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charettep
by charettep

Ubuntu Desktop Control MCP Server

An MCP (Model Context Protocol) server that enables LLMs to control your Ubuntu desktop by taking screenshots and sending mouse clicks. This allows AI assistants to visually interact with your desktop applications.

⚔ NEW: Optimized Production Workflow

5x faster, 5x more accurate! Now using the same optimization techniques as Anthropic's Computer Use API:

  • šŸ“ø Smart Screenshots: Auto-downsampled to 1280x720 (5x smaller)

  • šŸŽÆ Numbered Elements: See what's clickable at a glance with overlaid IDs

  • šŸ¤– AT-SPI Integration: Automatic UI element detection using accessibility API

  • šŸ“ Percentage Coords: Resolution-agnostic positioning (no more pixel hunting!)

  • ⚔ Workflow Batching: Execute multiple actions in one MCP call

  • šŸŽŖ Element Cache: Direct element interaction - "click element #5"

Example - Old way (8+ calls, ~15s):

take_screenshot() → analyze → grid overlay → zoom quadrant → find pixel → click → miss

Example - New way (1 call, ~3s):

take_screenshot() → "I see Pinta is element #5" → click_screen(element_id=5) → āœ“

See README.md for full details.

Features

  • šŸ“ø Screenshot Capture: Annotated screenshots with automatic element detection

  • šŸ”¢ Element Detection: AT-SPI + CV fallback for robust UI element identification

  • šŸ–±ļø Smart Clicking: Click by element ID or percentage coordinates

  • āŒØļø Keyboard Control: Type text and press keys/hotkeys

  • šŸŽÆ Mouse Movement: Smooth cursor positioning with animation

  • šŸš€ Workflow Batching: Execute multi-step tasks in single MCP call

  • šŸ“Š Diagnostics: Display scaling detection, warnings, and recommendations

Quick Start

1. Prerequisites

  • Ubuntu Linux (X11 required, Wayland not fully supported)

  • Python 3.9+

2. Installation

pip install ubuntu-desktop-control

From Source

# Clone repository git clone https://github.com/charettep/ubuntu-desktop-control-mcp.git cd ubuntu-desktop-control-mcp # Install system dependencies (requires sudo) chmod +x scripts/install.sh ./scripts/install.sh # Install Python dependencies pip install -e .

Configuration

Claude Code

claude mcp add --transport stdio ubuntu-desktop-control -- \ ubuntu-desktop-control

Method 2: Manual Config

Edit ~/.claude/claude_desktop_config.json:

{ "mcpServers": { "ubuntu-desktop-control": { "command": "ubuntu-desktop-control", "args": [] } } }

VS Code Insiders

Method 1: MCP Command

  1. Open Command Palette (Ctrl+Shift+P)

  2. Run MCP: Open Workspace Folder Configuration

  3. Add the server configuration below.

Method 2: Manual Config

Create .vscode/mcp.json in your workspace:

{ "servers": { "ubuntu-desktop-control": { "type": "stdio", "command": "ubuntu-desktop-control", "args": [] } } }

Codex CLI

Method 1: CLI

codex mcp add ubuntu-desktop-control -- \ ubuntu-desktop-control

Method 2: Manual Config

Edit ~/.config/codex/config.toml:

[mcp_servers.ubuntu-desktop-control] type = "stdio" command = "ubuntu-desktop-control" args = []

Tools

Core Capabilities

Tool

Description

take_screenshot

Capture the desktop (optionally per-monitor) with annotated elements.

click_screen

Click by element ID or percentage coordinates (supports per-monitor).

move_mouse

Move the cursor by element ID or percentage coordinates (supports per-monitor).

drag_mouse

Drag the cursor to coordinates while holding a mouse button.

type_text

Type text using the keyboard.

press_key

Press a specific key (e.g., 'enter', 'esc').

press_hotkey

Press a combination of keys simultaneously (e.g., Ctrl+Shift+C).

get_screen_info

Get screen dimensions and display server type (X11/Wayland).

get_display_diagnostics

Troubleshoot scaling and coordinate mismatches.

map_GUI_elements_location

Detect and map UI elements (hitboxes) using Computer Vision.

convert_screenshot_coordinates

Convert pixels from a screenshot to logical click coordinates.

list_prompt_templates

List available prompt templates (for clients without native prompt support).

execute_workflow

Execute a batch of actions (screenshot/click/move/type/wait).

Prompt Rendering Tools

These tools allow clients without native prompt support (like Codex CLI) to render prompt templates as text.

Tool

Description

render_prompt_baseline_display_check

Render the baseline display check prompt.

render_prompt_capture_full_desktop

Render the full desktop capture prompt.

render_prompt_capture_region_for_task

Render the region capture prompt.

render_prompt_convert_screenshot_coordinates

Render the coordinate conversion prompt.

render_prompt_safe_click

Render the safe click prompt.

render_prompt_hover_and_capture

Render the hover and capture prompt.

render_prompt_coordinate_mismatch_recovery

Render the mismatch recovery prompt.

render_prompt_end_to_end_capture_and_act

Render the end-to-end workflow prompt.

Prompts

Prompt

Description

baseline_display_check

Check display settings and scaling before starting tasks.

capture_full_desktop

Capture and summarize the full desktop state.

capture_region_for_task

Capture a specific region for detailed inspection.

safe_click

Perform a click with safety checks and scaling awareness.

hover_and_capture

Hover to reveal UI elements, then capture.

coordinate_mismatch_recovery

Diagnose and fix missed clicks.

end_to_end_capture_and_act

Plan and execute a full interaction loop.

Configuration & Customization

Environment Variables

The server relies on standard Linux/X11 environment variables to locate and interact with the desktop session.

Variable

Description

Default

DISPLAY

X11 display identifier. Required for the server to know which screen to control.

:0

XDG_SESSION_TYPE

Used to detect if running on X11 or Wayland.

unknown

XAUTHORITY

Path to X11 authority file. Required if running from a different user context (e.g., sudo, docker) or over SSH.

~/.Xauthority

UDC_FORCE_COORDS

Force coordinate clicks (disable AT-SPI action clicks).

unset

Passing Environment Variables

You can customize these variables in your MCP client configuration.

Claude Desktop (claude_desktop_config.json)

{ "mcpServers": { "ubuntu-desktop-control": { "command": "ubuntu-desktop-control", "args": [], "env": { "DISPLAY": ":0", "XAUTHORITY": "/home/user/.Xauthority" } } } }

VS Code (.vscode/mcp.json)

{ "servers": { "ubuntu-desktop-control": { "command": "ubuntu-desktop-control", "args": [], "env": { "DISPLAY": ":0" } } } }

Display Scaling & Coordinates

If clicks land in the wrong place, you likely have a HiDPI display scaling mismatch (e.g., logical 1920x1080 vs physical 3840x2160).

Solutions:

  1. Auto-scale: Use click_screen(..., auto_scale=True) to let the server handle it.

  2. Diagnostics: Run get_display_diagnostics() to see the scaling factor.

  3. Element IDs: Use take_screenshot(detect_elements=True) and click via element_id or percentage coordinates.

Troubleshooting

  • "Screenshot failed": Ensure gnome-screenshot or scrot is installed (sudo apt install gnome-screenshot).

  • "PyAutoGUI not installed": Ensure you are using the .venv python.

  • Wayland Issues: This server requires X11. Check with echo $XDG_SESSION_TYPE. If "wayland", switch to "GNOME on Xorg" at login.

  • Permission Denied: Run xhost +local: if you have X11 permission issues.

Security

āš ļø Warning: This server gives LLMs full control over your mouse and visibility of your screen.

  • Only use with trusted clients.

  • Be aware screenshots may capture sensitive data.

  • Automated clicks can be destructive.

License

MIT License

-
security - not tested
A
license - permissive license
-
quality - not tested

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