diff --git a/source/MaaAdbControlUnit/Input/MaatouchInput.cpp b/source/MaaAdbControlUnit/Input/MaatouchInput.cpp
index 6acc0db88..0785e0071 100644
--- a/source/MaaAdbControlUnit/Input/MaatouchInput.cpp
+++ b/source/MaaAdbControlUnit/Input/MaatouchInput.cpp
@@ -56,8 +56,12 @@ bool MaatouchInput::press_key(int key)
         return false;
     }
 
-    bool ret = shell_handler_->write(MAA_FMT::format("k {} d\nc\n", key)) &&
-               shell_handler_->write(MAA_FMT::format("k {} u\nc\n", key));
+    // https://github.com/openstf/minitouch#writable-to-the-socket
+    static constexpr std::string_view kKeyDownFormat = "k {} d\nc\n";
+    static constexpr std::string_view kKeyUpFormat = "k {} u\nc\n";
+
+    bool ret = shell_handler_->write(MAA_FMT::format(kKeyDownFormat, key)) &&
+               shell_handler_->write(MAA_FMT::format(kKeyUpFormat, key));
 
     if (!ret) {
         LogError << "failed to write";
diff --git a/source/MaaAdbControlUnit/Input/MinitouchInput.cpp b/source/MaaAdbControlUnit/Input/MinitouchInput.cpp
index b73a4765b..b5851dbdb 100644
--- a/source/MaaAdbControlUnit/Input/MinitouchInput.cpp
+++ b/source/MaaAdbControlUnit/Input/MinitouchInput.cpp
@@ -61,7 +61,9 @@ bool MinitouchInput::set_wh(int swidth, int sheight, int orientation)
 {
     LogFunc << VAR(swidth) << VAR(sheight) << VAR(orientation);
 
-    shell_handler_ = invoke_app_->invoke_bin("-i");
+    // https://github.com/openstf/minitouch#running
+    static const std::string kMinitouchUseStdin = "-i";
+    shell_handler_ = invoke_app_->invoke_bin(kMinitouchUseStdin);
     if (!shell_handler_) {
         return false;
     }
diff --git a/source/MaaAdbControlUnit/Input/MtouchHelper.cpp b/source/MaaAdbControlUnit/Input/MtouchHelper.cpp
index 48d4b1c02..8f006c51f 100644
--- a/source/MaaAdbControlUnit/Input/MtouchHelper.cpp
+++ b/source/MaaAdbControlUnit/Input/MtouchHelper.cpp
@@ -91,8 +91,8 @@ bool MtouchHelper::click(int x, int y)
 
     LogInfo << VAR(x) << VAR(y) << VAR(touch_x) << VAR(touch_y);
 
-    bool ret = shell_handler_->write(MAA_FMT::format("d {} {} {} {}\nc\n", 0, touch_x, touch_y, press_)) &&
-               shell_handler_->write(MAA_FMT::format("u {}\nc\n", 0));
+    bool ret = shell_handler_->write(MAA_FMT::format(kDownFormat, 0, touch_x, touch_y, press_)) &&
+               shell_handler_->write(MAA_FMT::format(kUpFormat, 0));
 
     if (!ret) {
         LogError << "failed to write";
@@ -130,7 +130,7 @@ bool MtouchHelper::swipe(int x1, int y1, int x2, int y2, int duration)
     auto start = std::chrono::steady_clock::now();
     auto now = start;
     bool ret = true;
-    ret &= shell_handler_->write(MAA_FMT::format("d {} {} {} {}\nc\n", 0, touch_x1, touch_y1, press_));
+    ret &= shell_handler_->write(MAA_FMT::format(kDownFormat, 0, touch_x1, touch_y1, press_));
     if (!ret) {
         LogError << "write error";
         return false;
@@ -147,7 +147,7 @@ bool MtouchHelper::swipe(int x1, int y1, int x2, int y2, int duration)
         std::this_thread::sleep_until(now + delay);
         now = std::chrono::steady_clock::now();
 
-        ret &= shell_handler_->write(MAA_FMT::format("m {} {} {} {}\nc\n", 0, tx, ty, press_));
+        ret &= shell_handler_->write(MAA_FMT::format(kMoveFormat, 0, tx, ty, press_));
         if (!ret) {
             LogWarn << "write error";
         }
@@ -155,11 +155,11 @@ bool MtouchHelper::swipe(int x1, int y1, int x2, int y2, int duration)
 
     std::this_thread::sleep_until(now + delay);
     now = std::chrono::steady_clock::now();
-    ret &= shell_handler_->write(MAA_FMT::format("m {} {} {} {}\nc\n", 0, touch_x2, touch_y2, press_));
+    ret &= shell_handler_->write(MAA_FMT::format(kMoveFormat, 0, touch_x2, touch_y2, press_));
 
     std::this_thread::sleep_until(now + delay);
     now = std::chrono::steady_clock::now();
-    ret &= shell_handler_->write(MAA_FMT::format("u {}\nc\n", 0));
+    ret &= shell_handler_->write(MAA_FMT::format(kUpFormat, 0));
 
     if (!ret) {
         LogError << "failed to write";
@@ -180,7 +180,7 @@ bool MtouchHelper::touch_down(int contact, int x, int y, int pressure)
 
     LogInfo << VAR(contact) << VAR(x) << VAR(y) << VAR(touch_x) << VAR(touch_y);
 
-    bool ret = shell_handler_->write(MAA_FMT::format("d {} {} {} {}\nc\n", contact, touch_x, touch_y, pressure));
+    bool ret = shell_handler_->write(MAA_FMT::format(kDownFormat, contact, touch_x, touch_y, pressure));
 
     if (!ret) {
         LogError << "failed to write";
@@ -201,7 +201,7 @@ bool MtouchHelper::touch_move(int contact, int x, int y, int pressure)
 
     LogInfo << VAR(contact) << VAR(x) << VAR(y) << VAR(touch_x) << VAR(touch_y);
 
-    bool ret = shell_handler_->write(MAA_FMT::format("m {} {} {} {}\nc\n", contact, touch_x, touch_y, pressure));
+    bool ret = shell_handler_->write(MAA_FMT::format(kMoveFormat, contact, touch_x, touch_y, pressure));
 
     if (!ret) {
         LogError << "failed to write";
@@ -220,7 +220,7 @@ bool MtouchHelper::touch_up(int contact)
 
     LogInfo << VAR(contact);
 
-    bool ret = shell_handler_->write(MAA_FMT::format("u {}\nc\n", contact));
+    bool ret = shell_handler_->write(MAA_FMT::format(kUpFormat, contact));
 
     if (!ret) {
         LogError << "failed to write";
diff --git a/source/MaaAdbControlUnit/Input/MtouchHelper.h b/source/MaaAdbControlUnit/Input/MtouchHelper.h
index 0ee1b3b25..fd86eb91b 100644
--- a/source/MaaAdbControlUnit/Input/MtouchHelper.h
+++ b/source/MaaAdbControlUnit/Input/MtouchHelper.h
@@ -24,6 +24,11 @@ class MtouchHelper : public TouchInputBase
     virtual std::pair<int, int> screen_to_touch(int x, int y) = 0;
     virtual std::pair<int, int> screen_to_touch(double x, double y) = 0;
 
+    // https://github.com/openstf/minitouch#writable-to-the-socket
+    static constexpr std::string_view kDownFormat = "d {} {} {} {}\nc\n";
+    static constexpr std::string_view kMoveFormat = "m {} {} {} {}\nc\n";
+    static constexpr std::string_view kUpFormat = "u {}\nc\n";
+
     std::shared_ptr<IOHandler> shell_handler_ = nullptr;
 
     int screen_width_ = 0;