How to Use the JustCall MCP in Mastra AI

Q: How do I add JustCall tools to a Mastra AI agent?

Install @mastra/mcp and instantiate the MCPClient pointing to your Vinkius endpoint. Call listTools() on the client and spread those tools directly into your agent configuration. The framework automatically registers all ten communication tools for your agent to use.

Q: Can I trigger workflows based on new JustCall call recordings in Mastra AI?

Yes, you can set up a workflow that periodically checks listrecordings for new audio files. Once a new recording appears, your agent can download the file, transcribe it, and update the associated contact record automatically.

Build reliable, automated phone and SMS workflows with Mastra AI and the JustCall MCP integration.

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Create your Vinkius account to connect JustCall to Mastra AI and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup JustCall with Mastra AI

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Automated Dialer Campaign Audits

The `list_campaigns` tool retrieves active dialer campaigns and their performance metrics. Mastra's workflow engine uses this data to decide whether to scale up outbound calls or pause a campaign based on agent availability. You can build conditional branches that trigger automatically when campaign performance drops. If a dialer campaign stalls, your agent detects it and alerts the team via SMS using other nodes in your graph.

Resilient Webhook Monitoring via Mastra AI MCP Server

The `list_webhooks` tool audits your active integration endpoints to ensure call events sync correctly. Mastra AI uses this to verify that your CRM is receiving webhook payloads without silent failures. If a webhook fails, the built-in retry logic kicks in with exponential backoff. This keeps your system running without manual intervention, saving hours of debugging time for your engineering team.

Smart Call Escalation

The `list_users` tool identifies which agents are online and available to take calls. When an urgent customer issue arises, your workflow searches this list to route the ticket to the right person. Combining this with `list_calls` lets you track which agent handled a specific call. Your workflow can automatically assign follow-up tasks to the same agent, keeping customer context consistent.

Setup guide

Set up JustCall MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All JustCall tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "justcall-mcp-client",
  servers: {
    "justcall-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "JustCall Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to JustCall tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent JustCall transactions"
);
console.log(result.text);

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by JustCall. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about JustCall MCP in Mastra AI

Install `@mastra/mcp` and instantiate the `MCPClient` pointing to your Vinkius endpoint. Call `listTools()` on the client and spread those tools directly into your agent configuration. The framework automatically registers all ten communication tools for your agent to use.

Yes, the workflow engine handles API rate limits and network blips automatically. If a call to `list_messages` or `get_contact` fails, the system retries the request using exponential backoff. You don't have to write custom error-handling code for these network failures.

You can configure Mastra to require manual approval before running sensitive MCP tools. For instance, you can block the agent from pulling sensitive contact details until an admin approves the action. This keeps your communication data safe.

Yes, you can set up a workflow that periodically checks `list_recordings` for new audio files. Once a new recording appears, your agent can download the file, transcribe it, and update the associated contact record automatically.

Your contact databases and phone records remain isolated within a secure, ephemeral sandbox environment. Vinkius executes the server code with zero-trust protocols, ensuring that phone numbers and customer profiles are never cached on external servers. All credentials are encrypted and injected only at runtime.

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