Evaluate a ticket

TYPESAFE_API_KEY=your-typesafe-api-key

import { boolean, choice, decide, score } from '@tanstack/ai'
import { typesafeDecider } from '@tanstack/ai-typesafe'

type Ticket = {
  subject: string
  body: string
}

const adapter = typesafeDecider('jev-latest')

export function evaluateTicket(ticket: Ticket) {
  return decide({
    adapter,
    state: ticket,
    questions: {
      queue: choice({
        instructions: 'Which team should handle this ticket?',
        options: {
          billing: 'Payments, invoices, refunds',
          tech: 'Bugs, outages, integrations',
          sales: 'Pricing, upgrades, new accounts',
        },
      }),
      urgency: score({
        instructions: 'How urgent is this ticket?',
        levels: ['low', 'medium', 'high'],
      }),
      refund: boolean({
        instructions: 'Is the customer asking for a refund?',
      }),
    },
  })
}

export type TicketResult = Awaited<ReturnType<typeof evaluateTicket>>

function readTicket(body: unknown): Ticket | null {
  if (typeof body !== 'object' || body === null || !('ticket' in body)) {
    return null
  }
  const ticket = body.ticket
  if (typeof ticket !== 'object' || ticket === null) return null
  if (!('subject' in ticket) || !('body' in ticket)) return null
  if (typeof ticket.subject !== 'string' || typeof ticket.body !== 'string') {
    return null
  }
  return { subject: ticket.subject, body: ticket.body }
}

export async function POST(request: Request) {
  const ticket = readTicket(await request.json())
  if (ticket === null) {
    return new Response('Send { ticket: { subject, body } }.', {
      status: 400,
    })
  }
  return Response.json(await evaluateTicket(ticket))
}

import { createFileRoute } from '@tanstack/react-router'
import { POST } from '@/lib/evaluate-ticket'

export const Route = createFileRoute('/api/evaluate')({
  server: {
    handlers: {
      POST: ({ request }) => POST(request),
    },
  },
})

import type { TicketResult } from '@/lib/evaluate-ticket'

async function postTicket(ticket: { subject: string; body: string }) {
  const res = await fetch('/api/evaluate', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ ticket }),
  })
  if (!res.ok) throw new Error(`Evaluate failed with ${res.status}`)
  const result: TicketResult = await res.json()
  return result
}

const result = await postTicket({
  subject: 'Charged twice for the same invoice',
  body: 'Please refund the extra payment.',
})

if (result.refund.value) {
  console.log('refund path', result.queue.value, result.urgency.value)
} else {
  console.log('route to', result.queue.value, result.urgency.value)
}