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# TelegramProvider

`TelegramProvider` connects Mastra agents to Telegram bots through the Bot API. Register it on `Mastra.channels` to manage bot installations, choose webhook or polling delivery, verify webhook secrets, register commands, and route Telegram conversations to agents.

Use `TelegramProvider` when you want Mastra to own the bot lifecycle. For the lower-level path where you configure the Telegram adapter and webhook yourself, use [`createTelegramAdapter`](https://mastra.ai/integrations/channels/telegram) on the agent's `channels.adapters`.

## Usage example

Create a bot with [BotFather](https://t.me/botfather), set `TELEGRAM_BOT_TOKEN`, and register the provider with a public base URL for webhook delivery:

```typescript
import { Agent } from '@mastra/core/agent'
import { Mastra } from '@mastra/core/mastra'
import { TelegramProvider } from '@mastra/telegram'

const supportAgent = new Agent({
  id: 'support',
  name: 'Support agent',
  instructions: 'Help users with product questions.',
  model: 'openai/gpt-5-mini',
})

const telegram = new TelegramProvider({
  baseUrl: 'https://your-app.example.com',
})

export const mastra = new Mastra({
  agents: { supportAgent },
  channels: { telegram },
})

await telegram.connect('support', {
  botToken: process.env.TELEGRAM_BOT_TOKEN,
})
```

When `botToken` is omitted, `connect()` creates a pending installation and returns a BotFather deep link instead of activating the bot immediately.

## Constructor parameters

`TelegramProviderConfig` combines Telegram lifecycle options, adapter behavior, and a curated subset of [`ChannelConfig`](https://mastra.ai/reference/agents/channels) options forwarded to each connected agent. All fields are optional.

**baseUrl** (`string`): Public HTTPS base URL used to register per-bot webhooks. May be auto-detected from the Mastra server config. Required when the resolved mode is webhook.

**storage** (`ChannelsStorage`): Storage for bot installations. Defaults to Mastra's channels storage when available, then falls back to in-memory storage for development and tests.

**apiBaseUrl** (`string`): Telegram Bot API origin. Override it for a self-hosted Bot API server or test server. (Default: `'https://api.telegram.org'`)

**encryptionKey** (`string`): Passphrase used to encrypt bot and webhook secret tokens at rest with AES-256-GCM. Falls back to MASTRA\_ENCRYPTION\_KEY. Without a key, persistent storage saves the tokens as plaintext.

**mode** (`'auto' | 'webhook' | 'polling'`): Update transport. 'auto' uses webhooks when a base URL is available and polling otherwise. Telegram doesn't allow webhooks and long polling for the same bot at the same time. (Default: `'auto'`)

**allowedUpdates** (`string[]`): Update types requested from Telegram in webhook mode. Defaults include messages, edited messages, channel posts, callback queries, and message reactions.

**longPolling** (`TelegramAdapterConfig['longPolling']`): Polling configuration such as timeout, limit, allowed updates, and retry delay. Ignored in webhook mode.

**commands** (`TelegramCommand[]`): Default commands registered for each connected agent. Defaults to start, help, and settings. Per-agent connect options override this list.

**commandScope** (`Record<string, unknown>`): Telegram Bot API command scope passed to setMyCommands, such as { type: 'all\_private\_chats' }.

**streaming** (`StreamingConfig`): Streams generated text by posting and editing Telegram messages. The adapter handles the Telegram message length limit. (Default: `true`)

**typingStatus** (`boolean`): Keeps a Telegram typing indicator active while the agent generates a response. (Default: `true`)

**toolDisplay** (`ChannelAdapterConfig['toolDisplay']`): Controls tool-call rendering. Rich Slack-oriented display modes degrade to plain fallback text in Telegram, so the provider defaults to 'text'. (Default: `'text'`)

**tools** (`ChannelConfig['tools']`): Controls whether channel reaction tools are exposed to the agent. (Default: `true`)

**waitUntil** (`WaitUntilFn`): Keeps serverless invocations alive while agent streaming continues after the webhook response.

**resolveWaitUntil** (`ChannelConfig['resolveWaitUntil']`): Resolves a platform waitUntil function from the webhook request's Hono context.

**handlers** (`ChannelHandlers`): Overrides built-in direct message, mention, or subscribed-message handlers.

**inlineMedia** (`ChannelConfig['inlineMedia']`): Controls which Telegram media types are sent inline to the model.

**inlineLinks** (`ChannelConfig['inlineLinks']`): Controls whether URLs in message text are promoted to file parts.

**state** (`ChannelConfig['state']`): State adapter used for event deduplication, locking, and subscriptions.

**threadContext** (`ChannelConfig['threadContext']`): Controls fetching recent Telegram thread messages when an agent joins a conversation.

**chatOptions** (`ChannelConfig['chatOptions']`): Additional options passed to the Chat SDK.

**resolveResourceId** (`ChannelConfig['resolveResourceId']`): Resolves the memory resource ID before a channel thread is created.

**cors** (`ChannelAdapterConfig['cors']`): CORS configuration for the generated Telegram webhook route.

**formatError** (`ChannelAdapterConfig['formatError']`): Overrides how errors are rendered in Telegram messages.

**logger** (`TelegramAdapterConfig['logger']`): Logger passed to the underlying Telegram adapter.

**onInstall** (`(installation: TelegramInstallation) => void | Promise<void>`): Called after an agent successfully connects a bot and its installation is persisted.

## Methods

### Installation lifecycle

#### `connect(agentId, options)`

Connects an agent to a Telegram bot. The provider validates a BotFather token with `getMe`, prepares the selected delivery mode and commands, then stores the installation before activating the adapter.

```typescript
const result = await telegram.connect('support', {
  botToken: process.env.TELEGRAM_BOT_TOKEN,
  name: 'Support bot',
  commands: [
    { command: 'help', description: 'Show support options' },
    { command: 'status', description: 'Check service status' },
  ],
})
```

`TelegramConnectOptions` fields:

**botToken** (`string`): BotFather token. When provided, the connection completes immediately. When omitted, connect() returns a BotFather deep link and a pending installation ID.

**name** (`string`): Display name for the bot. Defaults to the bot's Telegram username or first name.

**commands** (`TelegramCommand[]`): Commands registered for this agent. Overrides the provider's default commands.

Returns: `Promise<ChannelConnectResult>`

#### `disconnect(agentId)`

Stops the active transport and removes its stored installation. In webhook mode, it also removes the Telegram webhook.

```typescript
await telegram.disconnect('support')
```

Returns: `Promise<void>`

#### `listInstallations()`

Lists active and pending Telegram installations without exposing bot or webhook secret tokens.

```typescript
const installations = await telegram.listInstallations()
```

Returns: `Promise<ChannelInstallationInfo[]>`

#### `getInstallation(agentId)`

Returns the full installation for an agent, including sensitive bot and webhook tokens, or `null` when no installation exists.

```typescript
const installation = await telegram.getInstallation('support')
```

Returns: `Promise<TelegramInstallation | null>`

### Configuration and status

#### `configure(credentials)`

Updates the Bot API origin or webhook base URL at runtime. Passing `null` is a no-op because Telegram credentials belong to individual bot installations.

```typescript
await telegram.configure({
  baseUrl: 'https://new-app.example.com',
  apiBaseUrl: 'https://api.telegram.org',
})
```

Returns: `Promise<void>`

#### `initialize()`

Restores active installations from storage and rebuilds their Telegram adapters before reconnecting the registered agents. Mastra calls this during startup.

```typescript
await telegram.initialize()
```

Returns: `Promise<void>`

#### `isConfigured()`

Returns whether at least one active Telegram installation exists.

```typescript
const configured = telegram.isConfigured()
```

#### `getInfo()`

Returns channel discovery metadata for the Editor UI, including connection status and the `botToken` and `name` connect-option schema.

```typescript
const info = telegram.getInfo()
```

Returns: `ChannelPlatformInfo`

#### `getAdapter(installationId)`

Returns the live `TelegramAdapter` for an active installation.

```typescript
const adapter = telegram.getAdapter(installationId)
```

Returns: `TelegramAdapter | undefined`

#### `getRoutes()`

Returns the provider's unauthenticated `POST /telegram/events/:webhookId` route. Mastra registers this route automatically.

```typescript
const routes = telegram.getRoutes()
```

Returns: `ApiRoute[]`

## Delivery modes

- **`webhook`** registers a per-bot webhook under `/telegram/events/:webhookId` and verifies the `X-Telegram-Bot-Api-Secret-Token` header.
- **`polling`** removes any existing webhook before starting Telegram's `getUpdates` loop.
- **`auto`** selects webhooks when a public base URL is available and polling otherwise.

In production, use persistent channels storage and set `encryptionKey` or `MASTRA_ENCRYPTION_KEY`, because the in-memory fallback doesn't preserve installations across restarts.

## Related

- [ChannelProvider](https://mastra.ai/reference/channels/channel-provider): the interface `TelegramProvider` implements
- [Telegram adapter integration](https://mastra.ai/integrations/channels/telegram): the lower-level `createTelegramAdapter` path
- [Channels](https://mastra.ai/docs/channels): channel concepts and agent configuration
- [Channels reference](https://mastra.ai/reference/agents/channels): the `channels` config on the `Agent` constructor