobuf:"bytes,6,opt,name=secret,proto3,oneof"`
 }
 
+type Decl_SumType struct {
+	SumType *SumType `protobuf:"bytes,7,opt,name=sumType,proto3,oneof"`
+}
+
 func (*Decl_Data) isDecl_Value() {}
 
 func (*Decl_Verb) isDecl_Value() {}
@@ -568,6 +580,8 @@ func (*Decl_Config) isDecl_Value() {}
 
 func (*Decl_Secret) isDecl_Value() {}
 
+func (*Decl_SumType) isDecl_Value() {}
+
 type Enum struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2228,6 +2242,77 @@ func (x *StringValue) GetValue() string {
 	return ""
 }
 
+type SumType 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"`
+	Variants []*Type   `protobuf:"bytes,4,rep,name=variants,proto3" json:"variants,omitempty"`
+}
+
+func (x *SumType) Reset() {
+	*x = SumType{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[34]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SumType) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SumType) ProtoMessage() {}
+
+func (x *SumType) ProtoReflect() protoreflect.Message {
+	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 {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SumType.ProtoReflect.Descriptor instead.
+func (*SumType) Descriptor() ([]byte, []int) {
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{34}
+}
+
+func (x *SumType) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
+func (x *SumType) GetComments() []string {
+	if x != nil {
+		return x.Comments
+	}
+	return nil
+}
+
+func (x *SumType) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *SumType) GetVariants() []*Type {
+	if x != nil {
+		return x.Variants
+	}
+	return nil
+}
+
 type Time struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2239,7 +2324,7 @@ type Time struct {
 func (x *Time) Reset() {
 	*x = Time{}
 	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)
 	}
@@ -2252,7 +2337,7 @@ func (x *Time) String() string {
 func (*Time) ProtoMessage() {}
 
 func (x *Time) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[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 {
@@ -2265,7 +2350,7 @@ 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{34}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{35}
 }
 
 func (x *Time) GetPos() *Position {
@@ -2300,7 +2385,7 @@ type Type struct {
 func (x *Type) Reset() {
 	*x = Type{}
 	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)
 	}
@@ -2313,7 +2398,7 @@ func (x *Type) String() string {
 func (*Type) ProtoMessage() {}
 
 func (x *Type) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[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 {
@@ -2326,7 +2411,7 @@ 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{35}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{36}
 }
 
 func (m *Type) GetValue() isType_Value {
@@ -2508,7 +2593,7 @@ type TypeParameter struct {
 func (x *TypeParameter) Reset() {
 	*x = TypeParameter{}
 	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)
 	}
@@ -2521,7 +2606,7 @@ func (x *TypeParameter) String() string {
 func (*TypeParameter) ProtoMessage() {}
 
 func (x *TypeParameter) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[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 {
@@ -2534,7 +2619,7 @@ 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{36}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{37}
 }
 
 func (x *TypeParameter) GetPos() *Position {
@@ -2562,7 +2647,7 @@ type Unit struct {
 func (x *Unit) Reset() {
 	*x = Unit{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2575,7 +2660,7 @@ func (x *Unit) String() string {
 func (*Unit) ProtoMessage() {}
 
 func (x *Unit) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[37]
+	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 {
@@ -2588,7 +2673,7 @@ 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{37}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{38}
 }
 
 func (x *Unit) GetPos() *Position {
@@ -2613,7 +2698,7 @@ type Value struct {
 func (x *Value) Reset() {
 	*x = Value{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2626,7 +2711,7 @@ func (x *Value) String() string {
 func (*Value) ProtoMessage() {}
 
 func (x *Value) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[38]
+	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 {
@@ -2639,7 +2724,7 @@ 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{38}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{39}
 }
 
 func (m *Value) GetValue() isValue_Value {
@@ -2696,7 +2781,7 @@ type Verb struct {
 func (x *Verb) Reset() {
 	*x = Verb{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
+		mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2709,7 +2794,7 @@ func (x *Verb) String() string {
 func (*Verb) ProtoMessage() {}
 
 func (x *Verb) ProtoReflect() protoreflect.Message {
-	mi := &file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[39]
+	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 {
@@ -2722,7 +2807,7 @@ 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{39}
+	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{40}
 }
 
 func (x *Verb) GetRuntime() *VerbRuntime {
@@ -2842,7 +2927,7 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
 	0x6f, 0x73, 0x88, 0x01, 0x01, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x02, 0x20,
 	0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x1a, 0x0a, 0x08, 0x63, 0x6f, 0x6d,
 	0x6d, 0x65, 0x6e, 0x74, 0x73, 0x18, 0x03, 0x20, 0x03, 0x28, 0x09, 0x52, 0x08, 0x63, 0x6f, 0x6d,
-	0x6d, 0x65, 0x6e, 0x74, 0x73, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x70, 0x6f, 0x73, 0x22, 0xe5, 0x02,
+	0x6d, 0x65, 0x6e, 0x74, 0x73, 0x42, 0x06, 0x0a, 0x04, 0x5f, 0x70, 0x6f, 0x73, 0x22, 0xa3, 0x03,
 	0x0a, 0x04, 0x44, 0x65, 0x63, 0x6c, 0x12, 0x33, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01,
 	0x20, 0x01, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x78, 0x79, 0x7a, 0x2e, 0x62, 0x6c, 0x6f, 0x63, 0x6b,
 	0x2e, 0x66, 0x74, 0x6c, 0x2e, 0x76, 0x31, 0x2e, 0x73, 0x63, 0x68, 0x65, 0x6d, 0x61, 0x2e, 0x44,
@@ -2864,352 +2949,367 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
 	0x67, 0x12, 0x39, 0x0a, 0x06, 0x73, 0x65, 0x63, 0x72, 0x65, 0x74, 0x18, 0x06, 0x20, 0x01, 0x28,
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 }
 
 var (
@@ -3224,7 +3324,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP() []byte {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescData
 }
 
-var file_xyz_block_ftl_v1_schema_schema_proto_msgTypes = make([]protoimpl.MessageInfo, 40)
+var file_xyz_block_ftl_v1_schema_schema_proto_msgTypes = make([]protoimpl.MessageInfo, 41)
 var file_xyz_block_ftl_v1_schema_schema_proto_goTypes = []interface{}{
 	(*Any)(nil),                  // 0: xyz.block.ftl.v1.schema.Any
 	(*Array)(nil),                // 1: xyz.block.ftl.v1.schema.Array
@@ -3260,107 +3360,111 @@ var file_xyz_block_ftl_v1_schema_schema_proto_goTypes = []interface{}{
 	(*Secret)(nil),               // 31: xyz.block.ftl.v1.schema.Secret
 	(*String)(nil),               // 32: xyz.block.ftl.v1.schema.String
 	(*StringValue)(nil),          // 33: xyz.block.ftl.v1.schema.StringValue
-	(*Time)(nil),                 // 34: xyz.block.ftl.v1.schema.Time
-	(*Type)(nil),                 // 35: xyz.block.ftl.v1.schema.Type
-	(*TypeParameter)(nil),        // 36: xyz.block.ftl.v1.schema.TypeParameter
-	(*Unit)(nil),                 // 37: xyz.block.ftl.v1.schema.Unit
-	(*Value)(nil),                // 38: xyz.block.ftl.v1.schema.Value
-	(*Verb)(nil),                 // 39: xyz.block.ftl.v1.schema.Verb
-	(*ModuleRuntime)(nil),        // 40: xyz.block.ftl.v1.schema.ModuleRuntime
-	(*VerbRuntime)(nil),          // 41: xyz.block.ftl.v1.schema.VerbRuntime
+	(*SumType)(nil),              // 34: xyz.block.ftl.v1.schema.SumType
+	(*Time)(nil),                 // 35: xyz.block.ftl.v1.schema.Time
+	(*Type)(nil),                 // 36: xyz.block.ftl.v1.schema.Type
+	(*TypeParameter)(nil),        // 37: xyz.block.ftl.v1.schema.TypeParameter
+	(*Unit)(nil),                 // 38: xyz.block.ftl.v1.schema.Unit
+	(*Value)(nil),                // 39: xyz.block.ftl.v1.schema.Value
+	(*Verb)(nil),                 // 40: xyz.block.ftl.v1.schema.Verb
+	(*ModuleRuntime)(nil),        // 41: xyz.block.ftl.v1.schema.ModuleRuntime
+	(*VerbRuntime)(nil),          // 42: xyz.block.ftl.v1.schema.VerbRuntime
 }
 var file_xyz_block_ftl_v1_schema_schema_proto_depIdxs = []int32{
 	28, // 0: xyz.block.ftl.v1.schema.Any.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	28, // 1: xyz.block.ftl.v1.schema.Array.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 2: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
+	36, // 2: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
 	28, // 3: xyz.block.ftl.v1.schema.Bool.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	28, // 4: xyz.block.ftl.v1.schema.Bytes.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	28, // 5: xyz.block.ftl.v1.schema.Config.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 6: xyz.block.ftl.v1.schema.Config.type:type_name -> xyz.block.ftl.v1.schema.Type
+	36, // 6: xyz.block.ftl.v1.schema.Config.type:type_name -> xyz.block.ftl.v1.schema.Type
 	28, // 7: xyz.block.ftl.v1.schema.Data.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	12, // 8: xyz.block.ftl.v1.schema.Data.fields:type_name -> xyz.block.ftl.v1.schema.Field
 	20, // 9: xyz.block.ftl.v1.schema.Data.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	36, // 10: xyz.block.ftl.v1.schema.Data.typeParameters:type_name -> xyz.block.ftl.v1.schema.TypeParameter
+	37, // 10: xyz.block.ftl.v1.schema.Data.typeParameters:type_name -> xyz.block.ftl.v1.schema.TypeParameter
 	28, // 11: xyz.block.ftl.v1.schema.Database.pos:type_name -> xyz.block.ftl.v1.schema.Position
 	5,  // 12: xyz.block.ftl.v1.schema.Decl.data:type_name -> xyz.block.ftl.v1.schema.Data
-	39, // 13: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
+	40, // 13: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
 	6,  // 14: xyz.block.ftl.v1.schema.Decl.database:type_name -> xyz.block.ftl.v1.schema.Database
 	8,  // 15: xyz.block.ftl.v1.schema.Decl.enum:type_name -> xyz.block.ftl.v1.schema.Enum
 	4,  // 16: xyz.block.ftl.v1.schema.Decl.config:type_name -> xyz.block.ftl.v1.schema.Config
 	31, // 17: xyz.block.ftl.v1.schema.Decl.secret:type_name -> xyz.block.ftl.v1.schema.Secret
-	28, // 18: xyz.block.ftl.v1.schema.Enum.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 19: xyz.block.ftl.v1.schema.Enum.type:type_name -> xyz.block.ftl.v1.schema.Type
-	9,  // 20: xyz.block.ftl.v1.schema.Enum.variants:type_name -> xyz.block.ftl.v1.schema.EnumVariant
-	28, // 21: xyz.block.ftl.v1.schema.EnumVariant.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	38, // 22: xyz.block.ftl.v1.schema.EnumVariant.value:type_name -> xyz.block.ftl.v1.schema.Value
-	28, // 23: xyz.block.ftl.v1.schema.Error.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	10, // 24: xyz.block.ftl.v1.schema.ErrorList.errors:type_name -> xyz.block.ftl.v1.schema.Error
-	28, // 25: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 26: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
-	20, // 27: xyz.block.ftl.v1.schema.Field.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	28, // 28: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	15, // 29: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathLiteral:type_name -> xyz.block.ftl.v1.schema.IngressPathLiteral
-	16, // 30: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathParameter:type_name -> xyz.block.ftl.v1.schema.IngressPathParameter
-	28, // 31: xyz.block.ftl.v1.schema.IngressPathLiteral.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 32: xyz.block.ftl.v1.schema.IngressPathParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 33: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 34: xyz.block.ftl.v1.schema.IntValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 35: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 36: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
-	35, // 37: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
-	22, // 38: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
-	25, // 39: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
-	23, // 40: xyz.block.ftl.v1.schema.Metadata.cronJob:type_name -> xyz.block.ftl.v1.schema.MetadataCronJob
-	24, // 41: xyz.block.ftl.v1.schema.Metadata.databases:type_name -> xyz.block.ftl.v1.schema.MetadataDatabases
-	21, // 42: xyz.block.ftl.v1.schema.Metadata.alias:type_name -> xyz.block.ftl.v1.schema.MetadataAlias
-	28, // 43: xyz.block.ftl.v1.schema.MetadataAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 44: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	29, // 45: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	28, // 46: xyz.block.ftl.v1.schema.MetadataCronJob.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 47: xyz.block.ftl.v1.schema.MetadataDatabases.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	29, // 48: xyz.block.ftl.v1.schema.MetadataDatabases.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	28, // 49: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	14, // 50: xyz.block.ftl.v1.schema.MetadataIngress.path:type_name -> xyz.block.ftl.v1.schema.IngressPathComponent
-	40, // 51: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
-	28, // 52: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	7,  // 53: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
-	28, // 54: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 55: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
-	28, // 56: xyz.block.ftl.v1.schema.Ref.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 57: xyz.block.ftl.v1.schema.Ref.typeParameters:type_name -> xyz.block.ftl.v1.schema.Type
-	28, // 58: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	26, // 59: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
-	28, // 60: xyz.block.ftl.v1.schema.Secret.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 61: xyz.block.ftl.v1.schema.Secret.type:type_name -> xyz.block.ftl.v1.schema.Type
-	28, // 62: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 63: xyz.block.ftl.v1.schema.StringValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 64: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	17, // 65: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
-	13, // 66: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
-	32, // 67: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
-	3,  // 68: xyz.block.ftl.v1.schema.Type.bytes:type_name -> xyz.block.ftl.v1.schema.Bytes
-	2,  // 69: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
-	34, // 70: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
-	1,  // 71: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
-	19, // 72: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
-	0,  // 73: xyz.block.ftl.v1.schema.Type.any:type_name -> xyz.block.ftl.v1.schema.Any
-	37, // 74: xyz.block.ftl.v1.schema.Type.unit:type_name -> xyz.block.ftl.v1.schema.Unit
-	29, // 75: xyz.block.ftl.v1.schema.Type.ref:type_name -> xyz.block.ftl.v1.schema.Ref
-	27, // 76: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
-	28, // 77: xyz.block.ftl.v1.schema.TypeParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	28, // 78: xyz.block.ftl.v1.schema.Unit.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33, // 79: xyz.block.ftl.v1.schema.Value.stringValue:type_name -> xyz.block.ftl.v1.schema.StringValue
-	18, // 80: xyz.block.ftl.v1.schema.Value.intValue:type_name -> xyz.block.ftl.v1.schema.IntValue
-	41, // 81: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
-	28, // 82: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	35, // 83: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.Type
-	35, // 84: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.Type
-	20, // 85: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	86, // [86:86] is the sub-list for method output_type
-	86, // [86:86] is the sub-list for method input_type
-	86, // [86:86] is the sub-list for extension type_name
-	86, // [86:86] is the sub-list for extension extendee
-	0,  // [0:86] is the sub-list for field type_name
+	34, // 18: xyz.block.ftl.v1.schema.Decl.sumType:type_name -> xyz.block.ftl.v1.schema.SumType
+	28, // 19: xyz.block.ftl.v1.schema.Enum.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 20: xyz.block.ftl.v1.schema.Enum.type:type_name -> xyz.block.ftl.v1.schema.Type
+	9,  // 21: xyz.block.ftl.v1.schema.Enum.variants:type_name -> xyz.block.ftl.v1.schema.EnumVariant
+	28, // 22: xyz.block.ftl.v1.schema.EnumVariant.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	39, // 23: xyz.block.ftl.v1.schema.EnumVariant.value:type_name -> xyz.block.ftl.v1.schema.Value
+	28, // 24: xyz.block.ftl.v1.schema.Error.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	10, // 25: xyz.block.ftl.v1.schema.ErrorList.errors:type_name -> xyz.block.ftl.v1.schema.Error
+	28, // 26: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 27: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
+	20, // 28: xyz.block.ftl.v1.schema.Field.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	28, // 29: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	15, // 30: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathLiteral:type_name -> xyz.block.ftl.v1.schema.IngressPathLiteral
+	16, // 31: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathParameter:type_name -> xyz.block.ftl.v1.schema.IngressPathParameter
+	28, // 32: xyz.block.ftl.v1.schema.IngressPathLiteral.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 33: xyz.block.ftl.v1.schema.IngressPathParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 34: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 35: xyz.block.ftl.v1.schema.IntValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 36: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 37: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
+	36, // 38: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
+	22, // 39: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
+	25, // 40: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
+	23, // 41: xyz.block.ftl.v1.schema.Metadata.cronJob:type_name -> xyz.block.ftl.v1.schema.MetadataCronJob
+	24, // 42: xyz.block.ftl.v1.schema.Metadata.databases:type_name -> xyz.block.ftl.v1.schema.MetadataDatabases
+	21, // 43: xyz.block.ftl.v1.schema.Metadata.alias:type_name -> xyz.block.ftl.v1.schema.MetadataAlias
+	28, // 44: xyz.block.ftl.v1.schema.MetadataAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 45: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	29, // 46: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.Ref
+	28, // 47: xyz.block.ftl.v1.schema.MetadataCronJob.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 48: xyz.block.ftl.v1.schema.MetadataDatabases.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	29, // 49: xyz.block.ftl.v1.schema.MetadataDatabases.calls:type_name -> xyz.block.ftl.v1.schema.Ref
+	28, // 50: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	14, // 51: xyz.block.ftl.v1.schema.MetadataIngress.path:type_name -> xyz.block.ftl.v1.schema.IngressPathComponent
+	41, // 52: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
+	28, // 53: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	7,  // 54: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
+	28, // 55: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 56: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
+	28, // 57: xyz.block.ftl.v1.schema.Ref.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 58: xyz.block.ftl.v1.schema.Ref.typeParameters:type_name -> xyz.block.ftl.v1.schema.Type
+	28, // 59: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	26, // 60: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
+	28, // 61: xyz.block.ftl.v1.schema.Secret.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 62: xyz.block.ftl.v1.schema.Secret.type:type_name -> xyz.block.ftl.v1.schema.Type
+	28, // 63: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 64: xyz.block.ftl.v1.schema.StringValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 65: xyz.block.ftl.v1.schema.SumType.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 66: xyz.block.ftl.v1.schema.SumType.variants:type_name -> xyz.block.ftl.v1.schema.Type
+	28, // 67: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	17, // 68: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
+	13, // 69: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
+	32, // 70: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
+	3,  // 71: xyz.block.ftl.v1.schema.Type.bytes:type_name -> xyz.block.ftl.v1.schema.Bytes
+	2,  // 72: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
+	35, // 73: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
+	1,  // 74: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
+	19, // 75: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
+	0,  // 76: xyz.block.ftl.v1.schema.Type.any:type_name -> xyz.block.ftl.v1.schema.Any
+	38, // 77: xyz.block.ftl.v1.schema.Type.unit:type_name -> xyz.block.ftl.v1.schema.Unit
+	29, // 78: xyz.block.ftl.v1.schema.Type.ref:type_name -> xyz.block.ftl.v1.schema.Ref
+	27, // 79: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
+	28, // 80: xyz.block.ftl.v1.schema.TypeParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	28, // 81: xyz.block.ftl.v1.schema.Unit.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	33, // 82: xyz.block.ftl.v1.schema.Value.stringValue:type_name -> xyz.block.ftl.v1.schema.StringValue
+	18, // 83: xyz.block.ftl.v1.schema.Value.intValue:type_name -> xyz.block.ftl.v1.schema.IntValue
+	42, // 84: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
+	28, // 85: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	36, // 86: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.Type
+	36, // 87: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.Type
+	20, // 88: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	89, // [89:89] is the sub-list for method output_type
+	89, // [89:89] is the sub-list for method input_type
+	89, // [89:89] is the sub-list for extension type_name
+	89, // [89:89] is the sub-list for extension extendee
+	0,  // [0:89] is the sub-list for field type_name
 }
 
 func init() { file_xyz_block_ftl_v1_schema_schema_proto_init() }
@@ -3779,7 +3883,7 @@ 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.(*Time); i {
+			switch v := v.(*SumType); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3791,7 +3895,7 @@ 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.(*Type); i {
+			switch v := v.(*Time); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3803,7 +3907,7 @@ 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.(*TypeParameter); i {
+			switch v := v.(*Type); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3815,7 +3919,7 @@ 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.(*Unit); i {
+			switch v := v.(*TypeParameter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3827,7 +3931,7 @@ 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.(*Value); i {
+			switch v := v.(*Unit); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3839,6 +3943,18 @@ 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.(*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[40].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Verb); i {
 			case 0:
 				return &v.state
@@ -3865,6 +3981,7 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 		(*Decl_Enum)(nil),
 		(*Decl_Config)(nil),
 		(*Decl_Secret)(nil),
+		(*Decl_SumType)(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{}{}
@@ -3899,7 +4016,8 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[32].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[35].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[36].OneofWrappers = []interface{}{
 		(*Type_Int)(nil),
 		(*Type_Float)(nil),
 		(*Type_String_)(nil),
@@ -3913,20 +4031,20 @@ 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[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{}{
 		(*Value_StringValue)(nil),
 		(*Value_IntValue)(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{}{}
 	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:      0,
-			NumMessages:   40,
+			NumMessages:   41,
 			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 e41cf8e13e..4a61a58672 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.proto
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.proto
@@ -54,6 +54,7 @@ message Decl {
     Enum enum = 4;
     Config config = 5;
     Secret secret = 6;
+    SumType sumType = 7;
   }
 }
 
@@ -212,6 +213,13 @@ message StringValue {
   string value = 2;
 }
 
+message SumType {
+  optional Position pos = 1;
+  repeated string comments = 2;
+  string name = 3;
+  repeated Type variants = 4;
+}
+
 message Time {
   optional Position pos = 1;
 }
diff --git a/backend/schema/data.go b/backend/schema/data.go
index fc6c81aa2b..eab42a1943 100644
--- a/backend/schema/data.go
+++ b/backend/schema/data.go
@@ -120,7 +120,7 @@ func (d *Data) Monomorphise(ref *Ref) (*Data, error) {
 			IngressPathComponent, *IngressPathLiteral, *IngressPathParameter, *Int,
 			Metadata, *MetadataCalls, *MetadataDatabases, *MetadataIngress, *MetadataCronJob,
 			*MetadataAlias, *Module, *Schema, *String, *Time, Type, *TypeParameter,
-			*Unit, *Verb, *Enum, *EnumVariant,
+			*Unit, *Verb, *Enum, *EnumVariant, *SumType,
 			Value, *IntValue, *StringValue, Symbol, Named:
 		}
 		return next()
diff --git a/backend/schema/jsonschema.go b/backend/schema/jsonschema.go
index ece73ed758..95da2807aa 100644
--- a/backend/schema/jsonschema.go
+++ b/backend/schema/jsonschema.go
@@ -45,6 +45,8 @@ func DataToJSONSchema(sch *Schema, ref Ref) (*jsonschema.Schema, error) {
 			}
 		case *Enum:
 			root.Definitions[r.String()] = jsonschema.SchemaOrBool{TypeObject: nodeToJSSchema(n, refs)}
+		case *SumType:
+			root.Definitions[r.String()] = jsonschema.SchemaOrBool{TypeObject: nodeToJSSchema(n, refs)}
 		case *Config, *Database, *Secret, *Verb:
 			return nil, fmt.Errorf("reference to unsupported node type %T", decl)
 		}
@@ -161,6 +163,21 @@ func nodeToJSSchema(node Node, refs map[RefKey]*Ref) *jsonschema.Schema {
 	case *TypeParameter:
 		return &jsonschema.Schema{}
 
+	case *SumType:
+		variants := make([]jsonschema.SchemaOrBool, len(node.Variants))
+		for i, v := range node.Variants {
+			variants[i] = jsonschema.SchemaOrBool{TypeObject: nodeToJSSchema(v, refs)}
+		}
+		st := jsonschema.String
+		properties := make(map[string]jsonschema.SchemaOrBool)
+		properties["@_kind"] = jsonschema.SchemaOrBool{
+			TypeObject: &jsonschema.Schema{Type: &jsonschema.Type{SimpleTypes: &st}},
+		}
+		return &jsonschema.Schema{
+			Properties: properties,
+			OneOf:      variants,
+		}
+
 	case Decl, *Field, Metadata, *MetadataCalls, *MetadataDatabases, *MetadataIngress,
 		*MetadataAlias, IngressPathComponent, *IngressPathLiteral, *IngressPathParameter, *Module,
 		*Schema, Type, *Database, *Verb, *EnumVariant, *MetadataCronJob,
diff --git a/backend/schema/jsonschema_test.go b/backend/schema/jsonschema_test.go
index ec7fa6a570..3946578fc7 100644
--- a/backend/schema/jsonschema_test.go
+++ b/backend/schema/jsonschema_test.go
@@ -32,6 +32,7 @@ var jsonSchemaSample = &Schema{
 					{Name: "keyValue", Type: &Ref{Module: "foo", Name: "Generic", TypeParameters: []Type{&String{}, &Int{}}}},
 					{Name: "stringEnumRef", Type: &Ref{Module: "foo", Name: "StringEnum"}},
 					{Name: "intEnumRef", Type: &Ref{Module: "foo", Name: "IntEnum"}},
+					{Name: "sumTypeRef", Type: &Ref{Module: "foo", Name: "IntOrBool"}},
 				},
 			},
 			&Data{
@@ -59,6 +60,10 @@ var jsonSchemaSample = &Schema{
 					{Name: "One", Value: &IntValue{Value: 1}},
 				},
 			},
+			&SumType{
+				Name:     "IntOrBool",
+				Variants: []Type{&Int{}, &Bool{}},
+			},
 		}},
 		{Name: "bar", Decls: []Decl{
 			&Data{Name: "Bar", Fields: []*Field{{Name: "bar", Type: &String{}}}},
@@ -89,7 +94,8 @@ func TestDataToJSONSchema(t *testing.T) {
     "any",
     "keyValue",
     "stringEnumRef",
-    "intEnumRef"
+    "intEnumRef",
+    "sumTypeRef"
   ],
   "additionalProperties": false,
   "definitions": {
@@ -127,6 +133,21 @@ func TestDataToJSONSchema(t *testing.T) {
         1
       ]
     },
+    "foo.IntOrBool": {
+      "properties": {
+        "@_kind": {
+          "type": "string"
+        }
+      },
+      "oneOf": [
+        {
+          "type": "integer"
+        },
+        {
+          "type": "boolean"
+        }
+      ]
+    },
     "foo.Item": {
       "required": [
         "name"
@@ -242,6 +263,9 @@ func TestDataToJSONSchema(t *testing.T) {
     "stringEnumRef": {
       "$ref": "#/definitions/foo.StringEnum"
     },
+    "sumTypeRef": {
+      "$ref": "#/definitions/foo.IntOrBool"
+    },
     "time": {
       "type": "string",
       "format": "date-time"
@@ -270,7 +294,8 @@ func TestJSONSchemaValidation(t *testing.T) {
     "any": [{"name": "Name"}, "string", 1, 1.23, true, "2018-11-13T20:20:39+00:00", ["one"], {"one": 2}, null],
     "keyValue": {"key": "string", "value": 1},
 	"stringEnumRef": "A",
-	"intEnumRef": 0
+	"intEnumRef": 0,
+        "sumTypeRef": 10
   }
    `
 
@@ -307,7 +332,8 @@ func TestInvalidEnumValidation(t *testing.T) {
     "any": [{"name": "Name"}, "string", 1, 1.23, true, "2018-11-13T20:20:39+00:00", ["one"], {"one": 2}, null],
     "keyValue": {"key": "string", "value": 1},
 	"stringEnumRef": "B",
-	"intEnumRef": 3
+	"intEnumRef": 3,
+        "sumTypeRef": 10
   }
    `
 
diff --git a/backend/schema/normalise.go b/backend/schema/normalise.go
index 1676e407ac..b14b355847 100644
--- a/backend/schema/normalise.go
+++ b/backend/schema/normalise.go
@@ -134,6 +134,12 @@ func Normalise[T Node](n T) T {
 		c.Pos = zero
 		c.Type = Normalise(c.Type)
 
+	case *SumType:
+		c.Pos = zero
+		for i, v := range c.Variants {
+			c.Variants[i] = Normalise(v)
+		}
+
 	case Named, Symbol, Decl, Metadata, IngressPathComponent, Type, Value: // Can never occur in reality, but here to satisfy the sum-type check.
 		panic("??")
 	}
diff --git a/backend/schema/parser.go b/backend/schema/parser.go
index d8de7b5ad7..475abf6b17 100644
--- a/backend/schema/parser.go
+++ b/backend/schema/parser.go
@@ -12,7 +12,7 @@ import (
 )
 
 var (
-	declUnion            = []Decl{&Data{}, &Verb{}, &Database{}, &Enum{}, &Config{}, &Secret{}}
+	declUnion            = []Decl{&Data{}, &Verb{}, &Database{}, &Enum{}, &Config{}, &Secret{}, &SumType{}}
 	nonOptionalTypeUnion = []Type{
 		&Int{}, &Float{}, &String{}, &Bytes{}, &Bool{}, &Time{}, &Array{},
 		&Map{}, &Any{}, &Unit{},
@@ -40,7 +40,7 @@ var (
 		{Name: "Comment", Pattern: `//.*`},
 		{Name: "String", Pattern: `"(?:\\.|[^"])*"`},
 		{Name: "Number", Pattern: `[0-9]+(?:\.[0-9]+)?`},
-		{Name: "Punct", Pattern: `[%/\-\_:[\]{}<>()*+?.,\\^$|#~!\'@]`},
+		{Name: "Punct", Pattern: `[%/\-\_:[\]{}<>()*+?.,\\^$|#~!\'@=]`},
 	})
 
 	commonParserOptions = []participle.Option{
diff --git a/backend/schema/protobuf_dec.go b/backend/schema/protobuf_dec.go
index b989bfc251..96fc9e0049 100644
--- a/backend/schema/protobuf_dec.go
+++ b/backend/schema/protobuf_dec.go
@@ -33,6 +33,8 @@ func declListToSchema(s []*schemapb.Decl) []Decl {
 			out = append(out, ConfigFromProto(n.Config))
 		case *schemapb.Decl_Secret:
 			out = append(out, SecretFromProto(n.Secret))
+		case *schemapb.Decl_SumType:
+			out = append(out, SumTypeFromProto(n.SumType))
 		}
 	}
 	return out
diff --git a/backend/schema/protobuf_enc.go b/backend/schema/protobuf_enc.go
index 8a6d672ff8..9707479b3a 100644
--- a/backend/schema/protobuf_enc.go
+++ b/backend/schema/protobuf_enc.go
@@ -43,6 +43,9 @@ func declListToProto(nodes []Decl) []*schemapb.Decl {
 
 		case *Secret:
 			v = &schemapb.Decl_Secret{Secret: n.ToProto().(*schemapb.Secret)}
+
+		case *SumType:
+			v = &schemapb.Decl_SumType{SumType: n.ToProto().(*schemapb.SumType)}
 		}
 		out[i] = &schemapb.Decl{Value: v}
 	}
diff --git a/backend/schema/schema_test.go b/backend/schema/schema_test.go
index bf4db2aee0..65feb5fd61 100644
--- a/backend/schema/schema_test.go
+++ b/backend/schema/schema_test.go
@@ -24,6 +24,9 @@ module todo {
 
   database testdb
 
+  // SumType comment
+  sumtype IntOrBool = Int | Bool
+
   data CreateRequest {
     name {String: String}? +alias json "rqn"
   }
@@ -102,6 +105,9 @@ Module
   Secret
     String
   Database
+  SumType
+    Int
+    Bool
   Data
     Field
       Optional
@@ -378,6 +384,9 @@ module todo {
   secret secretValue String
   database testdb
 
+  // SumType comment
+  sumtype IntOrBool = Int | Bool
+
   data CreateRequest {
     name {String: String}? +alias json "rqn"
   }
@@ -435,6 +444,11 @@ var testSchema = MustValidate(&Schema{
 			Name:     "todo",
 			Comments: []string{"A comment"},
 			Decls: []Decl{
+				&SumType{
+					Comments: []string{"SumType comment"},
+					Name:     "IntOrBool",
+					Variants: []Type{&Int{}, &Bool{}},
+				},
 				&Secret{
 					Name: "secretValue",
 					Type: &String{},
diff --git a/backend/schema/sumtype.go b/backend/schema/sumtype.go
new file mode 100644
index 0000000000..aff2f60e4b
--- /dev/null
+++ b/backend/schema/sumtype.go
@@ -0,0 +1,67 @@
+package schema
+
+import (
+	"fmt"
+	"strings"
+
+	schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
+	"github.com/TBD54566975/ftl/internal/slices"
+	"google.golang.org/protobuf/proto"
+)
+
+type SumType struct {
+	Pos Position `parser:"" protobuf:"1,optional"`
+
+	Comments []string `parser:"@Comment*" protobuf:"2"`
+	Name     string   `parser:"'sumtype' @Ident '='" protobuf:"3"`
+	Variants []Type   `parser:"@@ ('|' @@)*" protobuf:"4"`
+}
+
+var _ Decl = (*SumType)(nil)
+var _ Symbol = (*SumType)(nil)
+
+func (s *SumType) Position() Position { return s.Pos }
+
+func (s *SumType) String() string {
+	w := &strings.Builder{}
+	fmt.Fprint(w, encodeComments(s.Comments))
+	typeNames := make([]string, len(s.Variants))
+	for i, v := range s.Variants {
+		typeNames[i] = v.String()
+	}
+	fmt.Fprintf(w, "sumtype %s = %s", s.Name, strings.Join(typeNames, " | "))
+	return w.String()
+}
+
+func (s *SumType) schemaDecl() {}
+func (*SumType) schemaSymbol() {}
+func (s *SumType) schemaChildren() []Node {
+	children := make([]Node, len(s.Variants))
+	for i, v := range s.Variants {
+		children[i] = v
+	}
+	return children
+}
+func (s *SumType) ToProto() proto.Message {
+	return &schemapb.SumType{
+		Pos:      posToProto(s.Pos),
+		Comments: s.Comments,
+		Name:     s.Name,
+		Variants: slices.Map(s.Variants, typeToProto),
+	}
+}
+
+func (s *SumType) GetName() string { return s.Name }
+
+func SumTypeFromProto(s *schemapb.SumType) *SumType {
+	variants := make([]Type, len(s.Variants))
+	for i, v := range s.Variants {
+		variants[i] = typeToSchema(v)
+	}
+	return &SumType{
+		Pos:      posFromProto(s.Pos),
+		Name:     s.Name,
+		Comments: s.Comments,
+		Variants: variants,
+	}
+}
diff --git a/backend/schema/validate.go b/backend/schema/validate.go
index ff27ddfeec..fbc0f17bde 100644
--- a/backend/schema/validate.go
+++ b/backend/schema/validate.go
@@ -176,7 +176,7 @@ func ValidateModuleInSchema(schema *Schema, m optional.Option[*Module]) (*Schema
 				*Int, *Map, Metadata, *MetadataCalls, *MetadataDatabases, *MetadataCronJob,
 				*MetadataIngress, *MetadataAlias, *Module, *Optional, *Schema,
 				*String, *Time, Type, *Unit, *Any, *TypeParameter, *EnumVariant,
-				Value, *IntValue, *StringValue, *Config, *Secret, Symbol, Named:
+				Value, *IntValue, *StringValue, *Config, *Secret, *SumType, Symbol, Named:
 			}
 			return next()
 		})
@@ -306,7 +306,7 @@ func ValidateModule(module *Module) error {
 			*Time, *Map, *Module, *Schema, *String, *Bytes,
 			*MetadataCalls, *MetadataDatabases, *MetadataIngress, *MetadataCronJob, *MetadataAlias,
 			IngressPathComponent, *IngressPathLiteral, *IngressPathParameter, *Optional,
-			*Unit, *Any, *TypeParameter, *Enum, *EnumVariant, *IntValue, *StringValue:
+			*Unit, *Any, *TypeParameter, *Enum, *EnumVariant, *IntValue, *StringValue, *SumType:
 
 		case Named, Symbol, Type, Metadata, Decl, Value: // Union types.
 		}
@@ -339,10 +339,12 @@ func getDeclSortingPriority(decl Decl) int {
 		priority = 3
 	case *Enum:
 		priority = 4
-	case *Data:
+	case *SumType:
 		priority = 5
-	case *Verb:
+	case *Data:
 		priority = 6
+	case *Verb:
+		priority = 7
 	}
 	return priority
 }
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 aedb38f332..a05866dc2c 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
@@ -371,6 +371,12 @@ export class Decl extends Message<Decl> {
      */
     value: Secret;
     case: "secret";
+  } | {
+    /**
+     * @generated from field: xyz.block.ftl.v1.schema.SumType sumType = 7;
+     */
+    value: SumType;
+    case: "sumType";
   } | { case: undefined; value?: undefined } = { case: undefined };
 
   constructor(data?: PartialMessage<Decl>) {
@@ -387,6 +393,7 @@ export class Decl extends Message<Decl> {
     { no: 4, name: "enum", kind: "message", T: Enum, oneof: "value" },
     { no: 5, name: "config", kind: "message", T: Config, oneof: "value" },
     { no: 6, name: "secret", kind: "message", T: Secret, oneof: "value" },
+    { no: 7, name: "sumType", kind: "message", T: SumType, oneof: "value" },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Decl {
@@ -1661,6 +1668,61 @@ export class StringValue extends Message<StringValue> {
   }
 }
 
+/**
+ * @generated from message xyz.block.ftl.v1.schema.SumType
+ */
+export class SumType extends Message<SumType> {
+  /**
+   * @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: repeated xyz.block.ftl.v1.schema.Type variants = 4;
+   */
+  variants: Type[] = [];
+
+  constructor(data?: PartialMessage<SumType>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "xyz.block.ftl.v1.schema.SumType";
+  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: "variants", kind: "message", T: Type, repeated: true },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): SumType {
+    return new SumType().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): SumType {
+    return new SumType().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): SumType {
+    return new SumType().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: SumType | PlainMessage<SumType> | undefined, b: SumType | PlainMessage<SumType> | undefined): boolean {
+    return proto3.util.equals(SumType, a, b);
+  }
+}
+
 /**
  * @generated from message xyz.block.ftl.v1.schema.Time
  */