LINE Launches Official MCP Server to Let AI Agents Control Messaging Accounts

LINE has released an official MCP server for its Messaging API, enabling AI agents like Codex, Claude Desktop, and Cline to manage a LINE Official Account — including sending messages, broadcasting promotions, and creating Flex Message cards — without writing API code. A developer tested the full setup using Codex and documented the entire process, from account creation to delivering a message to a real device. The guide highlights three key gaps between LINE's documentation and actual behavior, including a 403 error on get_follower_ids for unverified free accounts and a conflict between LINE's security config and the rich menu tool's browser dependency. Codex, being a coding-first agent, was found to default to writing scripts rather than calling MCP tools directly, which can be corrected by naming the tool explicitly in the prompt. The author also warns that broadcasts cannot be undone, recommending that users configure agent approval prompts before any message is sent.
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