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Vercel AI SDKSDK
JustCall MCP Server

Bring Cloud Phone
to Vercel AI SDK

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

MCP Inspector GDPR Free for Subscribers
Create ContactGet Account ProfileGet Call DetailsGet ContactGet Message DetailsList Account NumbersList CallsList ContactsList MessagesList Team UsersList WebhooksSend Message
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ChatGPT Claude Perplexity

Compatible with every major AI agent and IDE

ClaudeClaude
ChatGPTChatGPT
CursorCursor
GeminiGemini
WindsurfWindsurf
VS CodeVS Code
JetBrainsJetBrains
VercelVercel
+ other MCP clients
JustCall

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

  1. Subscribe to this server
  2. Enter your JustCall API Key and API Secret
  3. 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 Vercel AI SDK?

The Vercel AI SDK gives every JustCall tool full TypeScript type inference, IDE autocomplete, and compile-time error checking. Connect 12 tools through Vinkius and stream results progressively to React, Svelte, or Vue components. works on Edge Functions, Cloudflare Workers, and any Node.js runtime.

  • —

    TypeScript-first: every MCP tool gets full type inference, IDE autocomplete, and compile-time error checking out of the box

  • —

    Framework-agnostic core works with Next.js, Nuxt, SvelteKit, or any Node.js runtime. same JustCall integration everywhere

  • —

    Built-in streaming UI primitives let you display JustCall tool results progressively in React, Svelte, or Vue components

  • —

    Edge-compatible: the AI SDK runs on Vercel Edge Functions, Cloudflare Workers, and other edge runtimes for minimal latency

See it in action

JustCall in Vercel AI SDK

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 Vercel AI SDK 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 catalogFind and host yourself4,000+ managed
InfrastructureSelf-hostedSandboxed V8 isolates
Credential handlingPlaintext in configVault + runtime injection
Data loss preventionNoneConfigurable DLP policies
Kill switchNoneGlobal instant shutdown
Financial circuit breakersNonePer-server limits + alerts
Audit trailNoneEd25519 signed logs
SIEM log streamingNoneSplunk, Datadog, Webhook
HoneytokensNoneCanary alerts on leak
Custom domainsNot applicableDNS challenge verified
GDPR complianceManual effortAutomated purge + export
Unlock for AI Agents View step-by-step setup guide for Vercel AI SDK →
Enterprise Security

Why teams choose Vinkius for JustCall in Vercel AI SDK

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 Vercel AI SDK 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 →
JustCall
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 Vercel AI SDK

Every tool call from Vercel AI SDK 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

01

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.

02

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.

03

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.

04

How does the Vercel AI SDK connect to MCP servers?

Import createMCPClient from @ai-sdk/mcp and pass the server URL. The SDK discovers all tools and provides typed TypeScript interfaces for each one.

05

Can I use MCP tools in Edge Functions?

Yes. The AI SDK is fully edge-compatible. MCP connections work on Vercel Edge Functions, Cloudflare Workers, and similar runtimes.

06

Does it support streaming tool results?

Yes. The SDK provides streaming primitives like useChat and streamText that handle tool calls and display results progressively in the UI.

07

createMCPClient is not a function

Install: npm install @ai-sdk/mcp

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