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 d69dc5e20..7d5bacb99 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
@@ -1718,6 +1718,7 @@ fn bridge_file_content_changed(root: &Path, path: &str, content: &[u8]) -> Optio
 pub(in crate::agent) fn write_file_input(
     arguments: &Value,
 ) -> Result<(String, String), WriteFileError> {
+    ToolArgumentsRejection::check(arguments, &["path", "content"])?;
     let raw_path = arguments
         .get("path")
         .and_then(Value::as_str)
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
index f8774f2df..61e78b727 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
@@ -2849,6 +2849,12 @@ mod tests {
             "content": "{}"
         }))
         .is_err());
+        assert!(validate_write_file_arguments(&json!({
+            "path": "game/index.html",
+            "content": "<html></html>",
+            "unexpected": 1
+        }))
+        .is_err());
         assert_eq!(
             direct_tool_bridge::prepare_game_art_input(&json!({ "brief": "美术包" }))
                 .expect("safe default")