JustCall MCP Server for LangChainGive LangChain instant access to 12 tools to Create Contact, Get Account Profile, Get Call Details, and more

Name: JustCall
Price: 29 USD
Availability: InStock
Rating: 5.0 (1 reviews)
Author: Vinkius

GDPR Free for Subscribers

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

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The JustCall MCP Server for LangChain is a standout in the Customer Support category — giving your AI agent 12 tools to work with, ready to go from day one.

Built for AI Agents by Vinkius

Vinkius delivers Streamable HTTP and SSE to any MCP client

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ChatGPT

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VS Code

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+ other MCP clients

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({
        "justcall-alternative": {
            "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 JustCall, 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 JustCall MCP Server

Connect your JustCall account to any AI agent and manage phone communications through natural conversation.

LangChain's ecosystem of 500+ components combines seamlessly with JustCall through native MCP adapters. Connect 12 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

Call Management — Make outbound calls, track call logs with duration and status
SMS Messaging — Send text messages to contacts and track delivery
Contact Database — List contacts, create new entries, and inspect profiles
Call Recordings — Access call recordings with metadata
Phone Numbers — List available and assigned phone numbers
Agent Monitoring — Track agent performance, call volumes, and availability

The JustCall MCP Server exposes 12 tools through the Vinkius. Connect it to LangChain in under two minutes — credentials fully managed, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

All 12 JustCall tools available for LangChain

When LangChain connects to JustCall through Vinkius, your AI agent gets direct access to every tool listed below — spanning cloud-phone, sms-messaging, call-logging, and more. Every call runs in a secure, isolated environment with full audit visibility. Beyond a simple connection, you get real-time monitoring of agent activity, enterprise governance, and optimized token usage.

create

Create contact on JustCall

Create a new contact

get

Get account profile on JustCall

Get my profile

get

Get call details on JustCall

Get call details

get

Get contact on JustCall

Get contact details

get

Get message details on JustCall

Get message details

list

List account numbers on JustCall

List JustCall numbers

list

List calls on JustCall

List phone calls

list

List contacts on JustCall

List phone contacts

list

List messages on JustCall

List SMS/MMS messages

list

List team users on JustCall

List team members

list

List webhooks on JustCall

List active webhooks

send

Send message on JustCall

Send SMS/MMS

Connect JustCall to LangChain via MCP

Follow these steps to wire JustCall into LangChain. The entire setup takes under two minutes — your credentials stay safe behind Vinkius.

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 12 tools from JustCall via MCP

Why Use LangChain with the JustCall MCP Server

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

The largest ecosystem of integrations, chains, and agents. combine JustCall 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 JustCall queries for multi-turn workflows

JustCall + LangChain Use Cases

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

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

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

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

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

Example Prompts for JustCall in LangChain

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

"Show today's call log and send a follow-up SMS to the last caller."

"List all agents, their call volumes, and available phone numbers."

"Show call recordings from this week and the contact database."

Troubleshooting JustCall MCP Server with LangChain

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

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

JustCall + LangChain FAQ

Common questions about integrating JustCall 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.