diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
index 00940673a..d35ae9383 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
@@ -4898,18 +4898,30 @@ mod tests {
             GameCreationAppAssetKind::Image
         );
 
-        let trailing_newline = match resource_generation_input(&json!({
+        assert_eq!(
+            resource_generation_input(&json!({
+                "kind": "video",
+                "mode": "create",
+                "prompt": "生成过场\n",
+                "assetName": "开场"
+            }))
+            .expect("首尾换行按普通空白裁掉，不能报控制字符")
+            .prompt,
+            "生成过场"
+        );
+
+        let interior_newline = match resource_generation_input(&json!({
             "kind": "video",
             "mode": "create",
-            "prompt": "生成过场\n",
+            "prompt": "生成\n过场",
             "assetName": "开场"
         })) {
-            Ok(_) => panic!("落在首尾的控制字符不能被 trim 静默吞掉"),
+            Ok(_) => panic!("中间的控制字符仍必须被拒绝"),
             Err(error) => error.to_user_msg(),
         };
         assert!(
-            trailing_newline.contains("prompt 含有控制字符"),
-            "{trailing_newline}"
+            interior_newline.contains("prompt 含有控制字符"),
+            "{interior_newline}"
         );
 
         let whitespace_only =
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/tool/arguments.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/tool/arguments.rs
index 67c29cbcb..1460a49ea 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/tool/arguments.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/tool/arguments.rs
@@ -37,19 +37,17 @@ pub(crate) fn optional_text<F: ToolTextField<E>, E>(
     let Some(value) = value.as_str() else {
         return Err(field.not_text(value.to_string()));
     };
-    let trimmed = value.trim();
-    if trimmed.is_empty() {
+    let value = value.trim();
+    if value.is_empty() {
         return Err(field.empty());
     }
-    // 控制字符必须按原串判定：否则落在首尾的 `\n`/`\t` 会被 trim 静默吞掉，
-    // 同一个字符在中间报错、在边上通过。
+    if value.chars().count() > field.max_chars() {
+        return Err(field.too_long(value.chars().count(), field.max_chars()));
+    }
     if value.chars().any(char::is_control) {
         return Err(field.has_control_characters());
     }
-    if trimmed.chars().count() > field.max_chars() {
-        return Err(field.too_long(trimmed.chars().count(), field.max_chars()));
-    }
-    Ok(Some(trimmed.to_string()))
+    Ok(Some(value.to_string()))
 }
 
 /// 一页列表结果：`offset` 是起始下标，`limit` 是这一次最多返回多少项。