diff --git a/pilot/connections/pg_conn.py b/pilot/agent/__init__.py
similarity index 50%
rename from pilot/connections/pg_conn.py
rename to pilot/agent/__init__.py
index 1f776fc63..c53f601b3 100644
--- a/pilot/connections/pg_conn.py
+++ b/pilot/agent/__init__.py
@@ -1,2 +1,2 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
\ No newline at end of file
+# -*- coding:utf-8 -*-
diff --git a/pilot/agent/agent.py b/pilot/agent/agent.py
new file mode 100644
index 000000000..61f65c359
--- /dev/null
+++ b/pilot/agent/agent.py
@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+
+class Agent:
+    """Agent class for interacting with DB-GPT """
+    pass
\ No newline at end of file
diff --git a/pilot/agent/agent_manager.py b/pilot/agent/agent_manager.py
new file mode 100644
index 000000000..ef33f36da
--- /dev/null
+++ b/pilot/agent/agent_manager.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+from pilot.singleton import Singleton
+
+class AgentManager(metaclass=Singleton):
+    """Agent manager for managing DB-GPT agents"""
+    def __init__(self) -> None:
+        
+        self.agents = {} #TODO need to define
+
+    def create_agent(self):
+        pass
+
+    def message_agent(self):
+        pass
+
+    def list_agents(self):
+        pass
+
+    def delete_agent(self):
+        pass
+
diff --git a/pilot/client/__init__.py b/pilot/client/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/pilot/client/auto.py b/pilot/client/auto.py
deleted file mode 100644
index 78477809e..000000000
--- a/pilot/client/auto.py
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-
diff --git a/pilot/client/chart.py b/pilot/client/chart.py
deleted file mode 100644
index 6988cfe11..000000000
--- a/pilot/client/chart.py
+++ /dev/null
@@ -1,2 +0,0 @@
-#/usr/bin/env python3
-# -*- coding: utf-8 -*-
\ No newline at end of file
diff --git a/pilot/configs/config.py b/pilot/configs/config.py
new file mode 100644
index 000000000..0d74e97d9
--- /dev/null
+++ b/pilot/configs/config.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from auto_gpt_plugin_template import AutoGPTPluginTemplate
+from pilot.singleton import Singleton
+
+class Config(metaclass=Singleton):
+    """Configuration class to store the state of bools for different scripts access"""
+    def __init__(self) -> None:
+        """Initialize the Config class"""
+        pass
+
diff --git a/pilot/connections/base.py b/pilot/connections/base.py
new file mode 100644
index 000000000..318ce17a2
--- /dev/null
+++ b/pilot/connections/base.py
@@ -0,0 +1,8 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+"""We need to design a base class.  That other connector can Write with this"""
+
+class BaseConnection:
+    pass
+
diff --git a/pilot/connections/clickhouse.py b/pilot/connections/clickhouse.py
new file mode 100644
index 000000000..23f2660f9
--- /dev/null
+++ b/pilot/connections/clickhouse.py
@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+
+class ClickHouseConnector:
+    """ClickHouseConnector"""
+    pass
\ No newline at end of file
diff --git a/pilot/connections/es.py b/pilot/connections/es.py
new file mode 100644
index 000000000..819d85ecf
--- /dev/null
+++ b/pilot/connections/es.py
@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+
+class ElasticSearchConnector:
+    """ElasticSearchConnector"""
+    pass
\ No newline at end of file
diff --git a/pilot/connections/mongo.py b/pilot/connections/mongo.py
new file mode 100644
index 000000000..b66aefdb3
--- /dev/null
+++ b/pilot/connections/mongo.py
@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+class MongoConnector:
+    """MongoConnector is a class which connect to mongo and chat with LLM"""
+    pass
\ No newline at end of file
diff --git a/pilot/connections/mysql_conn.py b/pilot/connections/mysql.py
similarity index 85%
rename from pilot/connections/mysql_conn.py
rename to pilot/connections/mysql.py
index 2dfff2ee7..acc59a144 100644
--- a/pilot/connections/mysql_conn.py
+++ b/pilot/connections/mysql.py
@@ -4,7 +4,11 @@
 import pymysql
 
 class MySQLOperator:
-    """Connect MySQL Database fetch MetaData For LLM Prompt """
+    """Connect MySQL Database fetch MetaData For LLM Prompt 
+        Args:
+
+        Usage:
+    """
 
     default_db = ["information_schema", "performance_schema", "sys", "mysql"]
     def __init__(self, user, password, host="localhost", port=3306) -> None:
@@ -26,6 +30,9 @@ class MySQLOperator:
             cursor.execute(_sql)
             results = cursor.fetchall()
             return results
+    
+    def get_index(self, schema_name):
+        pass
 
     def get_db_list(self):
         with self.conn.cursor() as cursor:
@@ -38,5 +45,7 @@ class MySQLOperator:
             dbs = [d["Database"] for d in results if d["Database"] not in self.default_db]
             return dbs
 
+    def get_meta(self, schema_name):
+        pass
 
 
diff --git a/pilot/connections/oracle.py b/pilot/connections/oracle.py
new file mode 100644
index 000000000..4ce4e742a
--- /dev/null
+++ b/pilot/connections/oracle.py
@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+class OracleConnector:
+    """OracleConnector"""
+    pass
\ No newline at end of file
diff --git a/pilot/connections/postgres.py b/pilot/connections/postgres.py
new file mode 100644
index 000000000..3e1df00ab
--- /dev/null
+++ b/pilot/connections/postgres.py
@@ -0,0 +1,8 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+
+
+class PostgresConnector:
+    """PostgresConnector is a class which Connector to chat with LLM"""
+    pass
\ No newline at end of file
diff --git a/pilot/connections/redis.py b/pilot/connections/redis.py
new file mode 100644
index 000000000..ac00ade63
--- /dev/null
+++ b/pilot/connections/redis.py
@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+
+class RedisConnector:
+    """RedisConnector"""
+    pass
\ No newline at end of file
diff --git a/pilot/conversation.py b/pilot/conversation.py
index 2dc8df2b9..e1715e427 100644
--- a/pilot/conversation.py
+++ b/pilot/conversation.py
@@ -89,7 +89,7 @@ class Conversation:
 
 
 def gen_sqlgen_conversation(dbname):
-    from pilot.connections.mysql_conn import MySQLOperator
+    from pilot.connections.mysql import MySQLOperator
     mo = MySQLOperator(
         **DB_SETTINGS
     )
diff --git a/pilot/model/loader.py b/pilot/model/loader.py
index e601621f7..747585fa4 100644
--- a/pilot/model/loader.py
+++ b/pilot/model/loader.py
@@ -10,7 +10,12 @@ from transformers import (
 
 from fastchat.serve.compression import compress_module
 
-class ModerLoader:
+class ModelLoader:
+    """Model loader is a class for model load
+    
+      Args: model_path
+     
+    """
 
     kwargs = {}
 
diff --git a/pilot/server/vicuna_server.py b/pilot/server/vicuna_server.py
index 674afb71b..868e8b6d9 100644
--- a/pilot/server/vicuna_server.py
+++ b/pilot/server/vicuna_server.py
@@ -13,7 +13,7 @@ from pilot.model.inference import generate_output, get_embeddings
 from fastchat.serve.inference import load_model
 
 
-from pilot.model.loader import ModerLoader
+from pilot.model.loader import ModelLoader
 from pilot.configs.model_config import *
 
 model_path = LLM_MODEL_CONFIG[LLM_MODEL] 
@@ -22,7 +22,7 @@ model_path = LLM_MODEL_CONFIG[LLM_MODEL]
 global_counter = 0
 model_semaphore = None
 
-ml = ModerLoader(model_path=model_path)
+ml = ModelLoader(model_path=model_path)
 model, tokenizer = ml.loader(num_gpus=1, load_8bit=ISLOAD_8BIT, debug=ISDEBUG)
 #model, tokenizer = load_model(model_path=model_path, device=DEVICE, num_gpus=1, load_8bit=True, debug=False)
 
diff --git a/pilot/server/webserver.py b/pilot/server/webserver.py
index b31bfde7f..bbe710667 100644
--- a/pilot/server/webserver.py
+++ b/pilot/server/webserver.py
@@ -12,7 +12,7 @@ import requests
 from urllib.parse import urljoin
 from pilot.configs.model_config import DB_SETTINGS
 from pilot.server.vectordb_qa import KnownLedgeBaseQA
-from pilot.connections.mysql_conn import MySQLOperator
+from pilot.connections.mysql import MySQLOperator
 from pilot.vector_store.extract_tovec import get_vector_storelist, load_knownledge_from_doc, knownledge_tovec_st
 
 from pilot.configs.model_config import LOGDIR, VICUNA_MODEL_SERVER, LLM_MODEL, DATASETS_DIR
diff --git a/pilot/singleton.py b/pilot/singleton.py
new file mode 100644
index 000000000..8a9d6e2fa
--- /dev/null
+++ b/pilot/singleton.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""The singleton metaclass for ensuring only one instance of a class."""
+import abc
+from typing import Any
+
+class Singleton(abc.ABCMeta, type):
+    """ Singleton metaclass for ensuring only one instance of a class"""
+
+    _instances = {}
+    def __call__(cls, *args: Any, **kwargs: Any) -> Any:
+        """Call method for the singleton metaclass"""
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+
+class AbstractSingleton(abc.ABC, metaclass=Singleton):
+    """Abstract singleton class for ensuring only one instance of a class"""
+    pass
\ No newline at end of file
diff --git a/pilot/vector_store/file_loader.py b/pilot/vector_store/file_loader.py
index 881c8106f..296232f21 100644
--- a/pilot/vector_store/file_loader.py
+++ b/pilot/vector_store/file_loader.py
@@ -15,6 +15,20 @@ from pilot.configs.model_config import VECTORE_PATH, DATASETS_DIR, LLM_MODEL_CON
 
 class KnownLedge2Vector:
 
+    """KnownLedge2Vector class is order to load document to vector 
+    and persist to vector store.
+        
+        Args: 
+           - model_name
+
+        Usage:
+            k2v = KnownLedge2Vector()
+            persist_dir = os.path.join(VECTORE_PATH, ".vectordb") 
+            print(persist_dir)
+            for s, dc in k2v.query("what is oceanbase?"):
+                print(s, dc.page_content, dc.metadata)
+
+    """
     embeddings: object = None 
     model_name = LLM_MODEL_CONFIG["sentence-transforms"]
     top_k: int = VECTOR_SEARCH_TOP_K
@@ -81,11 +95,4 @@ class KnownLedge2Vector:
             dc, s = doc
             yield s, dc
 
-if __name__ == "__main__":
-    k2v = KnownLedge2Vector()
-
-    persist_dir = os.path.join(VECTORE_PATH, ".vectordb") 
-    print(persist_dir)
-    for s, dc in k2v.query("什么是OceanBase"):
-        print(s, dc.page_content, dc.metadata)
             
\ No newline at end of file