How to Use the MailerLite MCP in Mastra AI

Build resilient, multi-step email marketing workflows with Mastra AI and the MailerLite MCP Server.

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Connect MailerLite MCP to Mastra AI

Create your Vinkius account to connect MailerLite 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 MailerLite with Mastra AI

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Automate Subscriber Routing with Mastra AI Workflows

The `create_group` tool lets your Mastra AI agents build custom subscriber segments based on user behavior. When a user trigger fires, your agent can categorize them into highly specific groups without writing manual conditional routing code. Mastra's workflow engine handles the execution logic, ensuring that if a group creation step fails, the system automatically retries with exponential backoff before moving to the next subscriber sync step.

Fail-Safe Subscriber Updates via MCP Server

The `upsert_subscriber` tool updates subscriber profiles and mapped fields during complex data migrations. Mastra AI agents use this tool to sync customer profiles from external databases directly into MailerLite. By using Mastra's built-in error handling, you can ensure that custom field updates don't fail silently. If the API returns a rate limit error, the agent pauses, backs off, and resumes the upsert automatically.

Human-in-the-Loop Campaign Auditing

The `list_campaigns` tool retrieves your draft and sent campaigns so your Mastra AI agent can audit them for consistency. You can configure the agent to run regular checks on your email copy and performance metrics using this MCP connection. By enabling Mastra's human-in-the-loop validation, your agent can flag suspicious metrics or drafts and pause the workflow. It only resumes once you approve the next step in your terminal or dashboard.

Setup guide

Set up MailerLite 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 MailerLite 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: "mailerlite-alternative-mcp-client",
  servers: {
    "mailerlite-alternative-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

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

const result = await agent.generate(
  "List recent MailerLite 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 MailerLite. 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.

Why Choose Vinkius

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

Connect MailerLite now

Real-time monitoring

Live

visibility into every interaction

Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

Vinkius compresses data between your apps and your AI automatically. Lower bills every month — no configuration required.

Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about MailerLite MCP in Mastra AI

Install the package using npm install @mastra/mcp@latest. Initialize new MCPClient with your Vinkius credentials, call listTools(), and spread them directly into your Mastra agent's tool configuration array.

Yes, Mastra AI uses a built-in workflow engine that supports automatic retries with exponential backoff. If tools like list_subscribers trigger a rate limit, Mastra pauses the execution and retries without failing the workflow.

Use the requireToolApproval setting in Mastra when registering the list_campaigns or create_group tools. This forces the agent to halt and request developer confirmation before executing the action.

Yes, Mastra AI auto-detects the transport protocol. It connects directly to your Vinkius-hosted MailerLite MCP setup using either Streamable HTTP or Server-Sent Events (SSE) depending on your hosting environment.

All subscriber custom fields and email addresses retrieved via list_custom_fields are processed in ephemeral V8 isolates. No customer data is written to persistent storage on Vinkius, maintaining strict GDPR compliance.

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