update comments

erniebot-agent/src/erniebot_agent/agents/function_agent.py

@@ -74,7 +74,7 @@ def __init__(
         file_manager: Optional[FileManager] = None,
         plugins: Optional[List[str]] = None,
         max_steps: Optional[int] = None,
-        first_tools: Optional[List[BaseTool]] = [],
+        first_tools: Optional[Sequence[BaseTool]] = [],
     ) -> None:
         """Initialize a function agent.
 
@@ -96,8 +96,8 @@ def __init__(
                 `plugins` to `[]` to disable the use of plugins.
             max_steps: The maximum number of steps in each agent run. If `None`,
                 use a default value.
-            first_tools: A list of tools that will be used first when running
-                the agent.
+            first_tools: Tools scheduled to be called sequentially at the
+                beginning of each agent run.
         """
         super().__init__(
             llm=llm,
@@ -135,7 +135,7 @@ async def _run(self, prompt: str, files: Optional[Sequence[File]] = None) -> Age
         chat_history.append(run_input)
 
         for tool in self._first_tools:
-            curr_step, new_messages = await self._step(chat_history, use_tool=tool)
+            curr_step, new_messages = await self._step(chat_history, selected_tool=tool)
             chat_history.extend(new_messages)
             num_steps_taken += 1
             if not isinstance(curr_step, NoActionStep):
@@ -161,15 +161,15 @@ async def _run(self, prompt: str, files: Optional[Sequence[File]] = None) -> Age
         return response
 
     async def _step(
-        self, chat_history: List[Message], use_tool: Optional[BaseTool] = None
+        self, chat_history: List[Message], selected_tool: Optional[BaseTool] = None
     ) -> Tuple[AgentStep, List[Message]]:
         new_messages: List[Message] = []
         input_messages = self.memory.get_messages() + chat_history
-        if use_tool is not None:
-            tool_choice = {"type": "function", "function": {"name": use_tool.tool_name}}
+        if selected_tool is not None:
+            tool_choice = {"type": "function", "function": {"name": selected_tool.tool_name}}
             llm_resp = await self.run_llm(
                 messages=input_messages,
-                functions=[use_tool.function_call_schema()],  # only regist one tool
+                functions=[selected_tool.function_call_schema()],  # only regist one tool
                 tool_choice=tool_choice,
             )
         else: