Connecting to Lark

Supported Message Types

Version v4.15.0.

Message Type	Receive Support	Send Support	Notes
Text	Yes	Yes
Image	Yes	Yes
Voice	No	Yes
Video	No	Yes
File	No	Yes

Proactive message push: Supported.

Streaming output: Supported. You must enable the Create and update cards (cardkit:card:write) permission for your app in the Lark Developer Console.

The Lark client version must be >= 7.20. Lower versions only display the title and an upgrade prompt.

Creating a Bot

Lark supports two setup methods: one-click QR creation in AstrBot, or manually creating a custom enterprise app in the Lark Developer Console.

Option 1: One-click QR Creation

AstrBot version requirement: >= 4.25.0.

Open the AstrBot management panel, click Bots in the left sidebar, click + Create Bot, and select lark.

Under Creation Method, select One-click QR Creation, choose the China or international edition as needed, then scan the QR code with the Lark mobile app and confirm. After creation succeeds, AstrBot automatically fills in the app's app_id, app_secret, and domain configuration.

IMPORTANT

After an app is created through QR scanning, group chats receive only messages that @ mention the bot or messages triggered by a wake prefix such as / by default. If you need the bot to receive all group messages, enable the additional permissions in the Lark Developer Console.

Replace <APP_ID> in the URL below with your Lark app ID, then open it to jump to the permission enablement page:

To find the App ID, go back to AstrBot's Bots page, find the Lark bot you just created, click Edit, and check the dialog that opens.

https://open.feishu.cn/app/<APP_ID>/auth?q=contact:contact.base:readonly,im:message.p2p_msg:readonly,im:message.group_at_msg:readonly,im:message:send,im:message,im:message:send_as_bot,im:resource:upload,im:resource,cardkit:card:write,im:message.group_at_msg:readonly,im:message.group_msg&op_from=openapi&token_type=tenant

After QR creation succeeds, continue checking the event subscription, permissions, version release, and group installation steps below.

Option 2: Manual Creation

Navigate to the Developer Console and create a custom enterprise application.

Add the Bot capability to your application.

Click on "Credentials & Basic Info" to obtain your app_id and app_secret.

Configuring AstrBot

1. Access the AstrBot management panel
2. Click on Bots in the left sidebar
3. In the right panel, click + Create Bot
4. Select lark
5. If you want AstrBot to create the app for you, select One-click QR Creation and complete the scan. If you already created the app yourself, select Manual Creation

Fill in the configuration fields as follows:

• ID: Choose any identifier to distinguish between different messaging platform instances
• Enable: Check this option
• app_id: The app_id you obtained earlier
• app_secret: The app_secret you obtained earlier

For the domain field, if you're using Lark China, keep the default value. If you're using Lark International, set it to https://open.larksuite.com. If you're using a self-hosted enterprise Lark instance, enter your Lark instance's domain.

For the subscription method, socket uses a long connection subscription approach, while webhook sends events to your developer server and requires a public server. Generally, socket is recommended. However, if you're using Lark International or a self-hosted Lark instance, choose webhook. The subsequent configuration steps will differ accordingly.

If you selected the webhook method, navigate to the Lark Developer Console, click on "Events & Callbacks," then "Encryption Policy," and fill in the Encrypt Key. While not mandatory, AstrBot takes your data security seriously, so we strongly recommend setting this up. After filling it in, copy the Encrypt Key and Verification Token to the corresponding encrypt_key and verification_token fields in AstrBot's configuration.

Click Save.

Setting up Callbacks and Permissions

The following steps vary depending on the subscription method you selected above. Please proceed to the corresponding section based on your choice.

socket Long Connection Method

Next, click on "Events & Callbacks," select "Receive events using long connection," and click Save. If the previous step didn't start successfully, you won't be able to save here.

webhook Send Events to Developer Server Method

TIP

To make better use of this method, please refer to Unified Webhook Mode for the necessary configuration.

After clicking Save, the bot card will display "View Webhook URL." Click to view and copy the callback URL.

Next, return to Lark's Events & Callbacks page, click "Event Configuration," select "Send events to developer server," enter the callback URL you just copied as the "Request URL," and click Save. If everything is correct, no errors will appear.

Setting up Events

After completing the event configuration in the previous step, click "Add Event," navigate to "Messages & Groups," scroll down to find Receive Message, and add it.

Click to enable the following permissions.

Then click the Save button at the top.

Next, click on "Permission Management," click "Enable Permissions," and enter im:message:send,im:message,im:message:send_as_bot. Add the filtered permissions.

Enter im:resource:upload,im:resource again to enable image upload permissions.

If you want to use the bot in group chats, additionally enable im:message.group_at_msg:readonly and im:message.group_msg.

TIP

Apps created through one-click QR creation are suitable for @ mentions and wake-prefix triggers by default. To receive every group message, make sure im:message.group_msg is enabled. You can also use the permission URL above to quickly open the corresponding page.

If you want to use streaming output, additionally enable Create and update cards (cardkit:card:write).

The final set of permissions should look like this:

Creating a Version

Create a new version.

Fill in the version number, update notes, and visibility scope, then click Save and confirm the release.

Adding the Bot to a Group

Open the Lark app (the web version doesn't support adding bots), enter a group chat, click the button in the upper right corner → Group Bots → Add Bot.

Search for the bot you just created. For example, if you created the AstrBot bot as shown in this tutorial:

🎉 All Done!

Send a /help command in the group, and the bot will respond.