diff --git a/public/script.js b/public/script.js
index 001cc72fc..e04a308f8 100644
--- a/public/script.js
+++ b/public/script.js
@@ -174,7 +174,7 @@ import {
     saveBase64AsFile,
     uuidv4,
 } from './scripts/utils.js';
-import { debounce_timeout } from './scripts/constants.js';
+import { debounce_timeout, IGNORE_SYMBOL } from './scripts/constants.js';
 
 import { doDailyExtensionUpdatesCheck, extension_settings, initExtensions, loadExtensionSettings, runGenerationInterceptors, saveMetadataDebounced } from './scripts/extensions.js';
 import { COMMENT_NAME_DEFAULT, executeSlashCommandsOnChatInput, getSlashCommandsHelp, initDefaultSlashCommands, isExecutingCommandsFromChatInput, pauseScriptExecution, processChatSlashCommands, stopScriptExecution } from './scripts/slash-commands.js';
@@ -5301,6 +5301,12 @@ function formatMessageHistoryItem(chatItem, isInstruct, forceOutputSequence) {
     const itemName = chatItem.is_user ? chatItem['name'] : characterName;
     const shouldPrependName = !isNarratorType;
 
+    // If this symbol flag is set, completely ignore the message.
+    // This can be used to hide messages without affecting the number of messages in the chat.
+    if (chatItem.extra?.[IGNORE_SYMBOL]) {
+        return '';
+    }
+
     // Don't include a name if it's empty
     let textResult = chatItem?.name && shouldPrependName ? `${itemName}: ${chatItem.mes}\n` : `${chatItem.mes}\n`;
 
diff --git a/public/scripts/constants.js b/public/scripts/constants.js
index f95a8e146..5cd1a2ff5 100644
--- a/public/scripts/constants.js
+++ b/public/scripts/constants.js
@@ -14,3 +14,11 @@ export const debounce_timeout = {
     /** [5 sec] For delayed tasks, like auto-saving or completing batch operations that need a significant pause. */
     extended: 5000,
 };
+
+/**
+ * Used as an ephemeral key in message extra metadata.
+ * When set, the message will be excluded from generation
+ * prompts without affecting the number of chat messages,
+ * which is needed to preserve world info timed effects.
+ */
+export const IGNORE_SYMBOL = Symbol.for('ignore');
diff --git a/public/scripts/openai.js b/public/scripts/openai.js
index b0c23d3eb..775fad33a 100644
--- a/public/scripts/openai.js
+++ b/public/scripts/openai.js
@@ -75,6 +75,7 @@ import { Popup, POPUP_RESULT } from './popup.js';
 import { t } from './i18n.js';
 import { ToolManager } from './tool-calling.js';
 import { accountStorage } from './util/AccountStorage.js';
+import { IGNORE_SYMBOL } from './constants.js';
 
 export {
     openai_messages_count,
@@ -523,6 +524,13 @@ function setOpenAIMessages(chat) {
         let role = chat[j]['is_user'] ? 'user' : 'assistant';
         let content = chat[j]['mes'];
 
+        // If this symbol flag is set, completely ignore the message.
+        // This can be used to hide messages without affecting the number of messages in the chat.
+        if (chat[j].extra?.[IGNORE_SYMBOL]) {
+            j++;
+            continue;
+        }
+
         // 100% legal way to send a message as system
         if (chat[j].extra?.type === system_message_types.NARRATOR) {
             role = 'system';
diff --git a/public/scripts/st-context.js b/public/scripts/st-context.js
index ae32ff3f8..0ba1104bd 100644
--- a/public/scripts/st-context.js
+++ b/public/scripts/st-context.js
@@ -83,6 +83,7 @@ import { convertCharacterBook, getWorldInfoPrompt, loadWorldInfo, reloadEditor,
 import { ChatCompletionService, TextCompletionService } from './custom-request.js';
 import { ConnectionManagerRequestService } from './extensions/shared.js';
 import { updateReasoningUI, parseReasoningFromString } from './reasoning.js';
+import { IGNORE_SYMBOL } from './constants.js';
 
 export function getContext() {
     return {
@@ -225,6 +226,9 @@ export function getContext() {
         parseReasoningFromString,
         unshallowCharacter,
         unshallowGroupMembers,
+        symbols: {
+            ignore: IGNORE_SYMBOL,
+        },
     };
 }