replaced less supported tool choice arg with more common

Author: virrius

sgr_agent_core/agents/sgr_tool_calling_agent.py

@@ -41,7 +41,7 @@ async def _reasoning_phase(self) -> ReasoningTool:
         async with self.openai_client.chat.completions.stream(
             messages=await self._prepare_context(),
             tools=[pydantic_function_tool(ReasoningTool, name=ReasoningTool.tool_name)],
-            tool_choice={"type": "function", "function": {"name": ReasoningTool.tool_name}},
+            tool_choice=self.tool_choice,
             **self.config.llm.to_openai_client_kwargs(),
         ) as stream:
             async for event in stream: