Log full exception details for Anthropic errors

agent/llm_client.py

@@ -338,9 +338,10 @@ class LLMClient:
             return content
             
         except Exception as e:
-            logger.error(f"Anthropic API error: {e}")
+            err_msg = f"{e} | cause: {repr(getattr(e, '__cause__', ''))}"
+            logger.error(f"Anthropic API error: {err_msg}")
             if monitor:
-                monitor.complete_call(call_id, success=False, error_message=str(e))
+                monitor.complete_call(call_id, success=False, error_message=err_msg)
             # Fallback to OpenAI if available
             if self.openai_key:
                 logger.info("Falling back to OpenAI due to Anthropic error")
@@ -392,9 +393,10 @@ class LLMClient:
                     )
                     
         except Exception as e:
-            logger.error(f"Anthropic streaming error: {e}")
+            err_msg = f"{e} | cause: {repr(getattr(e, '__cause__', ''))}"
+            logger.error(f"Anthropic streaming error: {err_msg}")
             if monitor:
-                monitor.complete_call(call_id, success=False, error_message=str(e))
+                monitor.complete_call(call_id, success=False, error_message=err_msg)
             if self.openai_key:
                 logger.info("Falling back to OpenAI streaming due to Anthropic error")
                 yield from self._stream_openai(messages, temperature, max_tokens)