diff --git a/go/test_platform/request.pb.go b/go/test_platform/request.pb.go
index 816a397..94593e0 100644
--- a/go/test_platform/request.pb.go
+++ b/go/test_platform/request.pb.go
@@ -789,12 +789,6 @@
 // Migrations defines parameters that facilitate gradual migrations between
 // different implementations of downstream components.
 type Request_Params_Migrations struct {
-	// If true, schedule individual tests via buildbucket and run them via
-	// test_runner recipe.
-	// Otherwise, schedule individual tests via raw swarming calls and run
-	// them via skylab_swarming_worker.
-	// TODO(crbug/1033287): remove when migration is complete.
-	UseTestRunner bool `protobuf:"varint,1,opt,name=use_test_runner,json=useTestRunner,proto3" json:"use_test_runner,omitempty"`
 	// If true, test tasks will perform synchronous offload of the contents
 	// of $SYNCHRONOUS_OFFLOAD_DIR to a GS bucket. This requires
 	// use_test_runner to also be set to true: if use_test_runner is set to
@@ -836,13 +830,6 @@
 
 var xxx_messageInfo_Request_Params_Migrations proto.InternalMessageInfo
 
-func (m *Request_Params_Migrations) GetUseTestRunner() bool {
-	if m != nil {
-		return m.UseTestRunner
-	}
-	return false
-}
-
 func (m *Request_Params_Migrations) GetEnableSynchronousOffload() bool {
 	if m != nil {
 		return m.EnableSynchronousOffload
@@ -1212,95 +1199,94 @@
 func init() { proto.RegisterFile("test_platform/request.proto", fileDescriptor_7f5ab0d1581e8f0c) }
 
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+	0x27, 0xfa, 0x4f, 0x65, 0x80, 0x59, 0x65, 0xa0, 0x2f, 0x61, 0xc5, 0x23, 0x3e, 0xb1, 0xa9, 0x65,
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+	0x1e, 0x00, 0x9c, 0x0b, 0x93, 0x8c, 0x46, 0x2c, 0xf4, 0x83, 0x38, 0x38, 0xbc, 0x7c, 0x2e, 0x9a,
+	0xb1, 0xe0, 0xd1, 0x2f, 0x25, 0xa8, 0xe5, 0x8e, 0x80, 0xee, 0x43, 0xfd, 0xb8, 0x79, 0xd2, 0x7c,
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+	0xec, 0xb4, 0xb5, 0x05, 0xb4, 0x01, 0xeb, 0x05, 0xed, 0xfe, 0x5b, 0xad, 0x84, 0x36, 0x41, 0x2b,
+	0x08, 0x5b, 0x5f, 0xf4, 0xb5, 0x45, 0xb4, 0x05, 0x1b, 0x05, 0x69, 0x6f, 0x70, 0xd8, 0xef, 0xf4,
+	0xb4, 0xf2, 0x1c, 0x7c, 0xbf, 0xdf, 0xd3, 0x14, 0xf4, 0x00, 0xee, 0x5d, 0x95, 0x9a, 0xdd, 0x0e,
+	0x6e, 0x0d, 0x0e, 0xdf, 0xb4, 0xb5, 0x0a, 0xda, 0x86, 0xad, 0xa2, 0xfa, 0xf4, 0xa4, 0x7f, 0x78,
+	0x32, 0x38, 0x1d, 0xf4, 0xb4, 0x2a, 0x7a, 0x08, 0x7a, 0x41, 0xd9, 0xc4, 0xfb, 0x66, 0x17, 0x77,
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+	0xa6, 0xa6, 0xb6, 0xaa, 0xa0, 0x44, 0x59, 0xd5, 0x1b, 0x50, 0x91, 0x5d, 0x2a, 0x2a, 0x16, 0xe2,
+	0xba, 0xec, 0x52, 0x5e, 0xa2, 0x8a, 0xe3, 0x0d, 0xd2, 0xa0, 0xec, 0x91, 0xf7, 0x32, 0xf7, 0x15,
+	0x1c, 0x2d, 0xf5, 0x73, 0x50, 0xd3, 0xc6, 0x84, 0x9e, 0xc2, 0x9d, 0xc2, 0x87, 0xde, 0x0c, 0x79,
+	0x5a, 0x6c, 0xeb, 0x91, 0x22, 0x05, 0x0e, 0xb8, 0x8b, 0xf6, 0xe0, 0x9e, 0x45, 0x87, 0xa1, 0x6d,
+	0x8a, 0xa9, 0x37, 0x64, 0xae, 0x30, 0x09, 0x1f, 0x9d, 0x39, 0x17, 0x54, 0x72, 0xe4, 0xdd, 0xe2,
+	0xbb, 0x12, 0xd0, 0x8b, 0xf5, 0xcd, 0x58, 0x3d, 0xe0, 0xae, 0xfe, 0x06, 0x94, 0xa8, 0x97, 0xa1,
+	0x36, 0x68, 0x1e, 0x79, 0xef, 0x78, 0xa1, 0x67, 0xa6, 0x13, 0x42, 0xf2, 0x4d, 0xbd, 0x67, 0xc4,
+	0x23, 0x84, 0x91, 0x8e, 0x10, 0x46, 0x3b, 0x01, 0xe0, 0xf5, 0x84, 0x92, 0x0a, 0xf4, 0x9f, 0x4b,
+	0x50, 0xcb, 0xf5, 0x36, 0xe4, 0x80, 0x46, 0xc2, 0x80, 0xc9, 0x40, 0xde, 0xd1, 0xe9, 0x05, 0x71,
+	0xe3, 0x22, 0xad, 0xed, 0x7e, 0x76, 0xeb, 0x06, 0x69, 0x34, 0x13, 0x0b, 0xaf, 0x63, 0x03, 0x1d,
+	0x3f, 0x6a, 0xfc, 0xeb, 0xa4, 0x28, 0x45, 0x08, 0x94, 0x80, 0xd8, 0xd1, 0x57, 0x3a, 0xea, 0x01,
+	0x72, 0xad, 0xb7, 0x60, 0xf3, 0x63, 0xe4, 0x28, 0xf3, 0xef, 0xe8, 0x34, 0xc9, 0x66, 0xb4, 0x8c,
+	0x6e, 0xe8, 0x82, 0xb8, 0x21, 0x4d, 0xb2, 0x15, 0x6f, 0x9e, 0x2f, 0x7e, 0x5a, 0xd2, 0xbf, 0x2d,
+	0x01, 0xcc, 0x5a, 0x2c, 0x7a, 0x01, 0x3a, 0xf5, 0xc9, 0xd0, 0xa5, 0xa6, 0x98, 0xfa, 0x51, 0x8f,
+	0xf0, 0x59, 0x28, 0x4c, 0x36, 0x1e, 0xbb, 0x8c, 0x58, 0x92, 0xad, 0xe2, 0x7a, 0x8c, 0xe8, 0xcd,
+	0x00, 0xa7, 0xb1, 0x1e, 0xed, 0x41, 0xdd, 0x67, 0x81, 0x33, 0x76, 0x46, 0xd2, 0x9c, 0x4b, 0xc5,
+	0x8c, 0x5b, 0x96, 0xdc, 0xad, 0xab, 0xfa, 0x84, 0x7a, 0xa4, 0xa8, 0x25, 0x6d, 0x11, 0xaf, 0x87,
+	0x82, 0x9a, 0x32, 0x73, 0x3c, 0xf4, 0x7d, 0xca, 0x8f, 0x14, 0xb5, 0xa6, 0xad, 0x1c, 0x29, 0x2a,
+	0x68, 0x35, 0xbc, 0x9a, 0xe7, 0x0a, 0x5c, 0x75, 0xa9, 0x4d, 0x46, 0x53, 0x7d, 0x1b, 0x2a, 0xbd,
+	0xd0, 0x09, 0x68, 0x94, 0x22, 0x9f, 0x78, 0x34, 0x89, 0x5b, 0xae, 0xf5, 0x0f, 0x25, 0x50, 0xa2,
+	0x81, 0x2b, 0xfa, 0x84, 0xa6, 0x29, 0x4d, 0x2e, 0xfe, 0xef, 0x37, 0xcc, 0x67, 0xd9, 0xa5, 0x1c,
+	0x2c, 0xe0, 0x8c, 0xa7, 0x7f, 0x0d, 0x6a, 0x2a, 0xff, 0x98, 0x33, 0xb4, 0x9d, 0x0c, 0x81, 0x84,
+	0xdb, 0x22, 0xc9, 0xb4, 0x9c, 0xf1, 0x9a, 0xdc, 0x16, 0xe8, 0x6f, 0xb0, 0x62, 0x39, 0x62, 0xe2,
+	0x92, 0xa9, 0x29, 0x89, 0xb2, 0x13, 0xe3, 0x5a, 0x22, 0x3b, 0x21, 0x1e, 0x6d, 0x2d, 0xc3, 0xd2,
+	0x19, 0xe1, 0x3e, 0x15, 0x42, 0xff, 0xbe, 0x0c, 0xb5, 0x8e, 0x1f, 0x7a, 0x34, 0xbe, 0x18, 0x74,
+	0x06, 0x9b, 0xd9, 0x4b, 0x73, 0xfc, 0x0b, 0x96, 0x24, 0x41, 0x3e, 0x87, 0xda, 0xee, 0xb3, 0x6b,
+	0x42, 0xc9, 0x59, 0xc8, 0x22, 0x3a, 0xcc, 0xd8, 0x78, 0x83, 0xcc, 0xc9, 0x84, 0xfe, 0xc3, 0x22,
+	0xa0, 0x79, 0x2c, 0x32, 0x40, 0xc9, 0xe5, 0x4e, 0x37, 0xd2, 0x91, 0xdd, 0x20, 0x13, 0x27, 0xb3,
+	0x1d, 0xa5, 0x0e, 0x4b, 0xdc, 0x9f, 0xcd, 0x05, 0x62, 0xb0, 0xc6, 0xa9, 0x08, 0xdd, 0x59, 0x61,
+	0x29, 0x32, 0xd4, 0x83, 0x3f, 0x14, 0xaa, 0x81, 0xa5, 0xad, 0x42, 0x89, 0xad, 0xf2, 0xbc, 0x4c,
+	0xff, 0x1c, 0xd0, 0x3c, 0xe8, 0x77, 0x95, 0xd2, 0x87, 0x12, 0xa8, 0xe9, 0x70, 0x8f, 0x76, 0xa1,
+	0x22, 0xa2, 0x57, 0x99, 0xf4, 0x83, 0xfb, 0xd7, 0x1c, 0x5b, 0xbe, 0x5c, 0x1c, 0x43, 0x51, 0x23,
+	0xc9, 0x71, 0x7c, 0xa9, 0xdb, 0x37, 0xbc, 0xcf, 0x24, 0xc9, 0x6d, 0xa8, 0xd1, 0x59, 0xdc, 0x32,
+	0x8d, 0xd7, 0x8f, 0x76, 0xb9, 0x0c, 0xe1, 0x3c, 0xed, 0x48, 0x51, 0xab, 0xda, 0xd2, 0x91, 0xa2,
+	0x2e, 0x69, 0x6a, 0x6b, 0xef, 0xab, 0x4f, 0x6c, 0x96, 0x4d, 0x2e, 0x06, 0xe3, 0x76, 0x23, 0xf7,
+	0xeb, 0xe5, 0xf8, 0x63, 0x4e, 0xe2, 0x7f, 0xad, 0x86, 0xcd, 0x1a, 0x05, 0x3f, 0xc3, 0xaa, 0x94,
+	0xff, 0xf7, 0xd7, 0x00, 0x00, 0x00, 0xff, 0xff, 0xd5, 0x85, 0x2d, 0xd5, 0xfa, 0x0d, 0x00, 0x00,
 }
diff --git a/src/test_platform/request.proto b/src/test_platform/request.proto
index 36b9d53..15a6744 100644
--- a/src/test_platform/request.proto
+++ b/src/test_platform/request.proto
@@ -170,16 +170,10 @@
 
     Decorations decorations = 8;
 
+
     // Migrations defines parameters that facilitate gradual migrations between
     // different implementations of downstream components.
     message Migrations {
-      // If true, schedule individual tests via buildbucket and run them via
-      // test_runner recipe.
-      // Otherwise, schedule individual tests via raw swarming calls and run
-      // them via skylab_swarming_worker.
-      // TODO(crbug/1033287): remove when migration is complete.
-      bool use_test_runner = 1;
-
       // If true, test tasks will perform synchronous offload of the contents
       // of $SYNCHRONOUS_OFFLOAD_DIR to a GS bucket. This requires
       // use_test_runner to also be set to true: if use_test_runner is set to
@@ -192,6 +186,9 @@
       // Not intended as a long-term change, but useful for testing synchronous
       // offloads during rollout.
       bool notificationless_offload = 3;
+
+      reserved "use_test_runner";
+      reserved 1;
     }
 
     Migrations migrations = 12;