diff --git a/backend/schema/jsonschema_test.go b/backend/schema/jsonschema_test.go
index 1528b00a2a..499c4bd0b3 100644
--- a/backend/schema/jsonschema_test.go
+++ b/backend/schema/jsonschema_test.go
@@ -18,7 +18,7 @@ var jsonSchemaSample = &Schema{
 					{Name: "string", Type: &String{}, Comments: []string{"Field comment"}},
 					{Name: "int", Type: &Int{}},
 					{Name: "float", Type: &Float{}},
-					{Name: "optional", Type: &Optional{&String{}}},
+					{Name: "optional", Type: &Optional{Type: &String{}}},
 					{Name: "bool", Type: &Bool{}},
 					{Name: "time", Type: &Time{}},
 					{Name: "array", Type: &Array{Element: &String{}}},
diff --git a/backend/schema/normalise.go b/backend/schema/normalise.go
index 8ba858f908..8700f6b3b9 100644
--- a/backend/schema/normalise.go
+++ b/backend/schema/normalise.go
@@ -1,6 +1,6 @@
 package schema
 
-// Normalise a Node.
+// Normalise normalises (zeroes) positional information in schema Nodes.
 func Normalise[T Node](n T) T {
 	var zero Position
 	var ni Node = n
diff --git a/backend/schema/protobuf_dec.go b/backend/schema/protobuf_dec.go
index fc6f059360..1140ac1674 100644
--- a/backend/schema/protobuf_dec.go
+++ b/backend/schema/protobuf_dec.go
@@ -32,9 +32,21 @@ func moduleListToSchema(s []*schemapb.Module) ([]*Module, error) {
 	return out, nil
 }
 
+func PosFromProto(pos *schemapb.Position) Position {
+	if pos == nil {
+		return Position{}
+	}
+	return Position{
+		Line:     int(pos.Line),
+		Column:   int(pos.Column),
+		Filename: pos.Filename,
+	}
+}
+
 // ModuleFromProto converts a protobuf Module to a Module and validates it.
 func ModuleFromProto(s *schemapb.Module) (*Module, error) {
 	module := &Module{
+		Pos:      PosFromProto(s.Pos),
 		Name:     s.Name,
 		Comments: s.Comments,
 		Decls:    declListToSchema(s.Decls),
@@ -73,6 +85,7 @@ func declListToSchema(s []*schemapb.Decl) []Decl {
 
 func VerbToSchema(s *schemapb.Verb) *Verb {
 	return &Verb{
+		Pos:      PosFromProto(s.Pos),
 		Name:     s.Name,
 		Comments: s.Comments,
 		Request:  dataRefToSchema(s.Request),
@@ -83,6 +96,7 @@ func VerbToSchema(s *schemapb.Verb) *Verb {
 
 func DataToSchema(s *schemapb.Data) *Data {
 	return &Data{
+		Pos:      PosFromProto(s.Pos),
 		Name:     s.Name,
 		Fields:   fieldListToSchema(s.Fields),
 		Comments: s.Comments,
@@ -99,6 +113,7 @@ func fieldListToSchema(s []*schemapb.Field) []*Field {
 
 func fieldToSchema(s *schemapb.Field) *Field {
 	return &Field{
+		Pos:      PosFromProto(s.Pos),
 		Name:     s.Name,
 		Comments: s.Comments,
 		Type:     typeToSchema(s.Type),
@@ -112,27 +127,28 @@ func typeToSchema(s *schemapb.Type) Type {
 	case *schemapb.Type_DataRef:
 		return dataRefToSchema(s.DataRef)
 	case *schemapb.Type_Int:
-		return &Int{}
+		return &Int{Pos: PosFromProto(s.Int.Pos)}
 	case *schemapb.Type_Float:
-		return &Float{}
+		return &Float{Pos: PosFromProto(s.Float.Pos)}
 	case *schemapb.Type_String_:
-		return &String{}
+		return &String{Pos: PosFromProto(s.String_.Pos)}
 	case *schemapb.Type_Time:
-		return &Time{}
+		return &Time{Pos: PosFromProto(s.Time.Pos)}
 	case *schemapb.Type_Bool:
-		return &Bool{}
+		return &Bool{Pos: PosFromProto(s.Bool.Pos)}
 	case *schemapb.Type_Array:
 		return arrayToSchema(s.Array)
 	case *schemapb.Type_Map:
 		return mapToSchema(s.Map)
 	case *schemapb.Type_Optional:
-		return &Optional{Type: typeToSchema(s.Optional.Type)}
+		return &Optional{Pos: PosFromProto(s.Optional.Pos), Type: typeToSchema(s.Optional.Type)}
 	}
 	panic("unreachable")
 }
 
 func verbRefToSchema(s *schemapb.VerbRef) *VerbRef {
 	return &VerbRef{
+		Pos:    PosFromProto(s.Pos),
 		Name:   s.Name,
 		Module: s.Module,
 	}
@@ -140,6 +156,7 @@ func verbRefToSchema(s *schemapb.VerbRef) *VerbRef {
 
 func dataRefToSchema(s *schemapb.DataRef) *DataRef {
 	return &DataRef{
+		Pos:    PosFromProto(s.Pos),
 		Name:   s.Name,
 		Module: s.Module,
 	}
@@ -147,12 +164,14 @@ func dataRefToSchema(s *schemapb.DataRef) *DataRef {
 
 func arrayToSchema(s *schemapb.Array) *Array {
 	return &Array{
+		Pos:     PosFromProto(s.Pos),
 		Element: typeToSchema(s.Element),
 	}
 }
 
 func mapToSchema(s *schemapb.Map) *Map {
 	return &Map{
+		Pos:   PosFromProto(s.Pos),
 		Key:   typeToSchema(s.Key),
 		Value: typeToSchema(s.Value),
 	}
@@ -170,11 +189,13 @@ func metadataToSchema(s *schemapb.Metadata) Metadata {
 	switch s := s.Value.(type) {
 	case *schemapb.Metadata_Calls:
 		return &MetadataCalls{
+			Pos:   PosFromProto(s.Calls.Pos),
 			Calls: verbRefListToSchema(s.Calls.Calls),
 		}
 
 	case *schemapb.Metadata_Ingress:
 		return &MetadataIngress{
+			Pos:    PosFromProto(s.Ingress.Pos),
 			Method: s.Ingress.Method,
 			Path:   s.Ingress.Path,
 		}
diff --git a/backend/schema/protobuf_test.go b/backend/schema/protobuf_test.go
index 7e00ef8efa..7bfaa45ff4 100644
--- a/backend/schema/protobuf_test.go
+++ b/backend/schema/protobuf_test.go
@@ -3,8 +3,9 @@ package schema
 import (
 	"testing"
 
-	schemapb "github.com/TBD54566975/ftl/protos/xyz/block/ftl/v1/schema"
 	"github.com/alecthomas/assert/v2"
+
+	schemapb "github.com/TBD54566975/ftl/protos/xyz/block/ftl/v1/schema"
 )
 
 func TestProtoRoundtrip(t *testing.T) {
diff --git a/backend/schema/schema.go b/backend/schema/schema.go
index 96ecc4263d..abe1c84658 100644
--- a/backend/schema/schema.go
+++ b/backend/schema/schema.go
@@ -61,50 +61,52 @@ type Type interface {
 
 // Optional represents a Type whose value may be optional.
 type Optional struct {
-	Type Type `parser:"@@" protobuf:"1"`
+	Pos Position `parser:"" protobuf:"1,optional"`
+
+	Type Type `parser:"@@" protobuf:"2,optional"`
 }
 
 type Int struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
 	Int bool `parser:"@'Int'" protobuf:"-"`
 }
 
 type Float struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
 	Float bool `parser:"@'Float'" protobuf:"-"`
 }
 
 type String struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
 	Str bool `parser:"@'String'" protobuf:"-"`
 }
 
 type Bool struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
 	Bool bool `parser:"@'Bool'" protobuf:"-"`
 }
 
 type Time struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
 	Time bool `parser:"@'Time'" protobuf:"-"`
 }
 
 type Array struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
-	Element Type `parser:"'[' @@ ']'" protobuf:"1"`
+	Element Type `parser:"'[' @@ ']'" protobuf:"2"`
 }
 
 type Map struct {
-	Pos Position `parser:"" protobuf:"-"`
+	Pos Position `parser:"" protobuf:"1,optional"`
 
-	Key   Type `parser:"'{' @@" protobuf:"1"`
-	Value Type `parser:"':' @@ '}'" protobuf:"2"`
+	Key   Type `parser:"'{' @@" protobuf:"2"`
+	Value Type `parser:"':' @@ '}'" protobuf:"3"`
 }
 
 type Field struct {
diff --git a/backend/schema/validate.go b/backend/schema/validate.go
index b6860acedc..3514aab6c8 100644
--- a/backend/schema/validate.go
+++ b/backend/schema/validate.go
@@ -14,7 +14,7 @@ var (
 	}
 )
 
-// Validate performs semantic validation of a schema.
+// Validate normalises and performs semantic validation of a schema.
 func Validate(schema *Schema) error {
 	modules := map[string]bool{}
 	verbs := map[string]bool{}
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 8c15e885fa..6c6f835f22 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
@@ -14,7 +14,12 @@ import { ModuleRuntime, VerbRuntime } from "./runtime_pb.js";
  */
 export class Array extends Message<Array> {
   /**
-   * @generated from field: xyz.block.ftl.v1.schema.Type element = 1;
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: xyz.block.ftl.v1.schema.Type element = 2;
    */
   element?: Type;
 
@@ -26,7 +31,8 @@ export class Array extends Message<Array> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Array";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
-    { no: 1, name: "element", kind: "message", T: Type },
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "element", kind: "message", T: Type },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Array {
@@ -50,6 +56,11 @@ export class Array extends Message<Array> {
  * @generated from message xyz.block.ftl.v1.schema.Bool
  */
 export class Bool extends Message<Bool> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
   constructor(data?: PartialMessage<Bool>) {
     super();
     proto3.util.initPartial(data, this);
@@ -58,6 +69,7 @@ export class Bool extends Message<Bool> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Bool";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Bool {
@@ -296,6 +308,11 @@ export class Field extends Message<Field> {
  * @generated from message xyz.block.ftl.v1.schema.Float
  */
 export class Float extends Message<Float> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
   constructor(data?: PartialMessage<Float>) {
     super();
     proto3.util.initPartial(data, this);
@@ -304,6 +321,7 @@ export class Float extends Message<Float> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Float";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Float {
@@ -327,6 +345,11 @@ export class Float extends Message<Float> {
  * @generated from message xyz.block.ftl.v1.schema.Int
  */
 export class Int extends Message<Int> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
   constructor(data?: PartialMessage<Int>) {
     super();
     proto3.util.initPartial(data, this);
@@ -335,6 +358,7 @@ export class Int extends Message<Int> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Int";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Int {
@@ -359,12 +383,17 @@ export class Int extends Message<Int> {
  */
 export class Map extends Message<Map> {
   /**
-   * @generated from field: xyz.block.ftl.v1.schema.Type key = 1;
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: xyz.block.ftl.v1.schema.Type key = 2;
    */
   key?: Type;
 
   /**
-   * @generated from field: xyz.block.ftl.v1.schema.Type value = 2;
+   * @generated from field: xyz.block.ftl.v1.schema.Type value = 3;
    */
   value?: Type;
 
@@ -376,8 +405,9 @@ export class Map extends Message<Map> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Map";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
-    { no: 1, name: "key", kind: "message", T: Type },
-    { no: 2, name: "value", kind: "message", T: Type },
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "key", kind: "message", T: Type },
+    { no: 3, name: "value", kind: "message", T: Type },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Map {
@@ -605,7 +635,12 @@ export class Module extends Message<Module> {
  */
 export class Optional extends Message<Optional> {
   /**
-   * @generated from field: xyz.block.ftl.v1.schema.Type type = 1;
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Type type = 2;
    */
   type?: Type;
 
@@ -617,7 +652,8 @@ export class Optional extends Message<Optional> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Optional";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
-    { no: 1, name: "type", kind: "message", T: Type },
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
+    { no: 2, name: "type", kind: "message", T: Type, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Optional {
@@ -733,6 +769,11 @@ export class Schema extends Message<Schema> {
  * @generated from message xyz.block.ftl.v1.schema.String
  */
 export class String extends Message<String> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
   constructor(data?: PartialMessage<String>) {
     super();
     proto3.util.initPartial(data, this);
@@ -741,6 +782,7 @@ export class String extends Message<String> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.String";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): String {
@@ -764,6 +806,11 @@ export class String extends Message<String> {
  * @generated from message xyz.block.ftl.v1.schema.Time
  */
 export class Time extends Message<Time> {
+  /**
+   * @generated from field: optional xyz.block.ftl.v1.schema.Position pos = 1;
+   */
+  pos?: Position;
+
   constructor(data?: PartialMessage<Time>) {
     super();
     proto3.util.initPartial(data, this);
@@ -772,6 +819,7 @@ export class Time extends Message<Time> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.schema.Time";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "pos", kind: "message", T: Position, opt: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Time {
diff --git a/go-runtime/compile/schema.go b/go-runtime/compile/schema.go
index 59324175f0..b3b6b4fed4 100644
--- a/go-runtime/compile/schema.go
+++ b/go-runtime/compile/schema.go
@@ -273,7 +273,11 @@ func parseStruct(pctx *parseContext, node ast.Node, tnode types.Type) (*schema.D
 	if !strings.HasPrefix(nodePath, pctx.pkg.PkgPath) {
 		base := path.Dir(pctx.pkg.PkgPath)
 		destModule := path.Base(strings.TrimPrefix(nodePath, base+"/"))
-		return &schema.DataRef{Module: destModule, Name: named.Obj().Name()}, nil
+		return &schema.DataRef{
+			Pos:    goPosToSchemaPos(node.Pos()),
+			Module: destModule,
+			Name:   named.Obj().Name(),
+		}, nil
 	}
 	out := &schema.Data{
 		Pos:  goPosToSchemaPos(node.Pos()),
diff --git a/protos/xyz/block/ftl/v1/schema/schema.pb.go b/protos/xyz/block/ftl/v1/schema/schema.pb.go
index aa457899bf..08a2e99007 100644
--- a/protos/xyz/block/ftl/v1/schema/schema.pb.go
+++ b/protos/xyz/block/ftl/v1/schema/schema.pb.go
@@ -27,7 +27,8 @@ type Array struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Element *Type `protobuf:"bytes,1,opt,name=element,proto3" json:"element,omitempty"`
+	Pos     *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Element *Type     `protobuf:"bytes,2,opt,name=element,proto3" json:"element,omitempty"`
 }
 
 func (x *Array) Reset() {
@@ -62,6 +63,13 @@ func (*Array) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{0}
 }
 
+func (x *Array) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 func (x *Array) GetElement() *Type {
 	if x != nil {
 		return x.Element
@@ -73,6 +81,8 @@ type Bool struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Pos *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
 }
 
 func (x *Bool) Reset() {
@@ -107,6 +117,13 @@ func (*Bool) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{1}
 }
 
+func (x *Bool) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 type Data struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -405,6 +422,8 @@ type Float struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Pos *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
 }
 
 func (x *Float) Reset() {
@@ -439,10 +458,19 @@ func (*Float) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{6}
 }
 
+func (x *Float) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 type Int struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Pos *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
 }
 
 func (x *Int) Reset() {
@@ -477,13 +505,21 @@ func (*Int) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{7}
 }
 
+func (x *Int) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 type Map struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Key   *Type `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
-	Value *Type `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	Pos   *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Key   *Type     `protobuf:"bytes,2,opt,name=key,proto3" json:"key,omitempty"`
+	Value *Type     `protobuf:"bytes,3,opt,name=value,proto3" json:"value,omitempty"`
 }
 
 func (x *Map) Reset() {
@@ -518,6 +554,13 @@ func (*Map) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{8}
 }
 
+func (x *Map) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 func (x *Map) GetKey() *Type {
 	if x != nil {
 		return x.Key
@@ -815,7 +858,8 @@ type Optional struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type *Type `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	Pos  *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
+	Type *Type     `protobuf:"bytes,2,opt,name=type,proto3,oneof" json:"type,omitempty"`
 }
 
 func (x *Optional) Reset() {
@@ -850,6 +894,13 @@ func (*Optional) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{13}
 }
 
+func (x *Optional) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 func (x *Optional) GetType() *Type {
 	if x != nil {
 		return x.Type
@@ -979,6 +1030,8 @@ type String struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Pos *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
 }
 
 func (x *String) Reset() {
@@ -1013,10 +1066,19 @@ func (*String) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{16}
 }
 
+func (x *String) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 type Time struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	Pos *Position `protobuf:"bytes,1,opt,name=pos,proto3,oneof" json:"pos,omitempty"`
 }
 
 func (x *Time) Reset() {
@@ -1051,6 +1113,13 @@ func (*Time) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_schema_schema_proto_rawDescGZIP(), []int{17}
 }
 
+func (x *Time) GetPos() *Position {
+	if x != nil {
+		return x.Pos
+	}
+	return nil
+}
+
 type Type struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
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 var (
@@ -1642,49 +1745,57 @@ var file_xyz_block_ftl_v1_schema_schema_proto_goTypes = []interface{}{
 	(*VerbRuntime)(nil),     // 22: xyz.block.ftl.v1.schema.VerbRuntime
 }
 var file_xyz_block_ftl_v1_schema_schema_proto_depIdxs = []int32{
-	18, // 0: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
-	14, // 1: xyz.block.ftl.v1.schema.Data.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	5,  // 2: xyz.block.ftl.v1.schema.Data.fields:type_name -> xyz.block.ftl.v1.schema.Field
-	9,  // 3: xyz.block.ftl.v1.schema.Data.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	14, // 4: xyz.block.ftl.v1.schema.DataRef.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	2,  // 5: xyz.block.ftl.v1.schema.Decl.data:type_name -> xyz.block.ftl.v1.schema.Data
-	19, // 6: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
-	14, // 7: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	18, // 8: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
-	18, // 9: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
-	18, // 10: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
-	10, // 11: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
-	11, // 12: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
-	14, // 13: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	20, // 14: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.VerbRef
-	14, // 15: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	21, // 16: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
-	14, // 17: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	4,  // 18: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
-	18, // 19: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
-	14, // 20: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	12, // 21: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
-	7,  // 22: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
-	6,  // 23: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
-	16, // 24: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
-	1,  // 25: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
-	17, // 26: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
-	0,  // 27: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
-	8,  // 28: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
-	20, // 29: xyz.block.ftl.v1.schema.Type.verbRef:type_name -> xyz.block.ftl.v1.schema.VerbRef
-	3,  // 30: xyz.block.ftl.v1.schema.Type.dataRef:type_name -> xyz.block.ftl.v1.schema.DataRef
-	13, // 31: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
-	22, // 32: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
-	14, // 33: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	3,  // 34: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.DataRef
-	3,  // 35: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.DataRef
-	9,  // 36: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	14, // 37: xyz.block.ftl.v1.schema.VerbRef.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	38, // [38:38] is the sub-list for method output_type
-	38, // [38:38] is the sub-list for method input_type
-	38, // [38:38] is the sub-list for extension type_name
-	38, // [38:38] is the sub-list for extension extendee
-	0,  // [0:38] is the sub-list for field type_name
+	14, // 0: xyz.block.ftl.v1.schema.Array.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	18, // 1: xyz.block.ftl.v1.schema.Array.element:type_name -> xyz.block.ftl.v1.schema.Type
+	14, // 2: xyz.block.ftl.v1.schema.Bool.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	14, // 3: xyz.block.ftl.v1.schema.Data.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	5,  // 4: xyz.block.ftl.v1.schema.Data.fields:type_name -> xyz.block.ftl.v1.schema.Field
+	9,  // 5: xyz.block.ftl.v1.schema.Data.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	14, // 6: xyz.block.ftl.v1.schema.DataRef.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	2,  // 7: xyz.block.ftl.v1.schema.Decl.data:type_name -> xyz.block.ftl.v1.schema.Data
+	19, // 8: xyz.block.ftl.v1.schema.Decl.verb:type_name -> xyz.block.ftl.v1.schema.Verb
+	14, // 9: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	18, // 10: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
+	14, // 11: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	14, // 12: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	14, // 13: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	18, // 14: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
+	18, // 15: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
+	10, // 16: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
+	11, // 17: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
+	14, // 18: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	20, // 19: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.VerbRef
+	14, // 20: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	21, // 21: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
+	14, // 22: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	4,  // 23: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
+	14, // 24: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	18, // 25: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
+	14, // 26: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	12, // 27: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
+	14, // 28: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	14, // 29: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	7,  // 30: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
+	6,  // 31: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
+	16, // 32: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
+	1,  // 33: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
+	17, // 34: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
+	0,  // 35: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
+	8,  // 36: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
+	20, // 37: xyz.block.ftl.v1.schema.Type.verbRef:type_name -> xyz.block.ftl.v1.schema.VerbRef
+	3,  // 38: xyz.block.ftl.v1.schema.Type.dataRef:type_name -> xyz.block.ftl.v1.schema.DataRef
+	13, // 39: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
+	22, // 40: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
+	14, // 41: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	3,  // 42: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.DataRef
+	3,  // 43: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.DataRef
+	9,  // 44: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
+	14, // 45: xyz.block.ftl.v1.schema.VerbRef.pos:type_name -> xyz.block.ftl.v1.schema.Position
+	46, // [46:46] is the sub-list for method output_type
+	46, // [46:46] is the sub-list for method input_type
+	46, // [46:46] is the sub-list for extension type_name
+	46, // [46:46] is the sub-list for extension extendee
+	0,  // [0:46] is the sub-list for field type_name
 }
 
 func init() { file_xyz_block_ftl_v1_schema_schema_proto_init() }
@@ -1947,6 +2058,8 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 			}
 		}
 	}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[0].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[1].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[2].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[3].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[4].OneofWrappers = []interface{}{
@@ -1954,6 +2067,9 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 		(*Decl_Verb)(nil),
 	}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[5].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[6].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[7].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[8].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[9].OneofWrappers = []interface{}{
 		(*Metadata_Calls)(nil),
 		(*Metadata_Ingress)(nil),
@@ -1961,7 +2077,10 @@ func file_xyz_block_ftl_v1_schema_schema_proto_init() {
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[10].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[11].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[12].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[13].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[15].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[16].OneofWrappers = []interface{}{}
+	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[17].OneofWrappers = []interface{}{}
 	file_xyz_block_ftl_v1_schema_schema_proto_msgTypes[18].OneofWrappers = []interface{}{
 		(*Type_Int)(nil),
 		(*Type_Float)(nil),
diff --git a/protos/xyz/block/ftl/v1/schema/schema.proto b/protos/xyz/block/ftl/v1/schema/schema.proto
index b4f0902a24..860084362a 100644
--- a/protos/xyz/block/ftl/v1/schema/schema.proto
+++ b/protos/xyz/block/ftl/v1/schema/schema.proto
@@ -9,10 +9,13 @@ option go_package = "github.com/TBD54566975/ftl/protos/xyz/block/ftl/v1/schema;s
 option java_multiple_files = true;
 
 message Array {
-  Type element = 1;
+  optional Position pos = 1;
+  Type element = 2;
 }
 
-message Bool {}
+message Bool {
+  optional Position pos = 1;
+}
 
 message Data {
   optional Position pos = 1;
@@ -42,13 +45,18 @@ message Field {
   Type type = 4;
 }
 
-message Float {}
+message Float {
+  optional Position pos = 1;
+}
 
-message Int {}
+message Int {
+  optional Position pos = 1;
+}
 
 message Map {
-  Type key = 1;
-  Type value = 2;
+  optional Position pos = 1;
+  Type key = 2;
+  Type value = 3;
 }
 
 message Metadata {
@@ -79,7 +87,8 @@ message Module {
 }
 
 message Optional {
-  Type type = 1;
+  optional Position pos = 1;
+  optional Type type = 2;
 }
 
 message Position {
@@ -93,9 +102,13 @@ message Schema {
   repeated Module modules = 2;
 }
 
-message String {}
+message String {
+  optional Position pos = 1;
+}
 
-message Time {}
+message Time {
+  optional Position pos = 1;
+}
 
 message Type {
   oneof value {