I have a new project with just 1 folder and 1 api endpoint. My plan is to host it on the edge.

This is the code below in the api/chat.ts

import { systemPrompt } from '@/constants/SystemPrompt';
import TarrotDeck from '@/constants/TarrotDeck';
import { openai } from '@ai-sdk/openai';
import { streamText, tool } from 'ai';
import { z } from 'zod';

export async function POST(req: Request) {
    const data = await req.json();

    const result = streamText({
        model: openai("gpt-4o-mini"),
        system: systemPrompt({
            firstName: data.firstName,
            birthDate: data.dateOfBirth,
            birthLocation: data.locationOfBirth,
        }),
        messages: data.messages,
        tools: {
            /**
             * Pulls a random card from the tarot deck
             */
            tarotDeckCard: tool({
                description: "Pulls a random card from the tarot deck. Always use this tool if a question requires a card.",
                parameters: z.object({}),
                execute: async ({ }) => {
                    const cardNumber = Math.floor(Math.random() * TarrotDeck.length);
                    const randomCard = TarrotDeck[cardNumber];
                    return randomCard;
                },
            }),
        },
    });

    return result.toDataStreamResponse();
}

Everytime I try using it (locally running vercel dev) I get NO_RESPONSE_FROM_FUNCTION error