Forcing specific tool use

[mnicstruwig]

Hi @jackmpcollins, happy new year!

I had a look through the documentation, but couldn't find if there's a way to force the use of a specific tool, eg. using the tool_choice param like here for OpenAI and here for Anthropic.

Is this something that's currently possible with magentic? It's possible I missed it.

Thanks!

[jackmpcollins]

Hi @mnicstruwig , currently the tool_choice forces a specific tool if only one function / output type is specified.

magentic/src/magentic/chat_model/openai_chat_model.py

Lines 423 to 434 in fd0d03e

	@staticmethod
	def _get_tool_choice(
	*,
	tool_schemas: Sequence[BaseFunctionToolSchema[Any]],
	output_types: Iterable[type],
	) -> ChatCompletionToolChoiceOptionParam | openai.NotGiven:
	"""Create the tool choice argument."""
	if contains_string_type(output_types):
	return openai.NOT_GIVEN
	if len(tool_schemas) == 1:
	return tool_schemas[0].as_tool_choice()
	return "required"

Is your use case to provide multiple tools but still force a specific one to be used? To do this I think the tool_choice param would need to be exposed in the ChatModel.complete method and to Chat.submit and @prompt/@chatprompt.