1MCP - One MCP Server for All

A unified Model Context Protocol server implementation that aggregates multiple MCP servers into one.

Overview

1MCP (One MCP) is designed to simplify the way you work with AI assistants. Instead of configuring multiple MCP servers for different clients (Claude Desktop, Cherry Studio, Cursor, Roo Code, Claude, etc.), 1MCP provides a single, unified server that:

• Aggregates multiple MCP servers into one unified interface
• Reduces system resource usage by eliminating redundant server instances
• Simplifies configuration management across different AI assistants
• Provides a standardized way for AI models to interact with external tools and resources
• Supports dynamic configuration reloading without server restart
• Handles graceful shutdown and resource cleanup

Quick Start

To enable Cursor to use existing MCP servers already configured in Claude Desktop, follow these steps:

1. Run the 1MCP server with the Claude Desktop config file:

npx -y @1mcp/agent --config ~/Library/Application\ Support/Claude/claude_desktop_config.json

2. Add the 1MCP server to your Cursor config file (~/.cursor/mcp.json):

{
    "mcpServers": {
        "1mcp": {
            "type": "http",
            "url": "http://localhost:3050/sse"
        }
    }
}

3. Enjoy it!

Usage

You can run the server directly using npx:

# Basic usage (starts server with SSE transport)
npx -y @1mcp/agent

# Use existing Claude Desktop config
npx -y @1mcp/agent --config ~/Library/Application\ Support/Claude/claude_desktop_config.json

# Use stdio transport instead of SSE
npx -y @1mcp/agent --transport stdio

# Show all available options
npx -y @1mcp/agent --help

Available options:

• --transport, -t: Choose transport type ("stdio" or "sse", default: "sse")
• --config, -c: Use a specific config file
• --port, -P: Change SSE port (default: 3050)
• --host, -H: Change SSE host (default: localhost)
• --tags, -g: Filter servers by tags (see Tags section below)
• --help, -h: Show help

Understanding Tags

Tags help you control which MCP servers are available to different clients. Think of tags as labels that describe what each server can do.

How to Use Tags

1. In your server config: Add tags to each server to describe its capabilities

{
  "mcpServers": {
    "web-server": {
      "command": "uvx",
      "args": ["mcp-server-fetch"],
      "tags": ["network", "web"],
      "disabled": false
    },
    "file-server": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-filesystem", "~/Downloads"],
      "tags": ["filesystem"],
      "disabled": false
    }
  }
}

2. When starting 1MCP in stdio mode: You can filter servers by tags

# Only start servers with the "network" tag
npx -y @1mcp/agent --transport stdio --tags "network"

# Start servers with either "network" or "filesystem" tags
npx -y @1mcp/agent --transport stdio --tags "network,filesystem"

3. When using SSE transport: Clients can request servers with specific tags

{
    "mcpServers": {
        "1mcp": {
            "type": "http",
            "url": "http://localhost:3050/sse?tags=network"  // Only connect to network-capable servers
        }
    }
}

Example tags:

• network: For servers that make web requests
• filesystem: For servers that handle file operations
• memory: For servers that provide memory/storage
• shell: For servers that run shell commands
• db: For servers that handle database operations

Configuration

Global Configuration

The server automatically manages configuration in a global location:

• macOS/Linux: ~/.config/1mcp/mcp.json
• Windows: %APPDATA%/1mcp/mcp.json

Configuration File Format

{
  "mcpServers": {
    "mcp-server-fetch": {
      "command": "uvx",
      "args": [
        "mcp-server-fetch"
      ],
      "disabled": false
    },
    "server-memory": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-memory"
      ],
      "disabled": false
    }
  }
}

How It Works

System Architecture

graph TB
    subgraph "AI Assistants"
        A1[Claude Desktop]
        A2[Cursor]
        A3[Cherry Studio]
        A4[Roo Code]
    end

    subgraph "1MCP Server"
        MCP[1MCP Agent]
    end

    subgraph "MCP Servers"
        S1[Server 1]
        S2[Server 2]
        S3[Server 3]
    end

    A1 -->|sse| MCP
    A2 -->|sse| MCP
    A3 -->|sse| MCP
    A4 -->|sse| MCP

    MCP --> |sse| S1
    MCP --> |stdio| S2
    MCP --> |stdio| S3

Request Flow

sequenceDiagram
    participant Client as AI Assistant
    participant 1MCP as 1MCP Server
    participant MCP as MCP Servers

    Client->>1MCP: Send MCP Request
    activate 1MCP

    1MCP->>1MCP: Validate Request
    1MCP->>1MCP: Load Config
    1MCP->>MCP: Forward Request
    activate MCP

    MCP-->>1MCP: Response
    deactivate MCP

    1MCP-->>Client: Forward Response
    deactivate 1MCP

Development

Install dependencies:

pnpm install

Build the server:

pnpm build

For development with auto-rebuild:

pnpm watch

Run the server:

pnpm dev

Debugging

Using the MCP Inspector, which is available as a package script:

pnpm inspector

The Inspector will provide a URL to access debugging tools in your browser.