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MCP Guardian

MCP Guardian

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mcp-guardian.orgSecurity202Updated 81w ago
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About MCP Guardian

MCP Guardian manages an LLM assistant's access to MCP servers, giving real-time control over its activity. It suits users who need to audit or approve MCP tool calls and switch between server configurations.

Key features

  1. 01Message logging of all MCP server activity
  2. 02Real-time approval or denial of tool calls
  3. 03Automated safety and privacy scans (coming soon)
  4. 04Quick switching between MCP server configuration sets

Use cases

  1. 01Auditing operations an LLM performs through MCP servers
  2. 02Manually approving individual tool calls before execution
  3. 03Switching server configurations across MCP host applications

MCP support

MCP Guardian sits between an LLM assistant and MCP servers, proxying and managing their access and centralizing server configuration for MCP host applications.

#mcp#llm-tools#claude-desktop#agentic-ai#model-context-protocol

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

No install method listed yet

We haven’t collected a package or remote endpoint for this server. Follow the instructions in the project README.

Repository

Tools

No tool list yet

Local servers expose tools only once running on your machine, and the maintainer has not provided a tool list.

Details

From the project README

MCP Guardian

mcp-guardian.org

Overview

MCP Guardian manages your LLM assistant's access to MCP servers, handing you realtime control of your LLM's activity.

📜 Message Logging - See traces for all of an LLM's MCP server activity

💂 Message Approvals - Approve and deny individual tool call messages in real time

🤖 Automated Message Scans - Realtime automated checks for safety, privacy, etc (Coming Soon)

README image

MCP Guardian also makes it a breeze to manage multiple MCP server configurations. Quickly switch between server collections without having to manually manage configuration files for your MCP host applications.

Development

This project uses nix to manage a development environment that can be used on Linux and macOS.

Quick Start - Linux / macOS

  1. Install nix

  2. Enable nix flakes

sudo sh -c 'echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf'
  1. Enter dev shell
nix develop
  1. Build project
just build-release
  1. mcp-guardian and mcp-guardian-proxy are now in _build/bin/ which is in PATH of the dev shell.
Quick Start - Windows

  1. Install git with symlink support (otherwise you will need to restore ./mcp-guardian/bindings before building).

  2. Install rustup.

  3. Install nodejs.

  4. Install yarn.

npm install --global yarn

  1. Install .dll dependencies. The easiest way to do this is to install Visual Studio and install the C++ development packages.

  2. Install just

cargo install just

  1. Enter repo root with git-bash (otherwise just won't work and you'll need to call cargo directly)

  2. Build project

just build-release
Justfile
Available recipes:
    build
    build-release
    clean
    do DIR +RECIPE
    do-all +RECIPE
    fmt
    fmt-check
    lint
    readme-check
    readme-update
    test

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New to MCP?

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An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.