Add HOST_PROMPT_SUPPORT (#13039)

Marlin/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/HAL/HAL_LPC1768/MarlinSerial.h

       emergency_parser.update(emergency_state, c);
       return true; // do not discard character
     }
-  #endif
 
-  #if ENABLED(EMERGENCY_PARSER)
     EmergencyParser::State emergency_state;
   #endif
 };

Marlin/src/Marlin.cpp

 #include "gcode/parser.h"
 #include "gcode/queue.h"
 
+#if ENABLED(HOST_ACTION_COMMANDS)
+  #include "feature/host_actions.h"
+#endif
+
 #if HAS_BUZZER && DISABLED(LCD_USE_I2C_BUZZER)
   #include "libs/buzzer.h"
 #endif
   disable_e_steppers();
 }
 
-#if HAS_ACTION_COMMANDS
+#if ENABLED(FILAMENT_RUNOUT_SENSOR)
+
+  void event_filament_runout() {
+
+    #if ENABLED(ADVANCED_PAUSE_FEATURE)
+      if (did_pause_print) return;  // Action already in progress. Purge triggered repeated runout.
+    #endif
+
+    #if ENABLED(EXTENSIBLE_UI)
+      ExtUI::onFilamentRunout(ExtUI::getActiveTool());
+    #endif
+
+    const char tool = '0'
+      #if NUM_RUNOUT_SENSORS > 1
+        + active_extruder
+      #endif
+    ;
+
+    //action:out_of_filament
+    #if ENABLED(HOST_PROMPT_SUPPORT)
+      host_prompt_reason = PROMPT_FILAMENT_RUNOUT;
+      host_action_prompt_end();
+      host_action_prompt_begin(PSTR("FilamentRunout T"), false);
+      SERIAL_CHAR(tool);
+      SERIAL_EOL();
+      host_action_prompt_show();
+    #endif
+
+    #if ENABLED(HOST_ACTION_COMMANDS)
+      if (!runout.host_handling
+        && ( strstr(FILAMENT_RUNOUT_SCRIPT, "M600")
+          || strstr(FILAMENT_RUNOUT_SCRIPT, "M125")
+          #if ENABLED(ADVANCED_PAUSE_FEATURE)
+            || strstr(FILAMENT_RUNOUT_SCRIPT, "M25")
+          #endif
+        )
+      ) {
+        host_action_paused(false);
+      }
+      else {
+        // Legacy Repetier command for use until newer version supports standard dialog
+        // To be removed later when pause command also triggers dialog
+        #ifdef ACTION_ON_FILAMENT_RUNOUT
+          host_action(PSTR(ACTION_ON_FILAMENT_RUNOUT " T"), false);
+          SERIAL_CHAR(tool);
+          SERIAL_EOL();
+        #endif
+
+        host_action_pause(false);
+      }
+      SERIAL_ECHOPGM(" " ACTION_REASON_ON_FILAMENT_RUNOUT " ");
+      SERIAL_CHAR(tool);
+      SERIAL_EOL();
 
-  void host_action(const char * const pstr, const bool eol=true) {
-    SERIAL_ECHOPGM("//action:");
-    serialprintPGM(pstr);
-    if (eol) SERIAL_EOL();
+    #endif // HOST_ACTION_COMMANDS
+
+    if (!runout.host_handling)
+      enqueue_and_echo_commands_P(PSTR(FILAMENT_RUNOUT_SCRIPT));
   }
 
-  #ifdef ACTION_ON_KILL
-    void host_action_kill() { host_action(PSTR(ACTION_ON_KILL)); }
-  #endif
-  #ifdef ACTION_ON_PAUSE
-    void host_action_pause() { host_action(PSTR(ACTION_ON_PAUSE)); }
-  #endif
-  #ifdef ACTION_ON_PAUSED
-    void host_action_paused() { host_action(PSTR(ACTION_ON_PAUSED)); }
-  #endif
-  #ifdef ACTION_ON_RESUME
-    void host_action_resume() { host_action(PSTR(ACTION_ON_RESUME)); }
-  #endif
-  #ifdef ACTION_ON_RESUMED
-    void host_action_resumed() { host_action(PSTR(ACTION_ON_RESUMED)); }
-  #endif
-  #ifdef ACTION_ON_CANCEL
-    void host_action_cancel() { host_action(PSTR(ACTION_ON_CANCEL)); }
-  #endif
-  #ifdef ACTION_ON_FILAMENT_RUNOUT
-    void host_action_filament_runout(const bool eol/*=true*/) { host_action(PSTR(ACTION_ON_FILAMENT_RUNOUT), eol); }
-  #endif
+#endif // FILAMENT_RUNOUT_SENSOR
+
+#if ENABLED(G29_RETRY_AND_RECOVER)
+
+  void event_probe_failure() {
+    #ifdef G29_FAILURE_COMMANDS
+      process_subcommands_now_P(PSTR(G29_FAILURE_COMMANDS));
+    #endif
+    #ifdef ACTION_ON_G29_FAILURE
+      host_action(PSTR(ACTION_ON_G29_FAILURE)); }
+    #endif
+    #if ENABLED(G29_HALT_ON_FAILURE)
+      #ifdef ACTION_ON_CANCEL
+        host_action_cancel();
+      #endif
+      kill(PSTR(MSG_ERR_PROBING_FAILED));
+    #endif
+  }
+
+  void event_probe_recover() {
+    #if ENABLED(HOST_PROMPT_SUPPORT)
+      host_prompt_do(PROMPT_INFO, PSTR("G29 Retrying"));
+    #endif
+    #ifdef G29_RECOVER_COMMANDS
+      process_subcommands_now_P(PSTR(G29_RECOVER_COMMANDS));
+    #endif
+    #ifdef ACTION_ON_G29_RECOVER
+      host_action(PSTR(ACTION_ON_G29_RECOVER));
+    #endif
+  }
 
-#endif // HAS_ACTION_COMMANDS
+#endif
 
 /**
  * Manage several activities:

Marlin/src/Marlin.h

   inline void suicide() { OUT_WRITE(SUICIDE_PIN, LOW); }
 #endif
 
-#if HAS_ACTION_COMMANDS
-  #ifdef ACTION_ON_KILL
-    void host_action_kill();
-  #endif
-  #ifdef ACTION_ON_PAUSE
-    void host_action_pause();
-  #endif
-  #ifdef ACTION_ON_PAUSED
-    void host_action_paused();
-  #endif
-  #ifdef ACTION_ON_RESUME
-    void host_action_resume();
-  #endif
-  #ifdef ACTION_ON_RESUMED
-    void host_action_resumed();
-  #endif
-  #ifdef ACTION_ON_CANCEL
-    void host_action_cancel();
-  #endif
-  #ifdef ACTION_ON_FILAMENT_RUNOUT
-    void host_action_filament_runout(const bool eol=true);
-  #endif
+#if ENABLED(FILAMENT_RUNOUT_SENSOR)
+  void event_filament_runout();
+#endif
+
+#if ENABLED(G29_RETRY_AND_RECOVER)
+  void event_probe_recover();
+  void event_probe_failure();
 #endif

Marlin/src/config/default/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/default/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/3DFabXYZ/Migbot/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/3DFabXYZ/Migbot/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/AlephObjects/TAZ4/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/AliExpress/CL-260/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Anet/A2/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Anet/A2/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Anet/A2plus/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Anet/A2plus/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Anet/A6/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Anet/A6/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Anet/A8/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Anet/A8/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/AnyCubic/i3/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/AnyCubic/i3/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/ArmEd/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/ArmEd/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Azteeg/X5GT/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BIBO/TouchX/default/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/BQ/Hephestos/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BQ/Hephestos/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h

   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BQ/Hephestos_2/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/BQ/WITBOX/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/BQ/WITBOX/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Cartesio/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Cartesio/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/CR-10/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/CR-10/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/CR-10S/Configuration.h

   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
   #define FIL_RUNOUT_PIN 2 // Creality CR10-S stock sensor
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/CR-10S/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/CR-10mini/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/CR-10mini/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/CR-8/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/CR-8/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/Ender-2/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/Ender-2/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/Ender-3/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/Ender-3/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Creality/Ender-4/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Creality/Ender-4/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Einstart-S/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Einstart-S/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Felix/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Felix/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Felix/DUAL/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/FlashForge/CreatorPro/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/FlashForge/CreatorPro/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/FolgerTech/i3-2020/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Formbot/Raptor/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Formbot/Raptor/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-#define ACTION_ON_PAUSE   "pause"
-#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Formbot/T_Rex_2+/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Formbot/T_Rex_2+/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-#define ACTION_ON_PAUSE   "pause"
-#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Formbot/T_Rex_3/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Formbot/T_Rex_3/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-#define ACTION_ON_PAUSE   "pause"
-#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Geeetech/A10M/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/A10M/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Geeetech/A20M/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/A20M/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Geeetech/GT2560/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/MeCreator2/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/MeCreator2/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/Prusa i3 Pro C/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/Prusa i3 Pro C/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro W/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Geeetech/Prusa i3 Pro W/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Infitary/i3-M508/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Infitary/i3-M508/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/JGAurora/A5/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/JGAurora/A5/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/MakerParts/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/MakerParts/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Malyan/M150/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Malyan/M150/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Malyan/M200/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Malyan/M200/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Micromake/C1/basic/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Micromake/C1/enhanced/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Mks/Robin/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Mks/Robin/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/Mks/Sbase/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/Mks/Sbase/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================

Marlin/src/config/examples/RapideLite/RL200/Configuration.h

   #define FIL_RUNOUT_PULLUP          // Use internal pullup for filament runout pins.
   //#define FIL_RUNOUT_PULLDOWN      // Use internal pulldown for filament runout pins.
 
-  // Set one or more commands to run on filament runout.
-  //  - Always applies to SD-card printing.
-  //  - Applies to host-based printing if ACTION_ON_FILAMENT_RUNOUT is not set.
+  // Set one or more commands to execute on filament runout.
+  // (After 'M412 H' Marlin will ask the host to handle the process.)
   #define FILAMENT_RUNOUT_SCRIPT "M600"
 
-  // With this option, if filament runs out during host-based printing, Marlin
-  // will send "//action:<ACTION_ON_FILAMENT_RUNOUT>" to the host and let the
-  // host handle filament change. If left undefined the FILAMENT_RUNOUT_SCRIPT
-  // will be used on filament runout for both host-based and SD-card printing.
-  //
-  // The host must be able to respond to the //action: command set here.
-  //
-  //#define ACTION_ON_FILAMENT_RUNOUT "pause: filament_runout"
-
   // After a runout is detected, continue printing this length of filament
   // before executing the runout script. Useful for a sensor at the end of
   // a feed tube. Requires 4 bytes SRAM per sensor, plus 4 bytes overhead.

Marlin/src/config/examples/RapideLite/RL200/Configuration_adv.h

   #define G29_SUCCESS_COMMANDS "M117 Bed leveling done."
   #define G29_RECOVER_COMMANDS "M117 Probe failed. Rewiping.\nG28\nG12 P0 S12 T0"
   #define G29_FAILURE_COMMANDS "M117 Bed leveling failed.\nG0 Z10\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nM300 P25 S880\nM300 P50 S0\nG4 S1"
-  /**
-   * Specify an action command to send to the host on a recovery attempt or failure.
-   * Will be sent in the form '//action:ACTION_ON_G29_FAILURE', e.g. '//action:probe_failed'.
-   * The host must be configured to handle the action command.
-   */
-  #define G29_ACTION_ON_RECOVER "probe_rewipe"
-  #define G29_ACTION_ON_FAILURE "probe_failed"
+
 #endif
 
 // @section extras
 #endif
 
 /**
- * Specify an action command to send to the host when the printer is killed.
- * Will be sent in the form '//action:ACTION_ON_KILL', e.g. '//action:poweroff'.
- * The host must be configured to handle the action command.
- */
-//#define ACTION_ON_KILL "poweroff"
-
-/**
- * Specify an action command to send to the host on pause and resume.
- * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
- * The host must be configured to handle the action command.
+ * Host Action Commands
  *
- *   PAUSE / RESUME : Used in non-parking scenarios where the host handles the
- *                    action while Marlin continues to process G-Code. (M24/M25)
+ * Define host streamer action commands in compliance with the standard.
  *
- * PAUSED / RESUMED : Used in scenarios where Marlin handles pause and filament-
- *                    change actions and the host needs to stop sending commands
- *                    until the machine is ready to resume. (M125/M600)
+ * See https://reprap.org/wiki/G-code#Action_commands
+ * Common commands ........ poweroff, pause, paused, resume, resumed, cancel
+ * G29_RETRY_AND_RECOVER .. probe_rewipe, probe_failed
  *
- *           CANCEL : Instructs the host to abort the print job. Used when the
- *                    print is canceled from the LCD menu.
+ * Some features add reason codes to extend these commands.
+ *
+ * Host Prompt Support enables Marlin to use the host for user prompts so
+ * filament runout and other processes can be managed from the host side.
  */
-//#define ACTION_ON_PAUSE   "pause"
-//#define ACTION_ON_RESUME  "resume"
-//#define ACTION_ON_PAUSED  "paused"
-//#define ACTION_ON_RESUMED "resumed"
-//#define ACTION_ON_CANCEL  "cancel"
+//#define HOST_ACTION_COMMANDS
+#if ENABLED(HOST_ACTION_COMMANDS)
+  //#define HOST_PROMPT_SUPPORT
+#endif
 
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================