How to integrate Craftmypdf MCP with LangChain

This guide walks you through connecting Craftmypdf to LangChain using the Composio tool router. By the end, you'll have a working Craftmypdf agent that can list all available pdf templates, generate invoice pdf using latest template, create embeddable editor session for contract through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Craftmypdf account through Composio's Craftmypdf MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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CraftMyPDF is a web-based service for designing and generating PDFs with templates and live data. It streamlines document creation by automating personalized PDFs at scale.

12 Tools

Introduction

This guide walks you through connecting Craftmypdf to LangChain using the Composio tool router. By the end, you'll have a working Craftmypdf agent that can list all available pdf templates, generate invoice pdf using latest template, create embeddable editor session for contract through natural language commands.

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

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

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

The Craftmypdf MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, and others directly to your Craftmypdf account. It provides structured and secure access to your PDF templates and document generation workflows, so your agent can create PDFs, manage templates, launch editor sessions, and automate document processes on your behalf.

  • Template management and discovery: Effortlessly retrieve and browse your available PDF templates so your agent can select the right one for each task.
  • Automated PDF generation: Queue up asynchronous PDF creation jobs using dynamic data, letting your agent generate custom documents on the fly and handle results via webhooks.
  • Embeddable editor session creation: Instantly generate secure, embeddable editor session URLs for specific templates, making it easy to edit or customize PDFs in real-time through an assistant.
  • Seamless integration into document workflows: Empower your agent to combine template selection and PDF generation for end-to-end automation of personalized document creation.

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 Craftmypdf 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 Craftmypdf 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: ['craftmypdf']
    }
);

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

Configure the agent with the MCP URL

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

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

Add Text to PDF

Tool to add text annotations to a PDF including page numbers, watermarks, and custom text at specified positions.

Add Watermark to PDF

Tool to add a text watermark to a PDF with customizable font, size, color, opacity, and rotation.

Create Editor Session

Tool to create an embeddable editor session URL for a template.

Create PDF Asynchronously (Extended)

Tool to create a PDF file asynchronously with JSON data and template.

Create PDFs in Parallel

Tool to create multiple PDF files in parallel from templates with JSON data.

Get Account Information

Tool to retrieve account information including subscription and usage details.

Get PDF Information

Tool to retrieve information about a PDF file including metadata, page count, and other properties.

List PDF Templates

Tool to retrieve a paginated list of PDF templates.

List API Transactions

Tool to retrieve a paginated list of API transactions.

Merge PDF Files

Tool to merge multiple PDF files from URLs into a single PDF document.

Query Template Usage Statistics

Tool to retrieve usage statistics for specified templates within a date range.

Update PDF Fields

Tool to update fillable fields in a PDF document such as text fields, checkboxes, and dropdowns.

FRAMEWORKS

How to build Craftmypdf MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Craftmypdf MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Craftmypdf MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Craftmypdf MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Craftmypdf MCP with Claude Cowork

Codex logo

Codex

Use Craftmypdf MCP with Codex

OpenClaw logo

OpenClaw

Use Craftmypdf MCP with OpenClaw

Hermes logo

Hermes

Use Craftmypdf MCP with Hermes

CLI logo

CLI

Use Craftmypdf MCP with CLI

Google ADK logo

Google ADK

Use Craftmypdf MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Craftmypdf MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Craftmypdf MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Craftmypdf MCP with LlamaIndex

CrewAI logo

CrewAI

Use Craftmypdf MCP with CrewAI

FAQ

Frequently asked questions

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

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

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