mcpwrapped

A lightweight MCP (Model Context Protocol) proxy that sits between an MCP client and server. It allows you to filter available tools, preventing context window clutter by only exposing the tools you explicitly want to use.

Features

• Tool Filtering: Whitelist specific tools using the --visible_tools flag.
• Transparent Proxy: Forwards all other MCP protocol messages (resources, prompts, etc.) unchanged.
• Easy Integration: Works with any MCP client that supports command-based server configuration.

Installation

npm install -g mcpwrapped

Usage

mcpwrapped wraps your existing MCP server command. You pass the filtering flags first, followed by the actual command to run the server.

Basic Syntax

mcpwrapped --visible_tools=tool1,tool2 <actual_command> [actual_args...]

Example: Using with MCP Inspector

If you are using the @modelcontextprotocol/inspector to test a server, you can configure it to use mcpwrapped.

1. Create a config file (e.g., inspector-config.json):

{
  "mcpServers": {
    "my-wrapped-server": {
      "command": "mcpwrapped",
      "args": [
        "--visible_tools=calculate_sum,get_weather",
        "python",
        "-m",
        "my_mcp_server"
      ],
      "env": {
        "PYTHONPATH": "."
      }
    }
  }
}

2. Run the inspector:

npx @modelcontextprotocol/inspector --config ./inspector-config.json

Example: Claude Desktop Configuration

To use it with Claude Desktop, update your claude_desktop_config.json:

{
  "mcpServers": {
    "filesystem": {
      "command": "mcpwrapped",
      "args": [
        "--visible_tools=read_file",
        "npx",
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/Users/username/Desktop"
      ]
    }
  }
}

In this example, only the read_file tool from the filesystem server would be visible to Claude, hiding write_file, list_directory, etc.

Configuration Flags

Flag	Description	Example
<code>‑‑visible_tools</code>	Comma-separated list of tool names to expose. If omitted, all tools are hidden (or behavior depends on implementation, currently filters if flag is present).	<code>‑‑visible_tools=read_file,search</code>