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 17883e93d..4c791e640 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
@@ -4860,6 +4860,38 @@ mod tests {
 
     #[test]
     fn non_text_field_values_report_a_type_error_instead_of_an_empty_value() {
+        let trailing_newline = match resource_generation_input(&json!({
+            "kind": "video",
+            "mode": "create",
+            "prompt": "生成过场\n",
+            "assetName": "开场"
+        })) {
+            Ok(_) => panic!("落在首尾的控制字符不能被 trim 静默吞掉"),
+            Err(error) => error.to_user_msg(),
+        };
+        assert!(
+            trailing_newline.contains("prompt 含有控制字符"),
+            "{trailing_newline}"
+        );
+
+        let whitespace_only =
+            required_text(&json!({ "brief": "\n\t" }), PrepareGameArtTextField::Brief)
+                .expect_err("纯空白仍然按空值处理")
+                .to_user_msg();
+        assert!(
+            whitespace_only.contains("brief 不能为空"),
+            "{whitespace_only}"
+        );
+
+        assert_eq!(
+            required_text(
+                &json!({ "brief": "  美术包  " }),
+                PrepareGameArtTextField::Brief
+            )
+            .expect("首尾普通空格仍正常裁剪"),
+            "美术包"
+        );
+
         let prompt_not_text = match resource_generation_input(&json!({
             "kind": "video",
             "mode": "create",
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 1460a49ea..67c29cbcb 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
@@ -37,17 +37,19 @@ 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 value = value.trim();
-    if value.is_empty() {
+    let trimmed = value.trim();
+    if trimmed.is_empty() {
         return Err(field.empty());
     }
-    if value.chars().count() > field.max_chars() {
-        return Err(field.too_long(value.chars().count(), field.max_chars()));
-    }
+    // 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().any(char::is_control) {
         return Err(field.has_control_characters());
     }
-    Ok(Some(value.to_string()))
+    if trimmed.chars().count() > field.max_chars() {
+        return Err(field.too_long(trimmed.chars().count(), field.max_chars()));
+    }
+    Ok(Some(trimmed.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。