diff --git a/go/chromite/api/build_api_test.pb.go b/go/chromite/api/build_api_test.pb.go
index 6dd2cec..b072b2a 100644
--- a/go/chromite/api/build_api_test.pb.go
+++ b/go/chromite/api/build_api_test.pb.go
@@ -64,6 +64,61 @@
 	return nil
 }
 
+type MultiFieldMessage struct {
+	Id                   int32    `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	Name                 string   `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
+	Flag                 bool     `protobuf:"varint,3,opt,name=flag,proto3" json:"flag,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *MultiFieldMessage) Reset()         { *m = MultiFieldMessage{} }
+func (m *MultiFieldMessage) String() string { return proto.CompactTextString(m) }
+func (*MultiFieldMessage) ProtoMessage()    {}
+func (*MultiFieldMessage) Descriptor() ([]byte, []int) {
+	return fileDescriptor_78ca3263cf74c05a, []int{1}
+}
+
+func (m *MultiFieldMessage) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_MultiFieldMessage.Unmarshal(m, b)
+}
+func (m *MultiFieldMessage) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_MultiFieldMessage.Marshal(b, m, deterministic)
+}
+func (m *MultiFieldMessage) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_MultiFieldMessage.Merge(m, src)
+}
+func (m *MultiFieldMessage) XXX_Size() int {
+	return xxx_messageInfo_MultiFieldMessage.Size(m)
+}
+func (m *MultiFieldMessage) XXX_DiscardUnknown() {
+	xxx_messageInfo_MultiFieldMessage.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_MultiFieldMessage proto.InternalMessageInfo
+
+func (m *MultiFieldMessage) GetId() int32 {
+	if m != nil {
+		return m.Id
+	}
+	return 0
+}
+
+func (m *MultiFieldMessage) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *MultiFieldMessage) GetFlag() bool {
+	if m != nil {
+		return m.Flag
+	}
+	return false
+}
+
 // Simple input message.
 type TestRequestMessage struct {
 	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
@@ -78,18 +133,20 @@
 	BuildTarget  *chromiumos.BuildTarget   `protobuf:"bytes,7,opt,name=build_target,json=buildTarget,proto3" json:"build_target,omitempty"`
 	BuildTargets []*chromiumos.BuildTarget `protobuf:"bytes,8,rep,name=build_targets,json=buildTargets,proto3" json:"build_targets,omitempty"`
 	// For SyncedDir syncing tests.
-	SyncedDir            *chromiumos.SyncedDir   `protobuf:"bytes,9,opt,name=synced_dir,json=syncedDir,proto3" json:"synced_dir,omitempty"`
-	SyncedDirs           []*chromiumos.SyncedDir `protobuf:"bytes,10,rep,name=synced_dirs,json=syncedDirs,proto3" json:"synced_dirs,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
-	XXX_unrecognized     []byte                  `json:"-"`
-	XXX_sizecache        int32                   `json:"-"`
+	SyncedDir  *chromiumos.SyncedDir   `protobuf:"bytes,9,opt,name=synced_dir,json=syncedDir,proto3" json:"synced_dir,omitempty"`
+	SyncedDirs []*chromiumos.SyncedDir `protobuf:"bytes,10,rep,name=synced_dirs,json=syncedDirs,proto3" json:"synced_dirs,omitempty"`
+	// Repeated message with multiple fields.
+	Messages             []*MultiFieldMessage `protobuf:"bytes,11,rep,name=messages,proto3" json:"messages,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
+	XXX_unrecognized     []byte               `json:"-"`
+	XXX_sizecache        int32                `json:"-"`
 }
 
 func (m *TestRequestMessage) Reset()         { *m = TestRequestMessage{} }
 func (m *TestRequestMessage) String() string { return proto.CompactTextString(m) }
 func (*TestRequestMessage) ProtoMessage()    {}
 func (*TestRequestMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_78ca3263cf74c05a, []int{1}
+	return fileDescriptor_78ca3263cf74c05a, []int{2}
 }
 
 func (m *TestRequestMessage) XXX_Unmarshal(b []byte) error {
@@ -180,6 +237,13 @@
 	return nil
 }
 
+func (m *TestRequestMessage) GetMessages() []*MultiFieldMessage {
+	if m != nil {
+		return m.Messages
+	}
+	return nil
+}
+
 // Simple output message.
 type TestResultMessage struct {
 	Result string `protobuf:"bytes,1,opt,name=result,proto3" json:"result,omitempty"`
@@ -197,7 +261,7 @@
 func (m *TestResultMessage) String() string { return proto.CompactTextString(m) }
 func (*TestResultMessage) ProtoMessage()    {}
 func (*TestResultMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor_78ca3263cf74c05a, []int{2}
+	return fileDescriptor_78ca3263cf74c05a, []int{3}
 }
 
 func (m *TestResultMessage) XXX_Unmarshal(b []byte) error {
@@ -255,6 +319,7 @@
 
 func init() {
 	proto.RegisterType((*NestedPath)(nil), "chromite.api.NestedPath")
+	proto.RegisterType((*MultiFieldMessage)(nil), "chromite.api.MultiFieldMessage")
 	proto.RegisterType((*TestRequestMessage)(nil), "chromite.api.TestRequestMessage")
 	proto.RegisterType((*TestResultMessage)(nil), "chromite.api.TestResultMessage")
 }
@@ -262,47 +327,51 @@
 func init() { proto.RegisterFile("chromite/api/build_api_test.proto", fileDescriptor_78ca3263cf74c05a) }
 
 var fileDescriptor_78ca3263cf74c05a = []byte{
-	// 632 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x95, 0xcf, 0x6e, 0xd3, 0x4c,
-	0x14, 0xc5, 0xe5, 0x34, 0xcd, 0xd7, 0x5c, 0xa7, 0xf9, 0xd2, 0x11, 0xa4, 0xc6, 0x20, 0x51, 0x22,
-	0x16, 0x08, 0x21, 0x5b, 0x4a, 0x51, 0xf9, 0x23, 0x36, 0x6d, 0x61, 0xd1, 0x45, 0x5b, 0xe4, 0x56,
-	0x2c, 0x58, 0x10, 0xa6, 0xf6, 0x6d, 0x32, 0x52, 0xed, 0x31, 0x33, 0xe3, 0x4a, 0x3c, 0x01, 0xef,
-	0x95, 0x77, 0x61, 0x99, 0x07, 0x40, 0x02, 0x09, 0x79, 0xc6, 0x89, 0x1d, 0xd2, 0x94, 0x4d, 0xd8,
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-	0x4f, 0x53, 0xe6, 0x5f, 0x64, 0xec, 0x2a, 0x1a, 0xd0, 0x94, 0x0d, 0x14, 0x4a, 0xe5, 0xa5, 0x82,
-	0x2b, 0x4e, 0x5a, 0x53, 0x8b, 0x47, 0x53, 0xe6, 0x3e, 0xb8, 0x19, 0x30, 0x5e, 0x77, 0xdb, 0xa8,
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-	0x30, 0xc3, 0x64, 0xef, 0x97, 0x05, 0x5b, 0x66, 0x27, 0xe4, 0xd1, 0xa7, 0x1b, 0xa1, 0x0b, 0x0d,
-	0xd3, 0x8b, 0x62, 0x33, 0x14, 0x23, 0xf2, 0x0c, 0x36, 0xa8, 0x50, 0xec, 0x92, 0x86, 0xd3, 0x2d,
-	0xb1, 0xb8, 0x74, 0x33, 0x07, 0xd9, 0x87, 0xff, 0x8b, 0x75, 0x9b, 0x41, 0x6b, 0x7f, 0x59, 0xbb,
-	0xb6, 0x01, 0xf6, 0xa7, 0x53, 0x78, 0xd0, 0x9c, 0xb2, 0xd2, 0xa9, 0xeb, 0x50, 0x8b, 0x15, 0x4b,
-	0x0b, 0xf1, 0xa1, 0x81, 0xd7, 0x98, 0x28, 0xe9, 0xac, 0x2f, 0xf6, 0xfc, 0x58, 0x9f, 0x9b, 0x77,
-	0xb9, 0x1e, 0x14, 0xb6, 0xfe, 0x77, 0x0b, 0xda, 0x79, 0xfe, 0xfd, 0x94, 0x9d, 0xa1, 0xb8, 0x66,
-	0x21, 0x92, 0x0f, 0xb0, 0x75, 0x94, 0xa4, 0x99, 0x3a, 0xcd, 0x54, 0x9a, 0xa9, 0x63, 0x54, 0x23,
-	0x1e, 0x91, 0x9d, 0xf9, 0x4f, 0x5e, 0x3c, 0x3c, 0xee, 0xc3, 0x9b, 0x1c, 0xd5, 0xa6, 0x22, 0x6c,
-	0x06, 0x98, 0xd0, 0x18, 0xa3, 0x95, 0xcd, 0xd9, 0xdb, 0x1a, 0x4f, 0xdc, 0x4d, 0xb0, 0x0f, 0xb9,
-	0x10, 0x18, 0xaa, 0x13, 0x1a, 0xa3, 0x7b, 0x67, 0x3c, 0x71, 0x3b, 0xd0, 0x9e, 0xff, 0x15, 0xf5,
-	0x7f, 0x58, 0xd0, 0x3d, 0x4a, 0x24, 0x8b, 0xd0, 0x9c, 0xdb, 0x4a, 0xde, 0x4f, 0x70, 0xcf, 0x28,
-	0xc5, 0x0b, 0x33, 0x58, 0x5d, 0xee, 0x21, 0xb8, 0x73, 0xf3, 0x9f, 0x66, 0x6a, 0xa5, 0x05, 0x7a,
-	0x8d, 0xf1, 0xc4, 0xad, 0x75, 0x6a, 0x6e, 0x77, 0x3c, 0x71, 0xc9, 0x9f, 0xc9, 0x3b, 0x56, 0xff,
-	0xa7, 0x05, 0xdb, 0x45, 0xd1, 0x85, 0xf0, 0x9f, 0xe1, 0x7e, 0x21, 0xfd, 0xa3, 0xaf, 0xcb, 0xe3,
-	0xcf, 0x57, 0x58, 0x71, 0x7f, 0x8b, 0xf8, 0xd6, 0x92, 0xf8, 0xb5, 0x83, 0x97, 0x1f, 0xf7, 0x86,
-	0x7c, 0x76, 0x0e, 0x3c, 0x2e, 0x86, 0x7e, 0xe5, 0x32, 0x61, 0xc9, 0xa5, 0xa0, 0xbe, 0xbe, 0x4a,
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-	0x53, 0x13, 0xb7, 0xd6, 0xe5, 0x06, 0x00, 0x00,
+	// 690 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x95, 0xdd, 0x6e, 0xd3, 0x30,
+	0x14, 0xc7, 0x95, 0xb6, 0x2b, 0xed, 0x49, 0x57, 0x5a, 0x0b, 0xba, 0x10, 0x90, 0x56, 0x2a, 0x2e,
+	0x26, 0x84, 0x12, 0xa9, 0x43, 0xe3, 0xf3, 0x66, 0x1b, 0x20, 0x4d, 0xa8, 0x1b, 0xca, 0x26, 0x2e,
+	0xb8, 0xa0, 0x78, 0x89, 0x97, 0x5a, 0x6a, 0x3e, 0xb0, 0x9d, 0x49, 0xbc, 0x5e, 0xc5, 0xab, 0x70,
+	0xd9, 0x07, 0x40, 0x02, 0x09, 0xc5, 0x4e, 0xd3, 0x94, 0x6c, 0xe3, 0xa6, 0xdc, 0x39, 0xf9, 0x9f,
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+	0xba, 0xa3, 0x64, 0x2a, 0xe8, 0x3b, 0x4a, 0xa6, 0xde, 0x88, 0x70, 0x8e, 0x7d, 0x82, 0xda, 0x50,
+	0xa1, 0x9e, 0x04, 0x37, 0x9c, 0x0a, 0xf5, 0x10, 0x82, 0x5a, 0x88, 0x03, 0x62, 0x54, 0xfa, 0xda,
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+	0x1e, 0x7c, 0xaf, 0x01, 0x3a, 0x23, 0x5c, 0x38, 0xe4, 0x6b, 0x42, 0xb8, 0x28, 0xa7, 0x6b, 0xca,
+	0x74, 0x8f, 0xa1, 0x9e, 0x6e, 0x26, 0x12, 0x32, 0xa1, 0x3e, 0x44, 0xc5, 0xbd, 0x1d, 0x4a, 0xc5,
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+	0xd5, 0x9b, 0xe0, 0x56, 0x01, 0xe6, 0xe8, 0x29, 0x00, 0xff, 0x16, 0xba, 0xc4, 0x1b, 0x7b, 0x94,
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+	0x9a, 0x3e, 0x37, 0x74, 0x09, 0x6d, 0xaf, 0x36, 0xb6, 0x74, 0xe8, 0x9c, 0x1c, 0x18, 0xfc, 0xd6,
+	0xa0, 0xab, 0x8e, 0x51, 0xda, 0xb7, 0xc5, 0x29, 0xea, 0x41, 0x5d, 0x35, 0x32, 0x3b, 0x49, 0xd9,
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+	0x34, 0x17, 0x2c, 0x37, 0x6a, 0xd2, 0x5c, 0xb9, 0xe2, 0x32, 0x04, 0xd9, 0x50, 0x27, 0x97, 0x24,
+	0x14, 0xdc, 0xd8, 0x28, 0x0f, 0x6c, 0x24, 0x6f, 0xf0, 0xdb, 0x54, 0x77, 0xb2, 0xb0, 0xe1, 0x0f,
+	0x0d, 0xda, 0xa9, 0xff, 0xfd, 0x98, 0x9e, 0x12, 0x76, 0x49, 0x5d, 0x82, 0x3e, 0x42, 0xf7, 0x28,
+	0x8c, 0x13, 0x71, 0x92, 0x88, 0x38, 0x11, 0x23, 0x22, 0x26, 0x91, 0x87, 0xfa, 0xab, 0x5b, 0x2e,
+	0xdf, 0x3c, 0x73, 0xfb, 0xaa, 0x88, 0x62, 0x53, 0x09, 0x6c, 0x3a, 0x24, 0xbd, 0xcf, 0xde, 0xda,
+	0x72, 0x0e, 0xba, 0xb3, 0xb9, 0xb9, 0x09, 0xfa, 0x61, 0xc4, 0x18, 0x71, 0xc5, 0x31, 0x0e, 0x88,
+	0x79, 0x67, 0x36, 0x37, 0x3b, 0xd0, 0x5e, 0xfd, 0x28, 0x0e, 0x7f, 0x6a, 0xd0, 0x3b, 0x0a, 0x39,
+	0xf5, 0x88, 0xba, 0xf4, 0x05, 0xbf, 0x9f, 0xe1, 0x9e, 0x52, 0xb2, 0x17, 0xea, 0x61, 0x7d, 0xbe,
+	0x7d, 0x30, 0x57, 0xf2, 0x9f, 0x24, 0x62, 0xad, 0x05, 0x06, 0xf5, 0xd9, 0xdc, 0xac, 0x74, 0x2a,
+	0x66, 0x6f, 0x36, 0x37, 0xd1, 0xdf, 0xce, 0x3b, 0xda, 0xf0, 0x97, 0x06, 0x5b, 0x59, 0xd1, 0x92,
+	0xf9, 0x2f, 0x70, 0x3f, 0x93, 0xfe, 0xd3, 0xee, 0x52, 0xfb, 0xab, 0x15, 0xd6, 0xdc, 0xdf, 0xcc,
+	0xbe, 0x76, 0x8d, 0xfd, 0xca, 0xc1, 0xf3, 0x4f, 0x7b, 0x7e, 0x94, 0xdf, 0x03, 0x2b, 0x62, 0xbe,
+	0x5d, 0xf8, 0xad, 0xd1, 0xf0, 0x82, 0x61, 0x5b, 0xfe, 0xd4, 0x6c, 0x3f, 0xb2, 0x8b, 0xff, 0xc9,
+	0xf3, 0xba, 0x7c, 0xbd, 0xfb, 0x27, 0x00, 0x00, 0xff, 0xff, 0x2d, 0x52, 0x72, 0xe2, 0x6f, 0x07,
+	0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/src/chromite/api/build_api_test.proto b/src/chromite/api/build_api_test.proto
index a61e63e..2f281d0 100644
--- a/src/chromite/api/build_api_test.proto
+++ b/src/chromite/api/build_api_test.proto
@@ -14,6 +14,12 @@
   chromiumos.Path path = 1;
 }
 
+message MultiFieldMessage {
+  int32 id = 1;
+  string name = 2;
+  bool flag = 3;
+}
+
 // Simple input message.
 message TestRequestMessage {
   string id = 1;
@@ -30,6 +36,8 @@
   // For SyncedDir syncing tests.
   chromiumos.SyncedDir synced_dir = 9;
   repeated chromiumos.SyncedDir synced_dirs = 10;
+  // Repeated message with multiple fields.
+  repeated MultiFieldMessage messages = 11;
 }
 
 // Simple output message.