Nextdns

A Model Context Protocol (MCP) server for the NextDNS API, built with FastMCP and generated from OpenAPI specifications.

Overview

This project provides an MCP server that exposes NextDNS API operations as tools that can be used by AI assistants and other MCP clients. The server is automatically generated from a comprehensive OpenAPI specification using the FastMCP library.

Features

• 70+ NextDNS operations exposed as MCP tools
• Profile Management: Full CRUD operations - create, read, update, and delete profiles
• Profile Access Control: Fine-grained read/write restrictions per profile, with read-only mode support
• DNS-over-HTTPS Testing: Perform DoH lookups to test DNS resolution through profiles
• Settings Configuration: Comprehensive settings management including logs, block page, and performance
• Logs: Query log retrieval and clearing
• Analytics: Comprehensive DNS query analytics and statistics (11 endpoints)
• Content Lists: Manage denylist, allowlist, and parental control
• Security: Complete security settings and TLD blocking configuration
• Privacy: Privacy settings, blocklists, and native tracking protection management
• Parental Control: Settings management with safe search and YouTube restrictions
• OpenAPI-Generated: Server automatically generated from nextdns-openapi.yaml
• Docker MCP Gateway: Full integration with Docker's MCP Gateway for secure, isolated deployment
• Docker Support: Containerized deployment with proper OCI labels
• Safety Mechanisms: Write operation protections and validation

Documentation

Complete documentation can be found in docs/index.md.

Quick Start

Prerequisites

• Python 3.12+
• uv (for development)
• Docker (for containerized deployment)
• NextDNS API key (get one here)

Configuration

1. Copy the .env.example file to .env:

   cp .env.example .env
   

2. Edit .env and set your NextDNS API key:

   NEXTDNS_API_KEY=your_api_key_here
   NEXTDNS_DEFAULT_PROFILE=your_profile_id  # Optional
   NEXTDNS_TEST_PROFILE=test_profile_id     # For write operation tests
   
   # Optional: Profile access control (see Profile Access Control section)
   # NEXTDNS_READABLE_PROFILES=profile1,profile2
   # NEXTDNS_WRITABLE_PROFILES=test_profile
   # NEXTDNS_READ_ONLY=false
   

Running with Docker

1. Build the Docker image:

   docker build -t nextdns-mcp:latest .
   

2. Run the container with environment variables:

   Option A: Direct environment variables (simple)

   docker run -i --rm \
     -e NEXTDNS_API_KEY=your_api_key_here \
     -e NEXTDNS_DEFAULT_PROFILE=your_profile_id \
     nextdns-mcp:latest
   

   Option B: Docker secrets (recommended for production)

   # Create secret
   echo "your_api_key_here" | docker secret create nextdns_api_key -
   
   # Run with Docker Swarm
   docker service create \
     --name nextdns-mcp \
     --secret nextdns_api_key \
     -e NEXTDNS_API_KEY_FILE=/run/secrets/nextdns_api_key \
     nextdns-mcp:latest
   

   Or for non-swarm (using mounted file):

   # Create a secret file
   echo "your_api_key_here" > /tmp/api_key.txt
   chmod 600 /tmp/api_key.txt
   
   # Run with mounted secret
   docker run -i --rm \
     -v /tmp/api_key.txt:/run/secrets/nextdns_api_key:ro \
     -e NEXTDNS_API_KEY_FILE=/run/secrets/nextdns_api_key \
     nextdns-mcp:latest
   

   Option C: Environment file (development)

   docker run -i --rm \
     --env-file .env \
     nextdns-mcp:latest
   

   Note: MCP servers use stdio (standard input/output) for communication, not HTTP ports.

Running Locally (Development)

1. Install dependencies:

   uv sync
   

2. Run the server:

   uv run python -m nextdns_mcp.server
   

Architecture

This server uses a modern, declarative approach:

1. OpenAPI Specification (nextdns-openapi.yaml): Complete NextDNS API documentation
2. FastMCP Generation: Server automatically generated using FastMCP.from_openapi()
3. HTTP Client: Authenticated httpx.AsyncClient for NextDNS API calls
4. MCP Protocol: Tools, resources, and prompts exposed via Model Context Protocol

Key Components

• src/nextdns_mcp/nextdns-openapi.yaml: OpenAPI 3.0 specification for NextDNS API
• src/nextdns_mcp/server.py: FastMCP server implementation
• catalog.yaml: Docker MCP Gateway catalog entry with server metadata
• Dockerfile: Container definition with OCI labels for MCP Gateway
• AGENT.md: Development guidelines and safety rules

Docker Tags

This project publishes official Docker images with a standardized tagging policy:

• :latest: Floating tag that tracks the most recent successful build from the main branch. This tag is rebuilt on changes to main and via scheduled rebuilds.
• :<major>: Floating tag for the most recent build in a given major series (e.g., :2). This tag is updated whenever a new image for that major line is published and may include unreleased changes if the corresponding build comes from a branch head.
• :<major>.<minor>: Floating tag for the most recent build in a given minor series (e.g., :2.0). Like :<major>, it is updated when new images are built for that series and may include unreleased changes.
• :<major>.<minor>.<patch>: Tags for specific application releases (e.g., :2.0.3). These are intended to be immutable once published via the release workflow.

All floating tags (:latest, :<major>, :<major>.<minor>) are rebuilt regularly to include the latest OS security updates and any application changes present in the source commit used for that build. Consumers who require strict version pinning should use the full :<major>.<minor>.<patch> tags.

License

This project is released under the MIT License.

Contributing

1. See AGENT.md for guidelines and architecture
2. Note that NextDNS does not provide an OpenAPI specification. This is based on their documentation and may not reflect the current state of the API.