[Bug]: Can't add parallel_tool_calls in LLMConfig

[marklysze]

Describe the bug

The following works:
basic_llm_config = LLMConfig(config_list=[{"model": "gpt-4.1-mini", "api_type": "openai"}])
and
basic_llm_config = LLMConfig(model="gpt-4.1-mini", api_type="openai", parallel_tool_calls=False)

However, the following doesn't work:
basic_llm_config = LLMConfig(config_list=[{"model": "gpt-4.1-mini", "api_type": "openai", "parallel_tool_calls": False}])

Raises a Pydantic ValidationError exception:

pydantic_core._pydantic_core.ValidationError: 1 validation error for _LLMConfig
config_list.0.openai.parallel_tool_calls
  Extra inputs are not permitted [type=extra_forbidden, input_value=False, input_type=bool]

Steps to reproduce

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Model Used

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Expected Behavior

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Screenshots and logs

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Additional Information

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