AI router: intents to flows, chit-chat to the AI

npm install @botmesh/core @botmesh/ai @anthropic-ai/sdk @botmesh/baileys

// bot.js
import { Bot, defineBot, flow, isMainModule, slashCommandsPlugin } from '@botmesh/core'
import { BaileysProvider } from '@botmesh/baileys'
import { aiPlugin, chatKeyOf } from '@botmesh/ai'

const INTENTS = ['payment', 'order', 'chat']
const CLASSIFIER = [
  'Classify the message a customer sent to Nimbus Mobile, a phone company, with one label:',
  'payment (wants to pay a bill or asks how to pay),',
  'order (asks where an order, a phone or a SIM card delivery is),',
  'chat (anything else). Reply with the label only.',
].join(' ')

// One small, bounded model call. The label is checked in code: the model only picks.
async function classify(ctx) {
  const { text } = await ctx.tools.ai.generate({
    system: CLASSIFIER,
    messages: [{ role: 'user', content: ctx.body }],
    maxTokens: 100,
    effort: 'low',
  })
  const label = text.trim().toLowerCase().replace(/[^a-z]/g, '')
  return INTENTS.includes(label) ? label : 'chat'
}

// Stand-in for your order system.
const trackOrder = (id) => `📦 Order ${id.toUpperCase()} left our warehouse and arrives tomorrow.`

const createBot = defineBot((provider) => {
  const bot = new Bot({ provider })

  bot.plug(slashCommandsPlugin, {
    greeting: '📱 Hi! I am the Nimbus Mobile assistant. I can take a payment, track an order or answer questions.',
  })

  // Deterministic flows. Typing their name ("payment", "order") starts them without any AI call.
  bot.use(
    flow('payment')
      .say('💳 *Pay your bill*')
      .ask('What is your account number? (6 digits)', 'account', {
        validate: (body) => (/^\d{6}$/.test(body.trim()) ? true : '❌ The account number has 6 digits, try again'),
      })
      .choose('How do you want to pay?', { card: 'Card', transfer: 'Bank transfer' }, 'method')
      .say((_ctx, c) => `✅ We sent a ${c.state.method === 'card' ? 'card payment' : 'bank transfer'} link for account ${c.state.account}.`),
  )
  bot.use(
    flow('order')
      .ask('What is your order number? (like N-1234)', 'id', {
        validate: (body) => (/^n-\d{4}$/i.test(body.trim()) ? true : '❌ That does not look like N-1234, try again'),
      })
      .say((_ctx, c) => trackOrder(c.state.id.trim())),
  )

  bot.plug(aiPlugin({
    provider: 'anthropic',
    apiKey: process.env.ANTHROPIC_API_KEY,
    model: 'claude-haiku-5-5',
    persona: 'You are the assistant of Nimbus Mobile, a phone company. Answer briefly and only about Nimbus Mobile.',
    autoReply: false, // the router below decides who answers
  }))

  // Free text: classify, then hand off to a flow or let the AI answer.
  bot.onMessage(async (ctx) => {
    // Photos, audio or locations without text: nothing to classify, so no model call.
    if (!ctx.body.trim()) return ctx.reply('✍️ I can only read text for now. Type "payment", "order" or your question.')
    try {
      const intent = await classify(ctx)
      if (intent === 'chat') {
        await ctx.reply(await ctx.tools.ai.replyInChat(chatKeyOf(ctx), ctx.body))
        return
      }
      await bot.trigger(intent, { chatId: ctx.from, userId: ctx.sender, isGroup: ctx.isGroup })
    } catch (err) {
      // No key, timeout, rate limit or outage: log it and never leave the customer in silence.
      bot.logger.warn({ err }, 'AI router failed')
      await ctx.reply('😕 I cannot answer that right now. Type "payment" or "order", or try again in a moment.')
    }
  })

  return bot
})

export default createBot

// `node bot.js` connects to WhatsApp; `npx botmesh dev bot.js` skips this block.
if (isMainModule(import.meta)) {
  const bot = await createBot(new BaileysProvider({ session: 'router-bot' }))
  bot.on('ready', () => console.log('✅ Connected'))
  await bot.start()
}

npx botmesh dev bot.js --env-file .env   # .env has the line ANTHROPIC_API_KEY=sk-ant-...

user › hi, I'd like to pay my bill please
bot › 💳 *Pay your bill*
bot › What is your account number? (6 digits)
user › 12345
bot › ❌ The account number has 6 digits, try again
user › 123456
bot › How do you want to pay?

      1) Card
      2) Bank transfer
user › 1
bot › ✅ We sent a card payment link for account 123456.
user › where is my new SIM card?
bot › What is your order number? (like N-1234)
user › N-2041
bot › 📦 Order N-2041 left our warehouse and arrives tomorrow.
user › thanks, you are great!
bot › Happy to help! 😊 Anything else about your Nimbus plan?