diff --git a/src/agentscope/logging.py b/src/agentscope/logging.py
index 498c007b2..150bad5bb 100644
--- a/src/agentscope/logging.py
+++ b/src/agentscope/logging.py
@@ -175,7 +175,7 @@ def _level_format(record: dict) -> str:
     if record["level"].name == LEVEL_SAVE_LOG:
         return "{message}\n"
     else:
-        return _DEFAULT_LOG_FORMAT
+        return _DEFAULT_LOG_FORMAT + "\n"
 
 
 def setup_logger(
@@ -192,6 +192,9 @@ def setup_logger(
             `"DEBUG"`, `"INFO"`, `"SUCCESS"`, `"WARNING"`, `"ERROR"`,
             `"CRITICAL"`.
     """
+    # set logging level
+    logger.remove()
+
     # avoid reinit in subprocess
     if not hasattr(logger, "chat"):
         # add chat function for logger
@@ -201,8 +204,6 @@ def setup_logger(
         logger.level(LEVEL_SAVE_MSG, no=53)
         logger.chat = log_msg
 
-        # set logging level
-        logger.remove()
         # standard output for all logging except chat
         logger.add(
             sys.stdout,
diff --git a/src/agentscope/service/service_toolkit.py b/src/agentscope/service/service_toolkit.py
index 8f0013bda..f66d64fca 100644
--- a/src/agentscope/service/service_toolkit.py
+++ b/src/agentscope/service/service_toolkit.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 """Service Toolkit for service function usage."""
-import collections.abc
 import json
 from functools import partial
 import inspect
@@ -40,7 +39,10 @@ def _get_type_str(cls: Any) -> Optional[Union[str, list]]:
         # Typing class
         if cls.__origin__ is Union:
             type_str = [_get_type_str(_) for _ in get_args(cls)]
-        elif cls.__origin__ is collections.abc.Sequence:
+            clean_type_str = [_ for _ in type_str if _ != "null"]
+            if len(clean_type_str) == 1:
+                type_str = clean_type_str[0]
+        elif cls.__origin__ in [list, tuple]:
             type_str = "array"
         else:
             type_str = str(cls.__origin__)
@@ -52,7 +54,7 @@ def _get_type_str(cls: Any) -> Optional[Union[str, list]]:
             type_str = "number"
         elif cls is bool:
             type_str = "boolean"
-        elif cls is collections.abc.Sequence:
+        elif cls in [list, tuple]:
             type_str = "array"
         elif cls is None.__class__:
             type_str = "null"
@@ -511,9 +513,9 @@ def bing_search(query: str, api_key: str, num_results: int=10):
         docstring = parse(service_func.__doc__)
 
         # Function description
-        func_description = (
-            docstring.short_description or docstring.long_description
-        )
+        short_description = docstring.short_description or ""
+        long_description = docstring.long_description or ""
+        func_description = "\n\n".join([short_description, long_description])
 
         # The arguments that requires the agent to specify
         # to support class method, the self args are deprecated
@@ -669,9 +671,9 @@ def bing_search(query: str, api_key: str, num_results: int=10):
         docstring = parse(service_func.__doc__)
 
         # Function description
-        func_description = (
-            docstring.short_description or docstring.long_description
-        )
+        short_description = docstring.short_description or ""
+        long_description = docstring.long_description or ""
+        func_description = "\n".join([short_description, long_description])
 
         # The arguments that requires the agent to specify
         # we remove the self argument, for class methods