mcp-guardian.org

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)

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.

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

1. Install nix

2. Enable nix flakes

sudo sh -c 'echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf'

3. Enter dev shell

nix develop

4. Build project

just build-release

5. mcp-guardian and mcp-guardian-proxy are now in _build/bin/ which is in PATH of the dev shell.

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

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

6. Install just

cargo install just

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

8. Build project

just build-release

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