Agent skill

bots

Use when building Towns Protocol bots - covers SDK initialization, slash commands, message handlers, reactions, interactive forms, blockchain operations, and deployment. Triggers: "towns bot", "makeTownsBot", "onSlashCommand", "onMessage", "sendInteractionRequest", "webhook", "bot deployment", "@towns-protocol/bot"

View SKILL.md on GitHub Repository
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Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/bots

Metadata

Additional technical details for this skill

author
towns-protocol
version
2.0.0

SKILL.md

Towns Protocol Bot SDK Reference

Critical Rules

MUST follow these rules - violations cause silent failures:

  1. User IDs are Ethereum addresses - Always 0x... format, never usernames
  2. Mentions require BOTH - <@{userId}> format in text AND mentions array in options
  3. Two-wallet architecture:
    • bot.viem.account.address = Gas wallet (signs & pays fees) - MUST fund with Base ETH
    • bot.appAddress = Treasury (optional, for transfers)
  4. Slash commands DON'T trigger onMessage - They're exclusive handlers
  5. Interactive forms use type property - Not case (e.g., type: 'form')
  6. Never trust txHash alone - Verify receipt.status === 'success' before granting access

Quick Reference

Key Imports

typescript
import { makeTownsBot, getSmartAccountFromUserId } from '@towns-protocol/bot'
import type { BotCommand, BotHandler } from '@towns-protocol/bot'
import { Permission } from '@towns-protocol/web3'
import { parseEther, formatEther, erc20Abi, zeroAddress } from 'viem'
import { readContract, waitForTransactionReceipt } from 'viem/actions'
import { execute } from 'viem/experimental/erc7821'

Handler Methods

Method Signature Notes
sendMessage (channelId, text, opts?) → { eventId } opts: { threadId?, replyId?, mentions?, attachments? }
editMessage (channelId, eventId, text) Bot's own messages only
removeEvent (channelId, eventId) Bot's own messages only
sendReaction (channelId, messageId, emoji)
sendInteractionRequest (channelId, payload) Forms, transactions, signatures
hasAdminPermission (userId, spaceId) → boolean
ban / unban (userId, spaceId) Needs ModifyBanning permission

Bot Properties

Property Description
bot.viem Viem client for blockchain
bot.viem.account.address Gas wallet - MUST fund with Base ETH
bot.appAddress Treasury wallet (optional)
bot.botId Bot identifier

For detailed guides, see references/:

  • Messaging API - Mentions, threads, attachments, formatting
  • Blockchain Operations - Read/write contracts, verify transactions
  • Interactive Components - Forms, transaction requests
  • Deployment - Local dev, Render, tunnels
  • Debugging - Troubleshooting guide

Bot Setup

Project Initialization

bash
bunx towns-bot init my-bot
cd my-bot
bun install

Environment Variables

bash
APP_PRIVATE_DATA=<base64_credentials>   # From app.towns.com/developer
JWT_SECRET=<webhook_secret>              # Min 32 chars
PORT=3000
BASE_RPC_URL=https://base-mainnet.g.alchemy.com/v2/KEY  # Recommended

Basic Bot Template

typescript
import { makeTownsBot } from '@towns-protocol/bot'
import type { BotCommand } from '@towns-protocol/bot'

const commands = [
  { name: 'help', description: 'Show help' },
  { name: 'ping', description: 'Check if alive' }
] as const satisfies BotCommand[]

const bot = await makeTownsBot(
  process.env.APP_PRIVATE_DATA!,
  process.env.JWT_SECRET!,
  { commands }
)

bot.onSlashCommand('ping', async (handler, event) => {
  const latency = Date.now() - event.createdAt.getTime()
  await handler.sendMessage(event.channelId, 'Pong! ' + latency + 'ms')
})

export default bot.start()

Config Validation

typescript
import { z } from 'zod'

const EnvSchema = z.object({
  APP_PRIVATE_DATA: z.string().min(1),
  JWT_SECRET: z.string().min(32),
  DATABASE_URL: z.string().url().optional()
})

const env = EnvSchema.safeParse(process.env)
if (!env.success) {
  console.error('Invalid config:', env.error.issues)
  process.exit(1)
}

Event Handlers

onMessage

Triggers on regular messages (NOT slash commands).

typescript
bot.onMessage(async (handler, event) => {
  // event: { userId, spaceId, channelId, eventId, message, isMentioned, threadId?, replyId? }

  if (event.isMentioned) {
    await handler.sendMessage(event.channelId, 'You mentioned me!')
  }
})

onSlashCommand

Triggers on /command. Does NOT trigger onMessage.

typescript
bot.onSlashCommand('weather', async (handler, { args, channelId }) => {
  // /weather San Francisco → args: ['San', 'Francisco']
  const location = args.join(' ')
  if (!location) {
    await handler.sendMessage(channelId, 'Usage: /weather <location>')
    return
  }
  // ... fetch weather
})

onReaction

typescript
bot.onReaction(async (handler, event) => {
  // event: { reaction, messageId, channelId }
  if (event.reaction === '👋') {
    await handler.sendMessage(event.channelId, 'I saw your wave!')
  }
})

onTip

Requires "All Messages" mode in Developer Portal.

typescript
bot.onTip(async (handler, event) => {
  // event: { senderAddress, receiverAddress, amount (bigint), currency }
  if (event.receiverAddress === bot.appAddress) {
    await handler.sendMessage(event.channelId,
      'Thanks for ' + formatEther(event.amount) + ' ETH!')
  }
})

onInteractionResponse

typescript
bot.onInteractionResponse(async (handler, event) => {
  switch (event.response.payload.content?.case) {
    case 'form':
      const form = event.response.payload.content.value
      for (const c of form.components) {
        if (c.component.case === 'button' && c.id === 'yes') {
          await handler.sendMessage(event.channelId, 'You clicked Yes!')
        }
      }
      break
    case 'transaction':
      const tx = event.response.payload.content.value
      if (tx.txHash) {
        // IMPORTANT: Verify on-chain before granting access
        // See references/BLOCKCHAIN.md for full verification pattern
        await handler.sendMessage(event.channelId,
          'TX: https://basescan.org/tx/' + tx.txHash)
      }
      break
  }
})

Event Context Validation

Always validate context before using:

typescript
bot.onSlashCommand('cmd', async (handler, event) => {
  if (!event.spaceId || !event.channelId) {
    console.error('Missing context:', { userId: event.userId })
    return
  }
  // Safe to proceed
})

Common Mistakes

Mistake Fix
insufficient funds for gas Fund bot.viem.account.address with Base ETH
Mention not highlighting Include BOTH <@userId> in text AND mentions array
Slash command not working Add to commands array in makeTownsBot
Handler not triggering Check message forwarding mode in Developer Portal
writeContract failing Use execute() for external contracts
Granting access on txHash Verify receipt.status === 'success' first
Message lines overlapping Use \n\n (double newlines), not \n
Missing event context Validate spaceId/channelId before using

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