Use This MCP client To

Run multiple MCP servers concurrently with WebSocket communication Configure MCP server sets dynamically via JSON config files Integrate MCP stdio servers into WebSocket-based workflows Enable real-time bidirectional communication with MCP servers Use with kibitz for enhanced MCP client-server interactions

README

ws-mcp

Wrap MCP stdio servers with a WebSocket. For use with kibitz.

Quickstart

Prerequisites

Install uv:

curl -LsSf https://astral.sh/uv/install.sh | sh

Configuration

The config file specifies which MCP servers to run. The default config (no --config or --command args provided) includes:

wcgw: For general system operations and file management
fetch: For making HTTP requests

To make a configuration file:

Create your configuration file:
```
cp sample.config.json config.json
```
Modify config.json to add or remove servers based on your needs.
Run with --config path/to/config.json to use the new config file.

Running ws-mcp

Basic usage with default config file (no --config or --command provided) and port:

uvx --refresh ws-mcp@latest

This will start all configured servers on the default port (10125).

To use a config file and port:

uvx --refresh ws-mcp@latest --config path/to/config --port 10125

Detailed Usage

# Example using fetch
uvx --refresh ws-mcp --command "uvx mcp-server-fetch" --port 3002

# Example using wcgw
## On macOS
uvx --refresh ws-mcp --command "uvx --from wcgw@latest --python 3.12 wcgw_mcp" --port 3001

## On Linux (or if you have issues on macOS with wcgw)
cd /tmp
git clone https://github.com/nick1udwig/wcgw.git
cd wcgw
git submodule update --init --recursive
git checkout hf/fix-wcgw-on-ubuntu
cd ..
uvx --refresh ws-mcp --command "uvx --from /tmp/wcgw --with /tmp/wcgw/src/mcp_wcgw --python 3.12 wcgw_mcp" --port 3001

# Example using Brave search
export BRAVE_API_KEY=YOUR_API_KEY_HERE
uvx --refresh ws-mcp --env BRAVE_API_KEY=$BRAVE_API_KEY --command "npx -y @modelcontextprotocol/server-brave-search" --port 3003

# Or, with a .env file:
uvx --refresh ws-mcp --env-file path/to/.env --command "npx -y @modelcontextprotocol/server-brave-search" --port 3003

# `--command` can be supplied multiple times!
#  Example serving multiple servers at once:
uvx --refresh ws-mcp --env-file path/to/.env --command "npx -y @modelcontextprotocol/server-brave-search" --command "uvx mcp-server-fetch" --port 3004

# Servers can also be specified in a `.json` file following [the standard MCP format](https://modelcontextprotocol.io/quickstart/user#2-add-the-filesystem-mcp-server)
uvx --refresh ws-mcp --env-file path/to/.env --config path/to/config.json --port 3005

ws-mcp FAQ

How do I configure which MCP servers ws-mcp runs?

You create or modify a JSON config file specifying the MCP servers to run, then launch ws-mcp with the --config option pointing to that file.

What prerequisites are needed to run ws-mcp?

You need to install the uv runtime environment, which can be installed via the provided curl command.

Can ws-mcp run MCP servers other than the default ones?

Yes, you can customize the config file to add or remove MCP servers as needed.

How does ws-mcp communicate with MCP servers?

It wraps MCP stdio servers with a WebSocket interface, enabling real-time communication over WebSocket connections.

Is ws-mcp compatible with other MCP tools?

Yes, it is designed to work with tools like kibitz and can integrate with various MCP stdio servers.

How do I start ws-mcp with the default configuration?

Run the command without --config or --command arguments, and it will use the default config file and port.

What MCP servers are included by default in ws-mcp?

The default config includes wcgw for system operations and file management, and fetch for HTTP requests.

Can ws-mcp be used with multiple LLM providers?

While ws-mcp itself is a client wrapper, it supports MCP servers that can interact with LLMs like OpenAI, Claude, and Gemini.