What do the statuses 'clean' and 'dirty' mean?

'Clean' means the email address is valid and safe to send. 'Dirty' means the email is invalid, non-existent, or highly likely to bounce.

How many emails can I verify at once?

The `verify_batch_emails` tool supports JSON arrays. It is recommended to keep batches under 3,000 emails per request for optimal performance.

Where do I find my API Key?

Log in to your Listclean dashboard and navigate to Account Settings or Profile to find your unique X-Auth-Token.

Listclean MCP Server for LangChain 5 tools — connect in under 2 minutes

Name: Listclean
Availability: InStock
Author: Vinkius

python.langchain.com/docs/integrations/tools/mcp

Built by Vinkius GDPR 5 Tools Framework

LangChain is the leading Python framework for composable LLM applications. Connect Listclean through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    async with MultiServerMCPClient({
        "listclean": {
            "transport": "streamable_http",
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
        }
    }) as client:
        tools = client.get_tools()
        agent = create_react_agent(
            ChatOpenAI(model="gpt-4o"),
            tools,
        )
        response = await agent.ainvoke({
            "messages": [{
                "role": "user",
                "content": "Using Listclean, show me what tools are available.",
            }]
        })
        print(response["messages"][-1].content)

asyncio.run(main())

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Listclean MCP Server

Connect your Listclean account to any AI agent to automate your email hygiene and deliverability workflows. This MCP server enables your agent to verify single email addresses instantly, process batch validations, and monitor your verification credits directly from natural language interfaces.

LangChain's ecosystem of 500+ components combines seamlessly with Listclean through native MCP adapters. Connect 5 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.

What you can do

Real-time Verification — Instantly check if an email address is clean, dirty, or risky before sending
Batch Processing — Validate large lists of email addresses (up to 3,000 per request) efficiently
History Oversight — Retrieve logs of previously performed single verifications to track your activity
Credit Management — Monitor your remaining verification credits to ensure uninterrupted service
Data Quality Audit — Identify catch-all, disposable, and role-based emails to maintain a high-quality contact list

The Listclean MCP Server exposes 5 tools through the Vinkius. Connect it to LangChain in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Listclean to LangChain via MCP

Follow these steps to integrate the Listclean MCP Server with LangChain.

Install dependencies

Run pip install langchain langchain-mcp-adapters langgraph langchain-openai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save the code and run python agent.py

Explore tools

The agent discovers 5 tools from Listclean via MCP

Why Use LangChain with the Listclean MCP Server

LangChain provides unique advantages when paired with Listclean through the Model Context Protocol.

The largest ecosystem of integrations, chains, and agents. combine Listclean MCP tools with 500+ LangChain components

Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step

LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging

Memory and conversation persistence let agents maintain context across Listclean queries for multi-turn workflows

Listclean + LangChain Use Cases

Practical scenarios where LangChain combined with the Listclean MCP Server delivers measurable value.

RAG with live data: combine Listclean tool results with vector store retrievals for answers grounded in both real-time and historical data

Autonomous research agents: LangChain agents query Listclean, synthesize findings, and generate comprehensive research reports

Multi-tool orchestration: chain Listclean tools with web scrapers, databases, and calculators in a single agent run

Production monitoring: use LangSmith to trace every Listclean tool call, measure latency, and optimize your agent's performance

Listclean MCP Tools for LangChain (5)

These 5 tools become available when you connect Listclean to LangChain via MCP:

check_account_credits

Check remaining verification credits

get_account_profile

Get account profile details

get_verification_logs

Retrieve logs of previously verified single emails

verify_batch_emails

Maximum recommended size is 3,000 per request. Verify multiple email addresses in one batch

verify_single_email

Requires a single email string. Verify a single email address in real-time

Example Prompts for Listclean in LangChain

Ready-to-use prompts you can give your LangChain agent to start working with Listclean immediately.

"Verify the email address 'test@example.com' in Listclean."

"Show my recent email verification logs."

"How many verification credits do I have left?"

Troubleshooting Listclean MCP Server with LangChain

Common issues when connecting Listclean to LangChain through the Vinkius, and how to resolve them.

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

Listclean + LangChain FAQ

Common questions about integrating Listclean MCP Server with LangChain.

How does LangChain connect to MCP servers?

Use langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.

Which LangChain agent types work with MCP?

All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.