What is Nacos Mcp Router

nacos-mcp-router is a Model Context Protocol (MCP) server that provides functionalities such as searching, installing, and proxying other MCP servers. It is built on the Nacos platform, which facilitates dynamic service discovery and configuration management.

Use cases

Use cases for nacos-mcp-router include managing multiple MCP servers in a microservices architecture, facilitating service discovery in cloud-native applications, and providing a proxy mechanism for seamless communication between different MCP servers.

How to use

To use nacos-mcp-router, you can install it via pip or run it using uv. After installation, you can execute it as a script. It provides tools like ‘search_mcp_server’ for finding MCP servers, ‘add_mcp_server’ for adding new servers, and ‘use_tool’ for proxying requests to target MCP servers.

Key features

Key features of nacos-mcp-router include the ability to search for MCP servers by task and keywords, add new MCP servers, and proxy requests to other MCP servers. It simplifies the management of cloud-native applications and microservices.

Where to use

nacos-mcp-router can be used in cloud-native applications, microservices architectures, and environments where dynamic service discovery and configuration management are required.

nacos-mcp-router: A MCP server that provides functionalities such as search, installation, proxy, and more.

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Overview

Nacos is an easy-to-use platform designed for dynamic service discovery and configuration and service management. It helps you to build cloud native applications and microservices platform easily.

This MCP(Model Context Protocol) Server provides tools to search, install, proxy other MCP servers, with advanced search capabilities including vector similarity search and multi-provider result aggregation.

Nacos-MCP-Router has two working modes:

Router mode: The default mode, which recommends, distributes, installs, and proxies the functions of other MCP Servers through the MCP Server, helping users more conveniently utilize MCP Server services.

Proxy mode: Specified by the environment variable MODE=proxy, it can convert SSE and stdio protocol MCP Servers into streamable HTTP protocol MCP Servers through simple configuration.

Search Features

Nacos-MCP-Router provides powerful search capabilities through multiple providers:

Search Providers

1. Nacos Provider

   • Searches MCP servers using Nacos service discovery
   • Supports keyword matching and vector similarity search
   • Integrated with the local Nacos instance

2. Compass Provider

   • Connects to a COMPASS API endpoint for enhanced search
   • Supports semantic search and relevance scoring
   • Configurable API endpoint (default: https://registry.mcphub.io)

Search Configuration

Configure search behavior using environment variables:

# YOUR COMPASS API endpoint (for Outer Provider called Compass Provider)
COMPASS_API_BASE=https://registry.mcphub.io

# Minimum similarity score for results (0.0 to 1.0)
SEARCH_MIN_SIMILARITY=0.5

# Maximum number of results to return
SEARCH_RESULT_LIMIT=10

Search API

The search functionality is available through the MCP interface:

// Search for MCP servers
const results = await searchMcpServer(
  "Find MCP servers for natural language processing",
  ["nlp", "language"]
);

Results include:

• Server name and description
• Provider information
• Relevance score
• Additional metadata

Quick Start

Python

router mode

Tools

1. search_mcp_server
   • Search MCP servers by task and keywords.
   • Input:
     • task_description(string): Task description
     • key_words(string): Keywords of task
   • Returns: list of MCP servers and instructions to complete the task.
2. add_mcp_server
   • Add a MCP server. If the MCP server is a stdio server, this tool will install it and establish connection to it. If the MCP server is a sse server, this tool will establish connection to it
   • Input:
     • mcp_server_name(string): The name of MCP server.
   • Returns: tool list of the MCP server and how to use these tools.
3. use_tool
   • This tool helps LLM to use the tool of some MCP server. It will proxy requests to the target MCP server.
   • Input:
     • mcp_server_name(string): The target MCP server name that LLM wants to call.
     • mcp_tool_name(string): The tool name of target MCP server that LLM wants to call.
     • params(map): The parameters of the MCP tool.
   • Returns: Result returned from the target MCP server.

Usage

Using uv (recommended)

When using uv no specific installation is needed. We will
use uvx to directly run nacos-mcp-router.

export NACOS_ADDR=127.0.0.1:8848
export NACOS_USERNAME=nacos
export NACOS_PASSWORD=$PASSWORD
uvx nacos-mcp-router@latest

Using PIP

Alternatively you can install nacos-mcp-router via pip:

pip install nacos-mcp-router

After installation, you can run it as a script using（As an example，Nacos is deployed in standalone mode on the local machine）:

export NACOS_ADDR=127.0.0.1:8848
export NACOS_USERNAME=nacos
export NACOS_PASSWORD=$PASSWORD
python -m nacos_mcp_router

Using Docker

docker run -i --rm --network host -e NACOS_ADDR=$NACOS_ADDR -e NACOS_USERNAME=$NACOS_USERNAME -e NACOS_PASSWORD=$NACOS_PASSWORD -e TRANSPORT_TYPE=$TRANSPORT_TYPE nacos-mcp-router:latest

Usage with Cline、Cursor、Claude and other applications

Add this to MCP settings of your application:

• Using uvx

{
  "mcpServers": {
    "nacos-mcp-router": {
      "command": "uvx",
      "args": [
        "nacos-mcp-router@latest"
      ],
      "env": {
        "NACOS_ADDR": "<NACOS-ADDR>, optional, default is 127.0.0.1:8848",
        "NACOS_USERNAME": "<NACOS-USERNAME>, optional, default is nacos",
        "NACOS_PASSWORD": "<NACOS-PASSWORD>, required"
      }
    }
  }
}

You may need to put the full path to the uvx executable in the command field. You can get this by running which uvx on MacOS/Linux or where uvx on Windows.

• Using docker

{
  "mcpServers": {
    "nacos-mcp-router": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "--network",
        "host",
        "-e",
        "NACOS_ADDR=<NACOS-ADDR>",
        "-e",
        "NACOS_USERNAME=<NACOS-USERNAME>",
        "-e",
        "NACOS_PASSWORD=<NACOS-PASSWORD>",
        "-e",
        "TRANSPORT_TYPE=stdio",
        "nacos-mcp-router:latest"
      ]
    }
  }
}

Proxy Mode

The proxy mode supports converting SSE and stdio protocol MCP Servers into streamable HTTP protocol MCP Servers.

Usage

The usage of proxy mode is similar to that of router mode, with slightly different parameters. Docker deployment is recommended.

docker run -i --rm --network host -e NACOS_ADDR=$NACOS_ADDR -e NACOS_USERNAME=$NACOS_USERNAME -e NACOS_PASSWORD=$NACOS_PASSWORD -e TRANSPORT_TYPE=streamable_http -e MODE=proxy -e PROXIED_MCP_NAME=$PROXIED_MCP_NAME  nacos-mcp-router:latest

Environment Variable Settings

typescript

Usage with Cline、Cursor、Claude and other applications

{
  "mcpServers": {
    "nacos-mcp-router": {
      "command": "npx",
      "args": [
        "nacos-mcp-router@latest"
      ],
      "env": {
        "NACOS_ADDR": "<NACOS-ADDR>, optional, default is 127.0.0.1:8848",
        "NACOS_USERNAME": "<NACOS-USERNAME>, optional, default is nacos",
        "NACOS_PASSWORD": "<NACOS-PASSWORD>, required"
      }
    }
  }
}

License

nacos-mcp-router is licensed under the Apache 2.0 License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the Apache 2.0 License. For more details, please see the LICENSE file in the project repository.