# Ubuntu/Debian
sudo apt install python3-pyatspi gir1.2-atspi-2.0 at-spi2-core

# For X11 input simulation
sudo apt install xdotool

# For Wayland input simulation (recommended)
# Install ydotool from source or your package manager
# Then start the daemon:
sudo ydotoold &

# From PyPI
pip install linux-desktop-mcp

# Or from source (this adapted repository)
git clone https://github.com/ShieldDog-ACE/Ubuntu_MCP.git
cd Ubuntu_MCP
pip install -e .

{
  "mcpServers": {
    "linux-desktop": {
      "command": "linux-desktop-mcp"
    }
  }
}

{
  "mcpServers": {
    "linux-desktop": {
      "command": "python",
      "args": ["-m", "linux_desktop_mcp"]
    }
  }
}

Parameters:
  app_name: str (optional) - Filter to specific application
  max_depth: int (default: 15) - Tree traversal depth

Returns:
  Tree of elements with ref_ids:
  - ref_1: [application] Firefox
    - ref_2: [frame] "GitHub - Mozilla Firefox"
      - ref_3: [button] "Back" (clickable)
      - ref_4: [entry] "Search or enter address" (editable, focused)

Parameters:
  query: str - "save button", "search field", "menu containing File"
  app_name: str (optional)

Returns:
  Matching elements with refs, states, and actions

Parameters:
  ref: str - Element reference (e.g., "ref_5")
  element: str - Human description for logging
  coordinate: [x, y] - Fallback if no ref
  button: left|right|middle
  click_type: single|double
  modifiers: [ctrl, shift, alt, super]

Parameters:
  text: str - Text to type
  ref: str - Element to focus first (optional)
  element: str - Human description
  clear_first: bool - Ctrl+A, Delete before typing
  submit: bool - Press Enter after

Parameters:
  key: str - Key name (Return, Tab, Escape, a, etc.)
  modifiers: [ctrl, shift, alt, super]

Parameters:
  command: str - 要执行的 bash 命令（最长 5000 字符）
  timeout: int (default: 30, max: 300) - 超时秒数

Returns:
  exit code + 合并后的 stdout/stderr（截断至 10000 字符）

Parameters:
  action: get|set - 读取或写入
  text: str - action=set 时要写入的文本

Returns:
  action=get 时返回当前剪贴板文本；action=set 时返回确认信息

Parameters:
  app: str - 应用名或 .desktop 文件名（如 "firefox"、"code"）

Returns:
  启动结果与进程信息

Parameters:
  title: str - 通知标题
  message: str - 通知正文
  urgency: low|normal|critical (optional) - 紧急程度

Returns:
  发送结果

User: "Open GitHub in Firefox"

Claude uses:
1. desktop_snapshot(app_name="Firefox")
   → Returns UI tree with elements like:
     - ref_5: [entry] "Search or enter address" (editable, focused)
     - ref_12: [button] "Go" (clickable)

2. desktop_click(ref="ref_5", element="URL bar")
   → Clicks to focus the address bar

3. desktop_type(text="https://github.com", ref="ref_5", clear_first=True, submit=True)
   → Types the URL and presses Enter

Result: Firefox navigates to GitHub

User: "Save this document as 'report.odt'"

Claude uses:
1. desktop_key(key="s", modifiers=["ctrl"])
   → Opens the Save dialog

2. desktop_snapshot(app_name="LibreOffice")
   → Returns dialog elements including:
     - ref_8: [entry] "File name:" (editable)
     - ref_15: [button] "Save" (clickable)

3. desktop_type(text="report.odt", ref="ref_8", clear_first=True)
   → Types the filename

4. desktop_click(ref="ref_15", element="Save button")
   → Clicks Save

Result: Document saved as report.odt

User: "Search for 'TODO' comments in VS Code"

Claude uses:
1. desktop_find(query="search", app_name="Code")
   → Finds search-related elements

2. desktop_key(key="f", modifiers=["ctrl", "shift"])
   → Opens global search panel

3. desktop_snapshot(app_name="Code")
   → Returns search panel elements:
     - ref_22: [entry] "Search" (editable, focused)
     - ref_25: [checkbox] "Match Case"

4. desktop_type(text="TODO", ref="ref_22", submit=True)
   → Types search query and executes search

Result: VS Code shows all TODO comments across the project

User: "Help me copy data from the spreadsheet to the email"

Claude uses:
1. desktop_context(list_available=True)
   → Lists all available windows

2. desktop_target_window(app_name="LibreOffice Calc", color="green")
   → Targets spreadsheet with green border

3. desktop_target_window(app_name="Thunderbird", color="blue")
   → Targets email client with blue border

4. desktop_snapshot()
   → Only shows elements from targeted windows (reduced context)

5. [Proceeds with copy/paste operations between windows]

Result: Claude can efficiently work across multiple applications

sudo apt install python3-pyatspi gir1.2-atspi-2.0 at-spi2-core

# Install and start ydotool daemon
sudo ydotoold &

┌─────────────────────────────────────────────────────────────┐
│                     MCP Protocol Layer                       │
│              (JSON-RPC over stdio, tool defs)                │
└─────────────────────────────────────────────────────────────┘
                              │
┌─────────────────────────────────────────────────────────────┐
│                  Reference Manager                           │
│          (ref_1, ref_2 mapping, lifecycle, GC)              │
└─────────────────────────────────────────────────────────────┘
                              │
          ┌───────────────────┴───────────────────┐
          │                                       │
┌─────────────────────┐             ┌─────────────────────────┐
│   AT-SPI2 Backend   │             │   Input Backends        │
│     (pyatspi)       │             │ (ydotool/xdotool/wtype) │
└─────────────────────┘             └─────────────────────────┘