# How to integrate Signpath MCP with LangChain

```json
{
  "title": "How to integrate Signpath MCP with LangChain",
  "toolkit": "Signpath",
  "toolkit_slug": "signpath",
  "framework": "LangChain",
  "framework_slug": "langchain",
  "url": "https://composio.dev/toolkits/signpath/framework/langchain",
  "markdown_url": "https://composio.dev/toolkits/signpath/framework/langchain.md",
  "updated_at": "2026-05-12T10:26:12.005Z"
}
```

## Introduction

This guide walks you through connecting Signpath to LangChain using the Composio tool router. By the end, you'll have a working Signpath agent that can list all available code signing certificates, show all projects for your organization, get details of current signing policies through natural language commands.
This guide will help you understand how to give your LangChain agent real control over a Signpath account through Composio's Signpath MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Signpath with

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

## TL;DR

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

The Signpath MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Signpath account. It provides structured and secure access to your code signing workflows, so your agent can list certificates, retrieve project details, access signing policies, and check system metadata automatically on your behalf.
- Certificate management and discovery: Quickly list all available code signing certificates within your organization, making it easy for your agent to select the right certificate for each workflow.
- Automated project listing and tracking: Let your agent fetch and paginate through all Signpath projects, helping you organize, monitor, and automate signing across multiple software projects.
- Signing policy insights and selection: Effortlessly retrieve detailed information about your organization’s signing policies, so your agent can ensure every artifact is signed according to security best practices.
- System information and environment awareness: Instantly access Signpath system details, including product info, API version, and environment metadata, to keep your agent up to date with the latest platform capabilities.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `SIGNPATH_GET_HEALTH_CHECK` | Get Health Check | Tool to check if the SignPath API is healthy and operational. Use this to verify API availability before performing other operations. |
| `SIGNPATH_LIST_CERTIFICATES` | List Certificates | Retrieve all certificates available in a SignPath organization. Use this to discover certificate IDs needed for signing operations. Requires a valid organization_id which can be obtained from your SignPath account settings. |
| `SIGNPATH_LIST_PROJECTS` | List Projects | Tool to list all projects for an organization. Use after confirming the organization ID to retrieve and paginate project records. |
| `SIGNPATH_RETRIEVE_SIGNING_POLICY_DETAILS` | Retrieve Signing Policy Details | Retrieve signing policy details for code signing operations. Returns certificate info, RSA key parameters, and policy metadata for the authenticated user's accessible signing policies. Without filters, returns all policies where the user is assigned as Submitter. |
| `SIGNPATH_RETRIEVE_SYSTEM_INFO` | Retrieve System Info | Retrieves SignPath system information including the application version and the web UI base URL. Use this tool to verify the SignPath installation version or to obtain the web interface URL. |

## Supported Triggers

None listed.

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

The Signpath MCP server is an implementation of the Model Context Protocol that connects your AI agent to Signpath. It provides structured and secure access so your agent can perform Signpath 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 Signpath 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 Signpath 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 Signpath tools as needed
```python
# Create Tool Router session for Signpath
session = composio.create(
    user_id=os.getenv("COMPOSIO_USER_ID"),
    toolkits=['signpath']
)

url = session.mcp.url
```

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

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

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

No description provided.
```python
client = MultiServerMCPClient({
    "signpath-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({
    "signpath-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 Signpath 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 Signpath 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=['signpath']
    )

    url = session.mcp.url
    
    client = MultiServerMCPClient({
        "signpath-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 Signpath 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: ['signpath']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "signpath-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 Signpath 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 Signpath 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 Signpath MCP Agent with another framework

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

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- [Blocknative](https://composio.dev/toolkits/blocknative) - Blocknative delivers real-time mempool monitoring and transaction management for public blockchains. Instantly track pending transactions and optimize blockchain interactions with live data.

## Frequently Asked Questions

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

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

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

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

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