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 7402c465c7..0a5a892361 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.pb.go
@@ -955,6 +955,7 @@ type FSM struct {
 	Name        string           `protobuf:"bytes,3,opt,name=name,proto3" json:"name,omitempty"`
 	Start       []*Ref           `protobuf:"bytes,4,rep,name=start,proto3" json:"start,omitempty"`
 	Transitions []*FSMTransition `protobuf:"bytes,5,rep,name=transitions,proto3" json:"transitions,omitempty"`
+	Metadata    []*Metadata      `protobuf:"bytes,6,rep,name=metadata,proto3" json:"metadata,omitempty"`
 }
 
 func (x *FSM) Reset() {
@@ -1024,6 +1025,13 @@ func (x *FSM) GetTransitions() []*FSMTransition {
 	return nil
 }
 
+func (x *FSM) GetMetadata() []*Metadata {
+	if x != nil {
+		return x.Metadata
+	}
+	return nil
+}
+
 type FSMTransition struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3440,7 +3448,7 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
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@@ -3455,371 +3463,375 @@ var file_xyz_block_ftl_v1_schema_schema_proto_rawDesc = []byte{
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 }
 
 var (
@@ -3918,82 +3930,83 @@ var file_xyz_block_ftl_v1_schema_schema_proto_depIdxs = []int32{
 	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
-	32,  // 31: xyz.block.ftl.v1.schema.FSMTransition.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 32: xyz.block.ftl.v1.schema.FSMTransition.from:type_name -> xyz.block.ftl.v1.schema.Ref
-	33,  // 33: xyz.block.ftl.v1.schema.FSMTransition.to:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 34: xyz.block.ftl.v1.schema.Field.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 35: xyz.block.ftl.v1.schema.Field.type:type_name -> xyz.block.ftl.v1.schema.Type
-	23,  // 36: xyz.block.ftl.v1.schema.Field.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	32,  // 37: xyz.block.ftl.v1.schema.Float.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	18,  // 38: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathLiteral:type_name -> xyz.block.ftl.v1.schema.IngressPathLiteral
-	19,  // 39: xyz.block.ftl.v1.schema.IngressPathComponent.ingressPathParameter:type_name -> xyz.block.ftl.v1.schema.IngressPathParameter
-	32,  // 40: xyz.block.ftl.v1.schema.IngressPathLiteral.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 41: xyz.block.ftl.v1.schema.IngressPathParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 42: xyz.block.ftl.v1.schema.Int.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 43: xyz.block.ftl.v1.schema.IntValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 44: xyz.block.ftl.v1.schema.Map.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 45: xyz.block.ftl.v1.schema.Map.key:type_name -> xyz.block.ftl.v1.schema.Type
-	39,  // 46: xyz.block.ftl.v1.schema.Map.value:type_name -> xyz.block.ftl.v1.schema.Type
-	25,  // 47: xyz.block.ftl.v1.schema.Metadata.calls:type_name -> xyz.block.ftl.v1.schema.MetadataCalls
-	28,  // 48: xyz.block.ftl.v1.schema.Metadata.ingress:type_name -> xyz.block.ftl.v1.schema.MetadataIngress
-	26,  // 49: xyz.block.ftl.v1.schema.Metadata.cronJob:type_name -> xyz.block.ftl.v1.schema.MetadataCronJob
-	27,  // 50: xyz.block.ftl.v1.schema.Metadata.databases:type_name -> xyz.block.ftl.v1.schema.MetadataDatabases
-	24,  // 51: xyz.block.ftl.v1.schema.Metadata.alias:type_name -> xyz.block.ftl.v1.schema.MetadataAlias
-	29,  // 52: xyz.block.ftl.v1.schema.Metadata.retry:type_name -> xyz.block.ftl.v1.schema.MetadataRetry
-	32,  // 53: xyz.block.ftl.v1.schema.MetadataAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 54: xyz.block.ftl.v1.schema.MetadataCalls.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 55: xyz.block.ftl.v1.schema.MetadataCalls.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 56: xyz.block.ftl.v1.schema.MetadataCronJob.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 57: xyz.block.ftl.v1.schema.MetadataDatabases.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	33,  // 58: xyz.block.ftl.v1.schema.MetadataDatabases.calls:type_name -> xyz.block.ftl.v1.schema.Ref
-	32,  // 59: xyz.block.ftl.v1.schema.MetadataIngress.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	17,  // 60: xyz.block.ftl.v1.schema.MetadataIngress.path:type_name -> xyz.block.ftl.v1.schema.IngressPathComponent
-	32,  // 61: xyz.block.ftl.v1.schema.MetadataRetry.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	46,  // 62: xyz.block.ftl.v1.schema.Module.runtime:type_name -> xyz.block.ftl.v1.schema.ModuleRuntime
-	32,  // 63: xyz.block.ftl.v1.schema.Module.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	8,   // 64: xyz.block.ftl.v1.schema.Module.decls:type_name -> xyz.block.ftl.v1.schema.Decl
-	32,  // 65: xyz.block.ftl.v1.schema.Optional.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 66: xyz.block.ftl.v1.schema.Optional.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 67: xyz.block.ftl.v1.schema.Ref.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 68: xyz.block.ftl.v1.schema.Ref.typeParameters:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 69: xyz.block.ftl.v1.schema.Schema.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	30,  // 70: xyz.block.ftl.v1.schema.Schema.modules:type_name -> xyz.block.ftl.v1.schema.Module
-	32,  // 71: xyz.block.ftl.v1.schema.Secret.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 72: xyz.block.ftl.v1.schema.Secret.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 73: xyz.block.ftl.v1.schema.String.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 74: xyz.block.ftl.v1.schema.StringValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 75: xyz.block.ftl.v1.schema.Time.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	20,  // 76: xyz.block.ftl.v1.schema.Type.int:type_name -> xyz.block.ftl.v1.schema.Int
-	16,  // 77: xyz.block.ftl.v1.schema.Type.float:type_name -> xyz.block.ftl.v1.schema.Float
-	36,  // 78: xyz.block.ftl.v1.schema.Type.string:type_name -> xyz.block.ftl.v1.schema.String
-	4,   // 79: xyz.block.ftl.v1.schema.Type.bytes:type_name -> xyz.block.ftl.v1.schema.Bytes
-	3,   // 80: xyz.block.ftl.v1.schema.Type.bool:type_name -> xyz.block.ftl.v1.schema.Bool
-	38,  // 81: xyz.block.ftl.v1.schema.Type.time:type_name -> xyz.block.ftl.v1.schema.Time
-	2,   // 82: xyz.block.ftl.v1.schema.Type.array:type_name -> xyz.block.ftl.v1.schema.Array
-	22,  // 83: xyz.block.ftl.v1.schema.Type.map:type_name -> xyz.block.ftl.v1.schema.Map
-	1,   // 84: xyz.block.ftl.v1.schema.Type.any:type_name -> xyz.block.ftl.v1.schema.Any
-	43,  // 85: xyz.block.ftl.v1.schema.Type.unit:type_name -> xyz.block.ftl.v1.schema.Unit
-	33,  // 86: xyz.block.ftl.v1.schema.Type.ref:type_name -> xyz.block.ftl.v1.schema.Ref
-	31,  // 87: xyz.block.ftl.v1.schema.Type.optional:type_name -> xyz.block.ftl.v1.schema.Optional
-	32,  // 88: xyz.block.ftl.v1.schema.TypeAlias.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 89: xyz.block.ftl.v1.schema.TypeAlias.type:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 90: xyz.block.ftl.v1.schema.TypeParameter.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	32,  // 91: xyz.block.ftl.v1.schema.TypeValue.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 92: xyz.block.ftl.v1.schema.TypeValue.value:type_name -> xyz.block.ftl.v1.schema.Type
-	32,  // 93: xyz.block.ftl.v1.schema.Unit.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	37,  // 94: xyz.block.ftl.v1.schema.Value.stringValue:type_name -> xyz.block.ftl.v1.schema.StringValue
-	21,  // 95: xyz.block.ftl.v1.schema.Value.intValue:type_name -> xyz.block.ftl.v1.schema.IntValue
-	42,  // 96: xyz.block.ftl.v1.schema.Value.typeValue:type_name -> xyz.block.ftl.v1.schema.TypeValue
-	47,  // 97: xyz.block.ftl.v1.schema.Verb.runtime:type_name -> xyz.block.ftl.v1.schema.VerbRuntime
-	32,  // 98: xyz.block.ftl.v1.schema.Verb.pos:type_name -> xyz.block.ftl.v1.schema.Position
-	39,  // 99: xyz.block.ftl.v1.schema.Verb.request:type_name -> xyz.block.ftl.v1.schema.Type
-	39,  // 100: xyz.block.ftl.v1.schema.Verb.response:type_name -> xyz.block.ftl.v1.schema.Type
-	23,  // 101: xyz.block.ftl.v1.schema.Verb.metadata:type_name -> xyz.block.ftl.v1.schema.Metadata
-	102, // [102:102] is the sub-list for method output_type
-	102, // [102:102] is the sub-list for method input_type
-	102, // [102:102] is the sub-list for extension type_name
-	102, // [102:102] is the sub-list for extension extendee
-	0,   // [0:102] is the sub-list for field type_name
+	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
 }
 
 func init() { file_xyz_block_ftl_v1_schema_schema_proto_init() }
diff --git a/backend/protos/xyz/block/ftl/v1/schema/schema.proto b/backend/protos/xyz/block/ftl/v1/schema/schema.proto
index 5eea708a2f..365d4eb7b4 100644
--- a/backend/protos/xyz/block/ftl/v1/schema/schema.proto
+++ b/backend/protos/xyz/block/ftl/v1/schema/schema.proto
@@ -101,6 +101,7 @@ message FSM {
   string name = 3;
   repeated Ref start = 4;
   repeated FSMTransition transitions = 5;
+  repeated Metadata metadata = 6;
 }
 
 message FSMTransition {
diff --git a/backend/schema/fsm.go b/backend/schema/fsm.go
index 223d7d907e..63b75a9998 100644
--- a/backend/schema/fsm.go
+++ b/backend/schema/fsm.go
@@ -18,6 +18,7 @@ type FSM struct {
 	Name        string           `parser:"'fsm' @Ident '{'" protobuf:"3"`
 	Start       []*Ref           `parser:"('start' @@)*" protobuf:"4"` // Start states.
 	Transitions []*FSMTransition `parser:"('transition' @@)* '}'" protobuf:"5"`
+	Metadata    []Metadata       `parser:"@@*" protobuf:"6"`
 }
 
 func FSMFromProto(pb *schemapb.FSM) *FSM {
@@ -26,6 +27,7 @@ func FSMFromProto(pb *schemapb.FSM) *FSM {
 		Name:        pb.Name,
 		Start:       slices.Map(pb.Start, RefFromProto),
 		Transitions: slices.Map(pb.Transitions, FSMTransitionFromProto),
+		Metadata:    metadataListToSchema(pb.Metadata),
 	}
 }
 
@@ -62,7 +64,13 @@ func (f *FSM) schemaSymbol()      {}
 
 func (f *FSM) String() string {
 	w := &strings.Builder{}
-	fmt.Fprintf(w, "fsm %s {\n", f.Name)
+	if len(f.Metadata) == 0 {
+		fmt.Fprintf(w, "fsm %s {\n", f.Name)
+	} else {
+		fmt.Fprintf(w, "fsm %s", f.Name)
+		fmt.Fprint(w, indent(encodeMetadata(f.Metadata)))
+		fmt.Fprintf(w, "\n{\n")
+	}
 	for _, s := range f.Start {
 		fmt.Fprintf(w, "  start %s\n", s)
 	}
@@ -83,6 +91,7 @@ func (f *FSM) ToProto() protoreflect.ProtoMessage {
 		Transitions: slices.Map(f.Transitions, func(t *FSMTransition) *schemapb.FSMTransition {
 			return t.ToProto().(*schemapb.FSMTransition) //nolint: forcetypeassert
 		}),
+		Metadata: metadataListToProto(f.Metadata),
 	}
 }
 
@@ -94,6 +103,9 @@ func (f *FSM) schemaChildren() []Node {
 	for _, t := range f.Transitions {
 		out = append(out, t)
 	}
+	for _, m := range f.Metadata {
+		out = append(out, m)
+	}
 	return out
 }
 
diff --git a/backend/schema/protobuf_dec.go b/backend/schema/protobuf_dec.go
index 9093403337..04ed761fe3 100644
--- a/backend/schema/protobuf_dec.go
+++ b/backend/schema/protobuf_dec.go
@@ -136,6 +136,19 @@ func metadataToSchema(s *schemapb.Metadata) Metadata {
 			Alias: s.Alias.Alias,
 		}
 
+	case *schemapb.Metadata_Retry:
+		var count *int
+		if s.Retry.Count != nil {
+			countValue := int(*s.Retry.Count)
+			count = &countValue
+		}
+		return &MetadataRetry{
+			Pos:        posFromProto(s.Retry.Pos),
+			Count:      count,
+			MinBackoff: s.Retry.MinBackoff,
+			MaxBackoff: s.Retry.MaxBackoff,
+		}
+
 	default:
 		panic(fmt.Sprintf("unhandled metadata type: %T", s))
 	}
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 2004501881..e641c70a47 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
@@ -707,6 +707,11 @@ export class FSM extends Message<FSM> {
    */
   transitions: FSMTransition[] = [];
 
+  /**
+   * @generated from field: repeated xyz.block.ftl.v1.schema.Metadata metadata = 6;
+   */
+  metadata: Metadata[] = [];
+
   constructor(data?: PartialMessage<FSM>) {
     super();
     proto3.util.initPartial(data, this);
@@ -720,6 +725,7 @@ export class FSM extends Message<FSM> {
     { no: 3, name: "name", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 4, name: "start", kind: "message", T: Ref, repeated: true },
     { no: 5, name: "transitions", kind: "message", T: FSMTransition, repeated: true },
+    { no: 6, name: "metadata", kind: "message", T: Metadata, repeated: true },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): FSM {
diff --git a/go-runtime/compile/schema.go b/go-runtime/compile/schema.go
index baab4362a9..e6fbf78eb6 100644
--- a/go-runtime/compile/schema.go
+++ b/go-runtime/compile/schema.go
@@ -143,23 +143,17 @@ func ExtractModuleSchema(dir string, sch *schema.Schema) (optional.Option[ParseR
 			return optional.None[ParseResult](), err
 		}
 		for _, file := range pkg.Syntax {
-			err := goast.Visit(file, func(node ast.Node, next func() error) (err error) {
+			err := goast.Visit(file, func(stack []ast.Node, next func() error) (err error) {
+				node := stack[len(stack)-1]
 				switch node := node.(type) {
 				case *ast.CallExpr:
-					visitCallExpr(pctx, node)
+					visitCallExpr(pctx, node, stack)
 
 				case *ast.File:
 					visitFile(pctx, node)
 
 				case *ast.FuncDecl:
-					verb := visitFuncDecl(pctx, node)
-					pctx.activeVerb = verb
-					err = next()
-					if err != nil {
-						return err
-					}
-					pctx.activeVerb = nil
-					return nil
+					visitFuncDecl(pctx, node)
 
 				case *ast.GenDecl:
 					visitGenDecl(pctx, node)
@@ -200,8 +194,8 @@ func ExtractModuleSchema(dir string, sch *schema.Schema) (optional.Option[ParseR
 //   - This get's filled in with the next pass
 func extractTypeDecls(pctx *parseContext) error {
 	for _, file := range pctx.pkg.Syntax {
-		err := goast.Visit(file, func(aNode ast.Node, next func() error) (err error) {
-			node, ok := aNode.(*ast.GenDecl)
+		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()
 			}
@@ -243,7 +237,7 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 			case *types.Basic:
 				enum := &schema.Enum{
 					Pos:      goPosToSchemaPos(node.Pos()),
-					Comments: visitComments(node.Doc),
+					Comments: parseComments(node.Doc),
 					Name:     strcase.ToUpperCamel(t.Name.Name),
 					Type:     nil, //TODO: explain
 					Export:   dir.IsExported(),
@@ -270,14 +264,14 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 
 				enum := &schema.Enum{
 					Pos:      goPosToSchemaPos(node.Pos()),
-					Comments: visitComments(node.Doc),
+					Comments: parseComments(node.Doc),
 					Name:     strcase.ToUpperCamel(t.Name.Name),
 					Export:   dir.IsExported(),
 				}
-				if typ, ok := typ.(*types.Interface); ok {
+				if iTyp, ok := typ.(*types.Interface); ok {
 					pctx.nativeNames[enum] = nativeName
 					pctx.module.Decls = append(pctx.module.Decls, enum)
-					pctx.enumInterfaces[t.Name.Name] = typ
+					pctx.enumInterfaces[t.Name.Name] = iTyp
 				} else {
 					pctx.errors.add(errorf(node, "expected interface for type enum but got %q", typ))
 				}
@@ -286,7 +280,7 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 		case *directiveTypeAlias:
 			alias := &schema.TypeAlias{
 				Pos:      goPosToSchemaPos(node.Pos()),
-				Comments: visitComments(node.Doc),
+				Comments: parseComments(node.Doc),
 				Name:     strcase.ToUpperCamel(t.Name.Name),
 				Export:   dir.IsExported(),
 				Type:     nil, //TODO: explain
@@ -306,29 +300,48 @@ func extractTypeDeclsForNode(pctx *parseContext, node *ast.GenDecl) {
 	}
 }
 
-func visitCallExpr(pctx *parseContext, node *ast.CallExpr) {
+func visitCallExpr(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
 	_, fn := deref[*types.Func](pctx.pkg, node.Fun)
 	if fn == nil {
 		return
 	}
 	switch fn.FullName() {
 	case ftlCallFuncPath:
-		parseCall(pctx, node)
+		parseCall(pctx, node, stack)
 
 	case ftlConfigFuncPath, ftlSecretFuncPath:
 		// Secret/config declaration: ftl.Config[<type>](<name>)
 		parseConfigDecl(pctx, node, fn)
 
 	case ftlFSMFuncPath:
-		parseFSMDecl(pctx, node)
+		parseFSMDecl(pctx, node, stack)
 
 	case ftlPostgresDBFuncPath:
 		parseDatabaseDecl(pctx, node, schema.PostgresDatabaseType)
 	}
 }
 
-func parseCall(pctx *parseContext, node *ast.CallExpr) {
-	if pctx.activeVerb == nil {
+func parseCall(pctx *parseContext, node *ast.CallExpr, stack []ast.Node) {
+	var activeFuncDecl *ast.FuncDecl
+	for i := len(stack) - 1; i >= 0; i-- {
+		if found, ok := stack[i].(*ast.FuncDecl); ok {
+			activeFuncDecl = found
+			break
+		}
+		// use element
+	}
+	if activeFuncDecl == nil {
+		return
+	}
+	expectedVerbName := strcase.ToLowerCamel(activeFuncDecl.Name.Name)
+	var activeVerb *schema.Verb
+	for _, decl := range pctx.module.Decls {
+		if aVerb, ok := decl.(*schema.Verb); ok && aVerb.Name == expectedVerbName {
+			activeVerb = aVerb
+			break
+		}
+	}
+	if activeVerb == nil {
 		return
 	}
 	if len(node.Args) != 3 {
@@ -348,7 +361,7 @@ func parseCall(pctx *parseContext, node *ast.CallExpr) {
 		pctx.errors.add(errorf(node.Args[1], "call first argument must be a function in an ftl module%s", suffix))
 		return
 	}
-	pctx.activeVerb.AddCall(ref)
+	activeVerb.AddCall(ref)
 }
 
 func parseSelectorRef(node ast.Expr) *schema.Ref {
@@ -384,7 +397,7 @@ func parseVerbRef(pctx *parseContext, node ast.Expr) *schema.Ref {
 	}
 }
 
-func parseFSMDecl(pctx *parseContext, node *ast.CallExpr) {
+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)
@@ -404,8 +417,9 @@ func parseFSMDecl(pctx *parseContext, node *ast.CallExpr) {
 	}
 
 	fsm := &schema.FSM{
-		Pos:  goPosToSchemaPos(node.Pos()),
-		Name: name,
+		Pos:      goPosToSchemaPos(node.Pos()),
+		Name:     name,
+		Metadata: []schema.Metadata{},
 	}
 	pctx.module.Decls = append(pctx.module.Decls, fsm)
 
@@ -422,6 +436,34 @@ func parseFSMDecl(pctx *parseContext, node *ast.CallExpr) {
 		}
 		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)
+	}
+	for _, dir := range directives {
+		if retryDir, ok := dir.(*directiveRetry); ok {
+			fsm.Metadata = append(fsm.Metadata, &schema.MetadataRetry{
+				Pos:        retryDir.Pos,
+				Count:      retryDir.Count,
+				MinBackoff: retryDir.MinBackoff,
+				MaxBackoff: retryDir.MaxBackoff,
+			})
+		} else {
+			pctx.errors.add(errorf(node, "unexpected directive attached for FSM: %T", dir))
+		}
+	}
 }
 
 // Parse a Start or Transition call in an FSM declaration and add it to the FSM.
@@ -565,7 +607,7 @@ func visitFile(pctx *parseContext, node *ast.File) {
 	if node.Doc == nil {
 		return
 	}
-	pctx.module.Comments = visitComments(node.Doc)
+	pctx.module.Comments = parseComments(node.Doc)
 }
 
 func isType[T types.Type](t types.Type) bool {
@@ -753,7 +795,7 @@ func maybeVisitTypeEnumVariant(pctx *parseContext, node *ast.GenDecl, directives
 
 	enumVariant := &schema.EnumVariant{
 		Pos:      goPosToSchemaPos(node.Pos()),
-		Comments: visitComments(node.Doc),
+		Comments: parseComments(node.Doc),
 		Name:     strcase.ToUpperCamel(t.Name.Name),
 	}
 
@@ -918,7 +960,7 @@ func visitValueSpec(pctx *parseContext, node *ast.ValueSpec) {
 	if value, ok := visitConst(pctx, c).Get(); ok {
 		variant := &schema.EnumVariant{
 			Pos:      goPosToSchemaPos(c.Pos()),
-			Comments: visitComments(node.Doc),
+			Comments: parseComments(node.Doc),
 			Name:     strcase.ToUpperCamel(c.Id()),
 			Value:    value,
 		}
@@ -1056,7 +1098,7 @@ func visitFuncDecl(pctx *parseContext, node *ast.FuncDecl) (verb *schema.Verb) {
 	}
 	verb = &schema.Verb{
 		Pos:      goPosToSchemaPos(node.Pos()),
-		Comments: visitComments(node.Doc),
+		Comments: parseComments(node.Doc),
 		Export:   isExported,
 		Name:     strcase.ToLowerCamel(node.Name.Name),
 		Request:  reqV,
@@ -1068,7 +1110,7 @@ func visitFuncDecl(pctx *parseContext, node *ast.FuncDecl) (verb *schema.Verb) {
 	return verb
 }
 
-func visitComments(doc *ast.CommentGroup) []string {
+func parseComments(doc *ast.CommentGroup) []string {
 	comments := []string{}
 	if doc := doc.Text(); doc != "" {
 		comments = strings.Split(strings.TrimSpace(doc), "\n")
@@ -1160,11 +1202,11 @@ func visitStruct(pctx *parseContext, pos token.Pos, tnode types.Type, isExported
 			switch path := path[i].(type) {
 			case *ast.TypeSpec:
 				if path.Doc != nil {
-					out.Comments = visitComments(path.Doc)
+					out.Comments = parseComments(path.Doc)
 				}
 			case *ast.GenDecl:
 				if path.Doc != nil {
-					out.Comments = visitComments(path.Doc)
+					out.Comments = parseComments(path.Doc)
 				}
 			}
 		}
@@ -1463,7 +1505,6 @@ type parseContext struct {
 	module         *schema.Module
 	nativeNames    NativeNames
 	enumInterfaces enumInterfaces
-	activeVerb     *schema.Verb
 	errors         errorSet
 	schema         *schema.Schema
 }
diff --git a/go-runtime/compile/schema_test.go b/go-runtime/compile/schema_test.go
index 780bd6dd36..cb14f6a854 100644
--- a/go-runtime/compile/schema_test.go
+++ b/go-runtime/compile/schema_test.go
@@ -231,7 +231,9 @@ func TestExtractModuleSchemaFSM(t *testing.T) {
 	assert.Equal(t, r.MustGet().Errors, nil, "expected no schema errors")
 	actual := schema.Normalise(r.MustGet().Module)
 	expected := `module fsm {
-		fsm payment {
+		fsm payment
+			+retry 10 5s 10m
+		{
 			start fsm.created
 			start fsm.paid
 			transition fsm.created to fsm.paid
diff --git a/go-runtime/compile/testdata/fsm/fsm.go b/go-runtime/compile/testdata/fsm/fsm.go
index 0caa788b6f..0ef2d5f6d8 100644
--- a/go-runtime/compile/testdata/fsm/fsm.go
+++ b/go-runtime/compile/testdata/fsm/fsm.go
@@ -7,6 +7,8 @@ import (
 )
 
 // The payment FSM.
+//
+//ftl:retry 10 5s 10m
 var paymentFSM = ftl.FSM("payment",
 	ftl.Start(Created),
 	ftl.Start(Paid),
diff --git a/internal/goast/visitor.go b/internal/goast/visitor.go
index 7b5f2e4c65..899eed6426 100644
--- a/internal/goast/visitor.go
+++ b/internal/goast/visitor.go
@@ -3,561 +3,369 @@ package goast
 
 import (
 	"fmt"
-	. "go/ast" //nolint:all
+	goast "go/ast"
 )
 
-type VisitorFunc func(node Node, next func() error) error
+type VisitorFunc func(stack []goast.Node, next func() error) error
 
 // Visit all nodes in the Go AST rooted at node, in depth-first order.
 //
 // The visitor function can call next() to continue traversal.
 //
 // Note that this is based on a direct copy of ast.Walk.
-func Visit(node Node, v VisitorFunc) error { //nolint:maintidx
-	return v(node, func() error {
+func Visit(node goast.Node, v VisitorFunc) error {
+	return visitStack([]goast.Node{node}, v)
+}
+
+func visitStack(stack []goast.Node, v VisitorFunc) error { //nolint:maintidx
+	return v(stack, func() error {
 		// walk children
 		// (the order of the cases matches the order
 		// of the corresponding node sqltypes in ast.go)
-		switch n := node.(type) {
+		children := []goast.Node{}
+
+		switch n := stack[len(stack)-1].(type) {
 		// Comments and fields
-		case *Comment:
+		case *goast.Comment:
 			// nothing to do
 
-		case *CommentGroup:
+		case *goast.CommentGroup:
 			for _, c := range n.List {
-				if err := Visit(c, v); err != nil {
-					return err
-				}
+				children = append(children, c)
 			}
 
-		case *Field:
+		case *goast.Field:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
+				children = append(children, n.Doc)
 			}
-			if err := visitList(n.Names, v); err != nil {
-				return err
+			for _, c := range n.Names {
+				children = append(children, c)
 			}
 			if n.Type != nil {
-				if err := Visit(n.Type, v); err != nil {
-					return err
-				}
+				children = append(children, n.Type)
 			}
 			if n.Tag != nil {
-				if err := Visit(n.Tag, v); err != nil {
-					return err
-				}
+				children = append(children, n.Tag)
 			}
 			if n.Comment != nil {
-				if err := Visit(n.Comment, v); err != nil {
-					return err
-				}
+				children = append(children, n.Comment)
 			}
 
-		case *FieldList:
+		case *goast.FieldList:
 			for _, f := range n.List {
-				if err := Visit(f, v); err != nil {
-					return err
-				}
+				children = append(children, f)
 			}
 
 		// Expressions
-		case *BadExpr, *Ident, *BasicLit:
+		case *goast.BadExpr, *goast.Ident, *goast.BasicLit:
 			// nothing to do
 
-		case *Ellipsis:
+		case *goast.Ellipsis:
 			if n.Elt != nil {
-				if err := Visit(n.Elt, v); err != nil {
-					return err
-				}
+				children = append(children, n.Elt)
 			}
 
-		case *FuncLit:
-			if err := Visit(n.Type, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
-			}
+		case *goast.FuncLit:
+			children = append(children, n.Type, n.Body)
 
-		case *CompositeLit:
+		case *goast.CompositeLit:
 			if n.Type != nil {
-				if err := Visit(n.Type, v); err != nil {
-					return err
-				}
+				children = append(children, n.Type)
 			}
-			if err := visitList(n.Elts, v); err != nil {
-				return err
+			for _, c := range n.Elts {
+				children = append(children, c)
 			}
 
-		case *ParenExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.ParenExpr:
+			children = append(children, n.X)
 
-		case *SelectorExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Sel, v); err != nil {
-				return err
-			}
+		case *goast.SelectorExpr:
+			children = append(children, n.X, n.Sel)
 
-		case *IndexExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Index, v); err != nil {
-				return err
-			}
+		case *goast.IndexExpr:
+			children = append(children, n.X, n.Index)
 
-		case *IndexListExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.IndexListExpr:
+			children = append(children, n.X)
 			for _, index := range n.Indices {
-				if err := Visit(index, v); err != nil {
-					return err
-				}
+				children = append(children, index)
 			}
 
-		case *SliceExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.SliceExpr:
+			children = append(children, n.X)
 			if n.Low != nil {
-				if err := Visit(n.Low, v); err != nil {
-					return err
-				}
+				children = append(children, n.Low)
 			}
 			if n.High != nil {
-				if err := Visit(n.High, v); err != nil {
-					return err
-				}
+				children = append(children, n.High)
 			}
 			if n.Max != nil {
-				if err := Visit(n.Max, v); err != nil {
-					return err
-				}
+				children = append(children, n.Max)
 			}
 
-		case *TypeAssertExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.TypeAssertExpr:
+			children = append(children, n.X)
 			if n.Type != nil {
-				if err := Visit(n.Type, v); err != nil {
-					return err
-				}
+				children = append(children, n.Type)
 			}
 
-		case *CallExpr:
-			if err := Visit(n.Fun, v); err != nil {
-				return err
-			}
-			if err := visitList(n.Args, v); err != nil {
-				return err
+		case *goast.CallExpr:
+			children = append(children, n.Fun)
+			for _, c := range n.Args {
+				children = append(children, c)
 			}
 
-		case *StarExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.StarExpr:
+			children = append(children, n.X)
 
-		case *UnaryExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.UnaryExpr:
+			children = append(children, n.X)
 
-		case *BinaryExpr:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Y, v); err != nil {
-				return err
-			}
+		case *goast.BinaryExpr:
+			children = append(children, n.X, n.Y)
 
-		case *KeyValueExpr:
-			if err := Visit(n.Key, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Value, v); err != nil {
-				return err
-			}
+		case *goast.KeyValueExpr:
+			children = append(children, n.Key, n.Value)
 
 		// Types
-		case *ArrayType:
+		case *goast.ArrayType:
 			if n.Len != nil {
-				if err := Visit(n.Len, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Elt, v); err != nil {
-				return err
+				children = append(children, n.Len)
 			}
+			children = append(children, n.Elt)
 
-		case *StructType:
-			if err := Visit(n.Fields, v); err != nil {
-				return err
-			}
+		case *goast.StructType:
+			children = append(children, n.Fields)
 
-		case *FuncType:
+		case *goast.FuncType:
 			if n.TypeParams != nil {
-				if err := Visit(n.TypeParams, v); err != nil {
-					return err
-				}
+				children = append(children, n.TypeParams)
 			}
 			if n.Params != nil {
-				if err := Visit(n.Params, v); err != nil {
-					return err
-				}
+				children = append(children, n.Params)
 			}
 			if n.Results != nil {
-				if err := Visit(n.Results, v); err != nil {
-					return err
-				}
+				children = append(children, n.Results)
 			}
 
-		case *InterfaceType:
-			if err := Visit(n.Methods, v); err != nil {
-				return err
-			}
+		case *goast.InterfaceType:
+			children = append(children, n.Methods)
 
-		case *MapType:
-			if err := Visit(n.Key, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Value, v); err != nil {
-				return err
-			}
+		case *goast.MapType:
+			children = append(children, n.Key, n.Value)
 
-		case *ChanType:
-			if err := Visit(n.Value, v); err != nil {
-				return err
-			}
+		case *goast.ChanType:
+			children = append(children, n.Value)
 
 		// Statements
-		case *BadStmt:
+		case *goast.BadStmt:
 			// nothing to do
 
-		case *DeclStmt:
-			if err := Visit(n.Decl, v); err != nil {
-				return err
-			}
+		case *goast.DeclStmt:
+			children = append(children, n.Decl)
 
-		case *EmptyStmt:
+		case *goast.EmptyStmt:
 			// nothing to do
 
-		case *LabeledStmt:
-			if err := Visit(n.Label, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Stmt, v); err != nil {
-				return err
-			}
+		case *goast.LabeledStmt:
+			children = append(children, n.Label, n.Stmt)
 
-		case *ExprStmt:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.ExprStmt:
+			children = append(children, n.X)
 
-		case *SendStmt:
-			if err := Visit(n.Chan, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Value, v); err != nil {
-				return err
-			}
+		case *goast.SendStmt:
+			children = append(children, n.Chan, n.Value)
 
-		case *IncDecStmt:
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
+		case *goast.IncDecStmt:
+			children = append(children, n.X)
 
-		case *AssignStmt:
-			if err := visitList(n.Lhs, v); err != nil {
-				return err
+		case *goast.AssignStmt:
+			for _, c := range n.Lhs {
+				children = append(children, c)
 			}
-			if err := visitList(n.Rhs, v); err != nil {
-				return err
+			for _, c := range n.Rhs {
+				children = append(children, c)
 			}
 
-		case *GoStmt:
-			if err := Visit(n.Call, v); err != nil {
-				return err
-			}
+		case *goast.GoStmt:
+			children = append(children, n.Call)
 
-		case *DeferStmt:
-			if err := Visit(n.Call, v); err != nil {
-				return err
-			}
+		case *goast.DeferStmt:
+			children = append(children, n.Call)
 
-		case *ReturnStmt:
-			if err := visitList(n.Results, v); err != nil {
-				return err
+		case *goast.ReturnStmt:
+			for _, c := range n.Results {
+				children = append(children, c)
 			}
 
-		case *BranchStmt:
+		case *goast.BranchStmt:
 			if n.Label != nil {
-				if err := Visit(n.Label, v); err != nil {
-					return err
-				}
+				children = append(children, n.Label)
 			}
 
-		case *BlockStmt:
-			if err := visitList(n.List, v); err != nil {
-				return err
+		case *goast.BlockStmt:
+			for _, c := range n.List {
+				children = append(children, c)
 			}
 
-		case *IfStmt:
+		case *goast.IfStmt:
 			if n.Init != nil {
-				if err := Visit(n.Init, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Cond, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
+				children = append(children, n.Init)
 			}
+			children = append(children, n.Cond, n.Body)
 			if n.Else != nil {
-				if err := Visit(n.Else, v); err != nil {
-					return err
-				}
+				children = append(children, n.Else)
 			}
 
-		case *CaseClause:
-			if err := visitList(n.List, v); err != nil {
-				return err
+		case *goast.CaseClause:
+			for _, c := range n.List {
+				children = append(children, c)
 			}
-			if err := visitList(n.Body, v); err != nil {
-				return err
+			for _, c := range n.Body {
+				children = append(children, c)
 			}
 
-		case *SwitchStmt:
+		case *goast.SwitchStmt:
 			if n.Init != nil {
-				if err := Visit(n.Init, v); err != nil {
-					return err
-				}
+				children = append(children, n.Init)
 			}
 			if n.Tag != nil {
-				if err := Visit(n.Tag, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
+				children = append(children, n.Tag)
 			}
+			children = append(children, n.Body)
 
-		case *TypeSwitchStmt:
+		case *goast.TypeSwitchStmt:
 			if n.Init != nil {
-				if err := Visit(n.Init, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Assign, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
+				children = append(children, n.Init)
 			}
+			children = append(children, n.Assign, n.Body)
 
-		case *CommClause:
+		case *goast.CommClause:
 			if n.Comm != nil {
-				if err := Visit(n.Comm, v); err != nil {
-					return err
-				}
+				children = append(children, n.Comm)
 			}
-			if err := visitList(n.Body, v); err != nil {
-				return err
+			for _, c := range n.Body {
+				children = append(children, c)
 			}
 
-		case *SelectStmt:
-			if err := Visit(n.Body, v); err != nil {
-				return err
-			}
+		case *goast.SelectStmt:
+			children = append(children, n.Body)
 
-		case *ForStmt:
+		case *goast.ForStmt:
 			if n.Init != nil {
-				if err := Visit(n.Init, v); err != nil {
-					return err
-				}
+				children = append(children, n.Init)
 			}
 			if n.Cond != nil {
-				if err := Visit(n.Cond, v); err != nil {
-					return err
-				}
+				children = append(children, n.Cond)
 			}
 			if n.Post != nil {
-				if err := Visit(n.Post, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
+				children = append(children, n.Post)
 			}
+			children = append(children, n.Body)
 
-		case *RangeStmt:
+		case *goast.RangeStmt:
 			if n.Key != nil {
-				if err := Visit(n.Key, v); err != nil {
-					return err
-				}
+				children = append(children, n.Key)
 			}
 			if n.Value != nil {
-				if err := Visit(n.Value, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.X, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Body, v); err != nil {
-				return err
+				children = append(children, n.Value)
 			}
+			children = append(children, n.X, n.Body)
 
 		// Declarations
-		case *ImportSpec:
+		case *goast.ImportSpec:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
+				children = append(children, n.Doc)
 			}
 			if n.Name != nil {
-				if err := Visit(n.Name, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Path, v); err != nil {
-				return err
+				children = append(children, n.Name)
 			}
+			children = append(children, n.Path)
 			if n.Comment != nil {
-				if err := Visit(n.Comment, v); err != nil {
-					return err
-				}
+				children = append(children, n.Comment)
 			}
 
-		case *ValueSpec:
+		case *goast.ValueSpec:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
+				children = append(children, n.Doc)
 			}
-			if err := visitList(n.Names, v); err != nil {
-				return err
+			for _, c := range n.Names {
+				children = append(children, c)
 			}
 			if n.Type != nil {
-				if err := Visit(n.Type, v); err != nil {
-					return err
-				}
+				children = append(children, n.Type)
 			}
-			if err := visitList(n.Values, v); err != nil {
-				return err
+			for _, c := range n.Values {
+				children = append(children, c)
 			}
 			if n.Comment != nil {
-				if err := Visit(n.Comment, v); err != nil {
-					return err
-				}
+				children = append(children, n.Comment)
 			}
 
-		case *TypeSpec:
+		case *goast.TypeSpec:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Name, v); err != nil {
-				return err
+				children = append(children, n.Doc)
 			}
+			children = append(children, n.Name)
 			if n.TypeParams != nil {
-				if err := Visit(n.TypeParams, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Type, v); err != nil {
-				return err
+				children = append(children, n.TypeParams)
 			}
+			children = append(children, n.Type)
 			if n.Comment != nil {
-				if err := Visit(n.Comment, v); err != nil {
-					return err
-				}
+				children = append(children, n.Comment)
 			}
 
-		case *BadDecl:
+		case *goast.BadDecl:
 			// nothing to do
 
-		case *GenDecl:
+		case *goast.GenDecl:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
+				children = append(children, n.Doc)
 			}
 			for _, s := range n.Specs {
-				if err := Visit(s, v); err != nil {
-					return err
-				}
+				children = append(children, s)
 			}
 
-		case *FuncDecl:
+		case *goast.FuncDecl:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
+				children = append(children, n.Doc)
 			}
 			if n.Recv != nil {
-				if err := Visit(n.Recv, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Name, v); err != nil {
-				return err
-			}
-			if err := Visit(n.Type, v); err != nil {
-				return err
+				children = append(children, n.Recv)
 			}
+			children = append(children, n.Name, n.Type)
 			if n.Body != nil {
-				if err := Visit(n.Body, v); err != nil {
-					return err
-				}
+				children = append(children, n.Body)
 			}
 
 		// Files and packages
-		case *File:
+		case *goast.File:
 			if n.Doc != nil {
-				if err := Visit(n.Doc, v); err != nil {
-					return err
-				}
-			}
-			if err := Visit(n.Name, v); err != nil {
-				return err
+				children = append(children, n.Doc)
 			}
-			if err := visitList(n.Decls, v); err != nil {
-				return err
+			children = append(children, n.Name)
+			for _, c := range n.Decls {
+				children = append(children, c)
 			}
 			// don't walk n.Comments - they have been
 			// visited already through the individual
 			// nodes
 
-		case *Package:
+		case *goast.Package:
 			for _, f := range n.Files {
-				if err := Visit(f, v); err != nil {
-					return err
-				}
+				children = append(children, f)
 			}
 		default:
 			panic(fmt.Sprintf("ast.Walk: unexpected node type %T", n))
 		}
 
+		for _, child := range children {
+			stack = append(stack, child)
+			if err := visitStack(stack, v); err != nil {
+				return err
+			}
+			stack = stack[:len(stack)-1]
+		}
 		return nil
 	})
 }
-
-func visitList[T Node](list []T, v VisitorFunc) error {
-	for _, x := range list {
-		if err := Visit(x, v); err != nil {
-			return err
-		}
-	}
-	return nil
-}