How to integrate Nextdns MCP with Mastra AI

This guide walks you through connecting Nextdns to Mastra AI using the Composio tool router. By the end, you'll have a working Nextdns agent that can block access to adult websites for a profile, download dns logs from last week, show top domains queried by your devices through natural language commands. This guide will help you understand how to give your Mastra AI agent real control over a Nextdns account through Composio's Nextdns MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

Get started for freeGet a demo
Nextdns logoNextdns
Api Key

NextDNS is a DNS service that blocks malicious sites, ads, and trackers before they reach your device. It boosts your internet security and privacy with real-time protection and granular control.

68 Tools

Introduction

This guide walks you through connecting Nextdns to Mastra AI using the Composio tool router. By the end, you'll have a working Nextdns agent that can block access to adult websites for a profile, download dns logs from last week, show top domains queried by your devices through natural language commands.

This guide will help you understand how to give your Mastra AI agent real control over a Nextdns account through Composio's Nextdns MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Nextdns with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKLangChainVercel AI SDKLlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Set up your environment so Mastra, OpenAI, and Composio work together
  • Create a Tool Router session in Composio that exposes Nextdns tools
  • Connect Mastra's MCP client to the Composio generated MCP URL
  • Fetch Nextdns tool definitions and attach them as a toolset
  • Build a Mastra agent that can reason, call tools, and return structured results
  • Run an interactive CLI where you can chat with your Nextdns agent

What is Mastra AI?

Mastra AI is a TypeScript framework for building AI agents with tool support. It provides a clean API for creating agents that can use external services through MCP.

Key features include:

  • MCP Client: Built-in support for Model Context Protocol servers
  • Toolsets: Organize tools into logical groups
  • Step Callbacks: Monitor and debug agent execution
  • OpenAI Integration: Works with OpenAI models via @ai-sdk/openai

What is the Nextdns MCP server, and what's possible with it?

The Nextdns MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Nextdns account. It provides structured and secure access to your DNS security and privacy controls, so your agent can perform actions like blocking domains, managing profiles, analyzing DNS analytics, and clearing logs on your behalf.

  • Dynamic domain and TLD blocking: Instantly add domains or top-level domains to your denylist or security blocklist, helping you stay ahead of new threats.
  • Profile management and configuration: Create, update, or delete NextDNS configuration profiles to tailor DNS filtering and security settings for different users or devices.
  • Comprehensive DNS analytics: Retrieve detailed analytics by device, domain, or client IP to monitor DNS activity, spot anomalies, and optimize security policies.
  • Log management and export: Download DNS query logs for audit or troubleshooting, or clear logs entirely to maintain your privacy.
  • Control over block page settings: Enable or disable the block page for any configuration, giving you flexibility over how blocks are displayed to users.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Node.js 18 or higher
  • A Composio account with an active API key
  • An OpenAI API key
  • Basic familiarity with TypeScript
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key.
  • You need credits or a connected billing setup to use the models.
  • Store the key somewhere safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Go to Settings and copy your API key.
  • This key lets your Mastra agent talk to Composio and reach Nextdns through MCP.
3

Install dependencies

bash
npm install @composio/core @mastra/core @mastra/mcp @ai-sdk/openai dotenv

Install the required packages.

What's happening:

  • @composio/core is the Composio SDK for creating MCP sessions
  • @mastra/core provides the Agent class
  • @mastra/mcp is Mastra's MCP client
  • @ai-sdk/openai is the model wrapper for OpenAI
  • dotenv loads environment variables from .env
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio
  • COMPOSIO_USER_ID tells Composio which user this session belongs to
  • OPENAI_API_KEY lets the Mastra agent call OpenAI models
5

Import libraries and validate environment

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey as string,
});
What's happening:
  • dotenv/config auto loads your .env so process.env.* is available
  • openai gives you a Mastra compatible model wrapper
  • Agent is the Mastra agent that will call tools and produce answers
  • MCPClient connects Mastra to your Composio MCP server
  • Composio is used to create a Tool Router session
6

Create a Tool Router session for Nextdns

typescript
async function main() {
  const session = await composio.create(
    composioUserID as string,
    {
      toolkits: ["nextdns"],
    },
  );

  const composioMCPUrl = session.mcp.url;
  console.log("Nextdns MCP URL:", composioMCPUrl);
What's happening:
  • create spins up a short-lived MCP HTTP endpoint for this user
  • The toolkits array contains "nextdns" for Nextdns access
  • session.mcp.url is the MCP URL that Mastra's MCPClient will connect to
7

Configure Mastra MCP client and fetch tools

typescript
const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      nasdaq: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

console.log("Fetching MCP tools from Composio...");
const composioTools = await mcpClient.getTools();
console.log("Number of tools:", Object.keys(composioTools).length);
What's happening:
  • MCPClient takes an id for this client and a list of MCP servers
  • The headers property includes the x-api-key for authentication
  • getTools fetches the tool definitions exposed by the Nextdns toolkit
8

Create the Mastra agent

typescript
const agent = new Agent({
    name: "nextdns-mastra-agent",
    instructions: "You are an AI agent with Nextdns tools via Composio.",
    model: "openai/gpt-5",
  });
What's happening:
  • Agent is the core Mastra agent
  • name is just an identifier for logging and debugging
  • instructions guide the agent to use tools instead of only answering in natural language
  • model uses openai("gpt-5") to configure the underlying LLM
9

Set up interactive chat interface

typescript
let messages: AiMessageType[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end.\n");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "> ",
});

rl.prompt();

rl.on("line", async (userInput: string) => {
  const trimmedInput = userInput.trim();

  if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
    console.log("\nGoodbye!");
    rl.close();
    process.exit(0);
  }

  if (!trimmedInput) {
    rl.prompt();
    return;
  }

  messages.push({
    id: crypto.randomUUID(),
    role: "user",
    content: trimmedInput,
  });

  console.log("\nAgent is thinking...\n");

  try {
    const response = await agent.generate(messages, {
      toolsets: {
        nextdns: composioTools,
      },
      maxSteps: 8,
    });

    const { text } = response;

    if (text && text.trim().length > 0) {
      console.log(`Agent: ${text}\n`);
        messages.push({
          id: crypto.randomUUID(),
          role: "assistant",
          content: text,
        });
      }
    } catch (error) {
      console.error("\nError:", error);
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    console.log("\nSession ended.");
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});
What's happening:
  • messages keeps the full conversation history in Mastra's expected format
  • agent.generate runs the agent with conversation history and Nextdns toolsets
  • maxSteps limits how many tool calls the agent can take in a single run
  • onStepFinish is a hook that prints intermediate steps for debugging

Complete Code

Here's the complete code to get you started with Nextdns and Mastra AI:

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({ apiKey: composioAPIKey as string });

async function main() {
  const session = await composio.create(composioUserID as string, {
    toolkits: ["nextdns"],
  });

  const composioMCPUrl = session.mcp.url;

  const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      nextdns: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "nextdns-mastra-agent",
    instructions: "You are an AI agent with Nextdns tools via Composio.",
    model: "openai/gpt-5",
  });

  let messages: AiMessageType[] = [];

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: "> ",
  });

  rl.prompt();

  rl.on("line", async (input: string) => {
    const trimmed = input.trim();
    if (["exit", "quit"].includes(trimmed.toLowerCase())) {
      rl.close();
      return;
    }

    messages.push({ id: crypto.randomUUID(), role: "user", content: trimmed });

    const { text } = await agent.generate(messages, {
      toolsets: { nextdns: composioTools },
      maxSteps: 8,
    });

    if (text) {
      console.log(`Agent: ${text}\n`);
      messages.push({ id: crypto.randomUUID(), role: "assistant", content: text });
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main();

Conclusion

You've built a Mastra AI agent that can interact with Nextdns through Composio's Tool Router. You can extend this further by:
  • Adding other toolkits like Gmail, Slack, or GitHub
  • Building a web-based chat interface around this agent
  • Using multiple MCP endpoints to enable cross-app workflows
TOOLS

Supported Tools

Every Nextdns action and event your agent gets out of the box.

Add Allowlist Entry

Tool to add a domain to the allowlist of a NextDNS profile.

Add Blocked TLD

Tool to add a top-level domain to the security blocklist for a NextDNS profile.

Add Denylist Domain

Tool to add a domain to the denylist of a NextDNS profile.

Add Parental Control Category

Tool to add a content category to the parental control categories list.

Add Parental Control Service

Tool to add a service to the parental control services list of a NextDNS profile.

Add Privacy Blocklist

Tool to add a blocklist to the privacy blocklists for a NextDNS profile.

Add Privacy Native Tracker

Tool to add a native tracking service to the blocked list for a NextDNS profile.

Add DNS Rewrite Rule

Tool to add a DNS rewrite rule to a NextDNS profile.

Clear Logs

Tool to clear DNS logs for a NextDNS profile.

Create Profile

This tool allows users to create a new NextDNS profile.

Delete Allowlist Entry

Tool to remove a domain from a NextDNS profile's allowlist.

Delete NextDNS Configuration

Tool to delete a NextDNS configuration profile.

Delete Parental Control Category

Tool to remove a category from parental control blocked categories.

Delete Parental Control Service

Tool to remove a service from parental control blocked services.

Delete Privacy Blocklist

Tool to remove a blocklist from the privacy blocklists for a NextDNS profile.

Delete Privacy Native Tracker

Tool to remove a native tracking entry from a NextDNS profile's privacy settings.

Delete DNS Rewrite Rule

Tool to delete a DNS rewrite rule from a NextDNS profile.

Download Logs

Retrieves the download URL for exported DNS query logs from a NextDNS profile.

Get Allowlist

Tool to retrieve the list of allowed domains for a NextDNS profile.

Get Analytics Destinations

Tool to retrieve destination analytics for a profile showing query destinations by country or GAFAM company.

Get Analytics Devices

Tool to retrieve device analytics for a profile showing identified devices with names, models, and query counts.

Get Analytics DNSSEC

Tool to retrieve DNSSEC validation analytics for a profile showing validated vs non-validated query counts.

Get Analytics Domains

Tool to retrieve analytics data for domains within a specific profile.

Get Analytics Encryption

Tool to retrieve encryption analytics for a profile showing encrypted vs unencrypted query counts.

Get Analytics IPs

Tool to retrieve analytics aggregated by client IP addresses.

Get Analytics IP Versions

Tool to retrieve analytics grouped by IP version within a specific profile.

Get Analytics Protocols

Tool to retrieve protocol analytics for a specific profile showing DNS protocol distribution (DNS-over-HTTPS, DNS-over-TLS, UDP).

Get Analytics Query Types

Tool to retrieve DNS query counts broken down by query type.

Get Analytics Blocking Reasons

Tool to retrieve blocking reasons analytics showing blocklists, native tracking protection, and other reasons for blocked queries.

Get Analytics Status

Tool to retrieve analytics status for a specific profile.

Get Logs

Tool to retrieve logs for a specific NextDNS profile with optional filters.

Get Parental Control Settings

Tool to get parental control settings for a profile.

Get Parental Control Categories

Tool to get the list of blocked/allowed content categories for parental control.

Get Parental Control Services

Tool to get the list of blocked/allowed services for parental control.

Get Performance Settings

Tool to get performance settings for a profile including ECS, cache boost, and CNAME flattening configuration.

Get Privacy Settings

Tool to get privacy settings for a profile including blocklists, native tracking settings, disguised trackers, and affiliate settings.

Get Profile Details

Retrieves the details of a specific NextDNS profile.

Get DNS Rewrites

Tool to retrieve the list of DNS rewrites for a NextDNS profile.

Get Security TLDs

Tool to get the list of blocked TLDs (top-level domains) for a profile's security settings.

Get Profile Settings

Tool to get all settings for a NextDNS profile including logs, block page, performance, and web3 settings.

Get Block Page Settings

Tool to retrieve the block page settings for a NextDNS profile.

Get Logging Settings

Tool to retrieve the logging settings for a NextDNS profile.

List Denylist Domains

Tool to list domains in the denylist for a profile.

List Profiles

List all NextDNS profiles for the authenticated user, returning profile IDs and configurations.

List Security Settings

Tool to list current security options for a NextDNS configuration.

Log Client IPs

Tool to enable or disable logging of client IPs for a NextDNS configuration.

Toggle Domain Logging

Tool to enable or disable logging of domains for a NextDNS profile.

Remove Blocked TLD

Tool to remove a top-level domain from the security blocklist for a NextDNS profile.

Remove Denylist Domain

Removes a domain from a NextDNS profile's denylist (blocklist).

Rename Configuration

Tool to rename a NextDNS configuration (profile).

Replace Allowlist

Tool to replace the entire allowlist for a NextDNS profile.

Replace Denylist

Tool to replace the entire denylist (blocked domains) for a NextDNS profile.

Replace Parental Control Categories

Tool to replace the entire list of blocked/allowed content categories for parental control.

Replace Parental Control Services

Tool to replace the entire list of blocked/allowed services for parental control.

Replace Privacy Blocklists

Tool to replace the entire list of privacy blocklists for a NextDNS profile.

Replace Privacy Native Tracking Services

Tool to replace the entire list of blocked native tracking services for a NextDNS profile.

Replace Security TLDs

Tool to replace the entire list of blocked TLDs (top-level domains) for a NextDNS profile's security settings.

Update Allowlist Entry

Tool to update a specific allowlist entry in a NextDNS profile.

Update Denylist Entry

Updates a specific denylist entry in a NextDNS profile, typically to toggle its active status.

Update linked IP

Updates the linked IP address for a NextDNS profile to the current caller's public IP.

Update Parental Control Settings

Tool to update parental control settings for a NextDNS profile.

Update Parental Control Category

Tool to update a specific category entry in parental control settings.

Update Parental Control Service

Tool to update a specific service entry in parental control settings.

Update Performance Settings

Tool to update performance settings of a NextDNS profile.

Update Privacy Settings

Tool to update privacy settings for a profile.

Update Security Settings

Tool to update security settings for a profile.

Update Settings

Tool to update settings for a NextDNS profile including logs, block page, performance, and web3 settings.

Update Block Page Settings

Tool to update block page settings for a NextDNS profile.

FRAMEWORKS

How to build Nextdns MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Nextdns MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Nextdns MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Nextdns MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Nextdns MCP with Claude Cowork

Codex logo

Codex

Use Nextdns MCP with Codex

OpenClaw logo

OpenClaw

Use Nextdns MCP with OpenClaw

Hermes logo

Hermes

Use Nextdns MCP with Hermes

CLI logo

CLI

Use Nextdns MCP with CLI

Google ADK logo

Google ADK

Use Nextdns MCP with Google ADK

LangChain logo

LangChain

Use Nextdns MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Nextdns MCP with Vercel AI SDK

LlamaIndex logo

LlamaIndex

Use Nextdns MCP with LlamaIndex

CrewAI logo

CrewAI

Use Nextdns MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Nextdns MCP server, the agents and LLMs can only access a fixed set of Nextdns tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Nextdns and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Mastra AI fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Nextdns tools.

Yes, absolutely. You can configure which Nextdns scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Nextdns data and credentials are handled as safely as possible.

Start with Nextdns.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Nextdns tool your agent needs.Free to start.

Start building
Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREEBOOK A DEMO
agent.aiZoomLettaGleanHubSpotAWSWabi

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola
Tomisin Jenrola
Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche
Jerome Leclanche
Co-Founder, Ingram Technologies