Add debugging improvements and litellm workaround

- Enhanced logging in agent loop for better debugging
- Added workaround for litellm's os.getcwd() issue when directory is deleted
- Improved tool result logging and iteration tracking

nanobot/agent/loop.py

@@ -221,13 +221,19 @@ class AgentLoop:
                     args_str = json.dumps(tool_call.arguments, ensure_ascii=False)
                     logger.info(f"Tool call: {tool_call.name}({args_str[:200]})")
                     result = await self.tools.execute(tool_call.name, tool_call.arguments)
+                    logger.info(f"Tool result length: {len(result) if result else 0}, preview: {result[:200] if result else 'None'}")
                     messages = self.context.add_tool_result(
                         messages, tool_call.id, tool_call.name, result
                     )
+                    logger.debug(f"Added tool result to messages. Total messages: {len(messages)}")
             else:
                 final_content = self._strip_think(response.content)
+                logger.info(f"Final response generated. Content length: {len(final_content) if final_content else 0}")
                 break
-
+        
+        if final_content is None and iteration >= self.max_iterations:
+            logger.warning(f"Max iterations ({self.max_iterations}) reached without final response. Last tool calls: {tools_used[-3:] if len(tools_used) >= 3 else tools_used}")
+        
         return final_content, tools_used
 
     async def run(self) -> None:

nanobot/providers/litellm_provider.py

@@ -3,11 +3,37 @@
 import json
 import json_repair
 import os
+import sys
 from typing import Any
 
+# Workaround for litellm's os.getcwd() issue during import
+# litellm/proxy/proxy_cli.py does sys.path.append(os.getcwd()) which can fail
+# if the current directory was deleted. Patch os.getcwd() to handle this gracefully.
+_original_getcwd = os.getcwd
+def _safe_getcwd():
+    try:
+        cwd = _original_getcwd()
+        # Verify the directory actually exists
+        if not os.path.exists(cwd):
+            raise FileNotFoundError(f"Current directory does not exist: {cwd}")
+        return cwd
+    except (FileNotFoundError, OSError):
+        # Return a safe fallback directory (home directory)
+        fallback = os.path.expanduser("~")
+        # Ensure fallback exists
+        if not os.path.exists(fallback):
+            fallback = "/tmp"
+        return fallback
+
+# Patch os.getcwd before importing litellm
+os.getcwd = _safe_getcwd
+
 import litellm
 from litellm import acompletion
 
+# Restore original getcwd after import
+os.getcwd = _original_getcwd
+
 from nanobot.providers.base import LLMProvider, LLMResponse, ToolCallRequest
 from nanobot.providers.registry import find_by_model, find_gateway