LINE Built an MCP Server for Its Own Bots

What it does Wraps the LINE Messaging API into a set of MCP tools that an AI agent can call directly. An MCP client can use it to push or broadcast text and Flex messages, query user profiles, check message quotas, enumerate followers, and manage rich menus for a LINE Official Account. It is essentially a protocol adapter: LINE on one side, MCP on the other.

The interesting bit The create_rich_menu tool bundles image generation, upload, and default assignment into a single call, which is more automation than a typical raw API wrapper. It is also notable that LINE itself built and published this adapter, rather than leaving the plumbing to third parties.

Key highlights

• Twelve MCP tools covering direct and broadcast messaging, user profiling, quota checks, and rich menu lifecycle.
• Supports Flex messages with arbitrary JSON layouts, not just plain text.
• Can paginate through follower IDs to build audience lists programmatically.
• Officially released by LINE, though still explicitly in preview.

Caveats

• Marked as a preview release; the README warns that functionality and support may be incomplete.
• Requires a pre-existing LINE Official Account with Messaging API enabled and a long-lived channel access token.

Verdict Worth exploring if you are building MCP-based agents that need to reach users on LINE. Skip it if your stack does not include MCP clients or a LINE Official Account.