How to integrate Dropbox sign MCP with LangChain

This guide walks you through connecting Dropbox sign to LangChain using the Composio tool router. By the end, you'll have a working Dropbox sign agent that can send nda for signature to new hire, get status of recent signature requests, download signed contract from last week through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Dropbox sign account through Composio's Dropbox sign MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Dropbox Sign is an electronic signature platform for sending, signing, and managing legally binding documents online. It streamlines business workflows by making signature collection fast, secure, and effortless.

56 Tools

Introduction

This guide walks you through connecting Dropbox sign to LangChain using the Composio tool router. By the end, you'll have a working Dropbox sign agent that can send nda for signature to new hire, get status of recent signature requests, download signed contract from last week through natural language commands.

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

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

Also integrate Dropbox sign with

ChatGPTOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenCodeCursorVS CodeOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Dropbox sign project to Composio
  • Create a Tool Router MCP session for Dropbox sign
  • Initialize an MCP client and retrieve Dropbox sign tools
  • Build a LangChain agent that can interact with Dropbox sign
  • 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 Dropbox sign MCP server, and what's possible with it?

The Dropbox sign MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Dropbox Sign account. It provides structured and secure access to your e-signature workflows, so your agent can prepare signature requests, manage documents, track signing progress, and automate agreement workflows on your behalf.

  • Automated signature requests: Have your agent create, send, and manage legally binding signature requests to one or multiple recipients, streamlining document approval processes.
  • Template-based document preparation: Let your agent generate documents from templates, pre-fill fields, and quickly send out repeat agreements without manual editing.
  • Status tracking and reminders: Ask your agent to monitor the progress of signature requests, check who has signed, and send automated reminders to outstanding signers as needed.
  • Secure document storage and retrieval: Effortlessly fetch completed, pending, or archived documents, download signed agreements, and keep your workflow organized and compliant.
  • Audit trails and activity logs: Access detailed audit trails and event histories for every document, so you can maintain compliance and always know who did what, and when.

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 Dropbox sign 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 Dropbox sign 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: ['dropbox_sign']
    }
);

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

Configure the agent with the MCP URL

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

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

Invite User to Team

Tool to invite a user to your Team.

Add User to Template

Tool to grant a specified account access to a template.

Bulk create embedded signature request with template

Tool to create a BulkSendJob for embedded templated signature requests.

Bulk send with template

Tool to create a BulkSendJob for templated signature requests.

Cancel Signature Request

Cancels an incomplete signature request.

Create Dropbox Sign Account

Tool to create a new Dropbox Sign account associated with a specified email address.

Create API App

Tool to create a new Dropbox Sign API App.

Create Embedded Signature Request

Tool to create an embedded signature request for signing in an iFrame.

Create Embedded Signature Request With Template

Tool to create an embedded signature request based on a template.

Create Embedded Template Draft

Tool to create an embedded template draft.

Create Embedded Unclaimed Draft with Template

Tool to create an embedded unclaimed draft using saved templates.

Create Report

Request creation of CSV report(s) for a specified date range.

Create Template

Tool to create a reusable template for document signing workflows.

Create Unclaimed Draft

Tool to create an unclaimed draft that can be claimed via a unique URL.

Delete API App

Tool to delete an API App from your Dropbox Sign account by its client_id.

Delete Fax

Tool to delete a fax from the system by its fax_id.

Delete Template

Permanently deletes a template from your Dropbox Sign account by its template_id.

Download Signature Request Files

Download files for a signature request as PDF (merged) or ZIP (individual documents).

Edit and Resend Embedded Signature Request

Tool to edit and resend an embedded signature request.

Edit and Resend Signature Request

Edits and resends an existing non-templated signature request with updated documents, signers, or settings.

Edit and Resend Unclaimed Draft

Tool to edit and resend a previously created unclaimed draft.

Edit and Resend Embedded Signature Request With Template

Tool to edit and resend an embedded signature request using templates.

Get Dropbox Sign Account

Retrieves detailed information about a Dropbox Sign account including quotas, payment status, and settings.

Get API App

Tool to retrieve information about an API App by its client ID.

Get Bulk Send Job

Tool to retrieve the status of a bulk send job.

Get Current Team Membership

Tool to get the current team membership status and details.

Get Embedded Sign URL

Retrieves an embedded signing URL for a specific signer's signature.

Get Embedded Template Edit URL

Tool to generate an edit URL for embedded template editing.

Get Available Fax Line Area Codes

Tool to retrieve available fax line area codes for a given country, state/province, and city.

Get Signature Request

Retrieves the current status and complete details of a signature request by ID.

Get Signature Request Files as Data URI

Tool to download signature request files as a base64-encoded data URI.

Get Signature Request Files as File URL

Retrieves a copy of the current documents and returns a JSON object with a URL to the file (PDFs only).

Get Team Info

Retrieves information about a Dropbox Sign team, including team name, member count, and sub-team count.

Get Template

Tool to return the specified template.

Download Template Files

Tool to download documents associated with a template.

Get Template Files as Data URI

Tool to retrieve template documents as base64-encoded data URI.

Get Template Files as File URL

Tool to retrieve a copy of template documents and return a JSON object with a URL to the file (PDFs only).

List API Apps

Tool to list API Apps.

List Bulk Send Jobs

Tool to list bulk send jobs.

List Faxes

Tool to list faxes and their properties.

List Fax Lines

Tool to list fax lines and their properties.

List Signature Requests

Tool to list signature requests.

List Sub-Teams

Lists all sub-teams belonging to a parent team with pagination support.

List Team Members

Lists all members and their roles for a specific team.

List All Teams

Lists all Dropbox Sign teams accessible to the authenticated user, including the current team and its sub-teams.

List Templates

Tool to list templates.

Generate OAuth Authorization URL

Tool to generate an OAuth authorization URL.

Release Signature Request Hold

Release a held signature request to send it to signers.

Remove User from Template

Tool to remove an account's access to a template.

Send Signature Request

Tool to create and send a new signature request with documents.

Send Request Reminder

Sends an email reminder to a signer about a pending signature request.

Update Dropbox Sign Account

Tool to update Dropbox Sign account properties and settings.

Update API App

Tool to update an existing API App in Dropbox Sign.

Update Signature Request

Updates the email address and/or name for a specific signer on a signature request.

Update Template Files

Tool to update files for an existing template.

Verify Dropbox Sign Account

Tool to verify whether a Dropbox Sign account exists for the given email.

FRAMEWORKS

How to build Dropbox sign MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Dropbox sign MCP with ChatGPT

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Dropbox sign MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Dropbox sign MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Dropbox sign MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Dropbox sign MCP with Claude Cowork

Codex logo

Codex

Use Dropbox sign MCP with Codex

Cursor logo

Cursor

Use Dropbox sign MCP with Cursor

OpenClaw logo

OpenClaw

Use Dropbox sign MCP with OpenClaw

Hermes logo

Hermes

Use Dropbox sign MCP with Hermes

CLI logo

CLI

Use Dropbox sign MCP with CLI

Google ADK logo

Google ADK

Use Dropbox sign MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Dropbox sign MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Dropbox sign MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Dropbox sign MCP with LlamaIndex

CrewAI logo

CrewAI

Use Dropbox sign MCP with CrewAI

OpenCode logo

OpenCode

Use Dropbox sign MCP with OpenCode

VS Code logo

VS Code

Use Dropbox sign MCP with VS Code

FAQ

Frequently asked questions

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

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

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Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
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.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

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.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

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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Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

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Co-Founder, Ingram Technologies