How to integrate Nextdns MCP with OpenAI Agents SDK

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Introduction

This guide walks you through connecting Nextdns to the OpenAI Agents SDK 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 my devices, clear all dns logs for my home profile through natural language commands.

This guide will help you understand how to give your OpenAI Agents SDK 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.

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Install the necessary dependencies
  • Initialize Composio and create a Tool Router session for Nextdns
  • Configure an AI agent that can use Nextdns as a tool
  • Run a live chat session where you can ask the agent to perform Nextdns operations

What is open-ai-agents-sdk?

The OpenAI Agents SDK is a lightweight framework for building AI agents that can use tools and maintain conversation state. It provides a simple interface for creating agents with hosted MCP tool support.

Key features include:

  • Hosted MCP Tools: Connect to external services through hosted MCP endpoints
  • SQLite Sessions: Persist conversation history across interactions
  • Simple API: Clean interface with Agent, Runner, and tool configuration
  • Streaming Support: Real-time response streaming for interactive applications

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.

Supported Tools & Triggers

Tools
Add Blocked TLDTool to add a top-level domain to the security blocklist for a nextdns profile.
Add Denylist DomainTool to add a domain to the denylist of a nextdns profile.
Toggle Block PageTool to enable or disable block page for a configuration.
Clear LogsTool to clear dns logs for a nextdns profile.
Create ProfileThis tool allows users to create a new nextdns profile.
Delete NextDNS ConfigurationTool to delete a nextdns configuration profile.
Download LogsTool to download dns logs for a profile.
Get Analytics DevicesTool to retrieve analytics aggregated by devices.
Get Analytics DomainsTool to retrieve analytics data for domains within a specific profile.
Get Analytics IPsTool to retrieve analytics aggregated by client ip addresses.
Get Analytics IP VersionsTool to retrieve analytics grouped by ip version within a specific profile.
Get Analytics Query TypesTool to retrieve dns query counts broken down by query type.
Get Analytics ReasonsTool to retrieve dns query counts broken down by classification reason.
Get Analytics StatusTool to retrieve analytics status for a specific profile.
Get LogsTool to retrieve logs for a specific nextdns profile with optional filters.
Get Profile DetailsRetrieves the details of a specific nextdns profile.
Get Setup InfoTool to get setup information for a provided configuration (profile).
List ConfigurationsTool to list all configurations (profiles) available on the nextdns account.
List Denylist DomainsTool to list domains in the denylist for a profile.
List Security SettingsTool to list current security options for a nextdns configuration.
List SettingsTool to list settings for a nextdns profile.
Log Client IPsTool to enable or disable logging of client ips for a nextdns configuration.
Toggle Domain LoggingTool to enable or disable logging of domains for a nextdns profile.
NextDNS LoginTool to authenticate to the nextdns api.
Get Monthly QueriesTool to get the number of dns queries made in the current month for a profile.
Remove Blocked TLDTool to remove a top-level domain from the security blocklist for a nextdns profile.
Remove Denylist DomainTool to remove a domain from a profile's denylist.
Rename ConfigurationTool to rename a nextdns configuration (profile).
Set AI Threat DetectionTool to enable or disable ai threat detection for a nextdns configuration.
Toggle Cryptojacking ProtectionTool to enable or disable cryptojacking protection for a nextdns configuration.
Set CSAM BlockingTool to enable or disable blocking of child sexual abuse material domains for a nextdns profile.
Toggle DGA ProtectionTool to enable or disable dga (domain generation algorithm) protection for a nextdns configuration.
Set DNS Rebinding ProtectionTool to enable or disable dns rebinding protection for a nextdns configuration.
Set Homograph ProtectionTool to enable or disable homograph attack protection for a nextdns configuration.
Set Newly Registered DomainsTool to enable or disable blocking of newly registered domains for a nextdns profile.
Toggle Parked Domains BlockingTool to enable or disable blocking of parked domains for a nextdns configuration.
Set Safe BrowsingTool to enable or disable google safe browsing for a nextdns configuration.
Toggle Threat Intelligence FeedsTool to enable or disable real-time threat intelligence feeds for a nextdns configuration.
Toggle Typosquatting ProtectionTool to enable or disable typosquatting protection for a nextdns configuration.
Update linked IPTool to update the linked ip for a nextdns profile.
Update Performance SettingsTool to update performance settings of a nextdns profile.
Update Privacy SettingsTool to update privacy settings for a profile.
Update ProfileTool to update an existing profile.

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

What is Tool Router?

Composio's Tool Router 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 Tool Router

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

How the Tool Router works

The Tool Router 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

Prerequisites

Before starting, make sure you have:
  • Composio API Key and OpenAI API Key
  • Primary know-how of OpenAI Agents SDK
  • A live Nextdns project
  • Some knowledge of Python or Typescript

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key

Install dependencies

pip install composio_openai_agents openai-agents python-dotenv

Install the Composio SDK and the OpenAI Agents SDK.

Set up environment variables

bash
OPENAI_API_KEY=sk-...your-api-key
COMPOSIO_API_KEY=your-api-key
USER_ID=composio_user@gmail.com

Create a .env file and add your OpenAI and Composio API keys.

Import dependencies

import asyncio
import os
from dotenv import load_dotenv

from composio import Composio
from composio_openai_agents import OpenAIAgentsProvider
from agents import Agent, Runner, HostedMCPTool, SQLiteSession
What's happening:
  • You're importing all necessary libraries.
  • The Composio and OpenAIAgentsProvider classes are imported to connect your OpenAI agent to Composio tools like Nextdns.

Set up the Composio instance

load_dotenv()

api_key = os.getenv("COMPOSIO_API_KEY")
user_id = os.getenv("USER_ID")

if not api_key:
    raise RuntimeError("COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key")

# Initialize Composio
composio = Composio(api_key=api_key, provider=OpenAIAgentsProvider())
What's happening:
  • load_dotenv() loads your .env file so OPENAI_API_KEY and COMPOSIO_API_KEY are available as environment variables.
  • Creating a Composio instance using the API Key and OpenAIAgentsProvider class.

Create a Tool Router session

# Create a Nextdns Tool Router session
session = composio.create(
    user_id=user_id,
    toolkits=["nextdns"]
)

mcp_url = session.mcp.url

What is happening:

  • You give the Tool Router the user id and the toolkits you want available. Here, it is only nextdns.
  • The router checks the user's Nextdns connection and prepares the MCP endpoint.
  • The returned session.mcp.url is the MCP URL that your agent will use to access Nextdns.
  • This approach keeps things lightweight and lets the agent request Nextdns tools only when needed during the conversation.

Configure the agent

# Configure agent with MCP tool
agent = Agent(
    name="Assistant",
    model="gpt-5",
    instructions=(
        "You are a helpful assistant that can access Nextdns. "
        "Help users perform Nextdns operations through natural language."
    ),
    tools=[
        HostedMCPTool(
            tool_config={
                "type": "mcp",
                "server_label": "tool_router",
                "server_url": mcp_url,
                "headers": {"x-api-key": api_key},
                "require_approval": "never",
            }
        )
    ],
)
What's happening:
  • We're creating an Agent instance with a name, model (gpt-5), and clear instructions about its purpose.
  • The agent's instructions tell it that it can access Nextdns and help with queries, inserts, updates, authentication, and fetching database information.
  • The tools array includes a HostedMCPTool that connects to the MCP server URL we created earlier.
  • The headers dict includes the Composio API key for secure authentication with the MCP server.
  • require_approval: 'never' means the agent can execute Nextdns operations without asking for permission each time, making interactions smoother.

Start chat loop and handle conversation

print("\nComposio Tool Router session created.")

chat_session = SQLiteSession("conversation_openai_toolrouter")

print("\nChat started. Type your requests below.")
print("Commands: 'exit', 'quit', or 'q' to end\n")

async def main():
    try:
        result = await Runner.run(
            agent,
            "What can you help me with?",
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")
    except Exception as e:
        print(f"Error: {e}\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "q"}:
            print("Goodbye!")
            break

        result = await Runner.run(
            agent,
            user_input,
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")

asyncio.run(main())
What's happening:
  • The program prints a session URL that you visit to authorize Nextdns.
  • After authorization, the chat begins.
  • Each message you type is processed by the agent using Runner.run().
  • The responses are printed to the console, and conversations are saved locally using SQLite.
  • Typing exit, quit, or q cleanly ends the chat.

Complete Code

Here's the complete code to get you started with Nextdns and open-ai-agents-sdk:

import asyncio
import os
from dotenv import load_dotenv

from composio import Composio
from composio_openai_agents import OpenAIAgentsProvider
from agents import Agent, Runner, HostedMCPTool, SQLiteSession

load_dotenv()

api_key = os.getenv("COMPOSIO_API_KEY")
user_id = os.getenv("USER_ID")

if not api_key:
    raise RuntimeError("COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key")

# Initialize Composio
composio = Composio(api_key=api_key, provider=OpenAIAgentsProvider())

# Create Tool Router session
session = composio.create(
    user_id=user_id,
    toolkits=["nextdns"]
)
mcp_url = session.mcp.url

# Configure agent with MCP tool
agent = Agent(
    name="Assistant",
    model="gpt-5",
    instructions=(
        "You are a helpful assistant that can access Nextdns. "
        "Help users perform Nextdns operations through natural language."
    ),
    tools=[
        HostedMCPTool(
            tool_config={
                "type": "mcp",
                "server_label": "tool_router",
                "server_url": mcp_url,
                "headers": {"x-api-key": api_key},
                "require_approval": "never",
            }
        )
    ],
)

print("\nComposio Tool Router session created.")

chat_session = SQLiteSession("conversation_openai_toolrouter")

print("\nChat started. Type your requests below.")
print("Commands: 'exit', 'quit', or 'q' to end\n")

async def main():
    try:
        result = await Runner.run(
            agent,
            "What can you help me with?",
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")
    except Exception as e:
        print(f"Error: {e}\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "q"}:
            print("Goodbye!")
            break

        result = await Runner.run(
            agent,
            user_input,
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")

asyncio.run(main())

Conclusion

This was a starter code for integrating Nextdns MCP with OpenAI Agents SDK to build a functional AI agent that can interact with Nextdns.

Key features:

  • Hosted MCP tool integration through Composio's Tool Router
  • SQLite session persistence for conversation history
  • Simple async chat loop for interactive testing
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.

How to build Nextdns MCP Agent with another framework

Claude Agent SDK

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Google ADK

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LangChain

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Vercel AI SDK

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Mastra AI

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Use Nextdns MCP with Mastra AI

LlamaIndex

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Use Nextdns MCP with LlamaIndex

CrewAI

CrewAI

Use Nextdns MCP with CrewAI

FAQ

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

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.

Can I use Tool Router MCP with OpenAI Agents SDK?

Yes, you can. OpenAI Agents SDK 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.

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

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.

How safe is my data with Composio Tool Router?

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.

Used by agents from

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