How to integrate Nextdns MCP with Google ADK

This guide walks you through connecting Nextdns to Google ADK 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 Google ADK 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.

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Introduction

This guide will help you understand how to give your Google ADK 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 SDK Claude Agent SDK Claude Code Claude Cowork Codex OpenClaw Hermes CLI LangChain Vercel AI SDK Mastra AI LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

Get a Nextdns account set up and connected to Composio
Install the Google ADK and Composio packages
Create a Composio Tool Router session for Nextdns
Build an agent that connects to Nextdns through MCP
Interact with Nextdns using natural language

What is Google ADK?

Google ADK (Agents Development Kit) is Google's framework for building AI agents powered by Gemini models. It provides tools for creating agents that can use external services through the Model Context Protocol.

Key features include:

Gemini Integration: Native support for Google's Gemini models
MCP Toolset: Built-in support for Model Context Protocol tools
Streamable HTTP: Connect to external services through streamable HTTP
CLI and Web UI: Run agents via command line or web interface

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:

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

Step-by-step Guide

Step by step09 STEPS

Prerequisites

Before starting, make sure you have:

A Google API key for Gemini models
A Composio account and API key
Python 3.9 or later installed
Basic familiarity with Python

Getting API Keys for Google and Composio

Google API Key

Go to Google AI Studio and create an API key.
Copy the key and keep it safe. You will put this in GOOGLE_API_KEY.

Composio API Key and User ID

Log in to the Composio dashboard.
Go to Settings → API Keys and copy your Composio API key. Use this for COMPOSIO_API_KEY.
Decide on a stable user identifier to scope sessions, often your email or a user ID. Use this for COMPOSIO_USER_ID.

Install dependencies

bash

pip install google-adk composio python-dotenv

Inside your virtual environment, install the required packages.

What's happening:

google-adk is Google's Agents Development Kit
composio connects your agent to Nextdns via MCP
python-dotenv loads environment variables

Set up ADK project

bash

adk create my_agent

Set up a new Google ADK project.

What's happening:

This creates an agent folder with a root agent file and .env file

Set environment variables

bash

GOOGLE_API_KEY=your-google-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id-or-email

Save all your credentials in the .env file.

What's happening:

GOOGLE_API_KEY authenticates with Google's Gemini models
COMPOSIO_API_KEY authenticates with Composio
COMPOSIO_USER_ID identifies the user for session management

Import modules and validate environment

python

import os
import warnings

from composio import Composio
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()

warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

What's happening:

os reads environment variables
Composio is the main Composio SDK client
GoogleProvider declares that you are using Google ADK as the agent runtime
Agent is the Google ADK LLM agent class
McpToolset lets the ADK agent call MCP tools over HTTP

Create Composio client and Tool Router session

python

composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["nextdns"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")

What's happening:

Authenticates to Composio with your API key
Declares Google ADK as the provider
Spins up a short-lived MCP endpoint for your user and selected toolkit
Stores the MCP HTTP URL for the ADK MCP integration

Set up the McpToolset and create the Agent

python

composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Nextdns operations."
    ),
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

What's happening:

Connects the ADK agent to the Composio MCP endpoint through McpToolset
Uses Gemini as the model powering the agent
Lists exact tool names in instruction to reduce misnamed tool calls

Run the agent

bash

# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web

Execute the agent from the project root. The web command opens a web portal where you can chat with the agent.

What's happening:

adk run runs the agent in CLI mode
adk web . opens a web UI for interactive testing

Complete Code

Here's the complete code to get you started with Nextdns and Google ADK:

python

import os
import warnings

from composio import Composio
from composio_google import GoogleProvider
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()
warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

composio_client = Composio(api_key=COMPOSIO_API_KEY, provider=GoogleProvider())

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["nextdns"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url


composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Nextdns operations."
    ),  
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

Conclusion

You've successfully integrated Nextdns with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Nextdns using natural language commands.

Key takeaways:

The Tool Router approach dynamically routes requests to the appropriate Nextdns tools
Environment variables keep your credentials secure and separate from code
Clear agent instructions reduce tool calling errors
The ADK web UI provides an interactive interface for testing and development

You can extend this setup by adding more toolkits to the toolkits array in your session configuration.

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

Use Nextdns MCP with OpenAI Agents SDK

Claude Agent SDK

Use Nextdns MCP with Claude Agent SDK

Claude Code

Use Nextdns MCP with Claude Code

Claude Cowork

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Codex

Use Nextdns MCP with Codex

OpenClaw

Use Nextdns MCP with OpenClaw

Hermes

Use Nextdns MCP with Hermes

CLI

Use Nextdns MCP with CLI

LangChain

Use Nextdns MCP with LangChain

Vercel AI SDK

Use Nextdns MCP with Vercel AI SDK

Mastra AI

Use Nextdns MCP with Mastra AI

LlamaIndex

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CrewAI

Use Nextdns MCP with CrewAI

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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. Google ADK 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 FREE BOOK A DEMO

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

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

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

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

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

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

Co-Founder, Ingram Technologies

How to integrate Nextdns MCP with Google ADK

Connect Nextdns without auth hassles

Introduction

Also integrate Nextdns with

TL;DR

What is Google ADK?

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

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

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for Google and Composio

Install dependencies

Set up ADK project

Set environment variables

Import modules and validate environment

Create Composio client and Tool Router session

Set up the McpToolset and create the Agent

Run the agent

Complete Code

Conclusion

Supported Tools

How to build Nextdns MCP Agent with another framework

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

OpenClaw

Hermes

CLI

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Explore Other Toolkits

Excel

21risk

Abstract

Addressfinder

Frequently asked questions

What are the differences in Tool Router MCP and Nextdns MCP?+

Can I use Tool Router MCP with Google ADK?+

Can I manage the permissions and scopes for Nextdns while using Tool Router?+

How safe is my data with Composio Tool Router?+

Start with Nextdns.It takes 30 seconds.

Teams ship real agents on Composio