LangChainFramework

JustCall MCP Server

Bring Cloud Phone
to LangChain

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

Learn how to connect JustCall to LangChain and start using 12 AI agent tools in minutes. Fully managed, enterprise secure, and ready to use without writing a single line of code.

GDPR Free for Subscribers

Create ContactGet Account ProfileGet Call DetailsGet ContactGet Message DetailsList Account NumbersList CallsList ContactsList MessagesList Team UsersList WebhooksSend Message

Unlock for AI Agents

Ask AI about this MCP Server ChatGPT Claude Perplexity

Compatible with every major AI agent and IDE

Claude

ChatGPT

Cursor

Gemini

Windsurf

VS Code

JetBrains

Vercel

+ other MCP clients

What is the JustCall MCP Server?

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

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

How it works

Subscribe to this server
Enter your JustCall API Key and API Secret
Start managing calls from Claude, Cursor, or any MCP-compatible client

Who is this for?

Sales Teams — make calls, send follow-up SMS, and track communication history
Support Teams — manage call queues and monitor agent performance
Operations — automate phone outreach and SMS campaigns

Built-in capabilities (12)

create_contact

Create a new contact

get_account_profile

Get my profile

get_call_details

Get call details

get_contact

Get contact details

get_message_details

Get message details

list_account_numbers

List JustCall numbers

list_calls

List phone calls

list_contacts

List phone contacts

list_messages

List SMS/MMS messages

list_team_users

List team members

list_webhooks

List active webhooks

send_message

Send SMS/MMS

Why LangChain?

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.

—
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

See it in action

JustCall in LangChain

AI Agent→Vinkius

High Security·Kill Switch·Plug and Play

Why Vinkius

JustCall and 4,000+ other MCP servers. One platform. One governance layer.

Teams that connect JustCall to LangChain through Vinkius don't need to source, host, or maintain individual MCP servers. Every tool call runs inside a hardened runtime with credential isolation, DLP, and a signed audit chain.

4,000+MCP Servers ready

<40msCold start

60%Token savings

	Raw MCP	Vinkius
Server catalog	Find and host yourself	4,000+ managed
Infrastructure	Self-hosted	Sandboxed V8 isolates
Credential handling	Plaintext in config	Vault + runtime injection
Data loss prevention	None	Configurable DLP policies
Kill switch	None	Global instant shutdown
Financial circuit breakers	None	Per-server limits + alerts
Audit trail	None	Ed25519 signed logs
SIEM log streaming	None	Splunk, Datadog, Webhook
Honeytokens	None	Canary alerts on leak
Custom domains	Not applicable	DNS challenge verified
GDPR compliance	Manual effort	Automated purge + export

Unlock for AI Agents View step-by-step setup guide for LangChain →

Enterprise Security

Why teams choose Vinkius for JustCall in LangChain

The JustCall 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. All 12 tools execute in hardened sandboxes optimized for native MCP execution.

Your AI agents in LangChain only access the data you authorize, with DLP that blocks sensitive information from ever reaching the model, kill switch for instant shutdown, and up to 60% token savings. Enterprise-grade infrastructure, zero maintenance.

Unlock for AI Agents View full JustCall details →

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

The Vinkius Advantage

How Vinkius secures
JustCall for LangChain

Every tool call from LangChain to the JustCall MCP Server is protected by DLP redaction, cryptographic audit chains, V8 sandbox isolation, kill switch, and financial circuit breakers.

< 40msCold start

Ed25519Signed audit chain

60%Token savings

FAQ

Frequently asked questions

Can I make calls and send SMS through the AI agent?

Yes. Make outbound calls with destination number and track status. Send SMS messages to any contact with delivery tracking. Use contact management tools to find recipient numbers.

Does JustCall require two credentials?

Yes. JustCall uses an API Key and API Secret pair for authentication. Both are sent as Bearer credentials against api.justcall.io/v1.

Can I listen to call recordings and track agent performance?

Yes. Access call recordings with duration and metadata. Monitor agent call volumes, average handle time, and availability status.

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.

Can I trace MCP tool calls in LangSmith?

Yes. All MCP tool invocations appear as traced steps in LangSmith, showing input parameters, response payloads, latency, and token usage.

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

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