LINE Bot MCP Server (SSE Support)

Instructions

Implementation Reference

• src/tools/broadcastFlexMessage.ts:27-38 (handler)

  The implementation of the broadcast_flex_message handler, which uses the LINE MessagingApiClient to broadcast the message.

  async ({ message }) => {
    try {
      const response = await this.client.broadcast({
        messages: [message as unknown as messagingApi.Message],
      });
      return createSuccessResponse(response);
    } catch (error) {
      return createErrorResponse(
        `Failed to broadcast message: ${error.message}`,
      );
    }
  },

• src/tools/broadcastFlexMessage.ts:18-40 (registration)

  The registration method for the broadcast_flex_message tool using the McpServer.

  register(server: McpServer) {
    server.tool(
      "broadcast_flex_message",
      "Broadcast a highly customizable flex message via LINE to all users who have added your LINE Official Account. " +
        "Supports both bubble (single container) and carousel (multiple swipeable bubbles) layouts. Please be aware that " +
        "this message will be sent to all users.",
      {
        message: flexMessageSchema,
      },
      async ({ message }) => {
        try {
          const response = await this.client.broadcast({
            messages: [message as unknown as messagingApi.Message],
          });
          return createSuccessResponse(response);
        } catch (error) {
          return createErrorResponse(
            `Failed to broadcast message: ${error.message}`,
          );
        }
      },
    );
  }