Arize Phoenix TS
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    openAIToolChoiceSchema: ZodUnion<
        readonly [
            ZodLiteral<"auto">,
            ZodLiteral<"none">,
            ZodLiteral<"required">,
            ZodObject<
                {
                    function: ZodObject<{ name: ZodString }, $strip>;
                    type: ZodLiteral<"function">;
                },
                $strip,
            >,
        ],
    > = ...

    OpenAI's tool choice schema