Fixed context usage calculation

test/web_agent_test.py

@@ -60,13 +60,15 @@ class WebAgentTest(unittest.TestCase):
             yield "<reasoning>test reasoning</reasoning>"
             
         self.mock_llm.infer.side_effect = mock_infer
+        self.mock_llm.token_count.return_value = 100
+        self.mock_llm.token_limit.return_value = 1000
         
         # Create agent with all components
         self.agent = WebAgent(
             system_prompt="test prompt",
             action_schema="test schema",
             working_memory=self.working_memory,
-            system_metrics=self.mock_metrics,
+            metrics=self.mock_metrics,
             llm=self.mock_llm,
             validator=self.mock_validator,
             parser=self.parser