How to integrate Nextdns MCP with Autogen

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Introduction

This guide walks you through connecting Nextdns to AutoGen 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 AutoGen 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 required dependencies for Autogen and Composio
  • Initialize Composio and create a Tool Router session for Nextdns
  • Wire that MCP URL into Autogen using McpWorkbench and StreamableHttpServerParams
  • Configure an Autogen AssistantAgent that can call Nextdns tools
  • Run a live chat loop where you ask the agent to perform Nextdns operations

What is AutoGen?

Autogen is a framework for building multi-agent conversational AI systems from Microsoft. It enables you to create agents that can collaborate, use tools, and maintain complex workflows.

Key features include:

  • Multi-Agent Systems: Build collaborative agent workflows
  • MCP Workbench: Native support for Model Context Protocol tools
  • Streaming HTTP: Connect to external services through streamable HTTP
  • AssistantAgent: Pre-built agent class for tool-using assistants

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

You will need:

  • A Composio API key
  • An OpenAI API key (used by Autogen's OpenAIChatCompletionClient)
  • A Nextdns account you can connect to Composio
  • Some basic familiarity with Autogen and Python async

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
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.

Install dependencies

bash
pip install composio python-dotenv
pip install autogen-agentchat autogen-ext-openai autogen-ext-tools

Install Composio, Autogen extensions, and dotenv.

What's happening:

  • composio connects your agent to Nextdns via MCP
  • autogen-agentchat provides the AssistantAgent class
  • autogen-ext-openai provides the OpenAI model client
  • autogen-ext-tools provides MCP workbench support

Set up environment variables

bash
COMPOSIO_API_KEY=your-composio-api-key
OPENAI_API_KEY=your-openai-api-key
USER_ID=your-user-identifier@example.com

Create a .env file in your project folder.

What's happening:

  • COMPOSIO_API_KEY is required to talk to Composio
  • OPENAI_API_KEY is used by Autogen's OpenAI client
  • USER_ID is how Composio identifies which user's Nextdns connections to use

Import dependencies and create Tool Router session

python
import asyncio
import os
from dotenv import load_dotenv
from composio import Composio

from autogen_agentchat.agents import AssistantAgent
from autogen_ext.models.openai import OpenAIChatCompletionClient
from autogen_ext.tools.mcp import McpWorkbench, StreamableHttpServerParams

load_dotenv()

async def main():
    # Initialize Composio and create a Nextdns session
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))
    session = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["nextdns"]
    )
    url = session.mcp.url
What's happening:
  • load_dotenv() reads your .env file
  • Composio(api_key=...) initializes the SDK
  • create(...) creates a Tool Router session that exposes Nextdns tools
  • session.mcp.url is the MCP endpoint that Autogen will connect to

Configure MCP parameters for Autogen

python
# Configure MCP server parameters for Streamable HTTP
server_params = StreamableHttpServerParams(
    url=url,
    timeout=30.0,
    sse_read_timeout=300.0,
    terminate_on_close=True,
    headers={"x-api-key": os.getenv("COMPOSIO_API_KEY")}
)

Autogen expects parameters describing how to talk to the MCP server. That is what StreamableHttpServerParams is for.

What's happening:

  • url points to the Tool Router MCP endpoint from Composio
  • timeout is the HTTP timeout for requests
  • sse_read_timeout controls how long to wait when streaming responses
  • terminate_on_close=True cleans up the MCP server process when the workbench is closed

Create the model client and agent

python
# Create model client
model_client = OpenAIChatCompletionClient(
    model="gpt-5",
    api_key=os.getenv("OPENAI_API_KEY")
)

# Use McpWorkbench as context manager
async with McpWorkbench(server_params) as workbench:
    # Create Nextdns assistant agent with MCP tools
    agent = AssistantAgent(
        name="nextdns_assistant",
        description="An AI assistant that helps with Nextdns operations.",
        model_client=model_client,
        workbench=workbench,
        model_client_stream=True,
        max_tool_iterations=10
    )

What's happening:

  • OpenAIChatCompletionClient wraps the OpenAI model for Autogen
  • McpWorkbench connects the agent to the MCP tools
  • AssistantAgent is configured with the Nextdns tools from the workbench

Run the interactive chat loop

python
print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
print("Ask any Nextdns related question or task to the agent.\n")

# Conversation loop
while True:
    user_input = input("You: ").strip()

    if user_input.lower() in ["exit", "quit", "bye"]:
        print("\nGoodbye!")
        break

    if not user_input:
        continue

    print("\nAgent is thinking...\n")

    # Run the agent with streaming
    try:
        response_text = ""
        async for message in agent.run_stream(task=user_input):
            if hasattr(message, "content") and message.content:
                response_text = message.content

        # Print the final response
        if response_text:
            print(f"Agent: {response_text}\n")
        else:
            print("Agent: I encountered an issue processing your request.\n")

    except Exception as e:
        print(f"Agent: Sorry, I encountered an error: {str(e)}\n")
What's happening:
  • The script prompts you in a loop with You:
  • Autogen passes your input to the model, which decides which Nextdns tools to call via MCP
  • agent.run_stream(...) yields streaming messages as the agent thinks and calls tools
  • Typing exit, quit, or bye ends the loop

Complete Code

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

python
import asyncio
import os
from dotenv import load_dotenv
from composio import Composio

from autogen_agentchat.agents import AssistantAgent
from autogen_ext.models.openai import OpenAIChatCompletionClient
from autogen_ext.tools.mcp import McpWorkbench, StreamableHttpServerParams

load_dotenv()

async def main():
    # Initialize Composio and create a Nextdns session
    composio = Composio(api_key=os.getenv("COMPOSIO_API_KEY"))
    session = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["nextdns"]
    )
    url = session.mcp.url

    # Configure MCP server parameters for Streamable HTTP
    server_params = StreamableHttpServerParams(
        url=url,
        timeout=30.0,
        sse_read_timeout=300.0,
        terminate_on_close=True,
        headers={"x-api-key": os.getenv("COMPOSIO_API_KEY")}
    )

    # Create model client
    model_client = OpenAIChatCompletionClient(
        model="gpt-5",
        api_key=os.getenv("OPENAI_API_KEY")
    )

    # Use McpWorkbench as context manager
    async with McpWorkbench(server_params) as workbench:
        # Create Nextdns assistant agent with MCP tools
        agent = AssistantAgent(
            name="nextdns_assistant",
            description="An AI assistant that helps with Nextdns operations.",
            model_client=model_client,
            workbench=workbench,
            model_client_stream=True,
            max_tool_iterations=10
        )

        print("Chat started! Type 'exit' or 'quit' to end the conversation.\n")
        print("Ask any Nextdns related question or task to the agent.\n")

        # Conversation loop
        while True:
            user_input = input("You: ").strip()

            if user_input.lower() in ['exit', 'quit', 'bye']:
                print("\nGoodbye!")
                break

            if not user_input:
                continue

            print("\nAgent is thinking...\n")

            # Run the agent with streaming
            try:
                response_text = ""
                async for message in agent.run_stream(task=user_input):
                    if hasattr(message, 'content') and message.content:
                        response_text = message.content

                # Print the final response
                if response_text:
                    print(f"Agent: {response_text}\n")
                else:
                    print("Agent: I encountered an issue processing your request.\n")

            except Exception as e:
                print(f"Agent: Sorry, I encountered an error: {str(e)}\n")

if __name__ == "__main__":
    asyncio.run(main())

Conclusion

You now have an Autogen assistant wired into Nextdns through Composio's Tool Router and MCP. From here you can:
  • Add more toolkits to the toolkits list, for example notion or hubspot
  • Refine the agent description to point it at specific workflows
  • Wrap this script behind a UI, Slack bot, or internal tool
Once the pattern is clear for Nextdns, you can reuse the same structure for other MCP-enabled apps with minimal code changes.

How to build Nextdns MCP Agent with another framework

OpenAI Agents SDK

OpenAI Agents SDK

Use Nextdns MCP with OpenAI Agents SDK

Claude Agent SDK

Claude Agent SDK

Use Nextdns MCP with Claude Agent SDK

Google ADK

Google ADK

Use Nextdns MCP with Google ADK

LangChain

LangChain

Use Nextdns MCP with LangChain

Vercel AI SDK

Vercel AI SDK

Use Nextdns MCP with Vercel AI SDK

Mastra AI

Mastra AI

Use Nextdns MCP with Mastra AI

LlamaIndex

LlamaIndex

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 Autogen?

Yes, you can. Autogen 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.

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