MCP Server

Saturn provides a Model Context Protocol (MCP) server that lets any MCP-aware host browse the Saturn LAN with no Saturn-specific code. It exposes tools for discovery, model enumeration, and chat completion.

What it does on the wire

When the host calls the discover_saturn_services tool, the server runs the equivalent of:

$ dns-sd -B _saturn._tcp .local
$ dns-sd -L "<instance>" _saturn._tcp local.

…and returns the results to the host as JSON. No host-side mDNS library required.

Install

pip install saturn-ai

The MCP server binary is saturn-mcp and communicates over stdio transport.

Setup

Claude Code

Add to .claude/mcp.json or project settings:

{
  "mcpServers": {
    "saturn": {
      "command": "saturn-mcp",
      "args": []
    }
  }
}

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "saturn": {
      "command": "saturn-mcp",
      "args": []
    }
  }
}

Claude Desktop

Edit your config file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "saturn": {
      "command": "saturn-mcp",
      "args": []
    }
  }
}

Available tools

Tool	Description
discover_saturn_services	Discover all Saturn services on the local network via mDNS
list_available_models	List all models available across Saturn services
find_service_for_model	Find the best service offering a specific model
find_service_with_capabilities	Find a service matching required capabilities
chat_completion	Send a chat completion request through a Saturn service
get_service_details	Get detailed info about a specific service

The saturn://services resource returns all discoverable services as JSON.

For full parameter details, see the MCP Tools Reference.

Example prompts

Once configured, you can ask your AI assistant:

• "What Saturn services are on my network?"
• "Find a service that supports vision"
• "Send a message to the ollama service asking it to explain quantum computing"
• "What models are available on the network?"