Merge branch 'feature/agent-final-answer-first-char' into staging

agent/logging_handler.py

@@ -1,6 +1,7 @@
 """Logging callback handler module."""
 
 import logging
+import traceback
 from typing import Any, Optional, Dict, List
 from langchain_core.callbacks import BaseCallbackHandler
 from langchain_core.messages import BaseMessage
@@ -80,4 +81,8 @@ class LoggingCallbackHandler(BaseCallbackHandler):
         self, error: Exception, **kwargs: Any
     ) -> None:
         """Called when a tool invocation raises an error."""
-        self.logger.error(f"❌ Tool Error: {error}")
+        self.logger.error(
+            "❌ Tool Error: %s\n%s",
+            repr(error),
+            "".join(traceback.format_exception(type(error), error, error.__traceback__)),
+        )

agent/mcp_trace_meta.py

@@ -78,6 +78,7 @@ async def _call_tool_with_meta_compat(self: ClientSession, *args: Any, **kwargs:
     result = await self.send_request(
         types.ClientRequest(
             types.CallToolRequest(
+                method="tools/call",
                 params=types.CallToolRequestParams(
                     name=name,
                     arguments=arguments,

routes/chat.py

@@ -3,6 +3,7 @@ import os
 import asyncio
 import shutil
 import time
+import traceback
 from typing import Union, Optional, Any, List, Dict
 from fastapi import APIRouter, HTTPException, Header, Body
 from fastapi.responses import StreamingResponse
@@ -185,9 +186,11 @@ async def enhanced_generate_stream_response(
                 await output_queue.put(("agent_done", None))
 
             except Exception as e:
-                logger.error(f"Error in agent task: {e}")
+                logger.error(f"Error in agent task: {e}\n{traceback.format_exc()}")
                 # Send error information to the client
-                await output_queue.put(("agent", f'data: {{"error": "{str(e)}"}}\n\n'))
+                await output_queue.put(
+                    ("agent", f"data: {json.dumps({'error': str(e)}, ensure_ascii=False)}\n\n")
+                )
                 # Send completion signal to ensure the output controller exits normally
                 await output_queue.put(("agent_done", None))