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GitHub - nacos-group/nacos-mcp-router

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

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.

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

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

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

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

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.
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.
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.

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

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

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/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/nacos-mcp-router:latest"
      ]
    }
  }
}

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

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/nacos-mcp-router:latest

Environment Variable Settings Parameter Description Default Value Required Remarks NACOS_ADDR Nacos server address 127.0.0.1:8848 No the Nacos server address, e.g., 192.168.1.1:8848. Note: Include the port. NACOS_USERNAME Nacos username nacos No the Nacos username, e.g., nacos. NACOS_PASSWORD Nacos password - Yes the Nacos password, e.g., nacos. COMPASS_API_BASE COMPASS API endpoint for enhanced search https://registry.mcphub.io No Override the default COMPASS API endpoint SEARCH_MIN_SIMILARITY Minimum similarity score (0.0-1.0) 0.5 No Filter search results by minimum similarity score SEARCH_RESULT_LIMIT Maximum number of results to return 10 No Limit the number of search results NACOS_NAMESPACE Nacos Namespace public No Nacos namespace, e.g. public TRANSPORT_TYPE Transport protocol type stdio No transport protocol type. Options: stdio, sse, streamable_http. PROXIED_MCP_NAME Proxied MCP server name - No In proxy mode, specify the MCP server name to be converted. Must be registered in Nacos first. MODE Working mode router No Available options: router, proxy. PORT Service port when TRANSPORT_TYPE is sse or streamable_http 8000 No ACCESS_KEY_ID Aliyun ram access key id - No ACCESS_KEY_SECRET Aliyun ram access key secret - No 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"
      }
    }
  }
}

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.

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