diff --git a/engine/engine.pb.go b/engine/engine.pb.go
index 630502e..25414da 100644
--- a/engine/engine.pb.go
+++ b/engine/engine.pb.go
@@ -28,6 +28,7 @@ type InitRequest struct {
 
 	Meta       map[string]*any1.Any `protobuf:"bytes,1,rep,name=meta,proto3" json:"meta,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	WorkingDir string               `protobuf:"bytes,2,opt,name=working_dir,json=workingDir,proto3" json:"working_dir,omitempty"`
+	EnvVars    map[string]string    `protobuf:"bytes,3,rep,name=env_vars,json=envVars,proto3" json:"env_vars,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *InitRequest) Reset() {
@@ -76,6 +77,13 @@ func (x *InitRequest) GetWorkingDir() string {
 	return ""
 }
 
+func (x *InitRequest) GetEnvVars() map[string]string {
+	if x != nil {
+		return x.EnvVars
+	}
+	return nil
+}
+
 type InitResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -146,6 +154,7 @@ type ShutdownRequest struct {
 
 	Meta       map[string]*any1.Any `protobuf:"bytes,1,rep,name=meta,proto3" json:"meta,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	WorkingDir string               `protobuf:"bytes,2,opt,name=working_dir,json=workingDir,proto3" json:"working_dir,omitempty"`
+	EnvVars    map[string]string    `protobuf:"bytes,3,rep,name=env_vars,json=envVars,proto3" json:"env_vars,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *ShutdownRequest) Reset() {
@@ -194,6 +203,13 @@ func (x *ShutdownRequest) GetWorkingDir() string {
 	return ""
 }
 
+func (x *ShutdownRequest) GetEnvVars() map[string]string {
+	if x != nil {
+		return x.EnvVars
+	}
+	return nil
+}
+
 type ShutdownResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -413,86 +429,101 @@ var file_engine_engine_proto_rawDesc = []byte{
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+	0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -507,7 +538,7 @@ func file_engine_engine_proto_rawDescGZIP() []byte {
 	return file_engine_engine_proto_rawDescData
 }
 
-var file_engine_engine_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
+var file_engine_engine_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_engine_engine_proto_goTypes = []any{
 	(*InitRequest)(nil),      // 0: engine.InitRequest
 	(*InitResponse)(nil),     // 1: engine.InitResponse
@@ -516,30 +547,34 @@ var file_engine_engine_proto_goTypes = []any{
 	(*RunRequest)(nil),       // 4: engine.RunRequest
 	(*RunResponse)(nil),      // 5: engine.RunResponse
 	nil,                      // 6: engine.InitRequest.MetaEntry
-	nil,                      // 7: engine.ShutdownRequest.MetaEntry
-	nil,                      // 8: engine.RunRequest.MetaEntry
-	nil,                      // 9: engine.RunRequest.EnvVarsEntry
-	(*any1.Any)(nil),         // 10: google.protobuf.Any
+	nil,                      // 7: engine.InitRequest.EnvVarsEntry
+	nil,                      // 8: engine.ShutdownRequest.MetaEntry
+	nil,                      // 9: engine.ShutdownRequest.EnvVarsEntry
+	nil,                      // 10: engine.RunRequest.MetaEntry
+	nil,                      // 11: engine.RunRequest.EnvVarsEntry
+	(*any1.Any)(nil),         // 12: google.protobuf.Any
 }
 var file_engine_engine_proto_depIdxs = []int32{
 	6,  // 0: engine.InitRequest.meta:type_name -> engine.InitRequest.MetaEntry
-	7,  // 1: engine.ShutdownRequest.meta:type_name -> engine.ShutdownRequest.MetaEntry
-	8,  // 2: engine.RunRequest.meta:type_name -> engine.RunRequest.MetaEntry
-	9,  // 3: engine.RunRequest.env_vars:type_name -> engine.RunRequest.EnvVarsEntry
-	10, // 4: engine.InitRequest.MetaEntry.value:type_name -> google.protobuf.Any
-	10, // 5: engine.ShutdownRequest.MetaEntry.value:type_name -> google.protobuf.Any
-	10, // 6: engine.RunRequest.MetaEntry.value:type_name -> google.protobuf.Any
-	0,  // 7: engine.CommandExecutor.Init:input_type -> engine.InitRequest
-	4,  // 8: engine.CommandExecutor.Run:input_type -> engine.RunRequest
-	2,  // 9: engine.CommandExecutor.Shutdown:input_type -> engine.ShutdownRequest
-	1,  // 10: engine.CommandExecutor.Init:output_type -> engine.InitResponse
-	5,  // 11: engine.CommandExecutor.Run:output_type -> engine.RunResponse
-	3,  // 12: engine.CommandExecutor.Shutdown:output_type -> engine.ShutdownResponse
-	10, // [10:13] is the sub-list for method output_type
-	7,  // [7:10] is the sub-list for method input_type
-	7,  // [7:7] is the sub-list for extension type_name
-	7,  // [7:7] is the sub-list for extension extendee
-	0,  // [0:7] is the sub-list for field type_name
+	7,  // 1: engine.InitRequest.env_vars:type_name -> engine.InitRequest.EnvVarsEntry
+	8,  // 2: engine.ShutdownRequest.meta:type_name -> engine.ShutdownRequest.MetaEntry
+	9,  // 3: engine.ShutdownRequest.env_vars:type_name -> engine.ShutdownRequest.EnvVarsEntry
+	10, // 4: engine.RunRequest.meta:type_name -> engine.RunRequest.MetaEntry
+	11, // 5: engine.RunRequest.env_vars:type_name -> engine.RunRequest.EnvVarsEntry
+	12, // 6: engine.InitRequest.MetaEntry.value:type_name -> google.protobuf.Any
+	12, // 7: engine.ShutdownRequest.MetaEntry.value:type_name -> google.protobuf.Any
+	12, // 8: engine.RunRequest.MetaEntry.value:type_name -> google.protobuf.Any
+	0,  // 9: engine.CommandExecutor.Init:input_type -> engine.InitRequest
+	4,  // 10: engine.CommandExecutor.Run:input_type -> engine.RunRequest
+	2,  // 11: engine.CommandExecutor.Shutdown:input_type -> engine.ShutdownRequest
+	1,  // 12: engine.CommandExecutor.Init:output_type -> engine.InitResponse
+	5,  // 13: engine.CommandExecutor.Run:output_type -> engine.RunResponse
+	3,  // 14: engine.CommandExecutor.Shutdown:output_type -> engine.ShutdownResponse
+	12, // [12:15] is the sub-list for method output_type
+	9,  // [9:12] is the sub-list for method input_type
+	9,  // [9:9] is the sub-list for extension type_name
+	9,  // [9:9] is the sub-list for extension extendee
+	0,  // [0:9] is the sub-list for field type_name
 }
 
 func init() { file_engine_engine_proto_init() }
@@ -627,7 +662,7 @@ func file_engine_engine_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_engine_engine_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   10,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/engine/engine.proto b/engine/engine.proto
index 5e8ecca..f72fba9 100644
--- a/engine/engine.proto
+++ b/engine/engine.proto
@@ -13,6 +13,7 @@ service CommandExecutor {
 message InitRequest {
   map<string, google.protobuf.Any> meta = 1;
   string working_dir = 2;
+  map<string, string> env_vars = 3;
 }
 
 message InitResponse {
@@ -24,6 +25,7 @@ message InitResponse {
 message ShutdownRequest {
   map<string, google.protobuf.Any> meta = 1;
   string working_dir = 2;
+  map<string, string> env_vars = 3;
 }
 
 message ShutdownResponse {