How to integrate PDFgen MCP with LangChain

This guide walks you through connecting PDFgen to LangChain using the Composio tool router. By the end, you'll have a working PDFgen agent that can create templates, update your templates, generate pdfs, view your account, and review usage logs through natural language commands. This guide will help you understand how to give your LangChain agent real control over a PDFgen account through Composio's PDFgen MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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PDFgen is a document generation service for creating PDFs from templates, HTML, Markdown, or natural-language prompts. It helps teams produce reusable, consistent PDFs while tracking templates and usage logs.

8 Tools

Introduction

This guide walks you through connecting PDFgen to LangChain using the Composio tool router. By the end, you'll have a working PDFgen agent that can create templates, update your templates, generate pdfs, view your account, and review usage logs through natural language commands.

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

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

Also integrate PDFgen 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 PDFgen project to Composio
  • Create a Tool Router MCP session for PDFgen
  • Initialize an MCP client and retrieve PDFgen tools
  • Build a LangChain agent that can interact with PDFgen
  • 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 PDFgen MCP server, and what's possible with it?

The PDFgen MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your PDFgen account. It provides structured and secure access to your PDF generation, templates, account details, and usage history, so your agent can create templates, generate PDFs, manage saved templates, review credit usage, and inspect recent activity on your behalf.

  • Flexible PDF generation: Have your agent generate PDFs from saved templates, HTML, Markdown, or natural-language prompts and provide a temporary download link.
  • Reusable template creation: Let the agent create reusable HTML templates for invoices, reports, certificates, and other recurring documents.
  • Template management: Direct your agent to list, review, update, or permanently delete templates saved in your PDFgen account.
  • Account and credit monitoring: Instruct your agent to check your account, organization, plan, and current credit usage.
  • Usage review and troubleshooting: Have your agent inspect recent PDFgen activity to support audits, review billing, or investigate generation issues.

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 PDFgen 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 PDFgen 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: ['pdfgen']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to PDFgen 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 PDFgen tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "pdfgen-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 PDFgen MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available PDFgen 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 PDFgen 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 PDFgen 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: ['pdfgen']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "pdfgen-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 PDFgen 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 PDFgen 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 PDFgen action and event your agent gets out of the box.

Create Template

Create a reusable HTML template for later PDF generation.

Delete Template

Permanently delete one saved template owned by the connected account.

Generate PDF

Generate a PDF from exactly one saved template, HTML document, Markdown document, or AI prompt and return a temporary download URL.

Get Account

Return the connected PDFgen account, organization, plan, and current credit usage.

Get Template

Get one saved PDFgen template, including its complete HTML content.

List Templates

List saved PDF templates owned by the connected account and return one page with a continuation cursor.

List Usage Logs

List recent PDFgen API calls for auditing, billing inspection, and generation troubleshooting.

Update Template

Partially update a saved template's name, HTML content, or rendering engine without replacing omitted fields.

FRAMEWORKS

How to build PDFgen MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use PDFgen MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use PDFgen MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use PDFgen MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use PDFgen MCP with Claude Cowork

Codex logo

Codex

Use PDFgen MCP with Codex

OpenClaw logo

OpenClaw

Use PDFgen MCP with OpenClaw

Hermes logo

Hermes

Use PDFgen MCP with Hermes

CLI logo

CLI

Use PDFgen MCP with CLI

Google ADK logo

Google ADK

Use PDFgen MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use PDFgen MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use PDFgen MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use PDFgen MCP with LlamaIndex

CrewAI logo

CrewAI

Use PDFgen MCP with CrewAI

FAQ

Frequently asked questions

With a standalone PDFgen MCP server, the agents and LLMs can only access a fixed set of PDFgen tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from PDFgen 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 PDFgen tools.

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

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