@Zients/Line Server

npm version CI Node.js License: MIT

MCP Server for LINE Messaging API — let AI agents send messages, manage groups, configure rich menus, and query analytics on LINE. Works with Codex CLI, Claude Code, OpenClaw, and any MCP-compatible client.

Disclaimer: This project is not affiliated with, endorsed by, or sponsored by LY Corporation or LINE.

Features

Messaging (12 tools)

Tool	Description
push_text_message	Send text to a user, group, or room
push_image_message	Send an image (HTTPS URLs only)
push_sticker_message	Send a LINE sticker
push_flex_message	Send a Flex Message (rich layout)
push_video_message	Send a video (HTTPS URLs only)
push_audio_message	Send an audio clip (HTTPS URLs only)
push_location_message	Send a location (lat/lng)
show_loading_indicator	Display a loading animation in a chat
broadcast_text_message	Broadcast text to all followers
multicast_text_message	Send text to multiple users (max 500)
broadcast_flex_message	Broadcast a Flex Message to all followers
multicast_flex_message	Send a Flex Message to multiple users (max 500)

Profile (2 tools)

Tool	Description
get_user_profile	Get user display name, picture, status, and language
get_group_summary	Get group name and picture (bot must be a member of the group)

Group & Room Management (8 tools)

Tool	Description
get_group_member_count	Get number of members in a group
get_group_member_ids	List all member IDs in a group
get_group_member_profile	Get a specific member's profile within a group
leave_group	Bot leaves a group (permanent)
get_room_member_count	Get number of members in a room
get_room_member_ids	List all member IDs in a room
get_room_member_profile	Get a specific member's profile within a room
leave_room	Bot leaves a room (permanent)

Rich Menu (9 tools)

Tool	Description
create_rich_menu	Create a new rich menu
list_rich_menus	List all rich menus
get_rich_menu	Get a specific rich menu by ID
delete_rich_menu	Delete a rich menu
set_default_rich_menu	Set the default rich menu for all users
get_default_rich_menu	Get the current default rich menu ID
cancel_default_rich_menu	Remove the default rich menu
link_rich_menu_to_user	Assign a rich menu to a specific user
unlink_rich_menu_from_user	Remove a user's assigned rich menu

Insight & Analytics (13 tools)

Tool	Description
get_bot_info	Get bot's display name, ID, chat mode, and mark-as-read mode
get_message_quota	Get monthly message sending quota
get_message_quota_consumption	Get messages sent this month
get_follower_ids	List follower user IDs (paginated)
get_number_of_followers	Get follower count statistics for a date (yyyyMMdd, UTC+9)
get_friend_demographics	Get follower demographic data (age, gender, area)
get_sent_reply_count	Get number of sent reply messages for a date (yyyyMMdd, UTC+9)
get_sent_push_count	Get number of sent push messages for a date (yyyyMMdd, UTC+9)
get_sent_multicast_count	Get number of sent multicast messages for a date (yyyyMMdd, UTC+9)
get_sent_broadcast_count	Get number of sent broadcast messages for a date (yyyyMMdd, UTC+9)
get_message_deliveries	Get number of message deliveries for a date (yyyyMMdd, UTC+9)
get_message_event	Get message event statistics by request ID
get_statistics_per_unit	Get statistics for a custom aggregation unit within a date range

Prerequisites

• Node.js >= 22
• A LINE Official Account with Messaging API enabled
• Channel Access Token

Create a LINE Official Account

1. Go to LINE Official Account Manager and create an account
2. Go to LINE Developers Console and log in
3. Create a Provider (or select an existing one)
4. Under the Provider, create a Messaging API Channel linked to your Official Account
5. Go back to LINE Developers Console, select your Provider and Channel
6. In the Basic settings tab, find Your user ID (U...) — for testing push messages to yourself
7. Go to the Messaging API tab, scroll to the bottom, and click Issue under Channel access token (long-lived) to generate your token

Enable Group/Room Features (Optional)

To use group/room tools or send messages to groups and rooms:

1. In LINE Official Account Manager → Settings → Account settings → enable Allow bot to join groups
2. In LINE Official Account Manager → Settings → Response settings → enable Webhook
3. In LINE Developers Console → your Channel → Messaging API tab → set your Webhook URL
4. Invite the bot to a group or room in the LINE app (search by the bot's Basic ID @xxx shown in LINE Developers Console → Basic settings)
5. To get the ID, receive the join event or any message event via Webhook — it will contain source.groupId (for groups) or source.roomId (for rooms)

Setup (npx — recommended)

No installation needed — just configure your MCP client.

DEFAULT_UID is optional. Set it when you want single-target messaging tools to use a default LINE User ID, so calls like push_text_message can omit to.

Codex CLI

codex mcp add @zients/line-mcp-server \
  --env CHANNEL_ACCESS_TOKEN=<your-token> \
  --env DEFAULT_UID=U... \
  -- npx -y @zients/line-mcp-server

Start a new Codex session after adding the MCP server so Codex loads the new tools.

Claude Code

claude mcp add @zients/line-mcp-server -t stdio \
  -e CHANNEL_ACCESS_TOKEN=<your-token> \
  -e DEFAULT_UID=U... \
  -- npx -y @zients/line-mcp-server

OpenClaw (mcporter)

mcporter config add @zients/line-mcp-server \
  --command npx \
  --arg -y --arg @zients/line-mcp-server \
  --env CHANNEL_ACCESS_TOKEN=<your-token> \
  --env DEFAULT_UID=U... \
  --description "LINE Messaging API tools"

Other MCP clients

Add the following to your MCP client configuration:

{
  "mcpServers": {
    "@zients/line-mcp-server": {
      "command": "npx",
      "args": ["-y", "@zients/line-mcp-server"],
      "env": {
        "CHANNEL_ACCESS_TOKEN": "<your-token>",
        "DEFAULT_UID": "U..."
      }
    }
  }
}

Setup (build from source)

git clone https://github.com/zients/line-mcp-server.git
cd line-mcp-server
npm install
npm run build   # compiles TypeScript to dist/

Codex CLI

codex mcp add @zients/line-mcp-server \
  --env CHANNEL_ACCESS_TOKEN=<your-token> \
  --env DEFAULT_UID=U... \
  -- node /path/to/line-mcp-server/dist/index.js

Claude Code

claude mcp add @zients/line-mcp-server -t stdio \
  -e CHANNEL_ACCESS_TOKEN=<your-token> \
  -e DEFAULT_UID=U... \
  -- node /path/to/line-mcp-server/dist/index.js

OpenClaw (mcporter)

mcporter config add @zients/line-mcp-server \
  --command node \
  --arg /path/to/line-mcp-server/dist/index.js \
  --env CHANNEL_ACCESS_TOKEN=<your-token> \
  --env DEFAULT_UID=U... \
  --description "LINE Messaging API tools"

Verify & call tools (mcporter)

mcporter list @zients/line-mcp-server --schema
mcporter call @zients/line-mcp-server.push_text_message to=U... text="Hello"
mcporter call @zients/line-mcp-server.push_text_message text="Hello from DEFAULT_UID"
mcporter call @zients/line-mcp-server.get_user_profile userId=U...
mcporter call @zients/line-mcp-server.get_bot_info

After registration, Claude can call LINE tools directly:

"Send 'Hello' to my LINE group C1234567890"

Target ID Prefixes

Prefix	Type
U...	User ID
C...	Group ID
R...	Room ID

Project Structure

src/
├── index.ts                          # Entry point (stdio MCP server)
├── services/
│   └── line.ts                       # LineService interface + LineMessagingClient
├── tools/
│   ├── messaging.ts                  # 12 messaging tools
│   ├── profile.ts                    # 2 profile tools
│   ├── group.ts                      # 8 group/room management tools
│   ├── richmenu.ts                   # 9 rich menu tools
│   └── insight.ts                    # 13 insight/analytics tools
└── utils/
    ├── error.ts                      # Error formatting utility
    ├── flex.ts                       # Flex message JSON validation
    └── target.ts                     # DEFAULT_UID parsing and target fallback

tests/
├── helpers/
│   └── mock-line-service.ts          # Shared mock LineService for all tests
├── integration/
│   └── server.test.ts                # MCP server integration test (all 44 tools)
├── services/
│   └── line.test.ts                  # LineMessagingClient unit tests
├── tools/
│   ├── messaging.test.ts             # Messaging tool handler tests
│   ├── profile.test.ts               # Profile tool handler tests
│   ├── group.test.ts                 # Group/room tool handler tests
│   ├── richmenu.test.ts              # Rich menu tool handler tests
│   └── insight.test.ts               # Insight tool handler tests
└── utils/
    ├── error.test.ts                 # Error formatting tests
    └── target.test.ts                # DEFAULT_UID and target fallback tests

Testing

npm test              # run all tests
npm run test:coverage # run with coverage report

Environment Variables

Variable	Required	Description
CHANNEL_ACCESS_TOKEN	Yes	LINE Messaging API channel access token
DEFAULT_UID	No	Default recipient User ID (must start with U). When set, the single-target messaging tools (push_text_message, push_image_message, push_sticker_message, push_flex_message, push_video_message, push_audio_message, push_location_message, show_loading_indicator) may omit to/chatId and send to this user by default. An explicit to (User/Group/Room) always overrides it. If set to a value that does not start with U, the server exits on startup.

License

MIT