fix cut message

src/agent/custom_massage_manager.py

@@ -95,7 +95,7 @@ class CustomMassageManager(MessageManager):
         """Get current message list, potentially trimmed to max tokens"""
         diff = self.history.total_tokens - self.max_input_tokens
         i = 1  # start from 1 to keep system message in history
-        while diff > 0:
+        while diff > 0 and i < len(self.history.messages):
             self.history.remove_message(i)
             diff = self.history.total_tokens - self.max_input_tokens
             i += 1

tests/test_browser_use.py

@@ -249,7 +249,7 @@ async def test_browser_use_custom_v2():
 
     llm = utils.get_llm_model(
         provider="deepseek",
-        model_name="deepseek-chat",
+        model_name="deepseek-reasoner",
         temperature=0.8
     )