lark-integration – OpenClaw Skill

---

name: lark-integration description: Connect Lark (Feishu) messaging to OpenClaw via webhook bridge. Supports text, rich text (post), and image messages bidirectionally. Use when setting up Lark/Feishu as a messaging channel, receiving messages with images, sending replies back to Lark, reading Lark documents/wikis/bitables, or troubleshooting Lark integration issues. Covers both Lark International (larksuite.com) and China Feishu (feishu.cn).

Lark Integration

Connect Lark (Feishu) to OpenClaw for bidirectional messaging with full rich content support.

Quick Start

# 1. Set credentials
echo "FEISHU_APP_ID=cli_xxx" >> ~/.openclaw/workspace/.env
mkdir -p ~/.openclaw/secrets
echo "your_app_secret" > ~/.openclaw/secrets/feishu_app_secret

# 2. Start bridge
cd skills/lark-integration/scripts
node bridge-webhook.mjs

# 3. Configure Lark webhook URL in developer console
# https://open.larksuite.com → Your App → Event Subscriptions
# URL: http://YOUR_SERVER_IP:3000/webhook

Architecture

Lark App ──webhook──► Bridge (port 3000) ──WebSocket──► OpenClaw Gateway
                           │                                   │
                           ◄────────── Reply ──────────────────┘

Supported Message Types

Type	Direction	Format
text	↔ Both	Plain text
post	→ Receive	Rich text with images, links
image	→ Receive	Single image
Reply	← Send	Text (cards via feishu-card skill)

Platform Detection

The bridge auto-detects platform from URLs:

• *.larksuite.com → https://open.larksuite.com (International)
• *.feishu.cn → https://open.feishu.cn (China)

Configuration

Environment Variables

Variable	Required	Description
FEISHU_APP_ID	Yes	App ID from Lark Developer Console
FEISHU_APP_SECRET_PATH	No	Path to secret file (default: ~/.openclaw/secrets/feishu_app_secret)
WEBHOOK_PORT	No	Webhook listen port (default: 3000)
FEISHU_THINKING_THRESHOLD_MS	No	Delay before "Thinking..." placeholder (default: 2500)
FEISHU_ENCRYPT_KEY	No	Encryption key if enabled in Lark
OPENCLAW_AGENT_ID	No	Agent to route messages to (default: main)

Lark App Permissions

Enable these scopes in Lark Developer Console → Permissions & Scopes:

Messaging:

• im:message - Send and receive messages
• im:message:send_as_bot - Send messages as bot
• im:resource - Download message resources (images)

Documents (optional):

• docx:document:readonly - Read documents
• wiki:wiki:readonly - Read wiki spaces
• sheets:spreadsheet:readonly - Read spreadsheets
• bitable:bitable:readonly - Read bitables
• drive:drive:readonly - Access drive files

Scripts

bridge-webhook.mjs

Main webhook bridge. Receives Lark events, forwards to OpenClaw, sends replies.

FEISHU_APP_ID=cli_xxx node scripts/bridge-webhook.mjs

setup-service.mjs

Install as systemd service for auto-start:

node scripts/setup-service.mjs
# Creates /etc/systemd/system/lark-bridge.service

Image Handling

Images in messages are:

1. Detected from post content or image message type
2. Downloaded via Lark API using message_id and image_key
3. Converted to base64
4. Sent to OpenClaw Gateway as attachments parameter

attachments: [{ mimeType: "image/png", content: "<base64>" }]

Group Chat Behavior

In group chats, the bridge responds when:

• Bot is @mentioned
• Message ends with ? or ？
• Message contains trigger words: help, please, why, how, what, 帮, 请, 分析, etc.
• Message starts with bot name

Otherwise, messages are ignored to avoid noise.

Reading Documents

Use the feishu-doc skill to read Lark documents:

node skills/feishu-doc/index.js fetch "https://xxx.larksuite.com/docx/TOKEN"

Supported URL types:

• /docx/ - New documents
• /wiki/ - Wiki pages (auto-resolves to underlying doc)
• /sheets/ - Spreadsheets
• /base/ - Bitables (multi-dimensional tables)

Permission Note: Documents must be shared with the bot, or the bot must have tenant-wide read permission.

Troubleshooting

"forBidden" error when reading docs

• Document not shared with bot → Add bot as collaborator
• Missing scope → Enable docx:document:readonly in console

No messages received

• Check webhook URL is accessible: curl http://YOUR_IP:3000/health
• Verify webhook in Lark console shows "Verified"
• Check bridge logs: journalctl -u lark-bridge -f

"must be string" error

• Old bridge version → Update to use attachments for images

Images not received

• Missing im:resource scope → Enable in Lark console
• Token expired → Bridge auto-refreshes, restart if stuck

Service Management

# Check status
systemctl status lark-bridge

# View logs
journalctl -u lark-bridge -f

# Restart
systemctl restart lark-bridge

References

• Lark Developer Console (International)
• Feishu Developer Console (China)
• See references/api-formats.md for message format details
• See references/setup-guide.md for step-by-step setup