diff --git a/go/test_platform/steps/execute/build.pb.go b/go/test_platform/steps/execute/build.pb.go
index ba76703..46456b3 100644
--- a/go/test_platform/steps/execute/build.pb.go
+++ b/go/test_platform/steps/execute/build.pb.go
@@ -25,6 +25,7 @@
 // https://chromium.googlesource.com/infra/luci/luci-go/+/master/buildbucket/proto/build.proto
 type Build struct {
 	CreateTime           *timestamp.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
+	Id                   int64                `protobuf:"varint,2,opt,name=id,proto3" json:"id,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
 	XXX_unrecognized     []byte               `json:"-"`
 	XXX_sizecache        int32                `json:"-"`
@@ -62,6 +63,13 @@
 	return nil
 }
 
+func (m *Build) GetId() int64 {
+	if m != nil {
+		return m.Id
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*Build)(nil), "test_platform.steps.execute.Build")
 }
@@ -71,17 +79,18 @@
 }
 
 var fileDescriptor_3bfb5ba3da11fbc5 = []byte{
-	// 186 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0xcf, 0xb1, 0x6e, 0xc2, 0x30,
-	0x10, 0x80, 0x61, 0x65, 0x68, 0x07, 0x67, 0xcb, 0x54, 0xa5, 0x43, 0xab, 0x2e, 0x65, 0xba, 0x93,
-	0x60, 0x64, 0x8b, 0x40, 0xec, 0x88, 0x89, 0x25, 0x72, 0xc2, 0xc5, 0x58, 0x8a, 0x39, 0xcb, 0x3e,
-	0x4b, 0x3c, 0x3e, 0x4a, 0x4c, 0x06, 0x16, 0x46, 0x5b, 0xdf, 0x7f, 0xba, 0x53, 0xff, 0x42, 0x51,
-	0x5a, 0x3f, 0x6a, 0x19, 0x38, 0x38, 0x8c, 0x42, 0x3e, 0x22, 0xdd, 0xa9, 0x4f, 0x42, 0xd8, 0x25,
-	0x3b, 0x5e, 0xc0, 0x07, 0x16, 0xae, 0xbe, 0x5f, 0x20, 0xcc, 0x10, 0x9e, 0xb0, 0xfe, 0x31, 0xcc,
-	0x66, 0x24, 0x9c, 0x69, 0x97, 0x06, 0x14, 0xeb, 0x28, 0x8a, 0x76, 0x3e, 0xd7, 0x7f, 0x3b, 0xf5,
-	0xd1, 0x4c, 0xc3, 0xaa, 0xad, 0x2a, 0xfb, 0x40, 0x5a, 0xa8, 0x9d, 0xc8, 0x57, 0xf1, 0x5b, 0xac,
-	0xca, 0x75, 0x0d, 0xb9, 0x87, 0xa5, 0x87, 0xd3, 0xd2, 0x1f, 0x55, 0xe6, 0xd3, 0x47, 0x73, 0x38,
-	0xef, 0x0d, 0x43, 0x7f, 0x0d, 0xec, 0x6c, 0x72, 0xc0, 0xc1, 0xe0, 0xf2, 0xe0, 0x88, 0xf6, 0x36,
-	0x04, 0x9d, 0x57, 0x40, 0xc3, 0xf8, 0xe6, 0xb0, 0xee, 0x73, 0x56, 0x9b, 0x47, 0x00, 0x00, 0x00,
-	0xff, 0xff, 0xc7, 0xea, 0xcd, 0x4d, 0xfe, 0x00, 0x00, 0x00,
+	// 199 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0xcf, 0x31, 0x4b, 0xc5, 0x30,
+	0x10, 0xc0, 0x71, 0x5a, 0xd1, 0x21, 0x0f, 0x1c, 0x3a, 0x3d, 0x9e, 0x83, 0xc5, 0xc5, 0x4e, 0x77,
+	0xa0, 0xa3, 0x5b, 0x41, 0xdc, 0x4b, 0x27, 0x97, 0x92, 0xb6, 0xd7, 0x18, 0x68, 0xbc, 0x90, 0x5c,
+	0xc0, 0x8f, 0x2f, 0x6d, 0xec, 0xe0, 0xf2, 0xc6, 0x84, 0xdf, 0xff, 0xb8, 0x53, 0xcf, 0x42, 0x51,
+	0x06, 0xbf, 0x6a, 0x59, 0x38, 0x38, 0x8c, 0x42, 0x3e, 0x22, 0xfd, 0xd0, 0x94, 0x84, 0x70, 0x4c,
+	0x76, 0x9d, 0xc1, 0x07, 0x16, 0xae, 0x1e, 0xfe, 0x41, 0xd8, 0x21, 0xfc, 0xc1, 0xcb, 0xa3, 0x61,
+	0x36, 0x2b, 0xe1, 0x4e, 0xc7, 0xb4, 0xa0, 0x58, 0x47, 0x51, 0xb4, 0xf3, 0xb9, 0x7e, 0xea, 0xd5,
+	0x6d, 0xbb, 0x0d, 0xab, 0xde, 0xd4, 0x69, 0x0a, 0xa4, 0x85, 0x86, 0x8d, 0x9c, 0x8b, 0xba, 0x68,
+	0x4e, 0x2f, 0x17, 0xc8, 0x3d, 0x1c, 0x3d, 0xf4, 0x47, 0xdf, 0xa9, 0xcc, 0xb7, 0x8f, 0xea, 0x5e,
+	0x95, 0x76, 0x3e, 0x97, 0x75, 0xd1, 0xdc, 0x74, 0xa5, 0x9d, 0xdb, 0x8f, 0xcf, 0x77, 0xc3, 0x30,
+	0x7d, 0x05, 0x76, 0x36, 0x39, 0xe0, 0x60, 0xf0, 0x78, 0x70, 0x44, 0xfb, 0xbd, 0x04, 0x9d, 0x57,
+	0x42, 0xc3, 0x78, 0xe5, 0xd0, 0xf1, 0x6e, 0x57, 0xaf, 0xbf, 0x01, 0x00, 0x00, 0xff, 0xff, 0x97,
+	0x95, 0x69, 0x50, 0x0e, 0x01, 0x00, 0x00,
 }
diff --git a/src/test_platform/steps/execute/build.proto b/src/test_platform/steps/execute/build.proto
index 73c27e9..8b75840 100644
--- a/src/test_platform/steps/execute/build.proto
+++ b/src/test_platform/steps/execute/build.proto
@@ -14,4 +14,6 @@
 // https://chromium.googlesource.com/infra/luci/luci-go/+/master/buildbucket/proto/build.proto
 message Build {
     google.protobuf.Timestamp create_time = 1;
+
+    int64 id = 2;
 }
\ No newline at end of file