Arize Phoenix TS
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    phoenixToolChoiceSchema: ZodUnion<
        readonly [
            ZodObject<{ type: ZodLiteral<"none"> }, $strip>,
            ZodObject<{ type: ZodLiteral<"zero_or_more"> }, $strip>,
            ZodObject<{ type: ZodLiteral<"one_or_more"> }, $strip>,
            ZodObject<
                { function_name: ZodString; type: ZodLiteral<"specific_function"> },
                $strip,
            >,
        ],
    > = ...

    Phoenix's tool choice schema