diff --git a/agentrun/integration/builtin/sandbox.py b/agentrun/integration/builtin/sandbox.py
index fc0b328..24bce64 100644
--- a/agentrun/integration/builtin/sandbox.py
+++ b/agentrun/integration/builtin/sandbox.py
@@ -751,20 +751,26 @@ def _get_playwright(self, sb: BrowserSandbox) -> "BrowserPlaywrightSync":
         Automatically recreates the connection when the thread that created it has exited,
         because Playwright's internal greenlet is bound to the thread that created it.
         """
-        if self._playwright_sync is not None and self._playwright_thread is not None:
+        if (
+            self._playwright_sync is not None
+            and self._playwright_thread is not None
+        ):
             current_thread = threading.current_thread()
             creator_thread = self._playwright_thread
-            if not creator_thread.is_alive() or current_thread is not creator_thread:
+            if (
+                not creator_thread.is_alive()
+                or current_thread is not creator_thread
+            ):
                 if not creator_thread.is_alive():
                     logger.debug(
-                        "Playwright creating thread (id=%s) has exited, recreating"
-                        " connection",
+                        "Playwright creating thread (id=%s) has exited,"
+                        " recreating connection",
                         creator_thread.ident,
                     )
                 else:
                     logger.debug(
-                        "Playwright creating thread (id=%s) differs from current"
-                        " thread (id=%s), recreating connection",
+                        "Playwright creating thread (id=%s) differs from"
+                        " current thread (id=%s), recreating connection",
                         creator_thread.ident,
                         current_thread.ident,
                     )
@@ -970,7 +976,7 @@ def goto(self, url: str) -> Dict[str, Any]:
     )
     def browser_navigate_back(
         self,
-        wait_until: str = "load",
+        wait_until: str = "domcontentloaded",
         timeout: Optional[float] = None,
     ) -> Dict[str, Any]:
         """返回上一页 / Go back to previous page"""
@@ -996,7 +1002,7 @@ def inner(sb: Sandbox):
     )
     def browser_go_forward(
         self,
-        wait_until: str = "load",
+        wait_until: str = "domcontentloaded",
         timeout: Optional[float] = None,
     ) -> Dict[str, Any]:
         """前进到下一页 / Go forward to next page"""
diff --git a/tests/unittests/integration/test_browser_toolset_error_handling.py b/tests/unittests/integration/test_browser_toolset_error_handling.py
index a0e3924..16079c9 100644
--- a/tests/unittests/integration/test_browser_toolset_error_handling.py
+++ b/tests/unittests/integration/test_browser_toolset_error_handling.py
@@ -520,3 +520,27 @@ def callback(sb):
         assert "error" in result
         toolset._reset_playwright.assert_not_called()
         assert toolset.sandbox is original_sandbox
+
+
+class TestBrowserNavigationDefaults:
+    """测试导航方法的默认参数 / Tests for default parameters of navigation methods"""
+
+    def test_browser_navigate_back_default_wait_until(self):
+        """browser_navigate_back 的默认 wait_until 为 domcontentloaded"""
+        fields = BrowserToolSet.browser_navigate_back.args_schema.model_fields
+        assert fields["wait_until"].default == "domcontentloaded"
+
+    def test_browser_go_forward_default_wait_until(self):
+        """browser_go_forward 的默认 wait_until 为 domcontentloaded"""
+        fields = BrowserToolSet.browser_go_forward.args_schema.model_fields
+        assert fields["wait_until"].default == "domcontentloaded"
+
+    def test_browser_navigate_back_default_timeout_is_none(self):
+        """browser_navigate_back 的默认 timeout 为 None"""
+        fields = BrowserToolSet.browser_navigate_back.args_schema.model_fields
+        assert fields["timeout"].default is None
+
+    def test_browser_go_forward_default_timeout_is_none(self):
+        """browser_go_forward 的默认 timeout 为 None"""
+        fields = BrowserToolSet.browser_go_forward.args_schema.model_fields
+        assert fields["timeout"].default is None
diff --git a/tests/unittests/integration/test_langchain_agui_integration.py b/tests/unittests/integration/test_langchain_agui_integration.py
index 2e88c16..0f77b50 100644
--- a/tests/unittests/integration/test_langchain_agui_integration.py
+++ b/tests/unittests/integration/test_langchain_agui_integration.py
@@ -639,7 +639,7 @@ async def invoke_agent(request: AgentRequest):
                 tools=tools,
             )
 
-            input_data = {
+            input_data: Any = {
                 "messages": [{
                     "role": "user",
                     "content": (