# How to integrate Oksign MCP with LangChain

```json
{
  "title": "How to integrate Oksign MCP with LangChain",
  "toolkit": "Oksign",
  "toolkit_slug": "oksign",
  "framework": "LangChain",
  "framework_slug": "langchain",
  "url": "https://composio.dev/toolkits/oksign/framework/langchain",
  "markdown_url": "https://composio.dev/toolkits/oksign/framework/langchain.md",
  "updated_at": "2026-03-29T06:43:52.545Z"
}
```

## Introduction

This guide walks you through connecting Oksign to LangChain using the Composio tool router. By the end, you'll have a working Oksign agent that can send signature request for nda document, list all pending signature requests, download signed contract for order #12345 through natural language commands.
This guide will help you understand how to give your LangChain agent real control over a Oksign account through Composio's Oksign MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Oksign with

- [OpenAI Agents SDK](https://composio.dev/toolkits/oksign/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/oksign/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/oksign/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/oksign/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/oksign/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/oksign/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/oksign/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/oksign/framework/cli)
- [Google ADK](https://composio.dev/toolkits/oksign/framework/google-adk)
- [Vercel AI SDK](https://composio.dev/toolkits/oksign/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/oksign/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/oksign/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/oksign/framework/crew-ai)

## TL;DR

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

The Oksign MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Oksign account. It provides structured and secure access so your agent can perform Oksign operations on your behalf.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `OKSIGN_BRIEFCASE_REMOVE` | Remove Briefcase | Tool to remove a previously created briefcase from OKSign platform. Use when you need to delete a briefcase that is no longer needed. The briefcase is identified by the token received when it was created. |
| `OKSIGN_BRIEFCASE_RETRIEVE` | Retrieve Briefcase Information | Tool to retrieve a previously uploaded briefcase tokeninfo for consultation. Use when you need to examine bundled document properties and signer requirements without re-creating the briefcase. |
| `OKSIGN_CONTACTS_REMOVE` | Remove Contacts | Tool to remove specified contacts from the account's contact list. Use when you need to delete one or more contacts by providing their name and email. |
| `OKSIGN_CONTACTS_RETRIEVE` | Retrieve Contacts | Tool to retrieve the list of contacts stored in the account. Use when you need to access all contacts with their details including name, email, mobile number, and role. |
| `OKSIGN_UPLOAD_CONTACTS` | Upload Contacts | Tool to insert or update contact information in the account's contact list. Use when you need to add new contacts or update existing ones with details like name, email, phone, mobile, address, company, or identifier. |
| `OKSIGN_RETRIEVE_ACCOUNT_CREDITS` | Retrieve Account Credits | Tool to retrieve account credit balance and storage information. Use when you need to check available credits or storage capacity. |
| `OKSIGN_CHECK_DOCUMENT_EXISTS` | Check Document Exists | Tool to check if a signed or unsigned document still exists on the OKSign platform. Use when you need to verify document availability before performing operations. |
| `OKSIGN_REMOVE_DOCUMENT` | Remove Document | Tool to remove a signed or unsigned document from the OKSign platform. Use when you need to delete a document and its signed copies from storage. Note: If document is removed immediately after signing while platform processes notifications, service may return FAILED status with retry message. |
| `OKSIGN_UPLOAD_DOCUMENT` | Upload Document | Tool to upload a PDF or Word document to OKSign platform for completion and/or signing. Use when you need to add a new document that requires signatures. Maximum file size is 10 MB. Supported formats: PDF, DOC, DOCX. |
| `OKSIGN_CREATE_EDITOR_EXPRESS_SESSION` | Create Editor Express Session | Tool to invoke the OKSign Editor Express for modifying documents and form descriptors. Use when you need to open documents in an interactive editor where users can add signature fields, form fields, and configure signing workflows. The editor URL returned can be embedded or redirected to within your application. |
| `OKSIGN_UPLOAD_FORM_DESCRIPTOR` | Upload Form Descriptor | Tool to upload form descriptor defining signature fields and other field types to a document. Use when you need to add form fields, signature areas, and configure signing workflows for a document. |
| `OKSIGN_GET_ACTIVE_DOCUMENTS` | Get Active Documents | Tool to retrieve all active document IDs and properties from OKsign account. Use when you need to list documents visible in the Active Documents tab. Note: Rate limited to 1 request per 3 minutes. |
| `OKSIGN_RETRIEVE_LINKED_DOCUMENT_LIST` | Retrieve Linked Document List | Tool to retrieve the list of linked signed or source document IDs related to a specific document. Use when you need to find linked documents (either the signed version of a source document, or the source of a signed document). |
| `OKSIGN_UPLOAD_NOTIFICATIONS` | Upload Notifications | Tool to upload notifications defining email(s) and/or SMS(es) to be sent to signer(s) with signing links. Use when you need to send notification emails or SMS messages to document signers. |
| `OKSIGN_UPDATE_ORGANIZATION_TOKEN_INFO` | Update Organization Token Info | Tool to update organizational token information and settings for the account. Use when you need to configure or modify callback URL, webhook URL, or return URL for the organization's token. |
| `OKSIGN_REMOVE_SIGNEXPRESS_TOKEN` | Remove SignExpress Token | Tool to remove a previously uploaded SignExpress tokeninfo JSONObject from the OKSign platform. Use when you need to clean up or invalidate a SignExpress token that was created for sign button integration. |
| `OKSIGN_RETRIEVE_USERS` | Retrieve Users | Tool to retrieve the list of users associated with the OkSign account. Use when you need to get all users in an account. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Oksign MCP server is an implementation of the Model Context Protocol that connects your AI agent to Oksign. It provides structured and secure access so your agent can perform Oksign operations on your behalf through a secure, permission-based interface.
With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster.

## Step-by-step Guide

### 1. Prerequisites

No description provided.

### 1. Getting API Keys for OpenAI and Composio

OpenAI API Key
- Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) 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](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs).
- Navigate to your API settings and generate a new API key.
- Store this key securely as you'll need it for authentication.

### 2. Install dependencies

No description provided.
```python
pip install composio-langchain langchain-mcp-adapters langchain python-dotenv
```

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

### 3. Set up environment variables

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
```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
```

### 4. Import dependencies

No description provided.
```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain.agents import create_agent
from dotenv import load_dotenv
from composio import Composio
import asyncio
import os

load_dotenv()
```

```typescript
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();
```

### 5. Initialize Composio client

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 Oksign tools
- Validating that COMPOSIO_USER_ID is also set before proceeding
```python
async def main():
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))

    if not os.getenv("COMPOSIO_API_KEY"):
        raise ValueError("COMPOSIO_API_KEY is not set")
    if not os.getenv("COMPOSIO_USER_ID"):
        raise ValueError("COMPOSIO_USER_ID is not set")
```

```typescript
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()
    });
```

### 6. Create a Tool Router session

What's happening:
- We're creating a Tool Router session that gives your agent access to Oksign 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 Oksign tools as needed
```python
# Create Tool Router session for Oksign
session = composio.create(
    user_id=os.getenv("COMPOSIO_USER_ID"),
    toolkits=['oksign']
)

url = session.mcp.url
```

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

const url = session.mcp.url;
```

### 7. Configure the agent with the MCP URL

No description provided.
```python
client = MultiServerMCPClient({
    "oksign-agent": {
        "transport": "streamable_http",
        "url": session.mcp.url,
        "headers": {
            "x-api-key": os.getenv("COMPOSIO_API_KEY")
        }
    }
})

tools = await client.get_tools()

agent = create_agent("gpt-5", tools)
```

```typescript
const client = new MultiServerMCPClient({
    "oksign-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 });
```

### 8. Set up interactive chat interface

No description provided.
```python
conversation_history = []

print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
print("Ask any Oksign related question or task to the agent.\n")

while True:
    user_input = input("You: ").strip()

    if user_input.lower() in ['exit', 'quit', 'bye']:
        print("\nGoodbye!")
        break

    if not user_input:
        continue

    conversation_history.append({"role": "user", "content": user_input})
    print("\nAgent is thinking...\n")

    response = await agent.ainvoke({"messages": conversation_history})
    conversation_history = response['messages']
    final_response = response['messages'][-1].content
    print(f"Agent: {final_response}\n")
```

```typescript
let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Oksign 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);
    });
```

### 9. Run the application

No description provided.
```python
if __name__ == "__main__":
    asyncio.run(main())
```

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

## Complete Code

```python
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain.agents import create_agent
from dotenv import load_dotenv
from composio import Composio
import asyncio
import os

load_dotenv()

async def main():
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))
    
    if not os.getenv("COMPOSIO_API_KEY"):
        raise ValueError("COMPOSIO_API_KEY is not set")
    if not os.getenv("COMPOSIO_USER_ID"):
        raise ValueError("COMPOSIO_USER_ID is not set")
    
    session = composio.create(
        user_id=os.getenv("COMPOSIO_USER_ID"),
        toolkits=['oksign']
    )

    url = session.mcp.url
    
    client = MultiServerMCPClient({
        "oksign-agent": {
            "transport": "streamable_http",
            "url": url,
            "headers": {
                "x-api-key": os.getenv("COMPOSIO_API_KEY")
            }
        }
    })
    
    tools = await client.get_tools()
  
    agent = create_agent("gpt-5", tools)
    
    conversation_history = []
    
    print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
    print("Ask any Oksign related question or task to the agent.\n")
    
    while True:
        user_input = input("You: ").strip()
        
        if user_input.lower() in ['exit', 'quit', 'bye']:
            print("\nGoodbye!")
            break
        
        if not user_input:
            continue
        
        conversation_history.append({"role": "user", "content": user_input})
        print("\nAgent is thinking...\n")
        
        response = await agent.ainvoke({"messages": conversation_history})
        conversation_history = response['messages']
        final_response = response['messages'][-1].content
        print(f"Agent: {final_response}\n")

if __name__ == "__main__":
    asyncio.run(main())
```

```typescript
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: ['oksign']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "oksign-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 Oksign 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 Oksign 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.

## How to build Oksign MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/oksign/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/oksign/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/oksign/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/oksign/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/oksign/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/oksign/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/oksign/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/oksign/framework/cli)
- [Google ADK](https://composio.dev/toolkits/oksign/framework/google-adk)
- [Vercel AI SDK](https://composio.dev/toolkits/oksign/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/oksign/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/oksign/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/oksign/framework/crew-ai)

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- [Monday](https://composio.dev/toolkits/monday) - Monday.com is a customizable work management platform for project planning and collaboration. It helps teams organize tasks, automate workflows, and track progress in real time.
- [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time.
- [Aeroleads](https://composio.dev/toolkits/aeroleads) - Aeroleads is a B2B lead generation platform for finding business emails and phone numbers. Grow your sales pipeline faster with powerful prospecting tools.
- [Affinda](https://composio.dev/toolkits/affinda) - Affinda is an AI-powered document processing platform that automates data extraction from resumes, invoices, and more. It streamlines document-heavy workflows by turning files into structured, actionable data.
- [Agiled](https://composio.dev/toolkits/agiled) - Agiled is an all-in-one business management platform for CRM, projects, and finance. It helps you streamline workflows, consolidate client data, and manage business processes in one place.
- [Agility cms](https://composio.dev/toolkits/agility_cms) - Agility CMS is a headless content management system for building and managing digital experiences across platforms. It lets teams update content quickly and deliver omnichannel experiences with ease.
- [Algodocs](https://composio.dev/toolkits/algodocs) - Algodocs is an AI-powered platform that automates data extraction from business documents. It delivers fast, secure, and accurate processing without templates or manual training.
- [Api2pdf](https://composio.dev/toolkits/api2pdf) - Api2Pdf is a REST API for generating PDFs from HTML, URLs, and documents using powerful engines like wkhtmltopdf and Headless Chrome. It streamlines document conversion and automation for developers and businesses.
- [Aryn](https://composio.dev/toolkits/aryn) - Aryn is an AI-powered platform for parsing, extracting, and analyzing data from unstructured documents. Use it to automate document processing and unlock actionable insights from your files.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Oksign MCP?

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

### Can I use Tool Router MCP with LangChain?

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 Oksign tools.

### Can I manage the permissions and scopes for Oksign while using Tool Router?

Yes, absolutely. You can configure which Oksign 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.

### How safe is my data with Composio Tool Router?

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 Oksign data and credentials are handled as safely as possible.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)