Update backend/agent_instance.py

backend/agent_instance.py

@@ -4,21 +4,30 @@ import os
 # ✅ Add src to Python path
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "src")))
 
-from txagent.txagent import TxAgent  # ✅ Now this will work
+from txagent.txagent import TxAgent
 
 def init_agent():
-    # ✅ Use /data for persistent model caching on Hugging Face Spaces
-    model_cache_dir = "/data/txagent_models"
+    # ✅ Use Hugging Face persistent storage
+    base_dir = "/data"
+    model_cache_dir = os.path.join(base_dir, "hf_cache")
+    tool_cache_dir = os.path.join(base_dir, "tool_cache")
+
+    # ✅ Ensure the folders exist
     os.makedirs(model_cache_dir, exist_ok=True)
+    os.makedirs(tool_cache_dir, exist_ok=True)
+
+    # ✅ Set environment variables so models stay cached after restart
     os.environ["TRANSFORMERS_CACHE"] = model_cache_dir
     os.environ["HF_HOME"] = model_cache_dir
 
+    # ✅ Paths to model + tool definitions
     model_name = "mims-harvard/TxAgent-T1-Llama-3.1-8B"
     rag_model_name = "mims-harvard/ToolRAG-T1-GTE-Qwen2-1.5B"
     tool_files_dict = {
-        "new_tool": os.path.abspath("data/new_tool.json")
+        "new_tool": os.path.join(tool_cache_dir, "new_tool.json")
     }
 
+    # ✅ Init agent with config
     agent = TxAgent(
         model_name=model_name,
         rag_model_name=rag_model_name,