Window Cap

A cross-platform window screenshot MCP server and library implemented in Rust, based on rmcp and xcap.

Features

• Get monitor count and details
• Capture screenshots of monitors and windows
• List and close windows
• Cross-platform support (Windows, macOS, Linux)
• Supports multiple transport modes (STDIO, SSE, HTTP)
• Available as Rust library and Python package

Installation

As MCP Server

# Build from source
make build
make run

As Python Package

pip install window-cap-mcp

As Rust Library

[dependencies]
window_cap_mcp_lib = "0.1"

Usage

MCP Server

# STDIO mode (for Claude Desktop)
window-cap-mcp

# SSE mode
window-cap-mcp --sse --port 3000

# HTTP mode
window-cap-mcp --http --port 8080

Python Library

import window_cap_mcp as wc

# Capture monitor screenshot
screenshot = wc.capture_monitor()

# Run as MCP server
wc.run_server()

Rust Library

use window_cap_mcp_lib::{Monitor, Window};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let monitors = Monitor::all()?;
    monitors[0].capture_image()?.save("screenshot.png")?;
    Ok(())
}

Claude Desktop Configuration

Edit the configuration file:

• Windows: %APPDATA%\Claude\claude_desktop_config.json
• macOS/Linux: ~/.config/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "window-cap": {
      "command": "window-cap-mcp"
    }
  }
}

MCP Tools

get_monitor_count

Get monitor information.

{
  "count": 2,
  "monitors": [
    {
      "index": 0,
      "name": "Display 1",
      "width": 1920,
      "height": 1080,
      "is_primary": true
    }
  ]
}

get_screen_screenshot

Capture monitor screenshot (Base64-encoded PNG).

Parameters: monitor_index (optional)

get_window_list

Get all windows information.

{
  "count": 5,
  "windows": [
    {
      "id": 12345,
      "title": "VS Code",
      "app_name": "Code.exe",
      "width": 1280,
      "height": 720
    }
  ]
}

get_window_screenshot

Capture window screenshot (Base64-encoded PNG).

Parameters: window_id (required)

close_window

Close a window by ID.

Parameters: window_id (required)

Development

make help          # View commands
make build         # Build project
make test          # Run tests
make clean         # Clean artifacts

License

MIT