How to integrate Dungeon fighter online MCP with LangChain

This guide walks you through connecting Dungeon fighter online to LangChain using the Composio tool router. By the end, you'll have a working Dungeon fighter online agent that can show all servers available this week, find characters named arin on cain server, get latest status info for your character through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Dungeon fighter online account through Composio's Dungeon fighter online MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Dungeon Fighter Online (DFO) is an arcade-style, side-scrolling action RPG packed with dynamic combat and progression. Play solo or with friends to battle monsters, complete quests, and upgrade your characters.

25 Tools

Introduction

This guide walks you through connecting Dungeon fighter online to LangChain using the Composio tool router. By the end, you'll have a working Dungeon fighter online agent that can show all servers available this week, find characters named arin on cain server, get latest status info for your character through natural language commands.

This guide will help you understand how to give your LangChain agent real control over a Dungeon fighter online account through Composio's Dungeon fighter online MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Dungeon fighter online with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Dungeon fighter online project to Composio
  • Create a Tool Router MCP session for Dungeon fighter online
  • Initialize an MCP client and retrieve Dungeon fighter online tools
  • Build a LangChain agent that can interact with Dungeon fighter online
  • Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

  • Agent Framework: Build agents that can use tools and make decisions
  • MCP Integration: Connect to external services through Model Context Protocol adapters
  • Memory Management: Maintain conversation history across interactions
  • Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

What is the Dungeon fighter online MCP server, and what's possible with it?

The Dungeon fighter online MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Dungeon Fighter Online account. It provides structured and secure access to your character and server data, so your agent can perform actions like searching for characters, retrieving character stats, checking equipment, and exploring timelines on your behalf.

  • Character search and discovery: Effortlessly search for characters by name on any available server or fetch detailed character lists.
  • Comprehensive character stats retrieval: Instantly pull base information and detailed status, including active buffs and skill information, for any character you own.
  • Equipment and avatar inspection: View your character's equipped items and inspect skill buff avatar gear to optimize your loadout.
  • Timeline and history tracking: Retrieve and review a character's timeline to see recent game activities and progression milestones.
  • Server information lookup: Quickly access the full list of available DFO servers to stay up to date with the game environment.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step10 STEPS
1

Prerequisites

Before starting this tutorial, make sure you have:
  • Python 3.10 or higher installed on your system
  • A Composio account with an API key
  • An OpenAI API key
  • Basic familiarity with Python and async programming
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

  • @composio/langchain provides Composio integration for LangChain
  • @langchain/mcp-adapters enables MCP client connections
  • @langchain/core is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio's API
  • COMPOSIO_USER_ID identifies the user for session management
  • OPENAI_API_KEY enables access to OpenAI's language models
5

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();
What's happening:
  • We're importing LangChain's MCP adapter and Composio SDK
  • The dotenv/config import loads environment variables from your .env file
  • This setup prepares the foundation for connecting LangChain with Dungeon fighter online functionality through MCP
6

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });
What's happening:
  • We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
  • Creating a Composio instance that will manage our connection to Dungeon fighter online tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['dungeon_fighter_online']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Dungeon fighter online tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned session.mcp.url is the MCP server URL that your agent will use
  • This approach allows the agent to dynamically load and use Dungeon fighter online tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "dungeon_fighter_online-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });
What's happening:
  • We're creating a MultiServerMCPClient that connects to our Dungeon fighter online MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Dungeon fighter online tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Dungeon fighter online related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });
What's happening:
  • We initialize an empty conversationHistory list to maintain context across interactions
  • A readline interface is used to continuously accept user input from the command line
  • When a user types a message, it's added to the conversation history and sent to the agent
  • The agent processes the request using the invoke() method with the full conversation history
  • Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully
10

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});
What's happening:
  • We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Dungeon fighter online and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['dungeon_fighter_online']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "dungeon_fighter_online-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Dungeon fighter online related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    rl.prompt();

    rl.on('line', async (userInput: string) => {
        const trimmedInput = userInput.trim();
        
        if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
            console.log("\nGoodbye!");
            rl.close();
            process.exit(0);
        }
        
        if (!trimmedInput) {
            rl.prompt();
            return;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Dungeon fighter online through Composio's Tool Router.

Key features of this implementation:

  • Dynamic tool loading through Composio's Tool Router
  • Conversation history maintenance for context-aware responses
  • Async Python provides clean, efficient execution of agent workflows
You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS

Supported Tools

Every Dungeon fighter online action and event your agent gets out of the box.

Character Base Information

Retrieves comprehensive base information for a Dungeon & Fighter Online character, including level, job details, fame, adventure/account info, and guild membership.

Character Search

Search for Dungeon Fighter Online characters by name on a specific server.

Get Character Skill Buff Avatar

Retrieves detailed information about a character's buff skill and equipped avatars that enhance it.

Get Character Skill Buff Status

Tool to fetch character's skill buff status information.

Character Status Info

Tool to retrieve status information of a specific character.

Character Timeline

Retrieves the activity timeline for a specific character in Dungeon Fighter Online.

Get Character Avatar Equipment

Retrieves comprehensive information about a character's equipped avatar items in Dungeon Fighter Online.

Get Character Buff Skill Creature

Retrieves detailed information about a character's buff skill creature equipment.

Get Character Creature

Tool to retrieve equipped creature information for a Dungeon & Fighter Online character.

Get Character Equipment

Retrieves comprehensive equipment information for a Dungeon & Fighter Online character.

Get Character Equipped Insignia

Retrieves character equipped insignia (flag) information from Dungeon Fighter Online.

Get Character Skill Buff Equipment

Retrieves detailed information about a character's skill buff equipment, including the buff skill details and equipment items that enhance the buff.

Get Character Skill Style

Tool to retrieve character skill style information.

Get Item Hashtags

Tool to retrieve the list of all available item hashtags for searching items.

Get Item Information

Retrieves detailed information for a specific item in Dungeon & Fighter Online.

Get Item Shop Info

Tool to retrieve item shop sell information for specific equipment.

Get Jobs List

Tool to retrieve the list of all available character classes (jobs) in Dungeon Fighter Online.

Get Job Skills

Tool to retrieve the complete list of skills available for a specific character class and advancement.

Get Multiple Items

Tool to retrieve detailed information for multiple items at once.

Get Multiple Skills Information

Retrieves information for multiple skills of a character class at once.

Get Server List

Tool to retrieve the list of available game servers.

Get Skill Information

Tool to retrieve detailed information for a specific skill of a character class.

Search Characters By Fame

Tool to search characters by fame ranking.

Search Items

Search for Dungeon Fighter Online items by name or hashtag.

Search Set Items

Search for Dungeon Fighter Online set items by name.

FRAMEWORKS

How to build Dungeon fighter online MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

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Claude Agent SDK logo

Claude Agent SDK

Use Dungeon fighter online MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Dungeon fighter online MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Dungeon fighter online MCP with Claude Cowork

Codex logo

Codex

Use Dungeon fighter online MCP with Codex

OpenClaw logo

OpenClaw

Use Dungeon fighter online MCP with OpenClaw

Hermes logo

Hermes

Use Dungeon fighter online MCP with Hermes

CLI logo

CLI

Use Dungeon fighter online MCP with CLI

Google ADK logo

Google ADK

Use Dungeon fighter online MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Dungeon fighter online MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Dungeon fighter online MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Dungeon fighter online MCP with LlamaIndex

CrewAI logo

CrewAI

Use Dungeon fighter online MCP with CrewAI

FAQ

Frequently asked questions

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

Yes, you can. LangChain 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 Dungeon fighter online tools.

Yes, absolutely. You can configure which Dungeon fighter online 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 Dungeon fighter online data and credentials are handled as safely as possible.

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Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

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As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

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Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

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