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How to connect LINE to Claude

Connect Claude Web, Desktop and Cowork to LINE MCP. Send coupon broadcast to line followers, create rich menu for promotions, and more using natural language, with authentication handled for you.

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LINE is a messaging platform and Official Account service for customer chat and broadcasts. Use it to reach customers in real time with rich, branded conversations.

13 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your LINE account to Claude via Composio Connect, enabling it to send coupon broadcast to LINE followers, create rich menu for promotions, list LINE audience groups by size, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate LINE with

ChatGPTGrok Bot

Connecting LINE to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your LINE account

Back in Claude, ask it to connect to LINE or give it any LINE-related task.

For example, ask Claude to:

  • "Send coupon broadcast to LINE followers"
  • "Create rich menu for promotions"
  • "List LINE audience groups by size"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your LINE account is ready to use.

What is the LINE Claude Connector, and what's possible with it?

The LINE MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your LINE account. It provides structured and secure access so your agent can perform LINE operations on your behalf.

Troubleshooting

1. Why does Claude not use the Composio connector for LINE?

The connector can show as connected, but Claude must use it in each LINE conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to LINE again.

2. Why does Claude show an MCP server error before LINE connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for LINE.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect LINE.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the LINE authorization link not work?

The Composio connector is one server. Your LINE account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the LINE connection.
  • Composio creates a fresh LINE authorization link.
  • Open that link in your browser and finish the LINE sign-in.

4. Why do LINE actions fail after they worked before?

The LINE connection can expire or lose permission.

  • Ask Claude to inspect the LINE connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the LINE account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in LINE.
  • If the action still fails with a permission error, check that the connected account has that permission in LINE itself.

5. How do I switch to a different LINE account?

Claude can manage the LINE connection for you.

  • Ask Claude to disconnect or delete the current LINE account.
  • Ask Claude to connect LINE again.
  • Open the new Composio authorization link for LINE.
  • Sign in with the other LINE account in the browser.
  • After the account connects, ask Claude to retry the LINE task.

6. Why is my LINE connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your LINE connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If LINE tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect LINE.
TOOLS

Supported Tools

Every LINE action and event your agent gets out of the box.

Create Rich Menu

Create a rich-menu definition and return its ID.

Create Rich Menu with Image

Create a rich-menu definition and upload its JPEG or PNG image in one call.

Delete Rich Menu

Permanently delete a rich menu by ID.

Download Message Content Preview

Download LINE's reduced-size preview image for a retained image or video message whose contentProvider.

Get Message Delivery Count

Get the number of reply, push, multicast, or broadcast messages sent on one UTC+9 calendar date.

Get Rich Menu

Get one Messaging API rich-menu definition by ID, including its canvas, tappable areas, and actions.

Link or Unlink User Rich Menu

Link or unlink a per-user rich menu.

List Chat Member IDs

Return one page of member user IDs for a group or legacy room containing the bot.

List Follower IDs

Return one page of user IDs for friends of the LINE Official Account.

List Rich Menus

List all rich menus created through the Messaging API.

Mark Messages as Read

Mark all messages through a webhook-issued read token as read.

Set or Clear Default Rich Menu

Set or clear the Messaging API default rich menu.

Upload Rich Menu Image

Upload a JPEG or PNG image for a rich menu.

FRAMEWORKS

How to build LINE MCP Agent with another framework

ChatGPT logo

ChatGPT

Use LINE MCP with ChatGPT

Grok Bot logo

Grok Bot

Use LINE MCP with Grok Bot

FAQ

Frequently asked questions

With a standalone LINE MCP server, the agents and LLMs can only access a fixed set of LINE tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from LINE and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right LINE tools.

Yes, absolutely. You can configure which LINE scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your LINE data and credentials are handled as safely as possible.

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