lark

name	lark
description	Lark/Feishu API integration for messaging, group management, contacts, and calendar. Use this skill to send messages, manage chats, query contacts, and sync calendar events with Lark/Feishu.
vm0_secrets	["LARK_APP_SECRET"]
vm0_vars	["LARK_APP_ID"]

Lark (Feishu) API

Complete Lark/Feishu integration for enterprise collaboration, including messaging, group management, contacts, and calendar.

When to Use

• Send automated notifications to users or groups
• Build interactive bot workflows
• Manage group chats and members
• Query contacts and organization structure
• Sync calendar events and schedules
• Integrate Lark with other systems

Prerequisites

Set the following environment variables:

export LARK_APP_ID=cli_xxxxx
export LARK_APP_SECRET=xxxxx

Get your credentials from: https://open.larkoffice.com/

Required Permissions

Enable these API scopes in your Lark app:

• im:message - Send and read messages
• im:chat - Manage group chats
• contact:user.base:readonly - Read contacts
• calendar:calendar - Manage calendars

Token Management

Lark uses tenant access tokens that expire after 2 hours. Use this helper to get or refresh the token:

# Get or refresh token (cached to /tmp/lark_token.json)
get_lark_token() {
  local token_file="/tmp/lark_token.json"
  local current_time=$(date +%s)

  # Check if cached token is still valid
  if [ -f "$token_file" ]; then
    local expire_time=$(jq -r '.expire_time // 0' "$token_file" 2>/dev/null || echo "0")
    if [ "$current_time" -lt "$expire_time" ]; then
      jq -r '.tenant_access_token' "$token_file"
      return 0
    fi
  fi

  # Get new token
  local response=$(curl -s -X POST "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal" \
    -H "Content-Type: application/json" \
    -d "{\"app_id\": \"${LARK_APP_ID}\", \"app_secret\": \"${LARK_APP_SECRET}\"}")

  local code=$(echo "$response" | jq -r '.code // -1')
  if [ "$code" != "0" ]; then
    echo "Error: $(echo  | jq -r '.msg')" >&2
     1
  

   expire=$(  | jq -r )
   expire_time=$((current_time + expire - ))
    | jq  > 
  jq -r  
}


TOKEN=$(get_lark_token)

Or get token directly without caching:

TOKEN=$(bash -c 'curl -s -X POST "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal" \
  -H "Content-Type: application/json" \
  -d "{\"app_id\": \"${LARK_APP_ID}\", \"app_secret\": \"${LARK_APP_SECRET}\"}"' | jq -r '.tenant_access_token')

Examples

1. Authentication - Get Access Token

Get and display tenant access token:

Write to /tmp/lark_request.json:

{
  "app_id": "${LARK_APP_ID}",
  "app_secret": "${LARK_APP_SECRET}"
}

bash -c 'curl -X POST "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json'

2. Messaging - Send Messages

Send Text Message to User

Write to /tmp/lark_request.json:

{
  "receive_id": "ou_xxx",
  "msg_type": "text",
  "content": "{\"text\": \"Hello World\"}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Send Text Message to Group Chat

Write to /tmp/lark_request.json:

{
  "receive_id": "oc_xxx",
  "msg_type": "text",
  "content": "{\"text\": \"Group message\"}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=chat_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Send Rich Text (Post) Message

Write to /tmp/lark_request.json:

{
  "receive_id": "ou_xxx",
  "msg_type": "post",
  "content": "{\"zh_cn\": {\"title\": \"Title\", \"content\": [[{\"tag\": \"text\", \"text\": \"Content\"}]]}}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Send Interactive Card Message

Write to /tmp/lark_request.json:

{
  "receive_id": "oc_xxx",
  "msg_type": "interactive",
  "content": "{\"header\": {\"title\": {\"tag\": \"plain_text\", \"content\": \"Alert\"}}, \"elements\": [{\"tag\": \"div\", \"text\": {\"tag\": \"plain_text\", \"content\": \"Message\"}}]}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=chat_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Reply to Message

Write to /tmp/lark_request.json:

{
  "msg_type": "text",
  "content": "{\"text\": \"Reply content\"}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages/om_xxx/reply" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Get Chat History

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/im/v1/messages?container_id_type=chat&container_id=oc_xxx&page_size=20" \
  -H "Authorization: Bearer ${TOKEN}"

3. Chat Management - Group Operations

Create Group Chat

Write to /tmp/lark_request.json:

{
  "name": "Project Team",
  "description": "Project discussion group",
  "user_id_list": ["ou_xxx", "ou_yyy"]
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/chats?user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

List All Chats

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/im/v1/chats" \
  -H "Authorization: Bearer ${TOKEN}"

Get Chat Info

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/im/v1/chats/oc_xxx" \
  -H "Authorization: Bearer ${TOKEN}"

Add Members to Chat

Write to /tmp/lark_request.json:

{
  "id_list": ["ou_xxx", "ou_yyy"]
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/chats/oc_xxx/members?member_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Remove Members from Chat

Write to /tmp/lark_request.json:

{
  "id_list": ["ou_xxx"]
}

TOKEN=$(get_lark_token)
curl -X DELETE "https://open.feishu.cn/open-apis/im/v1/chats/oc_xxx/members?member_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

4. Contacts - Directory Queries

Get User Info

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/contact/v3/users/ou_xxx?user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}"

Search Users

Write to /tmp/lark_request.json:

{
  "query": "John"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/contact/v3/users/search?user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

List Departments

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/contact/v3/departments?parent_department_id=0" \
  -H "Authorization: Bearer ${TOKEN}"

Get Department Members

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/contact/v3/users/find_by_department?department_id=od_xxx&user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}"

5. Calendar - Schedule Management

List Calendars

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/calendar/v4/calendars" \
  -H "Authorization: Bearer ${TOKEN}"

Create Calendar

Write to /tmp/lark_request.json:

{
  "summary": "Project Calendar",
  "description": "Calendar for project events"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/calendar/v4/calendars" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Create Calendar Event

Note: Replace <calendar_id> with an actual calendar ID from List Calendars API.

TOKEN=$(get_lark_token)

# Convert ISO 8601 to Unix timestamp
START_TS=$(date -d "2025-01-15T10:00:00+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-15T10:00:00+08:00" +%s)
END_TS=$(date -d "2025-01-15T11:00:00+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-15T11:00:00+08:00" +%s)

# Write request with timestamps
cat > /tmp/lark_request.json <<EOF
{
  "summary": "Team Meeting",
  "description": "Weekly sync",
  "start_time": {"timestamp": "${START_TS}"},
  "end_time": {"timestamp": "${END_TS}"}
}
EOF

curl -X POST "https://open.feishu.cn/open-apis/calendar/v4/calendars/<calendar_id>/events" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

List Calendar Events

TOKEN=$(get_lark_token)

# Convert date range
START_TS=$(date -d "2025-01-01T00:00:00+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-01T00:00:00+08:00" +%s)
END_TS=$(date -d "2025-01-31T23:59:59+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-31T23:59:59+08:00" +%s)

curl -X GET "https://open.feishu.cn/open-apis/calendar/v4/calendars/<calendar_id>/events?start_time=${START_TS}&end_time=${END_TS}" \
  -H "Authorization: Bearer ${TOKEN}"

6. Bot Information

Get Bot Info

TOKEN=$(get_lark_token)
curl -X GET "https://open.feishu.cn/open-apis/bot/v3/info" \
  -H "Authorization: Bearer ${TOKEN}"

Workflows

Send System Alert to Group

Write to /tmp/lark_request.json:

{
  "receive_id": "oc_xxx",
  "msg_type": "interactive",
  "content": "{\"header\": {\"title\": {\"tag\": \"plain_text\", \"content\": \"System Alert\"}, \"template\": \"red\"}, \"elements\": [{\"tag\": \"div\", \"text\": {\"tag\": \"lark_md\", \"content\": \"**Error:** Service down\"}}]}"
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/messages?receive_id_type=chat_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Create Team Group with Members

Write to /tmp/lark_request.json:

{
  "name": "Q1 Project",
  "description": "Q1 project discussion",
  "user_id_list": ["ou_abc", "ou_def", "ou_ghi"]
}

TOKEN=$(get_lark_token)
curl -X POST "https://open.feishu.cn/open-apis/im/v1/chats?user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Query Organization Structure

TOKEN=$(get_lark_token)

# Get root departments
curl -X GET "https://open.feishu.cn/open-apis/contact/v3/departments?parent_department_id=0" \
  -H "Authorization: Bearer ${TOKEN}" | jq '.data.items[] | {id: .department_id, name: .name}'

# Get members in a department
curl -X GET "https://open.feishu.cn/open-apis/contact/v3/users/find_by_department?department_id=od_xxx&user_id_type=open_id" \
  -H "Authorization: Bearer ${TOKEN}" | jq '.data.items[] | {id: .user_id, name: .name}'

Schedule a Meeting

TOKEN=$(get_lark_token)

START_TS=$(date -d "2025-01-20T09:00:00+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-20T09:00:00+08:00" +%s)
END_TS=$(date -d "2025-01-20T10:30:00+08:00" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-20T10:30:00+08:00" +%s)

# Write request with timestamps
cat > /tmp/lark_request.json <<EOF
{
  "summary": "Sprint Planning",
  "description": "Sprint 5 planning session",
  "start_time": {"timestamp": "${START_TS}"},
  "end_time": {"timestamp": "${END_TS}"}
}
EOF

curl -X POST "https://open.feishu.cn/open-apis/calendar/v4/calendars/<calendar_id>/events" \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d @/tmp/lark_request.json

Message Types Reference

Type	msg_type	content Format
Text	text	{"text": "message"}
Rich Text	post	{"zh_cn": {"title": "...", "content": [...]}}
Image	image	{"image_key": "img_xxx"}
Card	interactive	{"header": {...}, "elements": [...]}

ID Types Reference

ID Type	Description	Example
open_id	User open ID (default)	ou_xxx
user_id	User ID	abc123
union_id	Union ID across apps	on_xxx
email	User email address	[e-mail]
chat_id	Group chat ID	oc_xxx

Guidelines

1. Token Management: Tokens expire after 2 hours. Use the get_lark_token helper function for automatic caching and refresh.

2. Rate Limits: Lark has rate limits per app. Add delays for bulk operations to avoid hitting limits.

3. ID Types: Use open_id for most user operations. Use chat_id when targeting group chats.

4. Card Builder: Design complex interactive cards using Lark Card Builder: https://open.larkoffice.com/tool/cardbuilder

5. Error Handling: Check the code field in responses. 0 means success, non-zero indicates an error.

6. Content Escaping: Message content must be JSON-escaped when passed as string. Use jq to build complex payloads:

   CONTENT=$(jq -n --arg text "Hello" '{text: $text}')
   curl ... -d "{\"content\": \"$(echo $CONTENT | jq -c .)\"}"
   

7. Date Conversion: Calendar events require Unix timestamps. Use date command with appropriate flags for your OS:

   • Linux: date -d "2025-01-15T10:00:00+08:00" +%s
   • macOS: date -j -f "%Y-%m-%dT%H:%M:%S%z" "2025-01-15T10:00:00+08:00" +%s

API Reference

• API Documentation: https://open.larkoffice.com/document/home/index
• API Explorer: https://open.larkoffice.com/api-explorer
• Card Builder: https://open.larkoffice.com/tool/cardbuilder
• Permissions: https://open.larkoffice.com/document/home/introduction-to-scope-and-authorization/overview