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
• Includes comprehensive authentication and security features
• Supports advanced filtering, pagination, and request optimization

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

# Use external URL for reverse proxy setup (nginx, etc.)
npx -y @1mcp/agent --external-url https://example.com

# Configure trust proxy for reverse proxy setup
npx -y @1mcp/agent --trust-proxy=192.168.1.1

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

Available options:

Option (CLI)	Environment Variable	Description	Default
--transport, -t	ONE_MCP_TRANSPORT	Choose transport type ("stdio", "http", or "sse")	"http"
--config, -c	ONE_MCP_CONFIG	Use a specific config file
--port, -P	ONE_MCP_PORT	Change HTTP port	3050
--host, -H	ONE_MCP_HOST	Change HTTP host	localhost
--external-url, -u	ONE_MCP_EXTERNAL_URL	External URL for OAuth callbacks and public URLs (e.g., https://example.com)
--trust-proxy	ONE_MCP_TRUST_PROXY	Trust proxy configuration for client IP detection (boolean, IP, CIDR, preset)	"loopback"
--tags, -g	ONE_MCP_TAGS	Filter servers by tags
--pagination, -p	ONE_MCP_PAGINATION	Enable pagination for client/server lists (boolean)	false
--auth	ONE_MCP_AUTH	Enable authentication (OAuth 2.1) - Deprecated	false
--enable-auth	ONE_MCP_ENABLE_AUTH	Enable authentication (OAuth 2.1)	false
--enable-scope-validation	ONE_MCP_ENABLE_SCOPE_VALIDATION	Enable tag-based scope validation (boolean)	true
--enable-enhanced-security	ONE_MCP_ENABLE_ENHANCED_SECURITY	Enable enhanced security middleware (boolean)	false
--session-ttl	ONE_MCP_SESSION_TTL	Session expiry time in minutes (number)	1440
--session-storage-path	ONE_MCP_SESSION_STORAGE_PATH	Custom session storage directory path (string)
--rate-limit-window	ONE_MCP_RATE_LIMIT_WINDOW	OAuth rate limit window in minutes (number)	15
--rate-limit-max	ONE_MCP_RATE_LIMIT_MAX	Maximum requests per OAuth rate limit window (number)	100
--help, -h		Show help

Docker

You can also run 1MCP using Docker:

# Pull the latest image
docker pull ghcr.io/1mcp-app/agent:latest

# Run with HTTP transport (default)
docker run -p 3050:3050 ghcr.io/1mcp-app/agent

# Run with a custom config file
docker run -p 3050:3050 -v /path/to/config.json:/config.json ghcr.io/1mcp-app/agent --config /config.json

# Run with stdio transport
docker run -i ghcr.io/1mcp-app/agent --transport stdio

Available image tags:

• latest: Latest stable release
• vX.Y.Z: Specific version (e.g. v1.0.0)
• sha-<commit>: Specific commit

Examples:

# Custom port and tags
docker run -p 3051:3051 \
  -e ONE_MCP_PORT=3051 \
  -e ONE_MCP_TAGS=network,filesystem \
  ghcr.io/1mcp-app/agent

# With external URL for reverse proxy
docker run -p 3050:3050 \
  -e ONE_MCP_EXTERNAL_URL=https://mcp.example.com \
  -e ONE_MCP_TRUST_PROXY=true \
  ghcr.io/1mcp-app/agent

Trust Proxy Configuration

When running 1MCP behind a reverse proxy, configure trust proxy settings for proper client IP detection:

# Default (safe for local development)
npx -y @1mcp/agent --trust-proxy=loopback

# Behind reverse proxy
npx -y @1mcp/agent --trust-proxy=192.168.1.1

# Behind CDN/Cloudflare
npx -y @1mcp/agent --trust-proxy=true

See docs/TRUST_PROXY.md for detailed configuration options, security considerations, and reverse proxy setup examples.

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 -->|http| MCP
    A2 -->|http| MCP
    A3 -->|http| MCP
    A4 -->|http| MCP

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

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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

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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.

Debugging & Source Maps

This project uses source-map-support to enhance stack traces. When you run the server, stack traces will reference the original TypeScript source files instead of the compiled JavaScript. This makes debugging much easier, as error locations and line numbers will match your source code.

No extra setup is required—this is enabled by default. If you see a stack trace, it will point to .ts files and the correct line numbers. 🗺️