# How to integrate Laposta MCP with LangChain ```json { "title": "How to integrate Laposta MCP with LangChain", "toolkit": "Laposta", "toolkit_slug": "laposta", "framework": "LangChain", "framework_slug": "langchain", "url": "https://composio.dev/toolkits/laposta/framework/langchain", "markdown_url": "https://composio.dev/toolkits/laposta/framework/langchain.md", "updated_at": "2026-03-29T06:40:02.341Z" } ``` ## Introduction This guide walks you through connecting Laposta to LangChain using the Composio tool router. By the end, you'll have a working Laposta agent that can add subscriber to laposta list by email, send campaign to "monthly updates" group, get open rates for last laposta campaign through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Laposta account through Composio's Laposta MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Laposta with - [OpenAI Agents SDK](https://composio.dev/toolkits/laposta/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/laposta/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/laposta/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/laposta/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/laposta/framework/codex) - [OpenClaw](https://composio.dev/toolkits/laposta/framework/openclaw) - [Hermes](https://composio.dev/toolkits/laposta/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/laposta/framework/cli) - [Google ADK](https://composio.dev/toolkits/laposta/framework/google-adk) - [Vercel AI SDK](https://composio.dev/toolkits/laposta/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/laposta/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/laposta/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/laposta/framework/crew-ai) ## TL;DR Here's what you'll learn: - Get and set up your OpenAI and Composio API keys - Connect your Laposta project to Composio - Create a Tool Router MCP session for Laposta - Initialize an MCP client and retrieve Laposta tools - Build a LangChain agent that can interact with Laposta - 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 Laposta MCP server, and what's possible with it? The Laposta MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Laposta account. It provides structured and secure access so your agent can perform Laposta operations on your behalf. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `LAPOSTA_CAMPAIGN_GET_ALL` | Get All Campaigns | Tool to retrieve all campaigns from Laposta account. Use when you need to list all email campaigns with their configuration and delivery status. | | `LAPOSTA_FIELD_CREATE` | Create Custom Field | Tool to create a custom field for a mailing list to define subscriber attributes. Use when you need to add custom fields like text, numeric, date, or select fields to a list. For select fields (select_single or select_multiple), you must provide the options parameter. | | `LAPOSTA_FIELD_DELETE` | Delete Field | Tool to permanently remove a custom field from a mailing list. Use when you need to delete a field that is no longer needed. | | `LAPOSTA_FIELD_GET` | Get Field Details | Tool to retrieve specific field details by field_id. Use when you need to fetch complete information about a custom field including its configuration, data type, and available options. | | `LAPOSTA_GET_ALL_FIELDS` | Get All Fields | Tool to retrieve all fields for a specific list in Laposta. Use when you need to see all field definitions, metadata, and settings for a list. | | `LAPOSTA_UPDATE_FIELD` | Update Field | Tool to modify field configuration in a Laposta list. Use when you need to update field properties such as name, datatype, required status, or display settings. WARNING: Modifying datatype removes all data from that field. | | `LAPOSTA_CLEAR_ALL_MEMBERS_FROM_LIST` | Clear All Members From List | Tool to clear all active members from a list. Use when you need to remove all active member relationships while preserving the list itself. The operation is permanent and cannot be undone. | | `LAPOSTA_CREATE_MAILING_LIST` | Create Mailing List | Tool to create a new mailing list in Laposta to manage email subscribers. Use when you need to create a new list with zero members. | | `LAPOSTA_DELETE_LIST` | Delete List | Tool to permanently remove a mailing list from Laposta. Use when you need to delete a list that is no longer needed. The list cannot be recovered after deletion. | | `LAPOSTA_GET_LIST_DETAILS` | Get List Details | Tool to retrieve specific list details by list_id. Use when you need to fetch complete information about a mailing list including its metadata, state, notification settings, and member statistics. | | `LAPOSTA_GET_ALL_LISTS` | Get All Lists | Tool to retrieve all mailing lists from your Laposta account. Use when you need to view all lists including both active and deleted ones. | | `LAPOSTA_UPDATE_MAILING_LIST` | Update Mailing List | Tool to modify list properties such as name, remarks, or notification emails. Use when you need to update an existing mailing list's configuration. | | `LAPOSTA_CREATE_MEMBER` | Create Member | Tool to add a new subscriber relationship to a list with custom fields and tracking info. Use when you need to create a new member in a list or update an existing member if upsert is enabled. | | `LAPOSTA_DELETE_MEMBER` | Delete Member | Tool to permanently remove a member from a list. Use when you need to delete a member by their ID or email address. | | `LAPOSTA_GET_MEMBER` | Get Member | Tool to retrieve specific member details by member_id or email. Use when you need to get comprehensive information about a member from a list, including their status, registration details, and custom field values. | | `LAPOSTA_GET_ALL_MEMBERS` | Get All Members | Tool to retrieve all members from a specified Laposta mailing list. Use when you need to list or view all contacts in a list. Optionally filter by member state (active, unsubscribed, or cleaned). | | `LAPOSTA_UPDATE_MEMBER` | Update Member | Tool to modify member data, status, or custom fields in a Laposta list. Use when updating existing member information or managing subscription state. Supports partial updates (only modified fields need to be included). | | `LAPOSTA_GET_ALL_CAMPAIGN_REPORTS` | Get All Campaign Reports | Tool to retrieve performance metrics for all campaigns. Use when you need campaign statistics including opens, clicks, bounces, complaints, and unsubscribes. | | `LAPOSTA_GET_ALL_SEGMENTS` | Get All Segments | Tool to retrieve all segments from a mailing list. Use when you need to list or browse segments within a specific list. | | `LAPOSTA_CREATE_WEBHOOK` | Create Webhook | Tool to register a new webhook for list events in Laposta. Use when you need to receive real-time notifications for subscriber events like subscriptions, modifications, or deactivations. | | `LAPOSTA_DELETE_WEBHOOK` | Delete Webhook | Tool to permanently remove a webhook. Use when you need to delete a webhook from a list. Pending webhook requests are completed before deletion. | | `LAPOSTA_GET_WEBHOOK_DETAILS` | Get Webhook Details | Tool to retrieve specific webhook details by webhook_id. Use when you need to inspect webhook configuration including event type, URL, and status. | | `LAPOSTA_GET_ALL_WEBHOOKS` | Get All Webhooks | Tool to retrieve all webhooks for a specific list. Use when you need to view all webhooks configured for a particular list. | | `LAPOSTA_UPDATE_WEBHOOK` | Update Webhook | Tool to modify webhook configuration including URL, event type, or blocked status. Use when you need to update an existing webhook's settings. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Laposta MCP server is an implementation of the Model Context Protocol that connects your AI agent to Laposta. It provides structured and secure access so your agent can perform Laposta 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 Laposta 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 Laposta 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 Laposta tools as needed ```python # Create Tool Router session for Laposta session = composio.create( user_id=os.getenv("COMPOSIO_USER_ID"), toolkits=['laposta'] ) url = session.mcp.url ``` ```typescript const session = await composio.create( userId as string, { toolkits: ['laposta'] } ); const url = session.mcp.url; ``` ### 7. Configure the agent with the MCP URL No description provided. ```python client = MultiServerMCPClient({ "laposta-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({ "laposta-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 Laposta 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 Laposta 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=['laposta'] ) url = session.mcp.url client = MultiServerMCPClient({ "laposta-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 Laposta 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: ['laposta'] } ); const url = session.mcp.url; const client = new MultiServerMCPClient({ "laposta-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 Laposta 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 Laposta 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 Laposta MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/laposta/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/laposta/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/laposta/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/laposta/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/laposta/framework/codex) - [OpenClaw](https://composio.dev/toolkits/laposta/framework/openclaw) - [Hermes](https://composio.dev/toolkits/laposta/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/laposta/framework/cli) - [Google ADK](https://composio.dev/toolkits/laposta/framework/google-adk) - [Vercel AI SDK](https://composio.dev/toolkits/laposta/framework/ai-sdk) - [Mastra AI](https://composio.dev/toolkits/laposta/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/laposta/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/laposta/framework/crew-ai) ## Related Toolkits - [Reddit](https://composio.dev/toolkits/reddit) - Reddit is a social news platform with thriving user-driven communities (subreddits). It's the go-to place for discussion, content sharing, and viral marketing. - [Facebook](https://composio.dev/toolkits/facebook) - Facebook is a social media and advertising platform for businesses and creators. It helps you connect, share, and manage content across your public Facebook Pages. - [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections. - [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach. - [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease. - [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. It helps you improve search rankings and drive organic traffic. - [Amcards](https://composio.dev/toolkits/amcards) - AMCards lets you create and mail personalized greeting cards online. Build stronger customer relationships with easy, automated card campaigns. - [Beamer](https://composio.dev/toolkits/beamer) - Beamer is a news and changelog platform for in-app announcements and feature updates. It helps companies boost user engagement by sharing news where users are most active. - [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place. - [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES. - [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere. - [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. It helps businesses engage customers and streamline communications through powerful campaign tools. - [Campayn](https://composio.dev/toolkits/campayn) - Campayn is an email marketing platform for creating, sending, and managing campaigns. It helps businesses engage contacts and grow audiences with easy-to-use tools. - [Cardly](https://composio.dev/toolkits/cardly) - Cardly is a platform for creating and sending personalized direct mail to customers. It helps businesses break through the digital clutter by getting real engagement via physical mailboxes. - [ClickSend](https://composio.dev/toolkits/clicksend) - ClickSend is a cloud-based SMS and email marketing platform for businesses. It streamlines communication by enabling quick message delivery and contact management. - [Crustdata](https://composio.dev/toolkits/crustdata) - CrustData is an AI-powered data intelligence platform for real-time company and people data. It helps B2B sales teams, AI SDRs, and investors react to live business signals. - [Curated](https://composio.dev/toolkits/curated) - Curated is a platform for collecting, curating, and publishing newsletters. It streamlines content aggregation and distribution for creators and teams. - [Customerio](https://composio.dev/toolkits/customerio) - Customer.io is a customer engagement platform for targeted messaging across email, SMS, and push. Easily automate, segment, and track communications with your audience. - [Cutt ly](https://composio.dev/toolkits/cutt_ly) - Cutt.ly is a URL shortening service for managing and analyzing links. Streamline your workflows with quick, trackable, and branded short URLs. - [Demio](https://composio.dev/toolkits/demio) - Demio is webinar software built for marketers, offering both live and automated sessions with interactive features. It helps teams engage audiences and optimize lead generation through detailed analytics. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Laposta MCP? With a standalone Laposta MCP server, the agents and LLMs can only access a fixed set of Laposta tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Laposta 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 Laposta tools. ### Can I manage the permissions and scopes for Laposta while using Tool Router? Yes, absolutely. You can configure which Laposta 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 Laposta data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)